US20110005841A1 - Backup cutting elements on non-concentric reaming tools - Google Patents
Backup cutting elements on non-concentric reaming tools Download PDFInfo
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- US20110005841A1 US20110005841A1 US12/498,516 US49851609A US2011005841A1 US 20110005841 A1 US20110005841 A1 US 20110005841A1 US 49851609 A US49851609 A US 49851609A US 2011005841 A1 US2011005841 A1 US 2011005841A1
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- bit
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- center drill
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- 238000005553 drilling Methods 0.000 claims description 19
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- 230000002093 peripheral effect Effects 0.000 claims 1
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- 239000002245 particle Substances 0.000 description 4
- 239000010432 diamond Substances 0.000 description 3
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- 239000002131 composite material Substances 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/265—Bi-center drill bits, i.e. an integral bit and eccentric reamer used to simultaneously drill and underream the hole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
Definitions
- the present invention relates generally to enlarging the diameter of a subterranean borehole, and more specifically to enlarging the borehole below a portion thereof which remains at a lesser diameter.
- the method and apparatus of the present invention effects such enlargement using a bi-center bit.
- An eccentric bit includes a pilot section, above which (as the bit is oriented in the borehole) lies an eccentrically laterally extended or enlarged cutting portion which, when the bit is rotated about its axis, produces an enlarged borehole.
- An example of an eccentric bit is disclosed in U.S. Pat. Nos. 4,635,738 and 5,957,223.
- a bi-center bit assembly employs two longitudinally superimposed bit sections with laterally offset axes.
- the first axis is the center of the pass-through diameter, that is, the diameter of the smallest borehole the bit will pass through. This axis may be referred to as the pass-through axis.
- the second axis is the axis of the hole cut as the bit is rotated. This axis may be referred to as the drilling axis.
- Rotation of the bit remains centered about the drilling axis as the second, upper and larger radius, main, or reamer, bit section extending beyond the pilot bit section diameter to one side of the bit engages the formation to enlarge the borehole.
- the rotational axis of the bit assembly then rapidly transitions from the pass-through axis to the drilling axis when the full diameter or “gage” borehole is drilled.
- an extended bottomhole assembly extended bi-center assembly
- pilot bit at the distal end thereof and a reamer assembly some distance above.
- This arrangement permits the use of any standard bit type, be it a rock bit or a drag bit, as the pilot bit, and the extended nature of the assembly permits greater drillstring flexibility when passing through tight spots in the borehole as well as the opportunity to effectively stabilize the pilot bit so that the pilot hole and the following reamer will take the path intended for the borehole.
- the assignee of the present invention has designed as reaming structures so-called “reamer wings” which generally comprise a tubular body having a fishing neck with a threaded connection at the top thereof, and a tong die surface at the bottom thereof, also with a threaded connection.
- the upper mid-portion of the reamer wing includes one or more longitudinally extending blades projecting generally radially outwardly from the tubular body, the outer edges of the blades carrying superabrasive (also termed superhard) cutting elements, commonly termed PDCs (for Polycrystalline Diamond Compacts).
- the lower mid-portion of the reamer wing may include a stabilizing pad having an arcuate exterior surface the same or slightly smaller than the radius of the pilot hole on the exterior of the tubular body and longitudinally below the blades.
- the stabilizer pad is characteristically placed on the opposite side of the tubular body with respect to the reamer wing blades so that the reamer wing will ride on the pad due to the resultant force vector generated by the cutting of the blade or blades as the enlarged borehole is cut.
- U.S. Pat. No. 5,497,842 assigned to the assignee of the present invention and the disclosure of which is incorporated herein for all purposes by this reference, is exemplary of such reamer wing designs.
- One-piece bi-center bits are more compact, easier to handle for a given hole size, more suitable for directional drilling bottom-hole assemblies (particularly those drilling so-called “short” and “medium” radius non-linear borehole sections), and also less expensive to fabricate than reamer wing assemblies.
- Embodiments of the present invention are directed to a bi-center bit having backup cutters on the blades thereof.
- FIG. 1 comprises a perspective side view of a bi-center bit in accordance with an embodiment herein;
- FIG. 2 comprises a face view, or view looking up from the bottom of a borehole, of the cross-sectional configuration and cutter placement of the bit depicted in FIG. 1 .
- FIG. 3 is a perspective view of a blade having a cutter and a backup cutter located and oriented at substantially 90° from the cutter thereon;
- FIG. 4 is a perspective view of a blade having a cutter and a backup cutter located and oriented at substantially 90° from the cutter thereon;
- FIG. 5A is a view of a blade of a bi-center bit having a cutter and backup cutter thereon;
- FIG. 5B is a side view of a blade of a bi-center bit having a cutter and a backup cutter thereon;
- FIG. 5C is a cross-sectional view of a portion of a blade of a bi-center bit showing a backup cutter thereon;
- FIG. 5D is a top view of a portion of a blade of a bi-center bit illustrating a cutter having side rake
- FIG. 6A is a view of a cutter set comprising a cutter and multiple backup cutters
- FIG. 6B is a view of a cutter set comprising a cutter and multiple backup cutters
- FIG. 7A is a front view of the cutter set of FIG. 6A , showing cutting face overlap
- FIG. 7B is a view of the cutter set of FIG. 6B showing cutting face overlap
- FIG. 8 is a perspective view of a blade having a row of primary cutters cutters and multiple rows of backup cutters thereon for a bi-center bit;
- FIGS. 9 through 9G are each top views of inline cutter sets of an embodiment of the bi-center bit of the present invention.
- bi-center bit 100 includes a pilot bit section 112 comprising a plurality of blades 118 having superabrasive, preferably polycrystalline diamond compact (PDC) cutters 120 and backup PDC cutters 120 ′ mounted thereto.
- Fluid courses 122 extending between blades 118 carry drilling fluid laden with cuttings sheared by cutters 120 and 120 ′ of blades 118 drilling the pilot borehole into junk slots 124 , which extend longitudinally on gage 126 of the bi-center bit 100 between gage pads 128 .
- Gage pads 128 may be provided with a wear-resistant gage surface in the form of tungsten carbide bricks, natural diamonds, diamond-grit impregnated carbide, or a combination thereof, as known in the art.
- Drilling fluid is introduced into fluid courses 122 from ports 132 on the bit face 130 , which may comprise nozzles (see FIG. 2 ).
- Bi-center bit 100 also includes reamer bit section 114 comprising a plurality of blades 140 preferably having PDC cutters 120 and backup PDC cutters 120 ′ mounted thereto.
- blades 140 comprise any suitable number of blades based on the size of the bi-center bit 100 and may be located generally spaced about 90° from each other about the reamer bit section 114 .
- Ports 142 (which, again, may comprise nozzles, located intermediate blades 140 , feed drilling fluid into fluid courses 144 located in front of (in the direction of bit rotation) blades 140 , to carry away formation cuttings sheared by cutters 120 and 120 ′ of blades 140 when enlarging the pilot borehole to full gage diameter.
- Blades 140 include truncated gage pads 146 , which may also preferably include a wear-resistant surface of the types previously mentioned.
- One blade 140 includes an elongated gage pad 146 ′ thereon.
- Bit shank 150 having a threaded pin connection 152 , is used to connect bi-center bit 100 to a drill collar or to an output shaft of a downhole motor, as known in the art.
- pilot bit section 112 includes four blades 118 thereon, the cutters 120 and backup cutters 120 ′ have been placed and oriented thereon with the backup cutter 120 ′ located behind a cutter 120 on the same centerline on a blade 118 .
- the pockets for the backup cutters 120 ′ are located aft of the cutter pocket for the cutters 120 so that the backup cutters 120 ′ do not interfere with the cutters 120 .
- the backup cutters 120 ′ are underexposed by approximately 0.025 inch in diameter from the cutters 120 along the cutter profile for a blade 118 .
- Additional backup cutters may be located behind the backup cutters 120 ′ having any desired back rake angle therefor, to provide an indication when the bi-center bit 100 becomes under-gage by a desired amount, such as under-gage by 0.200 inch in diameter. If the backup cutters 120 ′ are positioned to have a 90° back rake angle, a backup cutter such as described in U.S. Pat. No.
- 6,408,958 may be used by being so oriented and located on a blade 118 / 140 approximately underexposed by 0.100 inch to provide a decrease in the rate of penetration of the bi-center bit 100 when contacting the formation being drilled. Such a reduction in the rate of penetration of the formation being drilled is an indicator that the bi-center bit 100 is under-gage with respect to the desired diameter of a borehole being formed.
- FIGS. 3 and 4 An arrangement of the above-described 90° backrake orientation of backup cutters 120 ′ on a blade 118 / 140 is illustrated in FIGS. 3 and 4 , wherein each backup cutter 120 ′ is located behind a cutter 120 on a blade 118 / 140 at an approximate 90° back rake angle.
- backup cutters 120 ′ are under exposed approximately 0.025 inch from the cutter 120 in front thereof and have approximately the same back rake angle as the cutter 120 located in front thereof, and the backup cutter 120 ′/ 120 ′′ aligns with the cutter 120 .
- a flat bottom milling tool cuts the drill bit body by plunging directly into the blade 118 / 140 and travels along the center line of the cutter 120 located in front thereof.
- the backup cutter pockets in the primary portion of the bit 100 are formed by casing the backup cutter pockets in the bit 100 as well as the pockets for other cutters for the bit 100 .
- Methods of manufacturing the bit 100 as a particle matrix composite bit are set forth in U.S. application Ser. No. 11/272,439, filed Nov. 10, 2005, entitled “Earth-Boring Rotary Drill Bits and Methods of Manufacturing Earth-Boring Bits Having Particle Matrix Composite Bit Bodies, the disclosure of which is incorporated herein in its entirety by reference.
