US2813697A - Stabilizer for drill collars and drill pipes - Google Patents

Stabilizer for drill collars and drill pipes Download PDF

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US2813697A
US2813697A US361598A US36159853A US2813697A US 2813697 A US2813697 A US 2813697A US 361598 A US361598 A US 361598A US 36159853 A US36159853 A US 36159853A US 2813697 A US2813697 A US 2813697A
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stabilizer
drill
mandrel
reenforcement
shoulders
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US361598A
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Kenneth H Swart
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SECURITY ENGINEERING DIVISION
SECURITY ENGINEERING DIVISION DRESSER OPERATIONS Inc
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SECURITY ENGINEERING DIVISION
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    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1042—Elastomer protector or centering means
    • E21B17/105—Elastomer protector or centering means split type

Definitions

  • the drill collars are in the form of thick-walled tubular members designed to supply the desired amount of weight on the bit and to afford sufiicient stifiness to cause the bit to drill in a vertical direction despite deviating tendencies occasioned by various strata that are encountered.
  • the flexibility of the drill collars is such-that coupled with the flexibility of the drill pipe, the lower portion of the drilling string will tend to lean against a wall of the hole being drilled which affords an opportunity for the bit to deviate from the vertical.
  • An object of the present invention is to provide an improved stabilizer for drill collars and/or drill pipes wherein the stabilizer is in the form of a split sleeve, the two parts of which can be mutually assembled together about a drill collar and locked in position there on. This enables a single-piece mandrel or drill collar to be employed which can be of adequate strength.
  • the construction is also advantageous in that if a stabilizer becomes worn or damaged it may be disassembled and replaced at the well drilling rig.
  • Another object of the invention is to provide a stabilizer having the above-mentioned characteristics consisting of a single-piece mandrel or drill collar which is externally reduced between shoulders and which has the stabilizer in the form of a split sleeve assembled thereabouts.
  • This stabilizer has its parts in the form of a metallic reenforcement having rubber disposed on the exterior and interior thereof and bonded thereto. The rubber has an external diameter substantially equal to the gauge diameter of the bit that is being used so that it will be capable of holdingv the mandrel at substantially the center of the hole being drilled.
  • the metallic reenforcement is mainly disposed within the diameters of the shoulders so that if occasion should require washing over the mandrel to recover the mandrel and the balance of the drilling string therebelow, the rubber covering may be stripped down from the stabilizer and the metallic reenforcement will offer no serious impediment.
  • FIG. 1 is a vertical. section through a mandrel or drill collar illustrating a stabilizer embodying the present invention in applied position thereon. This view may be regarded as having been taken substantially upon the line 1-1 upon Fig. 2;
  • Fig. 2 is a horizontal section taken substantially upon the line 2-2 upon Fig. 1;
  • Fig. 3 is a partial view in vertical section taken substantially upon the line 3-3 upon Fig. 1.
  • 10 indicates a conventional drill collar adapted to be incorporated in and form a part of a rotary well drilling string.
  • This drill collar constitutes a tubular mandrel and differs from the conventional drill collar merely in having its exterior reduced in diameter as indicated at 11 between shoulders 12 and 13.
  • the mandrel or drill collar 10- may be a single unitary structure in that it is not made up of separate parts threaded or otherwise secured together. Consequently, despite the slight reduction in wall thickness between the shoulders 12 and 13 the mandrel may be adequately strong to resist stresses to which it may be subjected in the well.
  • the stabilizer consists of two opposed parts, generally indicated at 14 and 15. These parts are preferably identical and are of general semi-cylindrical configuration so that they may be mutually assembled together about the mandrel between the shoulders 12 and 13. Each part consists of a perforated metallic reenforcement 16 having a tongue 17 at one end and a socket 18 at the other that is complementary to the tongue so that it may receive the tongue of the opposed part. .
  • the socket may be formed of two opposed plates riveted as at 19 or otherwise secured to opposite sides of the reenforcement.
  • apertures 20 In the tongues and sockets there are apertures 20 that may be brought into mutual registration and these apertures are tapped while the two opposed parts of the stabilizer are in assembled relationship so that the threaded portions in the sockets and in the tongues will properly align to receive tapered screws 21.
  • the screws are preferably of the Allen set screw type.
  • the maximum diameter across the stabilizer is substantially equal to the gauge diameter of the bit that is being employed.
