US2877988A - Drill bit with driven auxiliary bit - Google Patents

Drill bit with driven auxiliary bit Download PDF

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US2877988A
US2877988A US656963A US65696357A US2877988A US 2877988 A US2877988 A US 2877988A US 656963 A US656963 A US 656963A US 65696357 A US65696357 A US 65696357A US 2877988 A US2877988 A US 2877988A
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drill bit
main
bit
auxiliary
sleeve
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US656963A
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Harry M Cameron
Eugene S Wassel
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American Coldset Corp
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American Coldset Corp
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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
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/14—Roller bits combined with non-rolling cutters other than of leading-portion type
    • 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
    • E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
    • 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/006—Mechanical motion converting means, e.g. reduction gearings

Definitions

  • Objects and features of this in'verition are the provision of drill bit construction intended to provide substantial cutting velocities to diamonds at all radial positions relative toith'e of the main drill bit.
  • a I I In an embodiment of the invention as herein contemplated; this is accomplished by incorporatingan auxiliary drill bit in the main drill bit body whose Cutting surface protrudes slightly from the cutting surface of the main drill bit to compensate for wear and manufacturing tolerances under action of a Belleville or rinfg spring whosethrust is equivalent to the minimum thrust desired in a single bit of equivalent diameter.
  • This auxil'iary bit is keyed to a pinion which engagesa ring gearcar'ried by a free sleeve surrounding the main drill bit.
  • a series of star wheels mounted on the sleeve serve to' cut keyway intothe wall of the hole b eifig dlil i d and to prevent rotation of the sleeve and also of the ring. gear.
  • the diameter of the auxiliary drill bit is in excess of the radius of the main drill bit so that diamonds in the. auxiliary bit lying at the geometric center of the main drill bit have a positiv'e velocity imparted to them during drilling operations by reason of the positive rotation given to the auxiliary drillbit and also because of the eccentricity of the .axisof the latter relative to the main drill bit.
  • drilling of the hole is speeded because positive cutting action of andiamonds occurs.
  • Figure l is a longitudinal section of a device embodying the invention taken along line 11 of Figure 4;
  • I Figure 2 is a transverse section taken along line 22 of Figure Figure 3 is a transverse section taken along line 33 of Figure 1; and
  • Figure 4 is a bottom end elevation of the device.
  • the reference character 10 generally denotes a rock drilling bit embodying the invention.
  • This bit 10 includes a main bit body 11 which is threadedly engaged at 12 with an attaching shank 13 whose outer end 14 is threaded for conventional attachment to a drill string (not shown).
  • the bit body 11 and its shank 13 respectively in their upper and lower portions are surrounded by an annular sleeve 15 which freely is rotatable relative to bothv as on thrustand radial ball bearings 16.
  • Other types of bearings may be used.
  • Longitudinal extending slots or grooves 17 are provided at equi-spaced positions on, the periphery of the sleeve 15 and each serves to receive a series of rotatable star wheels 18, 19, 20 respectively supported on the shafts 21, 22 and 23 which transversely span the slots or grooves 17.
  • the star wheels 18, 19 and 20" each project outwardly of theperipheral surface of the sleeve 15 but are of progressively decreasing diameter downwardly for purposes presently to be described.
  • a ring gear 24 is fixedly supported in a recess 25 provided at one end of the sleeve 15 for purposes presently is be described.
  • Diamond abrading surfaces 26 and 27 of conventional types are provided at the drilling end of main bit body 11'. Grooves 28 and 29 in these surfaces communicate with water passageway 30 in the bit body 11. This passageway 30 in turn is in communication with the main water passageway 31 inthe shank 13 to provide for flushing out of cut rock particles and for heat dissipation.
  • the main bit body 11 is provided with a longitudinally extending recess 32 located eccentri cally relative to its axis or center for receiving an auxiliary drill bit body 33.
  • This auxiliary bit body 33 is supported within the recess 32 as by the radial and thrust anti-friction ball bearings 34 and 35 and the nut 36 which threa dedl y engages the inner threaded end 37 arms shaft portion 38 of the auxiliary bit body 33.
