WO2008006010A2 - Cutters for downhole cutting devices - Google Patents
Cutters for downhole cutting devices Download PDFInfo
- Publication number
- WO2008006010A2 WO2008006010A2 PCT/US2007/072811 US2007072811W WO2008006010A2 WO 2008006010 A2 WO2008006010 A2 WO 2008006010A2 US 2007072811 W US2007072811 W US 2007072811W WO 2008006010 A2 WO2008006010 A2 WO 2008006010A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutter
- cutting
- cutting tool
- width
- cutters
- Prior art date
Links
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 239000007937 lozenge Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
- E21B10/5673—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a non planar or non circular cutting face
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
Definitions
- the invention relates generally to the design and use of cutters for the cutting arms and blades of underreamers, mills and other downhole tools.
- Rotary cutting mills and mandrel cutters are devices that are incorporated into a drill string and used to cut laterally through metallic tubular members, such as casing on the sides of a wellbore, liners, tubing, pipe or mandrels.
- Mandrel cutters are used to create a separation in metallic tubular members.
- Cutting mills are tools that are used in a sidetracking operation to cut a window through surrounding casing and allow drilling of a deviated drill hole.
- numerous small individual cutters are attached to multiple arms or blades that are rotated about a hub. Most conventional cutters present a circular cutting face.
- Other conventional cutter shapes include square, star-shaped, and trapezoidal, although these are less common.
- Mandrel cutters are problematic because they require the use of cutting portions that are very small and narrow in order to effectively cut through the mandrel.
- the limitation on the size of the cutting portion exacerbates the bonding area problem described above.
- the invention provides an improved cutter design as well as an improved design for downhole cutters, for use with cutting devices such as mandrel cutters, and rotary cutter mills.
- the invention describes an improved cutter having a rectangular, rounded "lozenge" shape.
- the cutter may be formed of carbide or be a polycrystalline diamond compact ("PDC") cutter.
- PDC polycrystalline diamond compact
- the cutter presents a cross-sectional cutting area having a pair of curvilinear, and preferably arcuate, end sections and an elongated central section having substantially straight or flat sides.
- the overall length of the cutter is 1.5 times the width.
- the cutter includes a raised cutter edge for chip breaking during cutting.
- the cutters of the present invention provide advantages for attachment to a cutter arm or blade. Bond area is increased. Therefore, the cutters remain in place more securely. Also, placement of the rounded, rectangular cutters on a cutting arm results in less interstitial space between cutters. In return, this results in less extrusion of ductile metals into the interstitial spaces and less resultant damage to the arm or blade carrying the cutters.
- FIG. 1 is an isometric view of an exemplary cutter constructed in accordance with the present invention.
- Figure 2 is a top view of the cutter shown in Figure 1.
- Figure 3 is a top view of an exemplary cutter of alternate construction in accordance with the present invention.
- Figure 4 is an illustration of an exemplary cutting arm for a downhole cutter having a plurality of prior art circular cutters secured thereupon.
- Figure 5 is an illustration of an exemplary cutting arm for a downhole cutter having secured thereupon a plurality of cutters of the type shown in Figures 1 and 2.
- Figures 6 and 6A depict an exemplary mandrel cutting arm with cutters of the type shown in Figures 1 and 2.
- Figure 7 illustrates an exemplary downhole rotary cutting mill which incorporates cutters in accordance with the present invention.
- FIGS 1 and 2 depict an exemplary cutter 10 that is constructed in accordance with the present invention.
- the cutter 10 has a body 12 that is preferably formed of hardened carbide. However, the cutter 10 might also be formed of PDC, as is known in the art, or another substance suitable for use in downhole cutting.
- the body 12 features a cutting face 14 and a sidewall 16.
- the cutter 10 features a raised chip-breaking edge 18 that is located proximate the outer circumference of the cutting face 14.
- the body 12 of the cutter 10 is generally made up of three sections: two end sections 20, 22 with end walls 23 that are semi-circular in shape, and a generally rectangular central section 24 that interconnects the two end sections 20, 22 to result in a rounded, rectangular "lozenge" shape for the cutter 10.
- Figure 2 also illustrates the currently preferred dimensions for the cutter 10.
- the cutter 10 has an overall length 26, as measured from the tip of one semi-circular section 20 to the tip of the other semi-circular section 22.