  • the external layers 22 are vertically fluted as indicated at 24-to provide for 3. the flow of circulation fluid about the stabilizer.
  • the internal layers 23 are vertically fluted as indicated at 25 so that there will be grooves or; spaces between the stabilizer andthe mandrel- 10. Li cuttings or abrasiveswork between the stabilizer and the; mandrel these. cuttings or abrasives will work into the. grooves 25: andmay be flushed out without damaging-either the mandrelor the stabilizer.
  • the two, opposed parts 14 and 15 are merely assembled: together about the mandrel between the shoulders Hand 13..
  • The. apertures are caused to align and the set screws- 21 are driven in position. These set screws are disposed well withinthe outside diameter across the stabilizer and are protected thereby. If the stabilizer should become Worn or damaged and itis desired to replace. the stabilizer, the set screws21 can be removed and. the parts 14 and 15 disassembled and replaced.
  • the washover tool may merely telescope downwardly over the mandrel and strip the outer rubber layers 22 from the stabilizer.
  • the metallic reenforcement at 16 being within the shoulders ofiers no impediment to such washover operations.
  • the sections of the stabilizer are not tightened or held in tight engagement withthe mandrel, it being the intention that the mandrel rotate within the stabilizer while the stabilizer may be frictionally held more or less stationary in the well.
  • a single-piece mandrel or drill collar may be employed of adequate weight and strength, and the parts of the stabilizer can be mutually assembled about the mandrel between shoulders thereon which are integral with the onc piece mandrel.
  • rubber does not necessarily refer to natural vulcanized rubber, but is intended to include synthetic rubbers and rubber-like compositions designed to withstand softening'under the temperature and pressure conditions existing in the usual Well.
  • the constructions herein disclosed may have any one of a number of dilferentstyles of clutches or releasable locksformed. between the bottom ofthe reenforcement of the stabilizer and the'mandrel 10.
  • The-frictional engage- 'ment between the exterior of the stabilizer and thewa-lls of the: well normally holds such clutch or lock out ofengagement so'that the mandrel can be rotated within the stabilizer.
  • the stabilizer may be positively locked against rotation relatively tothe mandrel andunder such circumstances, can be rotated forcibly by the mandrel.
  • a bit stabilizing means for rotary well'drilling strings comprising a one-piece drill collar section having its exterior of reduced diameter between upper and lower shoulders and having means at its ends providing for its incorporation in. a rotary well drilling string, a stabilizer formed of two opposed semi-cylindrically shaped parts applicable to the reduced portion between thev shoulders and occupying substantially all of the: space between the shoulders, each of. said parts comprising a semi-cylindrical,
  • relatively stiff reenforcement having means at its side edges engageable with the side edges of the reenforcement of the other part, said means comprising a tongue on the side edge of each reenforcement and a socket on the opposed side edge of the opposed reenforcement in which the tongue is receivable, there being apertures in each tongue and socket adapted to register with each other and which are arranged radially of the drill collar section, and screws receivable in said registering apertures and layers.
  • the exterior layer being of greater external diameter than the maximum diameter of the drill collar section and the interior diameter of the inner layer being such that the stabilizer is freeto rotate on the drill collar section between the shoulders as a cylinder.
  • A. bit stabilizing means for rotary well drilling strings comprising a one-piece drill collar section having its exterior of reduced diameter between upper and lower shoulders and having means at its ends providing for its incorporation in arotary well drilling string, a stabilizer formed of two opposed semi-cylindrically shaped parts applicable to the reduced portion between the shoulders and occupying substantially all of the space between the shoulders, each of said parts comprising a semi-cylindrical, relatively stiff reenforcement having means at its side edges engageable with the side edges of the reenforcement of the other'part, said means comprising a tongue on the side edge of each reenforcement and a socket on the opposed side edge of the opposed reenforcement in which the tongue is receivable, there being apertures in each tongue and socket adapted to register with each other and which are arranged, radially of the drill collar section, screws receivable in said registering apertures, and layers of rubber on the interior and exterior of the reenforcement, the exteriorlayer being of greater external diameter than the
  • A- bit stabilizing means for rotary well drilling strings comprising a one-piece drill collar section having its exterior of reduced diameter between upper and lower shoulders and having means at its endsproviding for its incorporation in a rotary well drilling string, a stabilizer formed of two opposed semi-cylindrioally shaped parts applicable to the reduced portion between the shoulders and occupying substantially all of the space between the shoulders, eachof said'parts comprising a semi-cylindrical, relatively stiff reenforcement having means at its side edges engageable with the side edges of the reenforcement of the other part, said means comprising a tongue on the side edge of-each reenforcement and a socket on the opposed side edge of the opposed reenforcement inwhich the tongue is receivable, there being apertures in each tongue and socket adapted to register with each other and which are arranged radially of the drill collarsection, screwsreceivable in said registering apertures, and layers of rubber on the interior and exterior of the reenforcement, the exterior
  • a bit stabilizer comprising twosemi-cylindrical parts adapted'to' be assembled about a mandrel incorporatedin a: drilling: string, each part comprising a semi-cylindrical metallic reenforcement having a circumferentially extending tongue at one end and a complementary circumferentially' open.