  • Other types of bearings maybe used.
  • the outer end portions of the body 33 are provided with an abrading surface 39 which isspr'ing loaded axially and maintained slightly protrudant as at the distance d below the lower abradingsurface 26 of the main bit body 11 as by a conventional Belleville or ring type spring 40 in order to compensate for bearing and diamond means and manufacturing tolerances.
  • a gear 41 is keyed to shaft portion 38 of auxiliary bit body 33 and meshes with the sleeve mounted ring gear 24 so that positive drive will be irnpartedto the gear 41 and consequently to auxiliary bit 33 when ring gear 24 is held against rotation during driven rotation of the main bit body 11 as will be presently described.
  • auxiliary bit body 32 The abrading surface 39 of auxiliary bit body 32 is grooved at 42. These grooves communicate with a water passageway 43 which in turn is in open communication with main water passageway 31 in the shank 13for particle flushing and for heat dissipation.
  • the auxiliary drill bit 33 at its abrading surface 39 overlaps the geometric center of the main bit body so that rotation of the main and auxiliary drill bit bodies will provide a substantial cutting velocity to the abrading surfaces even at the geometric center of the main bit body.
  • the main drill bit body 11 and its shank 13 are separate being joined at'tlie threaded joint 12 so that the auxiliary bit body 33 may be secured in the main bit body 11 by the nut 36 prior to the threaded joining at 12 of the main bit body 11 and its shank portion 13.
  • radial pins 44 serve to prevent unscrewing ofthe parts atsaid threaded joint 1-2.
  • the ring gear 24 for assembly is constructed in sections and secured to the sleeve as by bolts or pins 45.
  • Additional fluid passageways 46 extending radially from the main water passageway 31 into the star wheel containing grooves or recesses 17 and additional fluid passageways 47 extending from fluid passageway 30 to the chamber 32 containing the gears 24 and 41 provide pressurized areas into which rock laden return mud incidental to drilling and which is under low pressure cannot enter. Thus chances of jamming the gears by rock particles is minimized.
  • star wheels have been described as a means for preventing rotation of the sleeve 15, other appropriate means may be utilized.
  • solid metal inserts may be carried in the groove their outwardly projecting surfaces being shaped to effect breaching of a keyway inthe wall.
  • Other means of preventing rotation of the sleeve 15 while permitting free vertical motion thereof likewise are possible and are contemplated.
  • the diameter of the auxiliarybit need not exceed the radius of the main drill bit. It is sulficient if its periphery overlaps the center line of the main bit and for this purpose its diameter can have any selected value either less than or in excess of the main bit radius,
  • a main drill bit having an abrading surface
  • a rotatable auxiliary drill bit having an abrading surface
  • a rotatable sleeve carried by said main drill bit, means for rotatably connecting said sleeve to said main drill bit, a ring gear secured to said sleeve, a pinion meshing with said ring gear and keyed to said rotatable auxiliary drill bit, and means extending from said sleeve for engaging the wall of a hole being drilled to prevent rotation of said sleeve and ring gear during drilling rotation of said main drill bit and thereby cause positive rotation of the pinion and of the auxiliary drill bit.
  • a main drill bit having an abrading surface
  • a rotatable auxiliary drill bit having an abrading surface
  • bearing means for supporting the auxiliary drill bit within said main drill bit whereby the said abrading surfaces will operate generally within the same plane
  • a rotatable sleeve carried by said main drill bit, means for rotatably connecting said sleeve to said main drill bit, a ring gear secured to said sleeve, a pinion keyed to said auxiliary drill bit and meshing with said ring gear
  • star wheel means mounted on said sleeve and projecting outwardly of its periphery for engaging the wall of a hole being drilled and cutting a keyway therein, engagement of said star wheels in the keyway preventing rotation of said sleeve and ring gear during drilling rotation of said main drill bit and thereby causing positive rotation of the pinion and auxiliary drill bit in opposite direction to the rotary direction of the main drill bit.