- the cutter 10 also has a width 28 that extends from one lateral side of the central section 24 to the other. The width 28 is also equal to the diameter of the semi-circular end sections 20, 22.
- FIG. 3 depicts an alternative embodiment for a cutter 10' which is constructed in accordance with the present invention.
- the cutter 10' is similar to the cutter 10 described previously.
- the end sections 20' and 22' are arcuate, but not semi-circular.
- the end sections 20' and 22' instead, have an end wall 23' with a larger radius of curvature and, therefore, represents an arc segment that is less than a semi-circle.
- the length of the cutter 10' still exceeds the width of the cutter 10', and the preferred length-to-width ratios described above apply to this embodiment as well.
- Figure 4 illustrates an exemplary cutting arm, or cutting member, 30 having a raised cutting portion 32.
- the cutting arm 30 is of a type that is incorporated into a downhole cutter and used for rotary cutting into portions of the sidewall of a wellbore, as is known in the art.
- a plurality of prior art cutters 34 are affixed thereto having round-shaped cutting faces. It is noted that there is a significant amount of interstitial space 36 between the cutters 34 on the raised cutting portion 32. During downhole cutting or milling, the interstitial space 36 between the cutters 34 is highly susceptible to erosion damage. Particularly where the materials being milled or cut are highly ductile, such as those having high chrome and/or nickel content, the milled material tends to flow into the interstitial space 36 and erode away the arm 30. Also depicted in Figure 4 is a half cutter 34a which is used to help accommodate proper spacing with the other cutters 34 upon the raised cutting portion 32.
- FIG. 5 depicts an exemplary cutting arm 30 having a plurality of cutters 10 of the type described previously with respect to Figures 1 and 2 affixed thereupon, in accordance with the present invention.
- the use of the rounded, rectangular cutters 10 results in less interstitial space 36 available on the raised portion 32 and as a result, less erosion of the arm 30.
- the increased length 26 of the cutter 10 as compared to a cutter 34 means there is increased bond area between each cutter 10 and the arm 30 as compared to the prior art cutters 34. Cutters are typically affixed to a cutting arm by brazing and welding.
- FIG. 6 depicts an exemplary arm 50 for a mandrel cutting tool.
- the arm 50 includes a proximal portion 52 having a pin opening 54 into which the arm 50 is pivotally attached to a cutting tool mandrel (not shown) and a distal cutting portion 56.
- the distal cutting portion 56 which is more clearly depicted in the close up view of Figure 6A, includes a cutter retaining area 58 that is bounded by side surface 60 and shelf 62. Cutters 10 are accommodated inside the cutter retaining area 58 and leave very little interstitial space.
- FIG. 7 illustrates an exemplary rotary cutting mill 70 of the type used in sidetracking operations to mill a lateral opening in wellbore casing.
- Cutting mills of this type are generally known in the art, and include the SILVERBACKTM window mill available commercially from Baker Oil Tools of Houston, Texas.
- the cutting mill 70 has five cutting blades, or arms, 72 that are rotated about hub 74 during operation.
- Each of these blades 72 has cutters 10 mounted upon them. It is pointed out that the blades 72 may include some rounded, conventional cutters 34 as well. It is noted that the cutters 10, 34 are mounted upon the cutting blades 72 in a manner such that the cutters are offset from one another in adjacent blades 72.
- the distal tip of the edge of blade 72A has four cutters 10 that are arranged in an end-to-end manner.
- the neighboring blade 72B has the lead cutter 10A turned at a 90 degree angle to the other cutters 10, thereby causing the interstitial space 36 between the cutters 10, 10A, 34 to be staggered on adjacent blades 72.