  • socket adjacent the other adapted to receive the tongue of the other part, there being radially arranged aperturesin, the'tongues: and sockets adapted to register when the tongues are in the sockets, screws receivable in the aperatures, and layers of vertically fluted rubber on the inside and outside of the reenforcement, the outer layer extending radially outward beyond the tongues and sockets and screws and the inner layer extending radially inward beyond the tongues, sockets and screws.
  • a bit stabilizer comprising two semi-cylindrical parts adapted to be assembled about a mandrel incorporated in a drilling string, each part comprising a semi-cylindrical metallic reenforcement having portions at the sides thereof disposed in overlapping relation to portions of the other part, there being radially arranged apertures in the overlapping portions of said parts adapted to register, radially arranged threaded fasteners receivable in the apertures, and layers of vertically fluted rubber on the inside and outside of the reenforcement, the outer layer extending radially outward beyond the threaded fasteners and the inner layer extending radially inward beyond the inner ends of the threaded fasteners.

Description

Nov. 19, 1957 K. H. SWART STABILIZER FOR DRILL COLLARS AND DRILL PIPES Filed June 15 1953 IN V EN TOR.
nrraeuws United States Patent STABILIZER FOR DRILL COLLARS AND DRILL PIPES Kenneth H. Swart, Whittier, Calif., assignor to Security Engineering Division, Dresser Operations, Inc., Whattier, Calil:., a corporation of California Application June 15, 1953, Serial No. 361,598
Claims. (Cl. 25528) The drill collars are in the form of thick-walled tubular members designed to supply the desired amount of weight on the bit and to afford sufiicient stifiness to cause the bit to drill in a vertical direction despite deviating tendencies occasioned by various strata that are encountered. Despite the thick walls and the stiifness of the drill collars, the flexibility of the drill collars is such-that coupled with the flexibility of the drill pipe, the lower portion of the drilling string will tend to lean against a wall of the hole being drilled which affords an opportunity for the bit to deviate from the vertical.
It has heretofore been proposed to hold the drill collars and/or drill pipe centrally of the hole to avoid this deviation. In so doing, reamers have been incorporated in the drill string a short distance above thesition thereon. The construction of such special drill collars made up of two or more parts is objectionable not only from the standpoint of expense, but also from the standpoint of weakening the structure of the drill collar.
An object of the present invention is to provide an improved stabilizer for drill collars and/or drill pipes wherein the stabilizer is in the form of a split sleeve, the two parts of which can be mutually assembled together about a drill collar and locked in position there on. This enables a single-piece mandrel or drill collar to be employed which can be of adequate strength. The construction is also advantageous in that if a stabilizer becomes worn or damaged it may be disassembled and replaced at the well drilling rig.
Another object of the invention is to provide a stabilizer having the above-mentioned characteristics consisting of a single-piece mandrel or drill collar which is externally reduced between shoulders and which has the stabilizer in the form of a split sleeve assembled thereabouts. This stabilizer has its parts in the form of a metallic reenforcement having rubber disposed on the exterior and interior thereof and bonded thereto. The rubber has an external diameter substantially equal to the gauge diameter of the bit that is being used so that it will be capable of holdingv the mandrel at substantially the center of the hole being drilled. It is externally fluted to provide for the passage of circulation fluid and is preferably internally fluted so that cuttings and abrasives cannot become lodged between the stabilizer and the mandrel and damage the stabilizer or the mandrel. The metallic reenforcement is mainly disposed within the diameters of the shoulders so that if occasion should require washing over the mandrel to recover the mandrel and the balance of the drilling string therebelow, the rubber covering may be stripped down from the stabilizer and the metallic reenforcement will offer no serious impediment. 1
With the foregoing and other objects in View, which will be made manifest in the following detailed description and specifically pointed out in the appended claims, reference is had to the accompanying drawings for an illustrative embodiment of the invention, wherein:
j Figure 1 is a vertical. section through a mandrel or drill collar illustrating a stabilizer embodying the present invention in applied position thereon. This view may be regarded as having been taken substantially upon the line 1-1 upon Fig. 2;
Fig. 2 is a horizontal section taken substantially upon the line 2-2 upon Fig. 1;
Fig. 3 is a partial view in vertical section taken substantially upon the line 3-3 upon Fig. 1.