  • a main drill bit having an abrading surface
  • a rotatable auxiliary drill bit having an abrading surface
  • a rotatable sleeve carried by said main drill bit, means for rotatably connecting said sleeve to said main drill bit, a ring gear secured to said sleeve, a pinion meshing with said ring gear and keyed to said rotatable auxiliary drill bit, means extending from said sleeve for cutting a ,keyway into the wall of a hole being drilled and to prevent rotation of said sleeve and ring gear during drilling rotation of said main drill bit, thereby causing positive oppositely directed drilling rotation to said auxiliary. drill bit, and said bits having passages for distributionof water to their drilling surfaces and the said ring'gear for prevention of jamming of said gear and pinion by rock particles
  • a mam drill bit connected to said drill string and having an abrading surface, a free sleeve annularly disposed around said main drill bit, means for rotatably connecting said free sleeve to said main drill bit, a ring gear interior of said free sleeve. and attached thereto, a rotatable auxiliary bit having an abrading surface, means for supporting said auxiliary drill bit within said main drill bit whereby its abrading surface operates generally within the plane of said abrading surface of.
  • a main drill bit connected to said drill string and having an abrading surface, a free sleeve annularly disposed around said main .drillbit, means for rotatably connecting said free sleeve to said main drill bit, a ring gear interior.
  • a rotatable auxiliary bit having an abrading surface
  • a pinion attached to said auxiliary drill bit and meshing with said ring gear spring means between said auxiliary drill bit and-said main drill bit for assuring a minimum of positive downward thrust of said auxiliary drill bit
  • star wheel means mounted on said free sleeve to project outwardly therefrom for engaging a wall portion of a hole being drilled to prevent rotation of said free sleeve and said ring gear during drilling rotation of said main drill bit and thereby cause positive rotation of said pinion and of said auxiliary drill bit.
  • a main drill bit connected to said drill string and having an abrading surface, a free sleeve annularly disposed around said main drill bit, means for rotatably connecting said free sleeve to said main drill bit, a ring gear interior of said free sleeve and attached thereto, a rotatable auxiliary bit .5 abrading surface operates generally within the plane of said abrading surface of the main drill bit, a pinion attached to said auxiliary drill bit and meshing with said ring gear, spring means between said auxiliary drill bit and said main drill bit for assuring a minimum of positive downward thrust of said auxiliary drill bit, and means extending outwardly of said free sleeve and connected thereto for engaging a wall portion of a hole being drilled to prevent rotation of said free sleeve and said ring gear during drilling rotation of said main drill bit and thereby cause positive rotation of said pinion and of said auxiliary 6 drill bit, both the said drill bits having passages for

Description

March 17, 1959 H. M. CAMERON ETAL 2,877,988
DRILL BIT WITH DRIVEN AUXILIARY BIT I Filed May '5, 1957 INVENTOR5 v Harrg M, Carney-on. BYEU9 55, LUcudAlei fi y M ATTORN 5 M L-W FE.
52355642 39 a 2B If a i.
United States Patent i American Coldset Corporation, Paterson, N. J., a corporation of New Jersey Application May 3, 1957, Serial No. 656,963 6 Claims. (or. 255-401 This invention relates to rock drill bits and more pa ticularly to diamond drill bits of this character intended to provide a substantial velocity to all of the abrading surfaces with respect to the rock surfaces theyare intended to cut as by providing a positively driven auxiliary drill bit within a main drill bit body. I a I c I In conventional drill bits, the cuttin'g v eloci ty of each diamond in the drilling surface is directly proportional to the radius at which it is positioned so that at zero radius, normally the axis of the drill, the velocity is also zero and little, if any, cutting occurs.