- Ports 132 which preferably contain nozzles therein as known in the art, direct drilling fluid as shown by the arrows associated therewith, into fluid courses 122 of bit face 130 .
- passages within the bit body feed drilling fluid to ports 142 from a central passage or plenum, which also feeds ports 132 .
- Pilot bit gage diameter is defined by the gage cutters 120 ′/ 120 ′′ at the periphery of bit face 130 , and thus corresponds generally to (but is nominally larger than) a circle defined by connecting the radially outer pad surface of gage pads 128 (See FIG. 1 ).
- the backup cutters 120 ′/ 120 ′′ in the bit reamer section 114 are located in a manner similar to those of the bit face 130 on blades 118 and have the same or similar respective back rake angles.
- backup cutters 120 ′, 120 ′′ on the bi-center bit 100 provides an extended reamer blade profile and increased shoulder radius allowing the placement of additional cutters on a blade of the bi-center bit 100 , increasing the wear resistance of the bi-center bit 100 in the formation being drilled. Additionally, while the backup cutters 120 ′/ 120 ′′ have been located directly behind a cutter 120 , if desired, backup cutters 120 ′ may be somewhat laterally (with respect to the cutter path) offset therefrom while still following in the same kerf of the cutter 120 .
- FIG. 5A Illustrated in FIG. 5A is a partial view of a bi-center bit 100 showing the concept of cutter side rake (side rake) regarding cutters 120 , cutter placement (side-side) regarding backup cutters 120 ′, and cutter size (size).
- Side rake is the angle at which a cutter is oriented relative to its path of travel, a side rake of 0° being achieved when the cutting face of the cutter is facing normal to the path of cutter travel, illustration and further explanation being provided below with respect to FIG. 5D .
- “Side-side” is the amount of distance between cutters in adjacent cutter rows.
- Size is the cutter size, typically indicated by a cutter's diameter.
- FIG. 5B illustrates a partial side view of the bi-center bit 100 of FIG. 1 showing the concepts of back rake (also known as fore and aft rake) regarding cutters/backup cutters 120 / 120 ′, relative exposure of cutters 120 ′ with respect to cutters 120 , cutting edge chamfer regarding cutters 120 / 120 ′ and spacing between cutters 120 and backup cutters 120 ′.
- back rake also known as fore and aft rake
- FIG. 5C is a cross-sectional view through the center of a cutter/backup cutter 120 / 120 ′/ 120 ′′ positioned on a blade 118 / 140 of the bi-center bit 100 .
- the cutting direction, or direction of cutter travel due to bit rotation, is represented by the directional arrow 72 .
- the cutter/backup cutter 120 / 120 ′/ 120 ′′ may be mounted on the blades 118 / 140 in an orientation such that the cutting face of the cutter/backup cutter 120 / 120 ′/ 120 ′′ is oriented at a back rake angle 74 with respect to a line 80 .
- the line 80 may be defined as a line that extends radially outward from the face of the bi-center bit 100 in a direction substantially perpendicular thereto at that location. Additionally or alternatively, the line 80 may be defined as a line that extends radially outward from the face of the bi-center bit 100 in a direction substantially perpendicular to the cutting direction 72 .
- the back rake angle 74 may be measured relative to the line 80 , positive angles being measured in the counter clockwise direction, negative angles being measured in the clockwise direction.
- the effective back rake angle of a cutter rather than the physical back rake angle, is a function of cutter location from the bit centerline, and the rate of penetration of the bit during drilling.
- the cutter/backup cutter 120 / 120 ′/ 120 ′′ is shown in FIG. 5C having a negative back rake angle of approximately 20°, thus exhibiting a “back rake.”
- the cutter/backup cutter 120 / 120 ′/ 120 ′′ may have a positive back rake angle.
- the cutter/backup cutter 120 / 120 ′/ 120 ′′ may be said to have a “forward rake.”
- each cutter/backup cutter 120 / 120 ′/ 120 ′′ on the face of the bi-center bit 100 shown in FIG. 1 may, conventionally, have a back rake angle in a range extending from about negative 5° to about negative 30°.
- FIG. 5D is an enlarged partial top view of a cutter/backup cutter 120 / 120 ′/ 120 ′′ mounted on a blade 118 / 140 at the face of the bi-center bit 100 shown in FIG. 1 .
- the cutting direction is represented by the directional arrow 72 .
- the cutter/backup cutter 120 / 120 ′/ 120 ′′ may be mounted on the blade 118 / 140 in an orientation such that the cutting face of the cutter/backup cutter 120 / 120 ′/ 120 ′′ is oriented substantially perpendicular to the cutting direction 72 . In such a configuration, the cutter/backup cutter 120 / 120 ′/ 120 ′′ does not exhibit a side rake angle.
- the side rake angle of the cutter/backup cutter 120 / 120 ′/ 120 ′′ may be defined as the angle between a line 82 , which is oriented substantially perpendicular to the cutting direction 72 , and the cutting face of the cutter/backup cutter 120 / 120 ′/ 120 ′, positive angles being measured in the counter clockwise direction, negative angles being measured in the clockwise direction.
- the cutter/backup cutter 120 / 120 ′/ 120 ′′ may be mounted in the orientation represented by the dashed line 78 A. In this configuration, the cutter/backup cutter 120 / 120 ′/ 120 ′′ may have a negative side rake angle 76 A.
- each cutter/backup cutter 120 / 120 ′/ 120 ′′ on the face of the bi-center bit 100 shown in FIG. 1 may have a side rake angle in a range extending from approximately 10° to 60° or, in the alternative, approximately 5° to 75°, although if desired they may have a negative side rake angle of approximately the same range or greater.
- FIG. 6A Illustrated in FIG. 6A is a cutter set for a blade 118 / 140 wherein the cutter set is located about a centerline 200 on the blade 118 / 140 .
- the backup cutters 120 ′, 120 ′′ are located substantially within the same kerf as cutter 120 along centerline 200 while being laterally offset therefrom.
- FIG. 6B Illustrated in FIG. 6B is a cutter set for a blade 118 / 140 wherein the cutter set is located about a centerline 200 on the blade 118 / 140 .
- the backup cutters 120 ′, 120 ′′ are located within the same kerf as cutter 120 along centerline 200 having no offset therefrom.
- FIG. 7A is a face view of the cutter set of FIG. 6A located on a blade 118 / 140 wherein the backup cutters 120 ′, 120 ′′ follow the cutter 120 in the same kerf but are offset both vertically and axially along the centerline of the cutter 120 and have a smaller diameter than that of the cutter 120 and have a lesser exposure.
- FIG. 7B is the cutter set of FIG.
- backup cutters 120 ′/ 120 ′′ are located on the centerline of the cutter 120 in the same kerf but are vertically offset from the centerline and have a smaller diameter than that of the cutter 120 , backup cutter 120 ′ having a lesser exposure than cutter 120 , and backup cutter 120 ′′ having a lesser exposure than backup cutter 120 ′.
- the backup cutters 120 ′, 120 ′′ may be either the same size as cutter 120 ′ or smaller size than cutter 120 , as illustrated, if desired.
- FIG. 8 Illustrated in FIG. 8 is a blade 118 / 140 having cutters 120 thereon and multiple rows of backup cutters 120 ′, 120 ′′ thereon, as may be desired or required.
- FIG. 9 Illustrated in FIG. 9 is a first example of cutter/backup cutters 120 / 120 ′, 120 ′′ of the bi-center bit 100 in a top view representation of an inline cutter set 160 having two side raked backup cutters 120 ′, 120 ′′.
- the cutter 120 and the backup cutters 120 ′, 120 ′′ are spaced from each other any desired distance d.
- FIG. 9 illustrates a linear representation of a rotational or helical swath, or kerf or rotational path in which the inline cutter set 160 may be oriented upon a bi-center bit 100 ( FIG. 1 ).
- the inline cutter set 160 includes a cutter 120 and two side raked backup cutters 120 ′, 120 ′′.
- the side raked backup cutters 120 ′, 120 ′′ rotationally follow the cutter 120 , and each includes a side rake angle 155 which may be any desired side rake angle to the left of the rotational path, such as approximately 5° to approximately 75°.
- the side raked cutter 120 ′′ also includes a side rake angle to the right of the rotational path which is in the opposite direction to that of side rake cutter 120 ′, as illustrated. While two side raked cutters 120 ′, 120 ′′ are provided in the inline cutter set 160 , additional side raked cutters may be provided.
- While wear flats 156 , 157 may develop upon the cutter 120 as it wears, by introducing the side rake angle 155 the side raked cutter 120 ′, 120 ′′ cut parallel swaths or grooves or rotational paths with the apexes 158 , 159 , of side rake cutters 120 ′ and 120′′ directing the path of the cuttings generated by the bi-center bit 100 . Also, as the wear flats 156 , 157 grow upon the cutter 120 , the apexes 158 , 159 of backup cutters 120 ′, 120 ′′ are able to more effectively fracture and remove formation material on either side of cutter 120 .
- the inline cutter set 160 is shown here having zero rake angle for cutter 120 and side rake cutters 120 ′, 120 ′′, the cutter/backup cutters 120 , 120 ′, 120 ′′ may also include any desired rake angle. While the side rake backup cutter 120 ′, 120 ′′ is included with an inline cutter set 160 , the side rake backup cutter 120 ′, 120 ′′ may be utilized in any backup cutter set, a multiple backup cutter set, a cutter row, a multiple backup cutter row, a staggered cutter row, and a staggered cutter set in any desired manner.