Referring to the accompanying drawings wherein similar reference characters designate'similar parts throughout, 10 indicates a conventional drill collar adapted to be incorporated in and form a part of a rotary well drilling string. This drill collar constitutes a tubular mandrel and differs from the conventional drill collar merely in having its exterior reduced in diameter as indicated at 11 between shoulders 12 and 13. As will be observed from the drawing, the mandrel or drill collar 10-may be a single unitary structure in that it is not made up of separate parts threaded or otherwise secured together. Consequently, despite the slight reduction in wall thickness between the shoulders 12 and 13 the mandrel may be adequately strong to resist stresses to which it may be subjected in the well.
The stabilizer consists of two opposed parts, generally indicated at 14 and 15. These parts are preferably identical and are of general semi-cylindrical configuration so that they may be mutually assembled together about the mandrel between the shoulders 12 and 13. Each part consists of a perforated metallic reenforcement 16 having a tongue 17 at one end and a socket 18 at the other that is complementary to the tongue so that it may receive the tongue of the opposed part. .The socket may be formed of two opposed plates riveted as at 19 or otherwise secured to opposite sides of the reenforcement. In the tongues and sockets there are apertures 20 that may be brought into mutual registration and these apertures are tapped while the two opposed parts of the stabilizer are in assembled relationship so that the threaded portions in the sockets and in the tongues will properly align to receive tapered screws 21. The screws are preferably of the Allen set screw type. On the exteriors of the reenforcements 16 there are layers of rubber 22, and similarly on the interiors of the reenforcements there are layers of rubber 23. These layers of rubber are bonded to the metal reenforcements and are mutually connected through the perforations of the reenforcements. The maximum diameter across the stabilizer is substantially equal to the gauge diameter of the bit that is being employed. It may be, however, a slight amount smaller so that the stabilizer will'not engage the walls of the well with a tight fit in the event that the bit wears out of gauge. The external layers 22 are vertically fluted as indicated at 24-to provide for 3. the flow of circulation fluid about the stabilizer. In a similar manner, the internal layers 23 are vertically fluted as indicated at 25 so that there will be grooves or; spaces between the stabilizer andthe mandrel- 10. Li cuttings or abrasiveswork between the stabilizer and the; mandrel these. cuttings or abrasives will work into the. grooves 25: andmay be flushed out without damaging-either the mandrelor the stabilizer.
When it is desiredto: apply the stabilizer to the mandrel the two, opposed parts 14 and 15 are merely assembled: together about the mandrel between the shoulders Hand 13.. The. apertures are caused to align and the set screws- 21 are driven in position. These set screws are disposed well withinthe outside diameter across the stabilizer and are protected thereby. If the stabilizer should become Worn or damaged and itis desired to replace. the stabilizer, the set screws21 can be removed and. the parts 14 and 15 disassembled and replaced.
As will be noted from an inspection of Fig. l, the outside diameter of thereenforcement 16. does not materially project beyond the diameters of, the shoulders 12 and 13.
Consequently, if at any time it should be necessary to wash over the, mandrel to recover a lost portion of the drilling. string the washover tool may merely telescope downwardly over the mandrel and strip the outer rubber layers 22 from the stabilizer. The metallic reenforcement at 16 being within the shoulders ofiers no impediment to such washover operations.
The sections of the stabilizer are not tightened or held in tight engagement withthe mandrel, it being the intention that the mandrel rotate within the stabilizer while the stabilizer may be frictionally held more or less stationary in the well. In the construction above described, a single-piece mandrel or drill collar may be employed of adequate weight and strength, and the parts of the stabilizer can be mutually assembled about the mandrel between shoulders thereon which are integral with the onc piece mandrel.