Objects and features of this in'veritionare the provision of drill bit construction intended to provide substantial cutting velocities to diamonds at all radial positions relative toith'e of the main drill bit. a I I In an embodiment of the invention as herein contemplated; this is accomplished by incorporatingan auxiliary drill bit in the main drill bit body whose Cutting surface protrudes slightly from the cutting surface of the main drill bit to compensate for wear and manufacturing tolerances under action of a Belleville or rinfg spring whosethrust is equivalent to the minimum thrust desired in a single bit of equivalent diameter. This auxil'iary bit is keyed to a pinion which engagesa ring gearcar'ried by a free sleeve surrounding the main drill bit. A series of star wheels mounted on the sleeve serve to' cut keyway intothe wall of the hole b eifig dlil i d and to prevent rotation of the sleeve and also of the ring. gear. In
consequence, rotation of the main drill body by the drill string causes positive rotation of the pinion and of. the auxiliary drill bit in opposite direction to rotation of the i n Preferably the diameter of the auxiliary drill bit; is in excess of the radius of the main drill bit so that diamonds in the. auxiliary bit lying at the geometric center of the main drill bit have a positiv'e velocity imparted to them during drilling operations by reason of the positive rotation given to the auxiliary drillbit and also because of the eccentricity of the .axisof the latter relative to the main drill bit. Thus drilling of the hole is speeded because positive cutting action of andiamonds occurs. I
Additional objectsand features of the inventionare the provision of combined main and auxiliary drill bits in a unitary structure that is simple in structure; assembly, installation and operation. H
Further objects and features of th'e invention are the provision of appropriate distributing passageways for water to'both the main and auxiliary bit surfaces to promote efficient chip removal and heat dissipation and also the provision of additional passageways open tq the main water passageway to provide water pressure to counter low pressures of rock laden return mud and substantially preclude chances of serious jamming of the gears by rock particles in this mud.
Other objects and features of this invention will becomeapparent from the following specification and the accompanying drawings wherein:
2,877,988 I Patented Mar. 17, 1959 ice Figure l is a longitudinal section of a device embodying the invention taken along line 11 of Figure 4; I Figure 2 is a transverse section taken along line 22 of Figure Figure 3 is a transverse section taken along line 33 of Figure 1; and
Figure 4 is a bottom end elevation of the device.
Referring to the drawing, the reference character 10 generally denotes a rock drilling bit embodying the invention. This bit 10 includes a main bit body 11 which is threadedly engaged at 12 with an attaching shank 13 whose outer end 14 is threaded for conventional attachment to a drill string (not shown).
The bit body 11 and its shank 13 respectively in their upper and lower portions are surrounded by an annular sleeve 15 which freely is rotatable relative to bothv as on thrustand radial ball bearings 16. Other types of bearings may be used. Longitudinal extending slots or grooves 17 are provided at equi-spaced positions on, the periphery of the sleeve 15 and each serves to receive a series of rotatable star wheels 18, 19, 20 respectively supported on the shafts 21, 22 and 23 which transversely span the slots or grooves 17. The star wheels 18, 19 and 20" each project outwardly of theperipheral surface of the sleeve 15 but are of progressively decreasing diameter downwardly for purposes presently to be described.
A ring gear 24 is fixedly supported in a recess 25 provided at one end of the sleeve 15 for purposes presently is be described.
Diamond abrading surfaces 26 and 27 of conventional types are provided at the drilling end of main bit body 11'. Grooves 28 and 29 in these surfaces communicate with water passageway 30 in the bit body 11. This passageway 30 in turn is in communication with the main water passageway 31 inthe shank 13 to provide for flushing out of cut rock particles and for heat dissipation.
The main bit body 11 is provided with a longitudinally extending recess 32 located eccentri cally relative to its axis or center for receiving an auxiliary drill bit body 33. This auxiliary bit body 33 is supported within the recess 32 as by the radial and thrust anti-friction ball bearings 34 and 35 and the nut 36 which threa dedl y engages the inner threaded end 37 arms shaft portion 38 of the auxiliary bit body 33. Other types of bearings maybe used. The outer end portions of the body 33 are provided with an abrading surface 39 which isspr'ing loaded axially and maintained slightly protrudant as at the distance d below the lower abradingsurface 26 of the main bit body 11 as by a conventional Belleville or ring type spring 40 in order to compensate for bearing and diamond means and manufacturing tolerances.