- the blades 72 will become less worn in the interstitial spaces 36.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2007269124A AU2007269124B2 (en) | 2006-07-07 | 2007-07-05 | Cutters for downhole cutting devices |
GB0900556A GB2453472B (en) | 2006-07-07 | 2007-07-05 | Cutters for downhole cutting devices |
CA2657454A CA2657454C (en) | 2006-07-07 | 2007-07-05 | Cutters for downhole cutting devices |
NO20090187A NO340001B1 (en) | 2006-07-07 | 2009-01-13 | Cutters for use on a cutting arm for a well cutting device and cutting tools for use in well cutting |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/483,154 US7363992B2 (en) | 2006-07-07 | 2006-07-07 | Cutters for downhole cutting devices |
US11/483,154 | 2006-07-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008006010A2 true WO2008006010A2 (en) | 2008-01-10 |
WO2008006010A3 WO2008006010A3 (en) | 2008-05-08 |
Family
ID=38895460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/072811 WO2008006010A2 (en) | 2006-07-07 | 2007-07-05 | Cutters for downhole cutting devices |
Country Status (7)
Country | Link |
---|---|
US (1) | US7363992B2 (en) |
AU (1) | AU2007269124B2 (en) |
CA (1) | CA2657454C (en) |
GB (1) | GB2453472B (en) |
NO (1) | NO340001B1 (en) |
RU (1) | RU2403367C1 (en) |
WO (1) | WO2008006010A2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2440448B (en) * | 2006-07-24 | 2009-08-12 | Smith International | Cutter geometry for increased bit life and bits incorporating the same |
US8684112B2 (en) | 2010-04-23 | 2014-04-01 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements and related methods |
US9103174B2 (en) | 2011-04-22 | 2015-08-11 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements and related methods |
US9243452B2 (en) | 2011-04-22 | 2016-01-26 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and related methods |
US9482057B2 (en) | 2011-09-16 | 2016-11-01 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements and related methods |
US9650837B2 (en) | 2011-04-22 | 2017-05-16 | Baker Hughes Incorporated | Multi-chamfer cutting elements having a shaped cutting face and earth-boring tools including such cutting elements |
US9821437B2 (en) | 2012-05-01 | 2017-11-21 | Baker Hughes Incorporated | Earth-boring tools having cutting elements with cutting faces exhibiting multiple coefficients of friction, and related methods |
US10066442B2 (en) | 2012-05-01 | 2018-09-04 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and related methods |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050247486A1 (en) * | 2004-04-30 | 2005-11-10 | Smith International, Inc. | Modified cutters |
US8833492B2 (en) * | 2008-10-08 | 2014-09-16 | Smith International, Inc. | Cutters for fixed cutter bits |
US8087478B2 (en) * | 2009-06-05 | 2012-01-03 | Baker Hughes Incorporated | Cutting elements including cutting tables with shaped faces configured to provide continuous effective positive back rake angles, drill bits so equipped and methods of drilling |
US8887839B2 (en) * | 2009-06-25 | 2014-11-18 | Baker Hughes Incorporated | Drill bit for use in drilling subterranean formations |
EP2452037A2 (en) | 2009-07-08 | 2012-05-16 | Baker Hughes Incorporated | Cutting element for a drill bit used in drilling subterranean formations |
EP2452036A2 (en) | 2009-07-08 | 2012-05-16 | Baker Hughes Incorporated | Cutting element and method of forming thereof |
WO2011017115A2 (en) | 2009-07-27 | 2011-02-10 | Baker Hughes Incorporated | Abrasive article and method of forming |
US8689911B2 (en) * | 2009-08-07 | 2014-04-08 | Baker Hughes Incorporated | Cutter and cutting tool incorporating the same |
AU2010300374B2 (en) | 2009-10-01 | 2014-09-11 | Baker Hughes Incorporated | Milling tool for establishing openings in wellbore obstructions |
US8887838B2 (en) | 2010-02-05 | 2014-11-18 | Baker Hughes Incorporated | Cutting element and method of orienting |
US8997899B2 (en) | 2010-02-05 | 2015-04-07 | Baker Hughes Incorporated | Cutting element, cutter tool and method of cutting within a borehole |
SA111320374B1 (en) | 2010-04-14 | 2015-08-10 | بيكر هوغيس انكوبوريتد | Method Of Forming Polycrystalline Diamond From Derivatized Nanodiamond |