The term rubber" as herein used does not necessarily refer to natural vulcanized rubber, but is intended to include synthetic rubbers and rubber-like compositions designed to withstand softening'under the temperature and pressure conditions existing in the usual Well.
The constructions herein disclosed may have any one of a number of dilferentstyles of clutches or releasable locksformed. between the bottom ofthe reenforcement of the stabilizer and the'mandrel 10. The-frictional engage- 'ment between the exterior of the stabilizer and thewa-lls of the: well normally holds such clutch or lock out ofengagement so'that the mandrel can be rotated within the stabilizer. However, should the stabilizer become stuck in the well, on: lifting the mandrel the stabilizer may be positively locked against rotation relatively tothe mandrel andunder such circumstances, can be rotated forcibly by the mandrel. Also, if occasion should require drilling downwardly or milling over the mandrel the drilling tool or milling tool on engagement with the top of. the stabilizer will force. it downwardly relatively to the mandrel,.causing the clutch or lock to engage and thus hold the stabilizer against rotation relatively to the mandrel. Such locks or clutches have not been illustrated herein as they have heretofore been employed on drill pipe stabilizers.
Various changes may be made in the details of construction without departing from the spirit and scope of the invention as defined by the appended claims.
I claim:
1. A bit stabilizing means for rotary well'drilling strings comprising a one-piece drill collar section having its exterior of reduced diameter between upper and lower shoulders and having means at its ends providing for its incorporation in. a rotary well drilling string, a stabilizer formed of two opposed semi-cylindrically shaped parts applicable to the reduced portion between thev shoulders and occupying substantially all of the: space between the shoulders, each of. said parts comprising a semi-cylindrical,
relatively stiff reenforcement having means at its side edges engageable with the side edges of the reenforcement of the other part, said means comprising a tongue on the side edge of each reenforcement and a socket on the opposed side edge of the opposed reenforcement in which the tongue is receivable, there being apertures in each tongue and socket adapted to register with each other and which are arranged radially of the drill collar section, and screws receivable in said registering apertures and layers. of rubber on the interior and exterior of the reentorcement, the exterior layer being of greater external diameter than the maximum diameter of the drill collar section and the interior diameter of the inner layer being such that the stabilizer is freeto rotate on the drill collar section between the shoulders as a cylinder.
2. A. bit stabilizing means for rotary well drilling strings comprising a one-piece drill collar section having its exterior of reduced diameter between upper and lower shoulders and having means at its ends providing for its incorporation in arotary well drilling string, a stabilizer formed of two opposed semi-cylindrically shaped parts applicable to the reduced portion between the shoulders and occupying substantially all of the space between the shoulders, each of said parts comprising a semi-cylindrical, relatively stiff reenforcement having means at its side edges engageable with the side edges of the reenforcement of the other'part, said means comprising a tongue on the side edge of each reenforcement and a socket on the opposed side edge of the opposed reenforcement in which the tongue is receivable, there being apertures in each tongue and socket adapted to register with each other and which are arranged, radially of the drill collar section, screws receivable in said registering apertures, and layers of rubber on the interior and exterior of the reenforcement, the exteriorlayer being of greater external diameter than themaximum diameter of the drill collar section and the interior diameter of the inner layer being such that the stabilizer is free to rotate on the drill collar section between the shoulders as a cylinder, the exterior and interior surfaces of the stabilizer being vertically fluted.
3. A- bit stabilizing means for rotary well drilling strings comprising a one-piece drill collar section having its exterior of reduced diameter between upper and lower shoulders and having means at its endsproviding for its incorporation in a rotary well drilling string, a stabilizer formed of two opposed semi-cylindrioally shaped parts applicable to the reduced portion between the shoulders and occupying substantially all of the space between the shoulders, eachof said'parts comprising a semi-cylindrical, relatively stiff reenforcement having means at its side edges engageable with the side edges of the reenforcement of the other part, said means comprising a tongue on the side edge of-each reenforcement and a socket on the opposed side edge of the opposed reenforcement inwhich the tongue is receivable, there being apertures in each tongue and socket adapted to register with each other and which are arranged radially of the drill collarsection, screwsreceivable in said registering apertures, and layers of rubber on the interior and exterior of the reenforcement, the exterior layer being; of greater external diameter than the, maximum diameter of the drill collar section and the interior diameter of the inner layer being such that the stabilizer isfree to rotate on the drill collar section between the shoulders as a cylinder, the exterior and interior surfaces of the stabilizer being vertically fluted, the diameter of the reenforcement being no greater than the maximum diameter of the drill collar section.