- FIG. 9A Illustrated in FIG. 9A , is a top view representation of an inline cutter set 160 having a cutter 120 , a backup cutter 120 ′, and a backup cutter 120 ′′ all having the same centerline on the bi-center bit 100 ( FIG. 1 ) illustrated as the rotational path for the inline cutter set 160 , the cutter 120 also has any desired back rake angle, the backup cutter 120 ′ being smaller in diameter than cutter 120 and having any desired back rake angle, and a back up cutter 120 ′ being the same diameter as the cutter 120 , having any desired back rake angle, and having any desired side rake angle 155 to the left of the direction of the rotational path, such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, with respect to the rotational path of the inline cutter set 160 .
- the cutter 120 and the backup cutters 120 ′, 120 ′′ are spaced from each other a distance d on blade 118 / 140 while being located on the same rotational path.
- the rotational path in FIG. 9A is a linear representation of a rotational path or swath, or kerf or helical path in which the inline cutter set 160 may be oriented upon bi-center bit 100 .
- FIG. 9B Illustrated in FIG. 9B , is a top view representation of an inline cutter set 160 for the bi-center bit 100 including a cutter 120 and two back raked and side raked backup cutters 120 ′, 120 ′′, all having the same diameter, any desired back rake angle, and any desired side rake angle.
- the cutter 120 and backup cutters 120 ′, 120 ′′ are spaced apart any desired distance d on the blade 128 / 140 .
- the back up cutters 120 ′, 120 ′′ have any desired side rake angle 155 .
- the cutter 120 and side rake backup cutters 120 , 120 ′′ also have any desired back rake.
- FIG. 9B Illustrated in FIG. 9B , is a top view representation of an inline cutter set 160 for the bi-center bit 100 including a cutter 120 and two back raked and side raked backup cutters 120 ′, 120 ′′, all having the same diameter, any desired back rake angle, and any desired side
- the back raked and side raked backup cutter 120 ′ rotationally follows the back raked cutter 120 while back raked and side racked backup cutter 120 ′′ follows backup cutter 120 ′.
- the back raked and side raked cutter 120 ′ includes a side rake angle 155 , such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, to the left of the swath or kerf or the rotational path. While two back raked and side raked backup cutters 120 ′, 120 ′′ are provided in the inline cutter set 160 , additional back raked and side raked backup cutters may be provided.
- FIG. 9C is a linear representation of a rotational or helical path in which the inline cutter set 160 may be oriented upon a blade of a bi-center bit 100 .
- the back raked and side raked backup cutter 120 ′′ rotationally follows the back raked cutter 120 while back raked and side racked backup cutter 120 ′′ follows back up cutter 120 ′.
- the back raked and side raked cutter 120 ′ includes a side rake angle 155 , such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, to the right of the swath, or kerf or the rotational path. While two back raked and side raked backup cutters 120 ′, 120 ′′ are provided in the inline cutter set 160 , additional back raked and side raked backup cutters may be provided.
- FIG. 9D Illustrated in FIG. 9D , is a top view representation of an inline cutter set 160 for the bi-center bit 100 including a back raked cutter 120 and two back raked and side raked backup cutters 120 ′, 120 ′′, all having the same diameter, any desired back rake angle, and any desired side rake angle.
- the cutter 120 and backup cutters 120 ′, 120 ′′ are spaced apart any desired distance d on the blade 118 / 140 .
- FIG. 9D is a linear representation of a rotational or helical path in which the inline cutter set 160 may be oriented upon a blade 118 / 140 of a bi-center bit 100 .
- the back raked and side raked backup cutter 120 ′ rotationally follows the back raked cutter 120 while back raked and side racked backup cutter 120 ′′ follows backup cutter 120 ′.
- the back raked and side raked cutters 120 ′, 120 ′′ include a side rake angle 155 , such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, to the left and right respectively of the swath or kerf or the rotational path. While two back raked and side raked backup cutters 120 ′, 120 ′′ are provided in the inline cutter set 160 , additional back raked and side raked backup cutters may be provided.
- FIG. 9E Illustrated in FIG. 9E , is a top view representation of an inline cutter set 160 for the bi-center bit 100 having a back raked cutter 120 and two back raked and side raked backup cutters 120 ′, 120 ′′, with side raked side raked cutters 120 ′, 120 ′′ having the same direction of the side rake angle being to the left of the rotational path of cutter 120 and being offset a distance D, each about a swath or kerf or rotational path to the left and right of the rotational path of cutter 120 , respectively, while generally following in the swath or kerf or rotational path of the cutter 120 .
- FIG. 9F Illustrated in FIG. 9F , is a top view representation of an inline cutter set 160 for the bi-center bit 100 having a back raked cutter 120 and two back raked and side raked backup cutters 120 ′, 120 ′′, with back raked and side raked cutters 120 ′, 120 ′′ having the same direction of the side rake angle being to the right of the rotational path of cutter 120 and being offset a distance D, each about a swath or kerf or rotational path to the left and right of the rotational path of cutter 120 , respectively, while generally following in swath or kerf or rotational path of the cutter 120 .
- the cutter 120 and the backup cutters 120 ′, 120 ′′ are also spaced a distance d on blade 118 / 140 .
- Cutter 120 and back raked and side raked cutters 120 ′, 120 ′′ have any desired back rake angle, while backup cutters 120 ′, 120 ′′ additionally have any desired side rake angle of approximately 10° to 60° or, in the alternative, approximately 5° to 75°, on blade 118 / 140 of bi-center bit 100 .
- the inline cutter set 160 includes back raked cutter 120 and back raked and side raked backup cutters 120 ′, 120 ′′.
- the back raked and side raked backup cutters 120 ′, 120 ′′ include any desired side rake angles 155 , such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, which are in the same direction to the right of the rotational path.
- FIG. 9G Illustrated in FIG. 9G , is a top view representation of an inline cutter set 160 for the bi-center bit 100 having a back raked cutter 120 and two back raked and side raked backup cutters 120 ′, 120 ′′, with side raked cutters 120 ′, 120 ′′ having opposite side rake angles being to the left ( 120 ′) and right ( 120 ′′) of the rotational path of cutter 120 and being offset a distance D, each about a swath or kerf or rotational path to the left and right of the rotational path of cutter 120 , respectively, while generally following in swath or kerf or rotational path of the cutter 120 .
Abstract
An apparatus for reaming or enlarging a borehole comprising a bi-center drill bit having backup cutters thereon.
Description
- The present invention relates generally to enlarging the diameter of a subterranean borehole, and more specifically to enlarging the borehole below a portion thereof which remains at a lesser diameter. The method and apparatus of the present invention effects such enlargement using a bi-center bit.
- It is known to employ both eccentric and bi-center bits to enlarge a borehole below a “tight,” or undersized. portion thereof.
- An eccentric bit includes a pilot section, above which (as the bit is oriented in the borehole) lies an eccentrically laterally extended or enlarged cutting portion which, when the bit is rotated about its axis, produces an enlarged borehole. An example of an eccentric bit is disclosed in U.S. Pat. Nos. 4,635,738 and 5,957,223.
- A bi-center bit assembly employs two longitudinally superimposed bit sections with laterally offset axes. The first axis is the center of the pass-through diameter, that is, the diameter of the smallest borehole the bit will pass through. This axis may be referred to as the pass-through axis. The second axis is the axis of the hole cut as the bit is rotated. This axis may be referred to as the drilling axis. There is usually a first, lower and smaller diameter pilot section employed to commence the drilling and establish the drilling axis. Rotation of the bit remains centered about the drilling axis as the second, upper and larger radius, main, or reamer, bit section extending beyond the pilot bit section diameter to one side of the bit engages the formation to enlarge the borehole. The rotational axis of the bit assembly then rapidly transitions from the pass-through axis to the drilling axis when the full diameter or “gage” borehole is drilled.
- Rather than employing a one-piece drilling structure, such as an eccentric bit or a bi-center bit, to enlarge a borehole below a constricted or reduced-diameter segment, it is known to employ an extended bottomhole assembly (extended bi-center assembly) with a pilot bit at the distal end thereof and a reamer assembly some distance above. This arrangement permits the use of any standard bit type, be it a rock bit or a drag bit, as the pilot bit, and the extended nature of the assembly permits greater drillstring flexibility when passing through tight spots in the borehole as well as the opportunity to effectively stabilize the pilot bit so that the pilot hole and the following reamer will take the path intended for the borehole. The assignee of the present invention has designed as reaming structures so-called “reamer wings” which generally comprise a tubular body having a fishing neck with a threaded connection at the top thereof, and a tong die surface at the bottom thereof, also with a threaded connection. The upper mid-portion of the reamer wing includes one or more longitudinally extending blades projecting generally radially outwardly from the tubular body, the outer edges of the blades carrying superabrasive (also termed superhard) cutting elements, commonly termed PDCs (for Polycrystalline Diamond Compacts). The lower mid-portion of the reamer wing may include a stabilizing pad having an arcuate exterior surface the same or slightly smaller than the radius of the pilot hole on the exterior of the tubular body and longitudinally below the blades. The stabilizer pad is characteristically placed on the opposite side of the tubular body with respect to the reamer wing blades so that the reamer wing will ride on the pad due to the resultant force vector generated by the cutting of the blade or blades as the enlarged borehole is cut. U.S. Pat. No. 5,497,842, assigned to the assignee of the present invention and the disclosure of which is incorporated herein for all purposes by this reference, is exemplary of such reamer wing designs. U.S. Pat. No. 5,765,653, also assigned to the assignee of the present invention and the disclosure of which is incorporated in its entirety herein, discloses and claims more recent improvements in reamer wings and bottomhole assemblies for use therewith, particularly as regards stabilizing reamer wings and bottomhole assemblies.