US8434572B2 (en) | 2010-06-24 | 2013-05-07 | Baker Hughes Incorporated | Cutting elements for downhole cutting tools |
US8936109B2 (en) * | 2010-06-24 | 2015-01-20 | Baker Hughes Incorporated | Cutting elements for cutting tools |
US8327957B2 (en) | 2010-06-24 | 2012-12-11 | Baker Hughes Incorporated | Downhole cutting tool having center beveled mill blade |
US8985246B2 (en) * | 2010-09-28 | 2015-03-24 | Baker Hughes Incorporated | Subterranean cutting tool structure tailored to intended use |
US9151120B2 (en) | 2012-06-04 | 2015-10-06 | Baker Hughes Incorporated | Face stabilized downhole cutting tool |
US9388639B2 (en) | 2012-10-26 | 2016-07-12 | Baker Hughes Incorporated | Rotatable cutting elements and related earth-boring tools and methods |
US9303461B2 (en) * | 2012-10-26 | 2016-04-05 | Baker Hughes Incorporated | Cutting elements having curved or annular configurations for earth-boring tools, earth-boring tools including such cutting elements, and related methods |
US9140072B2 (en) | 2013-02-28 | 2015-09-22 | Baker Hughes Incorporated | Cutting elements including non-planar interfaces, earth-boring tools including such cutting elements, and methods of forming cutting elements |
US10508503B2 (en) | 2016-09-23 | 2019-12-17 | Baker Hughes, A Ge Company, Llc | Cutting elements, earth-boring tools including the cutting elements, and methods of forming the earth-boring tools |
ZA201805937B (en) * | 2017-09-05 | 2019-06-26 | Smith International | Cutting elements having non-planar surfaces and tools incorporating the same |
CN111566308A (en) | 2018-12-06 | 2020-08-21 | 哈利伯顿能源服务公司 | Inside cutter for well drilling |
USD911399S1 (en) | 2018-12-06 | 2021-02-23 | Halliburton Energy Services, Inc. | Innermost cutter for a fixed-cutter drill bit |
US11578538B2 (en) * | 2020-01-09 | 2023-02-14 | Schlumberger Technology Corporation | Cutting element with nonplanar face to improve cutting efficiency and durability |
US11719050B2 (en) | 2021-06-16 | 2023-08-08 | Baker Hughes Oilfield Operations Llc | Cutting elements for earth-boring tools and related earth-boring tools and methods |
US11920409B2 (en) | 2022-07-05 | 2024-03-05 | Baker Hughes Oilfield Operations Llc | Cutting elements, earth-boring tools including the cutting elements, and methods of forming the earth-boring tools |
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US4928777A (en) * | 1984-12-22 | 1990-05-29 | Nl Petroleum Products Limited | Cutting elements for rotary drill bits |
WO1992014906A1 (en) * | 1991-02-23 | 1992-09-03 | Brit Bit Limited | Improvements relating to drill bits |
US5383527A (en) * | 1993-09-15 | 1995-01-24 | Smith International, Inc. | Asymmetrical PDC cutter |
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EP0918135A1 (en) * | 1997-11-20 | 1999-05-26 | General Electric Company | Polycrystalline diamond compact (pdc) cutter with improved cutting capability |
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US6394199B1 (en) * | 1999-10-05 | 2002-05-28 | Schlumberger Technology Corp. | Non-circular gauge reaming row inserts |
US20060032677A1 (en) * | 2003-02-12 | 2006-02-16 | Smith International, Inc. | Novel bits and cutting structures |
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US6561293B2 (en) * | 1997-09-04 | 2003-05-13 | Smith International, Inc. | Cutter element with non-linear, expanded crest |
CA2261495A1 (en) * | 1998-03-13 | 1999-09-13 | Praful C. Desai | Method for milling casing and drilling formation |
US6283234B1 (en) * | 1999-09-17 | 2001-09-04 | Sylvan Engineering Company | Apparatus for mounting PCD compacts |
US6843333B2 (en) * | 1999-11-29 | 2005-01-18 | Baker Hughes Incorporated | Impregnated rotary drag bit |
EP1190791B1 (en) * | 2000-09-20 | 2010-06-23 | Camco International (UK) Limited | Polycrystalline diamond cutters with working surfaces having varied wear resistance while maintaining impact strength |
CA2595048C (en) * | 2006-07-24 | 2013-09-03 | Smith International, Inc. | Cutter geometry for increased bit life and bits incorporating the same |
-
2006
- 2006-07-07 US US11/483,154 patent/US7363992B2/en active Active