4". A bit stabilizer comprising twosemi-cylindrical parts adapted'to' be assembled about a mandrel incorporatedin a: drilling: string, each part comprising a semi-cylindrical metallic reenforcement having a circumferentially extending tongue at one end and a complementary circumferentially' open. socket adjacent the other adapted to receive the tongue of the other part, there being radially arranged aperturesin, the'tongues: and sockets adapted to register when the tongues are in the sockets, screws receivable in the aperatures, and layers of vertically fluted rubber on the inside and outside of the reenforcement, the outer layer extending radially outward beyond the tongues and sockets and screws and the inner layer extending radially inward beyond the tongues, sockets and screws.
5. A bit stabilizer comprising two semi-cylindrical parts adapted to be assembled about a mandrel incorporated in a drilling string, each part comprising a semi-cylindrical metallic reenforcement having portions at the sides thereof disposed in overlapping relation to portions of the other part, there being radially arranged apertures in the overlapping portions of said parts adapted to register, radially arranged threaded fasteners receivable in the apertures, and layers of vertically fluted rubber on the inside and outside of the reenforcement, the outer layer extending radially outward beyond the threaded fasteners and the inner layer extending radially inward beyond the inner ends of the threaded fasteners.
References Cited in the file of this patent UNITED STATES PATENTS Dennie Nov. 29, 1932 Osborne May 23, 1933 Williams July 10, 1934 Holt et a1 May 28, 1935 Moffitt June 11, 1935 Miller Aug. 9, 1938 Kellegrew Oct. 24, 1939 Smith Apr. 16, 1940 Fabrin Oct. 29, 1940 Smith Aug. 5, 1941 Brown et a1 Oct. 23, 1951 Medearis Apr. 28, 1953 Scott et al. June 2, 1953 Williams et al Oct. 27, 1953
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Cited By (22)

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US2944608A (en) * 1958-03-25 1960-07-12 Robbins & Myers Centralizing spider for wells
DE1110107B (en) * 1958-07-11 1961-07-06 Drilco Oil Tools Inc Collar guide sleeve
US3079998A (en) * 1957-06-15 1963-03-05 Franz G Reuter Scraper
US3125382A (en) * 1964-03-17 Well tools
US3197262A (en) * 1962-11-05 1965-07-27 Byrl R Fairchild Pipe protector
US3220810A (en) * 1962-05-03 1965-11-30 Merit Products Inc Flap-type abrasive wheel
US3227498A (en) * 1963-04-03 1966-01-04 Grant Oil Tool Company Drill pipe protector
US3397017A (en) * 1966-02-21 1968-08-13 Byron Jackson Inc Non-rotating drill pipe protector
US3410613A (en) * 1966-05-25 1968-11-12 Byron Jackson Inc Non-rotating single-collar drill pipe protector
US3447839A (en) * 1967-01-09 1969-06-03 Albert H Salvatori Welded drill blade stabilizer
US3675728A (en) * 1970-09-18 1972-07-11 Atlantic Richfield Co Slim hole drilling
US3963075A (en) * 1975-03-27 1976-06-15 Evans Orde R Centralizer for elastomer coated blast joint
US4275935A (en) * 1979-07-17 1981-06-30 American Coldset Corp. Drilling stabilizer
EP0140311A1 (en) * 1983-10-24 1985-05-08 Dailey Petroleum Services Corp. Apparatus for reducing friction between rotating drill pipe and the well bore
US5363931A (en) * 1993-07-07 1994-11-15 Schlumberger Technology Corporation Drilling stabilizer
US5631563A (en) * 1994-12-20 1997-05-20 Schlumbreger Technology Corporation Resistivity antenna shield, wear band and stabilizer assembly for measuring-while-drilling tool
US5833018A (en) * 1996-12-20 1998-11-10 Pegasus International Inc. Drill pipe/casing protector
US5833019A (en) * 1996-11-27 1998-11-10 Pegasus International Inc. Pipe protector
US7048064B1 (en) * 2003-09-12 2006-05-23 Smith Larry W Multi-unit centralizer
US8770318B2 (en) 2010-04-01 2014-07-08 National Oilwell Varco, L.P. Drilling motor with a locking collet sleeve stabilizer