A gear 41 is keyed to shaft portion 38 of auxiliary bit body 33 and meshes with the sleeve mounted ring gear 24 so that positive drive will be irnpartedto the gear 41 and consequently to auxiliary bit 33 when ring gear 24 is held against rotation during driven rotation of the main bit body 11 as will be presently described. I v
The abrading surface 39 of auxiliary bit body 32 is grooved at 42. These grooves communicate with a water passageway 43 which in turn is in open communication with main water passageway 31 in the shank 13for particle flushing and for heat dissipation. I
The auxiliary drill bit 33 at its abrading surface 39 overlaps the geometric center of the main bit body so that rotation of the main and auxiliary drill bit bodies will provide a substantial cutting velocity to the abrading surfaces even at the geometric center of the main bit body.
For ease of assembly 'of the component parts of the main and auxiliary drill bits, the main drill bit body 11 and its shank 13 are separate being joined at'tlie threaded joint 12 so that the auxiliary bit body 33 may be secured in the main bit body 11 by the nut 36 prior to the threaded joining at 12 of the main bit body 11 and its shank portion 13. Once joined, radial pins 44 serve to prevent unscrewing ofthe parts atsaid threaded joint 1-2. Also the ring gear 24 for assembly is constructed in sections and secured to the sleeve as by bolts or pins 45.
Additional fluid passageways 46 extending radially from the main water passageway 31 into the star wheel containing grooves or recesses 17 and additional fluid passageways 47 extending from fluid passageway 30 to the chamber 32 containing the gears 24 and 41 provide pressurized areas into which rock laden return mud incidental to drilling and which is under low pressure cannot enter. Thus chances of jamming the gears by rock particles is minimized.
In operation, after attachment of shank 13 to the drill string (not shown) when the drill assembly described is lowered into the hole and the drill string is rotated the drill bits cut the hole. As the drill assembly moves down into the hole drilled, the star wheels cut longitudinal key- .ways K into the hole wall. The progressively increasing the sleeve 15 and consequently of the ring gear 24 which is secured to this sleeve. In consequence the further rotation of the drill string causes driven drilling rotation of the main drill body 11 and forces rotation of gear 41 and rotation of auxiliary drill bit 33 in opposite direction to the direction of rotation of the main drill bit body 11. 7
Although star wheels have been described as a means for preventing rotation of the sleeve 15, other appropriate means may be utilized. As an alternative solid metal inserts may be carried in the groove their outwardly projecting surfaces being shaped to effect breaching of a keyway inthe wall. Other means of preventing rotation of the sleeve 15 while permitting free vertical motion thereof likewise are possible and are contemplated.
An additional feature of note is that the diameter of the auxiliarybit need not exceed the radius of the main drill bit. It is sulficient if its periphery overlaps the center line of the main bit and for this purpose its diameter can have any selected value either less than or in excess of the main bit radius,
While a specific embodiment of the invention has been shown and described, variations in structural detail within the scope of the appended claims are possible and are contemplated. There is no intention therefore of limitation to the exact details shown and described.
What is claimed is:
1. In combination, a main drill bit having an abrading surface, a rotatable auxiliary drill bit having an abrading surface, means for supporting said auxiliary drill bit within said main drill bit whereby its arbading surface will operate generally within the plane of said abrading surface of said main drill bit, a rotatable sleeve carried by said main drill bit, means for rotatably connecting said sleeve to said main drill bit, a ring gear secured to said sleeve, a pinion meshing with said ring gear and keyed to said rotatable auxiliary drill bit, and means extending from said sleeve for engaging the wall of a hole being drilled to prevent rotation of said sleeve and ring gear during drilling rotation of said main drill bit and thereby cause positive rotation of the pinion and of the auxiliary drill bit.
2. In combination, a main drill bit having an abrading surface, a rotatable auxiliary drill bit, having an abrading surface, bearing means for supporting the auxiliary drill bit within said main drill bit whereby the said abrading surfaces will operate generally within the same plane, a rotatable sleeve carried by said main drill bit, means for rotatably connecting said sleeve to said main drill bit, a ring gear secured to said sleeve, a pinion keyed to said auxiliary drill bit and meshing with said ring gear, star wheel means mounted on said sleeve and projecting outwardly of its periphery for engaging the wall of a hole being drilled and cutting a keyway therein, engagement of said star wheels in the keyway preventing rotation of said sleeve and ring gear during drilling rotation of said main drill bit and thereby causing positive rotation of the pinion and auxiliary drill bit in opposite direction to the rotary direction of the main drill bit.