- One-piece bi-center bits are more compact, easier to handle for a given hole size, more suitable for directional drilling bottom-hole assemblies (particularly those drilling so-called “short” and “medium” radius non-linear borehole sections), and also less expensive to fabricate than reamer wing assemblies.
- Thus, there remains a need for an improved one piece bi-center bit for use in short and medium radius wells.
- Embodiments of the present invention are directed to a bi-center bit having backup cutters on the blades thereof.
-
FIG. 1 comprises a perspective side view of a bi-center bit in accordance with an embodiment herein; -
FIG. 2 comprises a face view, or view looking up from the bottom of a borehole, of the cross-sectional configuration and cutter placement of the bit depicted inFIG. 1 . -
FIG. 3 is a perspective view of a blade having a cutter and a backup cutter located and oriented at substantially 90° from the cutter thereon; -
FIG. 4 is a perspective view of a blade having a cutter and a backup cutter located and oriented at substantially 90° from the cutter thereon; -
FIG. 5A is a view of a blade of a bi-center bit having a cutter and backup cutter thereon; -
FIG. 5B is a side view of a blade of a bi-center bit having a cutter and a backup cutter thereon; -
FIG. 5C is a cross-sectional view of a portion of a blade of a bi-center bit showing a backup cutter thereon; -
FIG. 5D is a top view of a portion of a blade of a bi-center bit illustrating a cutter having side rake; -
FIG. 6A is a view of a cutter set comprising a cutter and multiple backup cutters; -
FIG. 6B is a view of a cutter set comprising a cutter and multiple backup cutters; -
FIG. 7A is a front view of the cutter set ofFIG. 6A , showing cutting face overlap; -
FIG. 7B is a view of the cutter set ofFIG. 6B showing cutting face overlap; -
FIG. 8 is a perspective view of a blade having a row of primary cutters cutters and multiple rows of backup cutters thereon for a bi-center bit; and -
FIGS. 9 through 9G are each top views of inline cutter sets of an embodiment of the bi-center bit of the present invention. - Referring to
FIG. 1 of the drawings, the depicted bit is illustrated in its normal drilling orientation for clarity. In an embodiment of the invention,bi-center bit 100 includes apilot bit section 112 comprising a plurality ofblades 118 having superabrasive, preferably polycrystalline diamond compact (PDC)cutters 120 andbackup PDC cutters 120′ mounted thereto.Fluid courses 122 extending betweenblades 118 carry drilling fluid laden with cuttings sheared bycutters blades 118 drilling the pilot borehole intojunk slots 124, which extend longitudinally ongage 126 of thebi-center bit 100 betweengage pads 128.Gage pads 128 may be provided with a wear-resistant gage surface in the form of tungsten carbide bricks, natural diamonds, diamond-grit impregnated carbide, or a combination thereof, as known in the art. Drilling fluid is introduced intofluid courses 122 fromports 132 on thebit face 130, which may comprise nozzles (seeFIG. 2 ). - Bi-center
bit 100 also includesreamer bit section 114 comprising a plurality ofblades 140 preferably havingPDC cutters 120 andbackup PDC cutters 120′ mounted thereto. As can be seen inFIG. 1 ,blades 140 comprise any suitable number of blades based on the size of thebi-center bit 100 and may be located generally spaced about 90° from each other about thereamer bit section 114. Ports 142 (which, again, may comprise nozzles, locatedintermediate blades 140, feed drilling fluid intofluid courses 144 located in front of (in the direction of bit rotation)blades 140, to carry away formation cuttings sheared bycutters blades 140 when enlarging the pilot borehole to full gage diameter.Blades 140 includetruncated gage pads 146, which may also preferably include a wear-resistant surface of the types previously mentioned. Oneblade 140 includes an elongatedgage pad 146′ thereon. - Bit shank 150, having a threaded
pin connection 152, is used to connectbi-center bit 100 to a drill collar or to an output shaft of a downhole motor, as known in the art. - Referring now to
FIG. 2 of the drawings, elements ofbi-center bit 100 which have been previously described inFIG. 1 are identified by like reference numerals for clarity. As can be seen fromFIG. 2 ,pilot bit section 112 includes fourblades 118 thereon, thecutters 120 andbackup cutters 120′ have been placed and oriented thereon with thebackup cutter 120′ located behind acutter 120 on the same centerline on ablade 118. - The pockets for the
backup cutters 120′ are located aft of the cutter pocket for thecutters 120 so that thebackup cutters 120′ do not interfere with thecutters 120. Thebackup cutters 120′ are underexposed by approximately 0.025 inch in diameter from thecutters 120 along the cutter profile for ablade 118. Additional backup cutters (not shown) may be located behind thebackup cutters 120′ having any desired back rake angle therefor, to provide an indication when thebi-center bit 100 becomes under-gage by a desired amount, such as under-gage by 0.200 inch in diameter. If thebackup cutters 120′ are positioned to have a 90° back rake angle, a backup cutter such as described in U.S. Pat. No. 6,408,958 may be used by being so oriented and located on ablade 118/140 approximately underexposed by 0.100 inch to provide a decrease in the rate of penetration of thebi-center bit 100 when contacting the formation being drilled. Such a reduction in the rate of penetration of the formation being drilled is an indicator that thebi-center bit 100 is under-gage with respect to the desired diameter of a borehole being formed. - An arrangement of the above-described 90° backrake orientation of
backup cutters 120′ on ablade 118/140 is illustrated inFIGS. 3 and 4 , wherein eachbackup cutter 120′ is located behind acutter 120 on ablade 118/140 at an approximate 90° back rake angle. - If the
blades 118/140 have multiple rows of PDCbackup cutters 120′/120″ thereon (SeeFIGS. 9 through 9G forbackup cutters 120″)backup cutters 120′ are under exposed approximately 0.025 inch from thecutter 120 in front thereof and have approximately the same back rake angle as thecutter 120 located in front thereof, and thebackup cutter 120′/120″ aligns with thecutter 120. - To form the backup cutter pockets in the primary portion of the bi-center bit 100 a flat bottom milling tool cuts the drill bit body by plunging directly into the
blade 118/140 and travels along the center line of thecutter 120 located in front thereof. If thebit 100 is a particle matrix type bit formed of sintered tungsten carbide particles in a suitable matrix, the backup cutter pockets in the primary portion of thebit 100 are formed by casing the backup cutter pockets in thebit 100 as well as the pockets for other cutters for thebit 100. Methods of manufacturing thebit 100 as a particle matrix composite bit are set forth in U.S. application Ser. No. 11/272,439, filed Nov. 10, 2005, entitled “Earth-Boring Rotary Drill Bits and Methods of Manufacturing Earth-Boring Bits Having Particle Matrix Composite Bit Bodies, the disclosure of which is incorporated herein in its entirety by reference. -
Ports 132, which preferably contain nozzles therein as known in the art, direct drilling fluid as shown by the arrows associated therewith, intofluid courses 122 ofbit face 130. Likewise, passages within the bit body feed drilling fluid toports 142 from a central passage or plenum, which also feedsports 132. - Pilot bit gage diameter is defined by the
gage cutters 120′/120″ at the periphery ofbit face 130, and thus corresponds generally to (but is nominally larger than) a circle defined by connecting the radially outer pad surface of gage pads 128 (SeeFIG. 1 ). - The
backup cutters 120′/120″ in thebit reamer section 114 are located in a manner similar to those of the bit face 130 onblades 118 and have the same or similar respective back rake angles. - The addition of
backup cutters 120′, 120″ on thebi-center bit 100 provides an extended reamer blade profile and increased shoulder radius allowing the placement of additional cutters on a blade of thebi-center bit 100, increasing the wear resistance of thebi-center bit 100 in the formation being drilled. Additionally, while thebackup cutters 120′/120″ have been located directly behind acutter 120, if desired,backup cutters 120′ may be somewhat laterally (with respect to the cutter path) offset therefrom while still following in the same kerf of thecutter 120. - Illustrated in
FIG. 5A is a partial view of abi-center bit 100 showing the concept of cutter side rake (side rake) regardingcutters 120, cutter placement (side-side) regardingbackup cutters 120′, and cutter size (size). “Side rake” is the angle at which a cutter is oriented relative to its path of travel, a side rake of 0° being achieved when the cutting face of the cutter is facing normal to the path of cutter travel, illustration and further explanation being provided below with respect toFIG. 5D . “Side-side” is the amount of distance between cutters in adjacent cutter rows. “Size” is the cutter size, typically indicated by a cutter's diameter. -
FIG. 5B illustrates a partial side view of thebi-center bit 100 ofFIG. 1 showing the concepts of back rake (also known as fore and aft rake) regarding cutters/backup cutters 120/120′, relative exposure ofcutters 120′ with respect tocutters 120, cutting edgechamfer regarding cutters 120/120′ and spacing betweencutters 120 andbackup cutters 120′. -
FIG. 5C is a cross-sectional view through the center of a cutter/backup cutter 120/120′/120″ positioned on ablade 118/140 of thebi-center bit 100. The cutting direction, or direction of cutter travel due to bit rotation, is represented by thedirectional arrow 72. The cutter/backup cutter 120/120′/120″ may be mounted on theblades 118/140 in an orientation such that the cutting face of the cutter/backup cutter 120/120′/120″ is oriented at aback rake angle 74 with respect to aline 80. Theline 80 may be defined as a line that extends radially outward from the face of thebi-center bit 100 in a direction substantially perpendicular thereto at that location. Additionally or alternatively, theline 80 may be defined as a line that extends radially outward from the face of thebi-center bit 100 in a direction substantially perpendicular to the cuttingdirection 72. Theback rake angle 74 may be measured relative to theline 80, positive angles being measured in the counter clockwise direction, negative angles being measured in the clockwise direction. As known to those of ordinary skill in the art, the effective back rake angle of a cutter, rather than the physical back rake angle, is a function of cutter location from the bit centerline, and the rate of penetration of the bit during drilling. - The cutter/