US9328603B2 (en) 2013-11-12 2016-05-03 Hunting Energy Services, Inc. Method and apparatus for protecting downhole components from shock and vibration
US11352840B2 (en) 2017-08-01 2022-06-07 Frank's International, Llc Drill pipe torque reducer and method

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US2002893A (en) * 1933-05-19 1935-05-28 Charles K Holt Drill pipe protector
US2004506A (en) * 1934-03-06 1935-06-11 Goodrich Co B F Resilient shaft journal and bearing therefor
US2126405A (en) * 1935-07-08 1938-08-09 Miller Henry Clay Weaver Protective device for drill pipes
US2197531A (en) * 1938-01-12 1940-04-16 Walter G L Smith Drill pipe protector
US2177300A (en) * 1938-10-25 1939-10-24 Ingersoll Rand Co Guide for drill steels
US2219519A (en) * 1939-08-28 1940-10-29 Layne And Bowler Inc Rubber bearing
US2251428A (en) * 1939-12-23 1941-08-05 Walter G L Smith Drill pipe protector
US2572307A (en) * 1946-09-09 1951-10-23 Cicero C Brown Rotary drill stabilizer
US2640735A (en) * 1947-02-17 1953-06-02 Hughes Tool Co Stabilizer for drill collars and drill pipe
US2636787A (en) * 1948-09-18 1953-04-28 James F Medearis Casing protector
US2657101A (en) * 1951-11-02 1953-10-27 Ventura Tool Company Protective collar for drill pipes

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125382A (en) * 1964-03-17 Well tools
US3079998A (en) * 1957-06-15 1963-03-05 Franz G Reuter Scraper
US2944608A (en) * 1958-03-25 1960-07-12 Robbins & Myers Centralizing spider for wells
DE1110107B (en) * 1958-07-11 1961-07-06 Drilco Oil Tools Inc Collar guide sleeve
US3220810A (en) * 1962-05-03 1965-11-30 Merit Products Inc Flap-type abrasive wheel
US3197262A (en) * 1962-11-05 1965-07-27 Byrl R Fairchild Pipe protector
US3227498A (en) * 1963-04-03 1966-01-04 Grant Oil Tool Company Drill pipe protector
US3397017A (en) * 1966-02-21 1968-08-13 Byron Jackson Inc Non-rotating drill pipe protector
DE1291304B (en) * 1966-02-21 1969-03-27 Byron Jackson Inc Non-circumferential, tubular drill rod protector
US3410613A (en) * 1966-05-25 1968-11-12 Byron Jackson Inc Non-rotating single-collar drill pipe protector
DE1299582B (en) * 1966-05-25 1969-07-24 Byron Jackson Inc Non-circumferential wear protection for drill pipes
US3447839A (en) * 1967-01-09 1969-06-03 Albert H Salvatori Welded drill blade stabilizer
US3675728A (en) * 1970-09-18 1972-07-11 Atlantic Richfield Co Slim hole drilling
US3963075A (en) * 1975-03-27 1976-06-15 Evans Orde R Centralizer for elastomer coated blast joint
US4275935A (en) * 1979-07-17 1981-06-30 American Coldset Corp. Drilling stabilizer
EP0140311A1 (en) * 1983-10-24 1985-05-08 Dailey Petroleum Services Corp. Apparatus for reducing friction between rotating drill pipe and the well bore
US5363931A (en) * 1993-07-07 1994-11-15 Schlumberger Technology Corporation Drilling stabilizer
EP0633388A2 (en) 1993-07-07 1995-01-11 Services Petroliers Schlumberger Drilling stabilizer
US5631563A (en) * 1994-12-20 1997-05-20 Schlumbreger Technology Corporation Resistivity antenna shield, wear band and stabilizer assembly for measuring-while-drilling tool
US5833019A (en) * 1996-11-27 1998-11-10 Pegasus International Inc. Pipe protector
US5833018A (en) * 1996-12-20 1998-11-10 Pegasus International Inc. Drill pipe/casing protector
US7048064B1 (en) * 2003-09-12 2006-05-23 Smith Larry W Multi-unit centralizer
US8770318B2 (en) 2010-04-01 2014-07-08 National Oilwell Varco, L.P. Drilling motor with a locking collet sleeve stabilizer
US9328603B2 (en) 2013-11-12 2016-05-03 Hunting Energy Services, Inc. Method and apparatus for protecting downhole components from shock and vibration
US11352840B2 (en) 2017-08-01 2022-06-07 Frank's International, Llc Drill pipe torque reducer and method

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