-
2007
- 2007-07-05 WO PCT/US2007/072811 patent/WO2008006010A2/en active Application Filing
- 2007-07-05 RU RU2009103817/03A patent/RU2403367C1/en not_active IP Right Cessation
- 2007-07-05 CA CA2657454A patent/CA2657454C/en active Active
- 2007-07-05 AU AU2007269124A patent/AU2007269124B2/en active Active
- 2007-07-05 GB GB0900556A patent/GB2453472B/en active Active
-
2009
- 2009-01-13 NO NO20090187A patent/NO340001B1/en unknown
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US4928777A (en) * | 1984-12-22 | 1990-05-29 | Nl Petroleum Products Limited | Cutting elements for rotary drill bits |
WO1992014906A1 (en) * | 1991-02-23 | 1992-09-03 | Brit Bit Limited | Improvements relating to drill bits |
US5383527A (en) * | 1993-09-15 | 1995-01-24 | Smith International, Inc. | Asymmetrical PDC cutter |
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EP0853184A2 (en) * | 1997-01-14 | 1998-07-15 | Baker Hughes Incorporated | Superabrasive cutting element with enhanced stiffness, thermal conductivity and cutting efficency |
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Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8096372B2 (en) | 2006-07-24 | 2012-01-17 | Smith International, Inc. | Cutter geometry for increased bit life and bits incorporating the same |
GB2440448B (en) * | 2006-07-24 | 2009-08-12 | Smith International | Cutter geometry for increased bit life and bits incorporating the same |
US8684112B2 (en) | 2010-04-23 | 2014-04-01 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements and related methods |
US8919462B2 (en) | 2010-04-23 | 2014-12-30 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements and related methods |
US10006253B2 (en) | 2010-04-23 | 2018-06-26 | Baker Hughes Incorporated | Cutting elements for earth-boring tools and earth-boring tools including such cutting elements |
US10337255B2 (en) | 2011-04-22 | 2019-07-02 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and related methods |
US9103174B2 (en) | 2011-04-22 | 2015-08-11 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements and related methods |
US9243452B2 (en) | 2011-04-22 | 2016-01-26 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and related methods |
US10428591B2 (en) | 2011-04-22 | 2019-10-01 | Baker Hughes Incorporated | Structures for drilling a subterranean formation |
US9650837B2 (en) | 2011-04-22 | 2017-05-16 | Baker Hughes Incorporated | Multi-chamfer cutting elements having a shaped cutting face and earth-boring tools including such cutting elements |
US10385623B2 (en) | 2011-09-16 | 2019-08-20 | Baker Hughes, A Ge Company, Llc | Cutting elements for earth-boring tools and earth-boring tools including such cutting elements |
US10428590B2 (en) | 2011-09-16 | 2019-10-01 | Baker Hughes, A Ge Company, Llc | Cutting elements for earth-boring tools and earth-boring tools including such cutting elements |
US9482057B2 (en) | 2011-09-16 | 2016-11-01 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements and related methods |
US10066442B2 (en) | 2012-05-01 | 2018-09-04 | Baker Hughes Incorporated | Cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and related methods |
US9821437B2 (en) | 2012-05-01 | 2017-11-21 | Baker Hughes Incorporated | Earth-boring tools having cutting elements with cutting faces exhibiting multiple coefficients of friction, and related methods |
US11229989B2 (en) | 2012-05-01 | 2022-01-25 | Baker Hughes Holdings Llc | Methods of forming cutting elements with cutting faces exhibiting multiple coefficients of friction, and related methods |
Also Published As
Publication number | Publication date |
---|---|
CA2657454A1 (en) | 2008-01-10 |
AU2007269124A1 (en) | 2008-01-10 |
GB2453472A (en) | 2009-04-08 |
US20080006446A1 (en) | 2008-01-10 |
CA2657454C (en) | 2011-09-06 |
US7363992B2 (en) | 2008-04-29 |
RU2009103817A (en) | 2010-08-20 |
GB0900556D0 (en) | 2009-02-11 |
WO2008006010A3 (en) | 2008-05-08 |
NO340001B1 (en) | 2017-02-27 |
NO20090187L (en) | 2009-04-02 |
AU2007269124B2 (en) | 2011-07-21 |
RU2403367C1 (en) | 2010-11-10 |
GB2453472B (en) | 2011-05-25 |
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