backup cutter 120/120′/120″ is shown inFIG. 5C having a negative back rake angle of approximately 20°, thus exhibiting a “back rake.” In other implementations, the cutter/backup cutter 120/120′/120″ may have a positive back rake angle. In such a configuration, the cutter/backup cutter 120/120′/120″ may be said to have a “forward rake.” By way of example and not limitation, each cutter/backup cutter 120/120′/120″ on the face of thebi-center bit 100 shown inFIG. 1 may, conventionally, have a back rake angle in a range extending from about negative 5° to about negative 30°. -
FIG. 5D is an enlarged partial top view of a cutter/backup cutter 120/120′/120″ mounted on ablade 118/140 at the face of thebi-center bit 100 shown inFIG. 1 . The cutting direction is represented by thedirectional arrow 72. The cutter/backup cutter 120/120′/120″ may be mounted on theblade 118/140 in an orientation such that the cutting face of the cutter/backup cutter 120/120′/120″ is oriented substantially perpendicular to the cuttingdirection 72. In such a configuration, the cutter/backup cutter 120/120′/120″ does not exhibit a side rake angle. The side rake angle of the cutter/backup cutter 120/120′/120″ may be defined as the angle between aline 82, which is oriented substantially perpendicular to the cuttingdirection 72, and the cutting face of the cutter/backup cutter 120/120′/120′, positive angles being measured in the counter clockwise direction, negative angles being measured in the clockwise direction. In additional embodiments, the cutter/backup cutter 120/120′/120″ may be mounted in the orientation represented by the dashedline 78A. In this configuration, the cutter/backup cutter 120/120′/120″ may have a negativeside rake angle 76A. Furthermore, the cutter/backup cutter 120/120′/120″ may be mounted in the orientation represented by the dashedline 78B. In this configuration, the cutter/backup cutter 120/120′/120″ may have a positiveside rake angle 76B. By way of example and not limitation, each cutter/backup cutter 120/120′/120″ on the face of thebi-center bit 100 shown inFIG. 1 may have a side rake angle in a range extending from approximately 10° to 60° or, in the alternative, approximately 5° to 75°, although if desired they may have a negative side rake angle of approximately the same range or greater. - Illustrated in
FIG. 6A is a cutter set for ablade 118/140 wherein the cutter set is located about acenterline 200 on theblade 118/140. Thebackup cutters 120′, 120″ are located substantially within the same kerf ascutter 120 alongcenterline 200 while being laterally offset therefrom. Illustrated inFIG. 6B is a cutter set for ablade 118/140 wherein the cutter set is located about acenterline 200 on theblade 118/140. Thebackup cutters 120′, 120″ are located within the same kerf ascutter 120 alongcenterline 200 having no offset therefrom. - Additionally, illustrated in
FIG. 7A is a face view of the cutter set ofFIG. 6A located on ablade 118/140 wherein thebackup cutters 120′, 120″ follow thecutter 120 in the same kerf but are offset both vertically and axially along the centerline of thecutter 120 and have a smaller diameter than that of thecutter 120 and have a lesser exposure. Similarly, illustrated inFIG. 7B is the cutter set ofFIG. 6B located on ablade 118/140 wherein thebackup cutters 120′/120″ are located on the centerline of thecutter 120 in the same kerf but are vertically offset from the centerline and have a smaller diameter than that of thecutter 120,backup cutter 120′ having a lesser exposure thancutter 120, andbackup cutter 120″ having a lesser exposure thanbackup cutter 120′. Thebackup cutters 120′, 120″ may be either the same size ascutter 120′ or smaller size thancutter 120, as illustrated, if desired. - Illustrated in
FIG. 8 is ablade 118/140 havingcutters 120 thereon and multiple rows ofbackup cutters 120′, 120″ thereon, as may be desired or required. - Illustrated in
FIG. 9 is a first example of cutter/backup cutters 120/120′, 120″ of thebi-center bit 100 in a top view representation of an inline cutter set 160 having two side rakedbackup cutters 120′, 120″. Thecutter 120 and thebackup cutters 120′, 120″ are spaced from each other any desired distance d.FIG. 9 illustrates a linear representation of a rotational or helical swath, or kerf or rotational path in which the inline cutter set 160 may be oriented upon a bi-center bit 100 (FIG. 1 ). The inline cutter set 160 includes acutter 120 and two side rakedbackup cutters 120′, 120″. The side rakedbackup cutters 120′, 120″ rotationally follow thecutter 120, and each includes aside rake angle 155 which may be any desired side rake angle to the left of the rotational path, such as approximately 5° to approximately 75°. The side rakedcutter 120″ also includes a side rake angle to the right of the rotational path which is in the opposite direction to that ofside rake cutter 120′, as illustrated. While two side rakedcutters 120′, 120″ are provided in the inline cutter set 160, additional side raked cutters may be provided. Whilewear flats cutter 120 as it wears, by introducing theside rake angle 155 the side rakedcutter 120′, 120″ cut parallel swaths or grooves or rotational paths with theapexes side rake cutters 120′ and 120″ directing the path of the cuttings generated by thebi-center bit 100. Also, as thewear flats cutter 120, theapexes backup cutters 120′, 120″ are able to more effectively fracture and remove formation material on either side ofcutter 120. While the inline cutter set 160 is shown here having zero rake angle forcutter 120 andside rake cutters 120′, 120″, the cutter/backup cutters rake backup cutter 120′, 120″ is included with an inline cutter set 160, the siderake backup cutter 120′, 120″ may be utilized in any backup cutter set, a multiple backup cutter set, a cutter row, a multiple backup cutter row, a staggered cutter row, and a staggered cutter set in any desired manner. - Illustrated in
FIG. 9A , is a top view representation of an inline cutter set 160 having acutter 120, abackup cutter 120′, and abackup cutter 120″ all having the same centerline on the bi-center bit 100 (FIG. 1 ) illustrated as the rotational path for the inline cutter set 160, thecutter 120 also has any desired back rake angle, thebackup cutter 120′ being smaller in diameter thancutter 120 and having any desired back rake angle, and a back upcutter 120′ being the same diameter as thecutter 120, having any desired back rake angle, and having any desiredside rake angle 155 to the left of the direction of the rotational path, such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, with respect to the rotational path of the inline cutter set 160. Thecutter 120 and thebackup cutters 120′, 120″ are spaced from each other a distance d onblade 118/140 while being located on the same rotational path. The rotational path inFIG. 9A is a linear representation of a rotational path or swath, or kerf or helical path in which the inline cutter set 160 may be oriented uponbi-center bit 100. - Illustrated in
FIG. 9B , is a top view representation of an inline cutter set 160 for thebi-center bit 100 including acutter 120 and two back raked and side rakedbackup cutters 120′, 120″, all having the same diameter, any desired back rake angle, and any desired side rake angle. Thecutter 120 andbackup cutters 120′, 120″ are spaced apart any desired distance d on theblade 128/140. The back upcutters 120′, 120″ have any desiredside rake angle 155. Thecutter 120 and side rakebackup cutters FIG. 9B is a linear representation of a rotational or helical path in which the inline cutter set 160 may be oriented upon abi-center bit 100. The back raked and side rakedbackup cutter 120′ rotationally follows the back rakedcutter 120 while back raked and side rackedbackup cutter 120″ followsbackup cutter 120′. The back raked and side rakedcutter 120′ includes aside rake angle 155, such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, to the left of the swath or kerf or the rotational path. While two back raked and side rakedbackup cutters 120′, 120″ are provided in the inline cutter set 160, additional back raked and side raked backup cutters may be provided. - Illustrated in
FIG. 9C , is a top view representation of an inline cutter set 160 for thebi-center bit 100 including acutter 120 and two back raked and side rakedbackup cutters 120′, 120″ all having the same diameter, and desired back rake angle, and any desired side rake angle. Thecutter 120 andbackup cutters 120′, 120″ are spaced apart any desired distance d on theblade 118/140. The back upcutters 120′, 120″ have any desiredside rake angle 155 therefore. Thecutter 120 and side rakedbackup cutters 120′, 120″ also have any desired back rake.FIG. 9C is a linear representation of a rotational or helical path in which the inline cutter set 160 may be oriented upon a blade of abi-center bit 100. The back raked and side rakedbackup cutter 120″ rotationally follows the back rakedcutter 120 while back raked and side rackedbackup cutter 120″ follows back upcutter 120′. The back raked and side rakedcutter 120′ includes aside rake angle 155, such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, to the right of the swath, or kerf or the rotational path. While two back raked and side rakedbackup cutters 120′, 120″ are provided in the inline cutter set 160, additional back raked and side raked backup cutters may be provided. - Illustrated in