3. In combination, a main drill bit having an abrading surface, a rotatable auxiliary drill bit having an abrading surface, means for supporting said auxiliary drill bit within said main drill bit whereby its abrading surface will operate generally within the plane of said abrading surface of said main drill bit, a rotatable sleeve carried by said main drill bit, means for rotatably connecting said sleeve to said main drill bit, a ring gear secured to said sleeve, a pinion meshing with said ring gear and keyed to said rotatable auxiliary drill bit, means extending from said sleeve for cutting a ,keyway into the wall of a hole being drilled and to prevent rotation of said sleeve and ring gear during drilling rotation of said main drill bit, thereby causing positive oppositely directed drilling rotation to said auxiliary. drill bit, and said bits having passages for distributionof water to their drilling surfaces and the said ring'gear for prevention of jamming of said gear and pinion by rock particles in rock laden return mud from the hole.
' 4. In combination with a rotary drill string, a mam drill bit connected to said drill string and having an abrading surface, a free sleeve annularly disposed around said main drill bit, means for rotatably connecting said free sleeve to said main drill bit, a ring gear interior of said free sleeve. and attached thereto, a rotatable auxiliary bit having an abrading surface, means for supporting said auxiliary drill bit within said main drill bit whereby its abrading surface operates generally within the plane of said abrading surface of. the main drill bit, a pinion attached to said auxiliary drill bit and meshing with said ring gear, spring means between said auxiliary drill bit and said main drill bit for assuring a minimum of positive downward thrust of said auxiliary drill bit, and means extending outwardly of said free sleeve and connected thereto for engaging a wall portion of a hole being drilled to prevent rotation of said free sleeve and said ring gear during drilling rotation of said main drill bit and thereby cause positive rotation of said pinion and of said auxiliary drill bit.
5. In combination with a rotary drill string, a main drill bit connected to said drill string and having an abrading surface, a free sleeve annularly disposed around said main .drillbit, means for rotatably connecting said free sleeve to said main drill bit, a ring gear interior. of said free sleeve and attached thereto, a rotatable auxiliary bit having an abrading surface, means for supporting said auxiliary drill bit within said main drill bit whereby its abrading surface operates generally within the plane of said abrading surface of the main drill bit, a pinion attached to said auxiliary drill bit and meshing with said ring gear, spring means between said auxiliary drill bit and-said main drill bit for assuring a minimum of positive downward thrust of said auxiliary drill bit, and star wheel means mounted on said free sleeve to project outwardly therefrom for engaging a wall portion of a hole being drilled to prevent rotation of said free sleeve and said ring gear during drilling rotation of said main drill bit and thereby cause positive rotation of said pinion and of said auxiliary drill bit.
6. In combination with a rotary drill string, a main drill bit connected to said drill string and having an abrading surface, a free sleeve annularly disposed around said main drill bit, means for rotatably connecting said free sleeve to said main drill bit, a ring gear interior of said free sleeve and attached thereto, a rotatable auxiliary bit .5 abrading surface operates generally within the plane of said abrading surface of the main drill bit, a pinion attached to said auxiliary drill bit and meshing with said ring gear, spring means between said auxiliary drill bit and said main drill bit for assuring a minimum of positive downward thrust of said auxiliary drill bit, and means extending outwardly of said free sleeve and connected thereto for engaging a wall portion of a hole being drilled to prevent rotation of said free sleeve and said ring gear during drilling rotation of said main drill bit and thereby cause positive rotation of said pinion and of said auxiliary 6 drill bit, both the said drill bits having passages for distribution of drilling fluid to their said abrading surfaces, and the said main drill bit having passages to said means connected thereto and to said ring gear for distribution 5 of drilling fluid thereto.