FIG. 9D , is a top view representation of an inline cutter set 160 for thebi-center bit 100 including a back rakedcutter 120 and two back raked and side rakedbackup cutters 120′, 120″, all having the same diameter, any desired back rake angle, and any desired side rake angle. Thecutter 120 andbackup cutters 120′, 120″ are spaced apart any desired distance d on theblade 118/140.FIG. 9D is a linear representation of a rotational or helical path in which the inline cutter set 160 may be oriented upon ablade 118/140 of abi-center bit 100. The back raked and side rakedbackup cutter 120′ rotationally follows the back rakedcutter 120 while back raked and side rackedbackup cutter 120″ followsbackup cutter 120′. The back raked and side rakedcutters 120′, 120″ include aside rake angle 155, such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, to the left and right respectively of the swath or kerf or the rotational path. While two back raked and side rakedbackup cutters 120′, 120″ are provided in the inline cutter set 160, additional back raked and side raked backup cutters may be provided. - Illustrated in
FIG. 9E , is a top view representation of an inline cutter set 160 for thebi-center bit 100 having a back rakedcutter 120 and two back raked and side rakedbackup cutters 120′, 120″, with side raked side rakedcutters 120′, 120″ having the same direction of the side rake angle being to the left of the rotational path ofcutter 120 and being offset a distance D, each about a swath or kerf or rotational path to the left and right of the rotational path ofcutter 120, respectively, while generally following in the swath or kerf or rotational path of thecutter 120. Thecutter 120 and thebackup cutters 120′, 120″ are also spaced a distance d onblade 118/140.Cutter 120 andbackup cutters 120′, 120″ having any desired back rake angle, whilebackup cutters 120′, 120″ additionally have any desired side rake angle of approximately 10° to 60° or, in the alternative, approximately 5° to 75°, onblade 23 ofbi-center bit 100. The inline cutter set 160 includes back rakedcutter 120 and back raked and side rakedbackup cutters 120′, 120″. The back raked and side rakedbackup cutters 120′, 120″ include any desired side rake angles 155, such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, which are in the same direction to the left. - Illustrated in
FIG. 9F , is a top view representation of an inline cutter set 160 for thebi-center bit 100 having a back rakedcutter 120 and two back raked and side rakedbackup cutters 120′, 120″, with back raked and side rakedcutters 120′, 120″ having the same direction of the side rake angle being to the right of the rotational path ofcutter 120 and being offset a distance D, each about a swath or kerf or rotational path to the left and right of the rotational path ofcutter 120, respectively, while generally following in swath or kerf or rotational path of thecutter 120. Thecutter 120 and thebackup cutters 120′, 120″ are also spaced a distance d onblade 118/140.Cutter 120 and back raked and side rakedcutters 120′, 120″ have any desired back rake angle, whilebackup cutters 120′, 120″ additionally have any desired side rake angle of approximately 10° to 60° or, in the alternative, approximately 5° to 75°, onblade 118/140 ofbi-center bit 100. The inline cutter set 160 includes back rakedcutter 120 and back raked and side rakedbackup cutters 120′, 120″. The back raked and side rakedbackup cutters 120′, 120″ include any desired side rake angles 155, such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, which are in the same direction to the right of the rotational path. - Illustrated in
FIG. 9G , is a top view representation of an inline cutter set 160 for thebi-center bit 100 having a back rakedcutter 120 and two back raked and side rakedbackup cutters 120′, 120″, with side rakedcutters 120′, 120″ having opposite side rake angles being to the left (120′) and right (120″) of the rotational path ofcutter 120 and being offset a distance D, each about a swath or kerf or rotational path to the left and right of the rotational path ofcutter 120, respectively, while generally following in swath or kerf or rotational path of thecutter 120. Thecutter 120 and thebackup cutters 120′, 120″ are also spaced a distance d onblade 118/140.Cutter 120 and side rakedcutters 120′, 120″ have any desired back rake angle, whilebackup cutters 120′, 120″ additionally have any desired side rake angle of approximately 10° to 60° or, in the alternative, approximately 5° to 75°, onblade 118/140 ofbi-center bit 100. The inline cutter set 160 includes back rakedcutter 120 and back raked and side rakedbackup cutters 120′, 120″. The back raked and side rakedbackup cutters 120′, 120″ include any desired side rake angles 155, such as approximately 10° to 60° or, in the alternative, approximately 5° to 75°, which are directed to the right and left. - While the bi-center bit according to the present invention has been disclosed herein with reference to an illustrated embodiment, those of ordinary skill in the art will understand and appreciate that the invention is not so limited, and that additions, deletions and modifications to the disclosed embodiment may be made without departing from the scope of the invention as hereinafter claimed, and legal equivalents.
Claims (20)
1. A bi-center drill bit for drilling subterranean formations, comprising:
a pilot bit section having a longitudinal axis, defining a first gage diameter and carrying a a first cutting structure for rotationally engaging a subterranean formation; and
a reamer bit section adjacent the pilot bit section, a portion of the reamer bit section extending radially beyond the first gage diameter along a minor portion of a side periphery of the bi-center drill bit and carrying a second cutting structure on the reamer bit section for rotationally engaging the subterranean formations; and
a third cutting structure disposed on at least one of the pilot bit section and the reamer bit section, the third cutting structure being positioned rotationally aft of at least one of the first cutting structure and the second cutting structure.
2. The bi-center drill bit of claim 1 , wherein the pilot bit section comprises a fixed-cutter bit and the first cutting structure comprises at least one superabrasive cutter.
3. The bi-center drill bit of claim 1 , wherein the second cutting structure and the third cutting structure each comprises at least one superabrasive cutter.
4. The bi-center drill bit of claim 1 , wherein the reamer bit section comprises a plurality of substantially radially-extending, circumferentially spaced blades, at least one blade of the plurality of substantially radially extending, circumferentially spaced blades extending radially beyond the first gage diameter.
5. The bi-center drill bit of claim 1 , wherein the pilot bit section includes a face carrying the first cutting structure.
6. The bi-center drill bit of claim 1 , wherein the third cutting structure is disposed on the reamer bit section and positioned rotationally aft of the second cutting structure, wherein the pilot bit section further comprises a fourth backup cutting structure rotationally aft of the first cutting structure for rotationally engaging a subterranean formation and, wherein the reamer bit section further comprises a fifth backup cutting structure rotationally aft of the third cutting structure for rotationally engaging a subterranean formation.
7. A bi-center drill bit for drilling subterranean formations, comprising:
a pilot bit section having a longitudinal axis, defining a first gage diameter and carrying a first cutting structure and a second cutting structure rotationally aft of the first cutting structure thereon for engaging a subterranean formation; and
a reamer bit section adjacent the pilot bit section, a portion of the reamer bit section extending radially beyond the first gage diameter along a minor portion of a side periphery of the bi-center drill bit and carrying a third cutting structure and a fourth cutting structure rotationally aft of the third cutting structure on the reamer bit section for engaging the subterranean formations.
8. The bi-center drill bit of claim 7 , wherein the pilot bit section comprises a fixed-cutter.
9. The bi-center drill bit of claim 7 , wherein the first cutting structure and the second cutting structure each comprise a plurality of superabrasive cutters.
10. The bi-center drill bit of claim 7 , wherein the reamer bit section comprises a plurality of substantially radially-extending, circumferentially spaced blades, at least one blade of the plurality of substantially radially extending, circumferentially spaced blades extending radially beyond the first gage diameter.
11. The bi-center drill bit of claim 7 , wherein the pilot bit section includes a face carrying the first cutting structure.
12. The bi-center drill bit of claim 7 , wherein the pilot bit section further comprises a fifth backup cutting structure rotationally aft of the first cutting structure for engaging a subterranean formation and wherein the reamer bit section comprises a sixth backup cutting structure rotationally aft of the third cutting structure for engaging a subterranean formation.
13. The bi-center drill bit of claim 7 , wherein the second cutting structure includes at least one of a back rake angle and a side rake angle.
14. The bi-center drill bit of claim 7 , wherein the fourth cutting structure includes at least one of a back rake angle and a side rake angle.
15. The bi-center drill bit of claim 7 , wherein the second cutting structure and the fourth cutting structure each includes at least one of a back rake angle and a side rake angle.
16. A bi-center drill bit for drilling subterranean formations, comprising:
a pilot drag bit section having a longitudinal axis, defining a first gage diameter and including a body with a face having a first plurality of superabrasive cutters secured thereto and a second plurality of backup superabrasive cutters located rotationally aft of the first plurality of superabrasive cutters and a gage section extending longitudinally from a periphery of the face; and
a reamer bit section adjacent the pilot drag bit section including at least one blade extending radially beyond the first gage diameter on one peripheral side portion of the bi-centered drill bit and carrying a third plurality of superabrasive cutters thereon and a fourth plurality of superabrasive cutters thereon located rotationally aft of the third plurality of superabrasive cutters.
17. The bi-center drill bit of claim 16 , wherein the at least one blade comprises a plurality of circumferentially spaced blades.
18. The bi-center drill bit of claim 16 , wherein the gage section includes gage pads.
19. The bi-center drill bit of claim 18 , wherein the gage pads provide a bearing surface area on a portion of the gage section.
20. The bi-center drill bit of claim 19 , wherein the gage pads comprise a plurality of circumferentially spaced, longitudinally elongated gage pads separated by longitudinally extending junk slots.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/498,516 US20110005841A1 (en) | 2009-07-07 | 2009-07-07 | Backup cutting elements on non-concentric reaming tools |
RU2012103936/03A RU2012103936A (en) | 2009-07-07 | 2010-07-06 | DUPLICATING CUTTING ELEMENTS ON A NONCONCENTRIC EXPANDER TOOL |
BR112012000466A BR112012000466A2 (en) | 2009-07-07 | 2010-07-06 | spare cutting elements in non-concentric flare tools |
EP10797731.6A EP2452035A4 (en) | 2009-07-07 | 2010-07-06 | Backup cutting elements on non-concentric reaming tools |
PCT/US2010/041084 WO2011005774A2 (en) | 2009-07-07 | 2010-07-06 | Backup cutting elements on non-concentric reaming tools |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/498,516 US20110005841A1 (en) | 2009-07-07 | 2009-07-07 | Backup cutting elements on non-concentric reaming tools |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110005841A1 true US20110005841A1 (en) | 2011-01-13 |
Family
ID=43426647
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/498,516 Abandoned US20110005841A1 (en) | 2009-07-07 | 2009-07-07 | Backup cutting elements on non-concentric reaming tools |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110005841A1 (en) |
EP (1) | EP2452035A4 (en) |
BR (1) | BR112012000466A2 (en) |
RU (1) | RU2012103936A (en) |
WO (1) | WO2011005774A2 (en) |
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US20090266614A1 (en) * | 2008-04-23 | 2009-10-29 | Matthias Meister | Methods, systems, and bottom hole assemblies including reamer with varying effective back rake |
US20100155145A1 (en) * | 2008-12-19 | 2010-06-24 | Rudolf Carl Pessier | Hybrid drill bit with secondary backup cutters positioned with high side rake angles |
US20100193248A1 (en) * | 2009-01-30 | 2010-08-05 | Baker Hughes Incorporated | Methods, systems, and tool assemblies for distributing weight between an earth-boring rotary drill bit and a reamer device |
WO2013151956A1 (en) * | 2012-04-02 | 2013-10-10 | Baker Hughes Incorporated | Cutting structures, tools for use in subterranean boreholes including cutting structures and related methods |
WO2014028457A1 (en) | 2012-08-14 | 2014-02-20 | Chevron U.S.A. Inc. | Reamer with improved performance characteristics in hard and abrasive formations |
US20140231142A1 (en) * | 2013-02-20 | 2014-08-21 | Schlumberger Technology Corporation | Drill bit systems with temperature sensors and applications using temperature sensor measurements |
WO2015035143A1 (en) * | 2013-09-06 | 2015-03-12 | Baker Hughes Incorporated | Reamer blades exhibiting at least one of enhanced gage cutting element backrakes and exposures and reamers so equipped |
US20150144405A1 (en) * | 2013-11-25 | 2015-05-28 | Smith International, Inc. | Cutter block for a downhole underreamer |
WO2016014472A1 (en) * | 2014-07-21 | 2016-01-28 | Schlumberger Canada Limited | Reamer |
WO2016014477A1 (en) * | 2014-07-21 | 2016-01-28 | Schlumberger Canada Limited | Reamer |
US9464490B2 (en) | 2012-05-03 | 2016-10-11 | Smith International, Inc. | Gage cutter protection for drilling bits |
US20170211336A1 (en) * | 2012-12-03 | 2017-07-27 | Ulterra Drilling Technologies, L.P. | Earth Boring Tool with Improved Arrangements of Cutter Side Rakes |
US10047565B2 (en) * | 2012-02-03 | 2018-08-14 | Baker Hughes Incorporated | Cutting element retention for high exposure cutting elements on earth-boring tools |
US10415318B2 (en) | 2013-12-06 | 2019-09-17 | Schlumberger Technology Corporation | Expandable reamer |
US10428587B2 (en) * | 2013-12-26 | 2019-10-01 | Halliburton Energy Services, Inc. | Multilevel force balanced downhole drilling tools including cutting elements in a step profile configuration |
US10508499B2 (en) | 2014-07-21 | 2019-12-17 | Schlumberger Technology Corporation | Reamer |
US10519722B2 (en) | 2014-07-21 | 2019-12-31 | Schlumberger Technology Corporation | Reamer |
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US10704332B2 (en) | 2014-07-21 | 2020-07-07 | Schlumberger Technology Corporation | Downhole rotary cutting tool |
CN111971447A (en) * | 2018-03-16 | 2020-11-20 | 阿特拉钻孔技术有限合伙公司 | Polycrystalline diamond compact bit |
US11008814B2 (en) | 2018-11-12 | 2021-05-18 | Ulterra Drilling Technologies, Lp | Drill bit |
US11208847B2 (en) | 2017-05-05 | 2021-12-28 | Schlumberger Technology Corporation | Stepped downhole tools and methods of use |
WO2022211782A1 (en) * | 2021-03-29 | 2022-10-06 | Chevron U.S.A. Inc. | Reamers with improved durability and/or stability |
US11480016B2 (en) | 2018-11-12 | 2022-10-25 | Ulterra Drilling Technologies, L.P. | Drill bit |
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CN112302542B (en) * | 2020-10-30 | 2022-03-22 | 中国石油大学(北京) | PDC drill bit |
Citations (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4635738A (en) * | 1984-04-14 | 1987-01-13 | Norton Christensen, Inc. | Drill bit |
US5497842A (en) * | 1995-04-28 | 1996-03-12 | Baker Hughes Incorporated | Reamer wing for enlarging a borehole below a smaller-diameter portion therof |
US5531281A (en) * | 1993-07-16 | 1996-07-02 | Camco Drilling Group Ltd. | Rotary drilling tools |
US5765653A (en) * | 1996-10-09 | 1998-06-16 | Baker Hughes Incorporated | Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter |
US5957223A (en) * | 1997-03-05 | 1999-09-28 | Baker Hughes Incorporated | Bi-center drill bit with enhanced stabilizing features |
USRE36817E (en) * | 1995-04-28 | 2000-08-15 | Baker Hughes Incorporated | Method and apparatus for drilling and enlarging a borehole |
US6269893B1 (en) * | 1999-06-30 | 2001-08-07 | Smith International, Inc. | Bi-centered drill bit having improved drilling stability mud hydraulics and resistance to cutter damage |
US20020020565A1 (en) * | 2000-08-21 | 2002-02-21 | Hart Steven James | Multi-directional cutters for drillout bi-center drill bits |
US6394200B1 (en) * | 1999-10-28 | 2002-05-28 | Camco International (U.K.) Limited | Drillout bi-center bit |
US6408958B1 (en) * | 2000-10-23 | 2002-06-25 | Baker Hughes Incorporated | Superabrasive cutting assemblies including cutters of varying orientations and drill bits so equipped |
US20020104688A1 (en) * | 1999-06-30 | 2002-08-08 | Carl Hoffmaster | Bi-centered drill bit having enhanced casing drill-out capability and improved directional stability |
US6695080B2 (en) * | 1999-09-09 | 2004-02-24 | Baker Hughes Incorporated | Reaming apparatus and method with enhanced structural protection |
US6739416B2 (en) * | 2002-03-13 | 2004-05-25 | Baker Hughes Incorporated | Enhanced offset stabilization for eccentric reamers |
US20070102199A1 (en) * | 2005-11-10 | 2007-05-10 | Smith Redd H | Earth-boring rotary drill bits and methods of manufacturing earth-boring rotary drill bits having particle-matrix composite bit bodies |
US20070102198A1 (en) * | 2005-11-10 | 2007-05-10 | Oxford James A | Earth-boring rotary drill bits and methods of forming earth-boring rotary drill bits |
US20070261890A1 (en) * | 2006-05-10 | 2007-11-15 | Smith International, Inc. | Fixed Cutter Bit With Centrally Positioned Backup Cutter Elements |
US20080179108A1 (en) * | 2007-01-25 | 2008-07-31 | Mcclain Eric E | Rotary drag bit and methods therefor |
US7419016B2 (en) * | 2006-03-23 | 2008-09-02 | Hall David R | Bi-center drill bit |
US20080264695A1 (en) * | 2007-04-05 | 2008-10-30 | Baker Hughes Incorporated | Hybrid Drill Bit and Method of Drilling |
US20080302575A1 (en) * | 2007-06-11 | 2008-12-11 | Smith International, Inc. | Fixed Cutter Bit With Backup Cutter Elements on Primary Blades |
US20090145663A1 (en) * | 2007-12-10 | 2009-06-11 | Smith International, Inc. | Drill Bit Having Enhanced Stabilization Features |
US20090145669A1 (en) * | 2007-12-07 | 2009-06-11 | Smith International, Inc. | Drill Bit Cutting Structure and Methods to Maximize Depth-0f-Cut For Weight on Bit Applied |
US20090294173A1 (en) * | 2008-05-29 | 2009-12-03 | Smith International, Inc. | Wear indicators for expandable earth boring apparatus |
US20110100714A1 (en) * | 2009-10-29 | 2011-05-05 | Moss William A | Backup cutting elements on non-concentric earth-boring tools and related methods |
-
2009
- 2009-07-07 US US12/498,516 patent/US20110005841A1/en not_active Abandoned
-
2010
- 2010-07-06 WO PCT/US2010/041084 patent/WO2011005774A2/en active Application Filing
- 2010-07-06 EP EP10797731.6A patent/EP2452035A4/en not_active Withdrawn
- 2010-07-06 BR BR112012000466A patent/BR112012000466A2/en not_active IP Right Cessation
- 2010-07-06 RU RU2012103936/03A patent/RU2012103936A/en not_active Application Discontinuation
Patent Citations (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4635738A (en) * | 1984-04-14 | 1987-01-13 | Norton Christensen, Inc. | Drill bit |
US5531281A (en) * | 1993-07-16 | 1996-07-02 | Camco Drilling Group Ltd. | Rotary drilling tools |
US5497842A (en) * | 1995-04-28 | 1996-03-12 | Baker Hughes Incorporated | Reamer wing for enlarging a borehole below a smaller-diameter portion therof |
USRE36817E (en) * | 1995-04-28 | 2000-08-15 | Baker Hughes Incorporated | Method and apparatus for drilling and enlarging a borehole |