References Cited in the file of this patent UNITED STATES PATENTS Adamson June 20, 1950 2,667,334 Ortloif Jan. 26, 1954
US656963A 1957-05-03 1957-05-03 Drill bit with driven auxiliary bit Expired - Lifetime US2877988A (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077936A (en) * 1961-11-06 1963-02-19 Arutunoff Armais Diamond drill
US3419091A (en) * 1967-03-30 1968-12-31 Gulf Research Development Co Method and apparatus for drilling wells with eccentric jet drills
US3635296A (en) * 1970-06-04 1972-01-18 Maurice P Lebourg Drill bit construction
US3640352A (en) * 1969-12-12 1972-02-08 Robert W Stuart Rotary drill assembly
US3861477A (en) * 1972-08-18 1975-01-21 Rech & 0 Activities Petroliere Drilling bits for boring holes and wells
FR2395388A1 (en) * 1977-06-22 1979-01-19 Christensen Inc TREPAN TO EXTEND A WINDOW IN THE WELL OF A WELL TUBING
US4351402A (en) * 1980-05-27 1982-09-28 Gonzalez Eduardo B Body structure and nozzle for enhancing the flow of drilling fluid in a rotary drill bit
EP0084418A2 (en) * 1982-01-20 1983-07-27 Unicorn Industries Limited Improved drill bit and method
WO1986006784A1 (en) * 1985-05-16 1986-11-20 R.C.R. Oilfield, Inc. Well tool for use with down-hole drilling apparatus
US4739845A (en) * 1987-02-03 1988-04-26 Strata Bit Corporation Nozzle for rotary bit
US5033558A (en) * 1985-05-16 1991-07-23 R.C.R. Oilfield, Inc. Well tool for use with down-hole drilling apparatus
US5887668A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc. Wellbore milling-- drilling
GB2355745A (en) * 1999-10-27 2001-05-02 Baker Hughes Inc Milling tool with offset cutting structure
US20130098688A1 (en) * 2011-10-18 2013-04-25 Smith International, Inc. Drill bits having rotating cutting structures thereon
US20140332271A1 (en) * 2013-05-13 2014-11-13 Baker Hughes Incorporated Earth-boring tools including movable formation-engaging structures and related methods

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511831A (en) * 1950-06-20 Drill bit
US2667334A (en) * 1951-03-03 1954-01-26 Standard Oil Dev Co Full hole diamond bit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511831A (en) * 1950-06-20 Drill bit
US2667334A (en) * 1951-03-03 1954-01-26 Standard Oil Dev Co Full hole diamond bit

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077936A (en) * 1961-11-06 1963-02-19 Arutunoff Armais Diamond drill
US3419091A (en) * 1967-03-30 1968-12-31 Gulf Research Development Co Method and apparatus for drilling wells with eccentric jet drills
US3640352A (en) * 1969-12-12 1972-02-08 Robert W Stuart Rotary drill assembly
US3635296A (en) * 1970-06-04 1972-01-18 Maurice P Lebourg Drill bit construction
US3861477A (en) * 1972-08-18 1975-01-21 Rech & 0 Activities Petroliere Drilling bits for boring holes and wells
FR2395388A1 (en) * 1977-06-22 1979-01-19 Christensen Inc TREPAN TO EXTEND A WINDOW IN THE WELL OF A WELL TUBING
US4351402A (en) * 1980-05-27 1982-09-28 Gonzalez Eduardo B Body structure and nozzle for enhancing the flow of drilling fluid in a rotary drill bit
EP0084418A2 (en) * 1982-01-20 1983-07-27 Unicorn Industries Limited Improved drill bit and method
EP0084418A3 (en) * 1982-01-20 1983-08-10 Unicorn Industries Limited Improved drill bit and method
US5033558A (en) * 1985-05-16 1991-07-23 R.C.R. Oilfield, Inc. Well tool for use with down-hole drilling apparatus
WO1986006784A1 (en) * 1985-05-16 1986-11-20 R.C.R. Oilfield, Inc. Well tool for use with down-hole drilling apparatus
US4739845A (en) * 1987-02-03 1988-04-26 Strata Bit Corporation Nozzle for rotary bit
US5887668A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc. Wellbore milling-- drilling
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