US5765653A (en) * | 1996-10-09 | 1998-06-16 | Baker Hughes Incorporated | Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter |
US5957223A (en) * | 1997-03-05 | 1999-09-28 | Baker Hughes Incorporated | Bi-center drill bit with enhanced stabilizing features |
US6269893B1 (en) * | 1999-06-30 | 2001-08-07 | Smith International, Inc. | Bi-centered drill bit having improved drilling stability mud hydraulics and resistance to cutter damage |
US6659207B2 (en) * | 1999-06-30 | 2003-12-09 | Smith International, Inc. | Bi-centered drill bit having enhanced casing drill-out capability and improved directional stability |
US20020104688A1 (en) * | 1999-06-30 | 2002-08-08 | Carl Hoffmaster | Bi-centered drill bit having enhanced casing drill-out capability and improved directional stability |
US6464024B2 (en) * | 1999-06-30 | 2002-10-15 | Smith International, Inc. | Bi-centered drill bit having improved drilling stability, mud hydraulics and resistance to cutter damage |
US6695080B2 (en) * | 1999-09-09 | 2004-02-24 | Baker Hughes Incorporated | Reaming apparatus and method with enhanced structural protection |
US6394200B1 (en) * | 1999-10-28 | 2002-05-28 | Camco International (U.K.) Limited | Drillout bi-center bit |
US6606923B2 (en) * | 1999-10-28 | 2003-08-19 | Grant Prideco, L.P. | Design method for drillout bi-center bits |
US20020020565A1 (en) * | 2000-08-21 | 2002-02-21 | Hart Steven James | Multi-directional cutters for drillout bi-center drill bits |
US6408958B1 (en) * | 2000-10-23 | 2002-06-25 | Baker Hughes Incorporated | Superabrasive cutting assemblies including cutters of varying orientations and drill bits so equipped |
US6739416B2 (en) * | 2002-03-13 | 2004-05-25 | Baker Hughes Incorporated | Enhanced offset stabilization for eccentric reamers |
US20070102199A1 (en) * | 2005-11-10 | 2007-05-10 | Smith Redd H | Earth-boring rotary drill bits and methods of manufacturing earth-boring rotary drill bits having particle-matrix composite bit bodies |
US20070102198A1 (en) * | 2005-11-10 | 2007-05-10 | Oxford James A | Earth-boring rotary drill bits and methods of forming earth-boring rotary drill bits |
US7419016B2 (en) * | 2006-03-23 | 2008-09-02 | Hall David R | Bi-center drill bit |
US20070261890A1 (en) * | 2006-05-10 | 2007-11-15 | Smith International, Inc. | Fixed Cutter Bit With Centrally Positioned Backup Cutter Elements |
US20080179106A1 (en) * | 2007-01-25 | 2008-07-31 | Baker Hughes Incorporated | Rotary drag bit |
US20080179108A1 (en) * | 2007-01-25 | 2008-07-31 | Mcclain Eric E | Rotary drag bit and methods therefor |
US20080264695A1 (en) * | 2007-04-05 | 2008-10-30 | Baker Hughes Incorporated | Hybrid Drill Bit and Method of Drilling |
US20080302575A1 (en) * | 2007-06-11 | 2008-12-11 | Smith International, Inc. | Fixed Cutter Bit With Backup Cutter Elements on Primary Blades |
US20090145669A1 (en) * | 2007-12-07 | 2009-06-11 | Smith International, Inc. | Drill Bit Cutting Structure and Methods to Maximize Depth-0f-Cut For Weight on Bit Applied |
US20090145663A1 (en) * | 2007-12-10 | 2009-06-11 | Smith International, Inc. | Drill Bit Having Enhanced Stabilization Features |
US20090294173A1 (en) * | 2008-05-29 | 2009-12-03 | Smith International, Inc. | Wear indicators for expandable earth boring apparatus |
US20110100714A1 (en) * | 2009-10-29 | 2011-05-05 | Moss William A | Backup cutting elements on non-concentric earth-boring tools and related methods |
Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8074741B2 (en) * | 2008-04-23 | 2011-12-13 | Baker Hughes Incorporated | Methods, systems, and bottom hole assemblies including reamer with varying effective back rake |
US20090266614A1 (en) * | 2008-04-23 | 2009-10-29 | Matthias Meister | Methods, systems, and bottom hole assemblies including reamer with varying effective back rake |
US20100155145A1 (en) * | 2008-12-19 | 2010-06-24 | Rudolf Carl Pessier | Hybrid drill bit with secondary backup cutters positioned with high side rake angles |
US8047307B2 (en) * | 2008-12-19 | 2011-11-01 | Baker Hughes Incorporated | Hybrid drill bit with secondary backup cutters positioned with high side rake angles |
US8584776B2 (en) | 2009-01-30 | 2013-11-19 | Baker Hughes Incorporated | Methods, systems, and tool assemblies for distributing weight between an earth-boring rotary drill bit and a reamer device |
US20100193248A1 (en) * | 2009-01-30 | 2010-08-05 | Baker Hughes Incorporated | Methods, systems, and tool assemblies for distributing weight between an earth-boring rotary drill bit and a reamer device |
US10047565B2 (en) * | 2012-02-03 | 2018-08-14 | Baker Hughes Incorporated | Cutting element retention for high exposure cutting elements on earth-boring tools |
WO2013151956A1 (en) * | 2012-04-02 | 2013-10-10 | Baker Hughes Incorporated | Cutting structures, tools for use in subterranean boreholes including cutting structures and related methods |
US9885213B2 (en) | 2012-04-02 | 2018-02-06 | Baker Hughes Incorporated | Cutting structures, tools for use in subterranean boreholes including cutting structures and related methods |
US9493991B2 (en) | 2012-04-02 | 2016-11-15 | Baker Hughes Incorporated | Cutting structures, tools for use in subterranean boreholes including cutting structures and related methods |
US9464490B2 (en) | 2012-05-03 | 2016-10-11 | Smith International, Inc. | Gage cutter protection for drilling bits |
WO2014028457A1 (en) | 2012-08-14 | 2014-02-20 | Chevron U.S.A. Inc. | Reamer with improved performance characteristics in hard and abrasive formations |
EP2885482A4 (en) * | 2012-08-14 | 2016-07-27 | Chevron Usa Inc | Reamer with improved performance characteristics in hard and abrasive formations |
US10563463B2 (en) * | 2012-12-03 | 2020-02-18 | Ulterra Drilling Technologies, L.P. | Earth boring tool with improved arrangements of cutter side rakes |
US20170211336A1 (en) * | 2012-12-03 | 2017-07-27 | Ulterra Drilling Technologies, L.P. | Earth Boring Tool with Improved Arrangements of Cutter Side Rakes |
US20140231142A1 (en) * | 2013-02-20 | 2014-08-21 | Schlumberger Technology Corporation | Drill bit systems with temperature sensors and applications using temperature sensor measurements |
US9297251B2 (en) * | 2013-02-20 | 2016-03-29 | Schlumberger Technology Corporation | Drill bit systems with temperature sensors and applications using temperature sensor measurements |
WO2015035143A1 (en) * | 2013-09-06 | 2015-03-12 | Baker Hughes Incorporated | Reamer blades exhibiting at least one of enhanced gage cutting element backrakes and exposures and reamers so equipped |
US9739094B2 (en) | 2013-09-06 | 2017-08-22 | Baker Hughes Incorporated | Reamer blades exhibiting at least one of enhanced gage cutting element backrakes and exposures and reamers so equipped |
US20150144405A1 (en) * | 2013-11-25 | 2015-05-28 | Smith International, Inc. | Cutter block for a downhole underreamer |
US10415318B2 (en) | 2013-12-06 | 2019-09-17 | Schlumberger Technology Corporation | Expandable reamer |
US10428587B2 (en) * | 2013-12-26 | 2019-10-01 | Halliburton Energy Services, Inc. | Multilevel force balanced downhole drilling tools including cutting elements in a step profile configuration |
US10508499B2 (en) | 2014-07-21 | 2019-12-17 | Schlumberger Technology Corporation | Reamer |
US10501995B2 (en) | 2014-07-21 | 2019-12-10 | Schlumberger Technology Corporation | Reamer |
WO2016014472A1 (en) * | 2014-07-21 | 2016-01-28 | Schlumberger Canada Limited | Reamer |
US10519722B2 (en) | 2014-07-21 | 2019-12-31 | Schlumberger Technology Corporation | Reamer |
WO2016014477A1 (en) * | 2014-07-21 | 2016-01-28 | Schlumberger Canada Limited | Reamer |
US10584538B2 (en) | 2014-07-21 | 2020-03-10 | Schlumberger Technology Corporation | Reamer |
US10612309B2 (en) | 2014-07-21 | 2020-04-07 | Schlumberger Technology Corporation | Reamer |
US10704332B2 (en) | 2014-07-21 | 2020-07-07 | Schlumberger Technology Corporation | Downhole rotary cutting tool |
US11208847B2 (en) | 2017-05-05 | 2021-12-28 | Schlumberger Technology Corporation | Stepped downhole tools and methods of use |
CN111971447A (en) * | 2018-03-16 | 2020-11-20 | 阿特拉钻孔技术有限合伙公司 | Polycrystalline diamond compact bit |
US11008814B2 (en) | 2018-11-12 | 2021-05-18 | Ulterra Drilling Technologies, Lp | Drill bit |
US11480016B2 (en) | 2018-11-12 | 2022-10-25 | Ulterra Drilling Technologies, L.P. | Drill bit |
WO2022211782A1 (en) * | 2021-03-29 | 2022-10-06 | Chevron U.S.A. Inc. | Reamers with improved durability and/or stability |
Also Published As
Publication number | Publication date |
---|---|
WO2011005774A4 (en) | 2011-06-03 |
EP2452035A2 (en) | 2012-05-16 |
BR112012000466A2 (en) | 2016-02-16 |
WO2011005774A3 (en) | 2011-05-05 |
RU2012103936A (en) | 2013-08-20 |
WO2011005774A2 (en) | 2011-01-13 |
EP2452035A4 (en) | 2015-08-26 |
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Legal Events
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AS | Assignment |
Owner name: BAKER HUGHES INCORPORATED, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WOOD, MATTHEW S.;SINKINSON, JAMES O.;SIGNING DATES FROM 20090620 TO 20090629;REEL/FRAME:022921/0205 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |