Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2466991 A
Publication typeGrant
Publication date12 Apr 1949
Filing date6 Jun 1945
Priority date6 Jun 1945
Publication numberUS 2466991 A, US 2466991A, US-A-2466991, US2466991 A, US2466991A
InventorsKammerer Archer W
Original AssigneeKammerer Archer W
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rotary drill bit
US 2466991 A
Abstract  available in
Images(2)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

April 12, 1949.

Filed June 6, 1945 A. W. KAMMERER ROTARY DRILL BIT 2 Sheets-Sheet l 3 ARC/1'57? Jaw/M52512,

[N V EN TOR.

ATTORNEY.

A ril 12,1949.

filed June 6, 1945 'IHHIIIIHI A? W. KAMMERER ROTARY DRILL BIT 2 Sheets-Sheet 2 particularly to bits of Patented Apr. 12, 1949 UNITED STATES PATENT OFFICE ROTARY DRILL BIT Archer W. Kammerer, Fullerton, Calif.

Application June 6, 1945, Serial No. 597,744

15 Claims.

This invention relates to drill bits, and more the expanding type for drilling or reaming larger diameter holes below well casing than the inside diameter of such casing through which the bit is capable of passing.

It is an object of the present invention to provide an improved expansible rotary well drilling bit of simple and sturdy construction, which can be operated by the driller in much the same manner as the usual non-expanding rotary drill bits.

Another object of the invention is to provide an improved expansible rotary well drilling bit whose cutter parts are movable outwardly to a predetermined expanded position, and positively prevented from returning from such position to retracted position until drilling weight is removed from them.

Yet another object of the invention is to yieldably urge cutter members outwardly to a prededetermined position and then look them in such outward position until drilling weight is no longer imposed upon them, which will automatically allow their return to retracted position.

A further object of the invention is to provide an expansible rotary well drilling bit whose shiftable cutter parts are initially held in retracted position by positive means, which are releasable hydraulically upon reaching the desired operative position of the bit in the bore hole.

In its general aspects the invention contemplates an expansible rotary well drilling bit adapted to be lowered through well casing on the end of a string of drill pipe to a location below the casing at which a drilling or reaming operation is to commence. During the lowering operation the bit cutters and their supporting members remain in retracted position by riding the inner wall of the casing, or, if desired, they may be held positively in retracted position :by latching means.

Upon reaching the well bore location where the drilling operation is to commence, the drilling string and attached drill bit are rotated to cause the cutters to produce a formation shoulder under the outward cutter expanding influence of elastic or spring means. The extent of this outward expansion of the cutters is predetermined by a positive stop arrangement which governs the maximum diameter of the hole being drilled or reamed. After the full formation shoulder has been produced, drilling weight is imposed downwardly on the drill string to move a lock device into an operative position holding the cutters positively in an outward direction, and preventing their inward return movement until desired. After downward drilling or reaming of the de- 2 sired length of hole, the drilling weight is removed from the bit, enabling a retracting device to automatically shift the lock device and cutter mechanism into such relative positions as to permit retraction of the latter andupward removal of the tool from the well bore.

In the event that the positive, retracting latch device is used, circulating pumps must first be started to eject the latch device hydraulically, permitting functioning of the elastic or spring cutter expanders and their urging of the cutters outwardly against the wall of the bore hole to produce the aforementioned formation shoulder.

The invention has other objects which will become apparent from a. consideration of the embodiment shown in the drawings accompanying and constituting part of the present specification. This form of the invention will now be described in detail to illustrate the general principles of the invention, but it is to be understood that such detailed description is not to be taken in a limited sense, since the scope of the invention is best defined by the appended claims.

Referring to the drawings:

- Figure 1 is a side elevation of one form of drill bit embodying the invention;

Figure 2 is a longitudinal section through the drill bit, with parts shown in retracted position for lowering through the well bore;

Figure 3 is a view similar to Figure 2 with the parts shown in expanded position;

Figure 4 is a cross-section taken along the line 4-4 of Figure 3;

Figure 5 is a cross-section taken along the line 55 in Figure 3; and

Figure 6 is a partial longitudinal section taken along the line 6-6 in Figure 3.

As shown in the drawings, the rotary drill bit A is attached to a string of drill pipe B, by means of which it is lowered through a well casing in a well bore to a. point below the casing shoe D at which enlargement of the bore hole is to start. The drill bit preferably has a pilot bit H) at its lower end for centering the bit in a hole that may have already been drilled, or for drilling the central portion of new hole in the absence of a. pre-existing hole. The main portion of the bit is capable of enlarging the bore hole by producing and operating upon a formation shoulder E, as hereinafter described.

The upper end of the bit consists of a driving mandrel l l whose upper pin I 2 is threadedly connected to a sub l3 forming the lower end of the drill pipe string B. This mandrel includes an upper kelly or drill stem member M slidably 3 'splined to the main body I5 of the bit. As disclosed in the drawings, the exterior E41 of the kelly is hexagonal in shape and is telescopically received in a companion hexagonal socket I5a Within the body. The mandrel has a limited range of longitudinal movement within the body, its upward movement being limited by engagement of an external shoulder I6 on the kelly with a retainer ring I! at the upper end of the body,

suitably secured thereto, as by welding material I8.

The body I5 has a, plurality of expansible parts mounted on it, comprising opposed cutter supporting members I9, I9 pivotally carried between bifuricated body arms 20, on pivot or hinge pins 2|, 2|, suitably secured to the arms, as by welding material 22. Each cutter supporting member includes a depending leg 23 having a bearing supporting pin 24 inclined inwardly and downwardly, and on which is rotatably mounted a roller side cutter 25. Antifriction roller and ball bearing elements 25, 21 are preferably placed between each cutter 25 and bearing pin 24, the roller bearings 26 transmitting radial thrusts and the ball bearings 21 both radial and axial thrusts. The ball bearings 21 also retain the cutter on the pin, being inserted in place through a passage 28 in the bearing support which is then closed .by a plug 29 welded to the pin.

Each cutter supporting member I9 also includes an upwardly extending arm 30 against which an elastic expander 3| bears. This expander, in the form of a compressed coil spring, is received within a retainer pocket 32 in the body I5 and exerts its force against the arm 30, tending to swing it inwardly and thus urge the cutter 25 on the other side of the fulcrum pin 2| in an outward direction. The extent of this outward movement is limited by engagement of stop shoulders 33, 33 on opposite sides of the cutter supporting members I9 with cooperable body stop shoulders 34, 34.

After the cutters 25 have been expanded outwardly by the expander springs 3| to their maximum extent, they can be locked in this position by alower tubular member 35 of the mandrel II, which is threaded into the kelly I4 and is provided with a lock ring 47 movable from an upper position in transverse alignment with inner supporting'member recesses 36, permitting retraction of the cutters, to a lower position opposite lugs 3'! formed on and projecting inwardly from the supporting member legs 23, preventing retraction of the cutters. The mandrel l I is normally held in its upper position with respect to the main body I 5 of the bitand the supporting members I9 by a helical retractor spring 38 en circling the tubular member 35, with its upper end engaging the mandrel shoulder 39 and its lower end engaging a spring seat 40 at the lower end of the hexagonal body socket I5a. This spring seat 4!] also serves as an upper bearing guide for the tubular mandrel member 35, whose lower end is slid-able within a lower bearing guide 4| below the lugs 37, which is integral with or secured to the depending body arms 20 of the main body of the bit. The two guides 40, 4| form a spaced two point support for the mandrel member 35 and assist it in resisting inward movement of the cutter legs 23 to retracted position during the reaming or cutting operation.

Circulating fluid can pass downwardly through the string of drill pipe B and through the tubular mandrel I for ejection from its lower discharge nozzle end onto the cutters 25, to cleanse them of cuttings and flush the latter from the drilling area to the top of the well bore. This circulating fluid is also availed of to unlatch the cutter supporting members I9 in the event it is desired to hold them positively in retracted position.

A positive lock may be provided by securing a hook 42 to the inner portion of each cutter supporting member below the lower mandrel guide 4|, and inserting the ends 43 of these hooks in holes 44 in a strip 45 extending across the outlet 35a of the mandrel. The cutting tool A, after being lowered in retracted position to a point at which the reaming operation is to begin, may be released for operation by starting the pumps at the surface of the well bore, which will force fluid down through the drill string B and mandrel II and impinge upon the latch strip 45, blowing or forcing it off the hook ends 43 and permitting the spring expanders 3| to shift the supporting arms 30 inwardly and the cutters 25 outwardly against the formation.

In the operation of the device, the tool A is mounted on the lower end of the drill string B with its parts held in retracted position by the latch strip 45, as shown in Figure 2. In this position of operation, the compressed retractor spring 38 holds the mandrel I I and its kelly I4 in an upward position with respect to the body I5, as determined by engagement of the kelly shoulder I6 with the body retainer ring I7. With the mandrel in this position, its lock ring 41 is elevated above the lugs 37 on the cutter supporting members I9, being received within the inner recesses 36 in the supporting members, which permits the latter to be held inwardly against the action of the expander springs 3|. The tool is lowered through the well casing, and upon reaching the position in the well bore below the casing shoe D at which the drilling operation is to begin, the pumps are started at the surface of the well bore and fluid impinged on the latch strip 45, to force it hydraulically ofi the ends 43 of the hooks 42 and release the cutter supporting members I9 for outward expansion under the influence of the springs 3|.

The drill string B is then rotated to rotate the main bit body I5 through the splined kelly and body connection I4a, I5a, the expander springs 3| forcing the arms 39 inwardly and the cutters 25 outwardly against the formation. Rotation is continued without moving the drill string longitudinally until the side cutters 25 enlarge the diameter of the hole to the maximum extent, as determined by eventual abutting of the supporting member stop shoulders 33 with the companion body stop shoulders 34. Thereafter, the drill string is lowered to cause the formation shoulder E produced in the well bore by the cutters 25 under the action .of the expander 3| to support the cutter members 25, I9 and body I5, and prevent their downward movement. Since the body I5 cannot move downwardly, drilling weight imposed on the drilling string B shifts its connected mandrel II downwardly within the body I5 againstthe action of the retractor spring 38 until the lower end 48 of the kelly I4 engages the upper spring seat and guide 4|]. When in this position, the mandrel lock ring 47 is disposed opposite and in alignment with the lugs 37 on the inner portions of the cutter supporting members I9, providing a positive lock by preventing inward movement of the cutters. So long as down weight is. imposed on the drill string B and the cutters 25 rest on the formation shoulder E, the iCutters are prevented from moving inwardly by engagement-of their lugs 31 with the mandrel look ring 41. It is also to be noted that further outward movement of the cutters beyond a predetermined maximum reaming diameter is prevented by contact between the supporting member shoulders 33 and the body shoulders 34, through which the drilling weight is transmitted to the roller cutters 25, thereby relieving the hinge pins 2I of this load.

Drilling is continued by rotating the drill bit and imposing the proper drilling weight on the cutters to cause their removal of the formation material and reaming of the hole in a downward direction for the desired extent or length. When it is desired to retract the drill bit and remove it to the top of the well bore, all that need be done is elevate the drill string B, which moves the side cutters 25 above the formation shoulder E and permits the retractor spring 38 to press downwardly on the body I5 and move it, together with the cutter supporting members I9, downwardly with respect to the mandrel II. This action repositions the mandrel lock ring 41 opposite the supporting member recesses 36 and above their lugs 31, permitting inward swinging of the cutters 25 and their supporting members I9 when the tool passes back into the casing upon elevation of the drill string. The cutters and their supporting members will ride the wall of the casing during elevation of the string until the too-1 is removed from the top of the well bore.

Pads in the form of longitudinal drag reaming blades 46 can be formed at the lower outer surface of the cutter supporting members I9, which will ride the inner wall of the casing and prevent the cutter teeth from hanging up in the casing coupling spaces while the tool is being lowered therein. These pads 46 can be provided in addition to the hooks 42 and latch strip 45, or in place of the latter. When the latching device is used, the tool can be lowered through open hole below the casing shoe D to as far a distance as desired before the reaming operation commences. If the latch is not provided, downward movement of the drill string B can be stopped when the bit passes out of the shoe D, and the drill pipe B and bit A rotated to allow the cutters 25 to produce the formation shoulder E under the influence of the compressed expander springs 3|. Drilling in a downward direction can then proceed as aforementioned, with the drill string B and mandrel II lowered against the action of the retractor spring 38 to position the lock ring 41 opposite the lugs 31 and prevent inward movement of the cutters 2-5 until the drilling weight is removed from the drilling tool.

It is, therefore, apparent that a drill bit of the expanding type has been provided, which can be used in substantially the same manner as an ordinary non-expanding drill bit. After the springs 3| have formed the shoulder in the formation, ordinary drilling procedure is followed simply by imposing the required downward weight on the drill bit and rotating it through the string of drill pipe to remove the formation material and enlarge the hole. When the bit is to be removed to the top of the well bore, it is only necessary to elevate the drill string, which will automatically elevate the mandrel I I with respect to the body I5 and remove its lock ring 4-! from locked position with respect to the lugs 31, permitting inward retraction of the supporting members I9 and their cutters 25 and withdrawal of the bit through the well casing.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A rotary well drilling bit, including a main body, cutter means mounted on said body, spring means engaging said cutter means for expanding said cutter means laterally outwardly, a mandrel adapted to be connected directly to a tubular drill string, said mandrel being slidably splined to said body and movable in one longitudinal direction within said body into engagement with said cutter means for preventing inward movement of said cutter means from its outwardly expanded position, and pring means engaging said mandrel and body for moving said mandrel in another longitudinal direction within said body to a position permitting such inward movement.

2. A notary well drilling bit, including a main body, cutter means mounted on said body, spring means engaging said cutter means for expanding said cutter means laterally outwardly, a mandrel adapted to be connected directly to a tubular drill string, said mandrel being slidably splined to said body and movable downwardly within said body into engagement with said cutter means for preventing inward movement of said cutter means from its outwardly expanded position, and spring means engaging said mandrel and body for moving said mandrel in an upward direction within said body to a position permitting such inward movement.

3. A rotary well drilling bit, including a main body, cutter means pivotally mounted on said body and having an upwardly extending arm and a depending leg, spring means bearing against said body and arm for moving said arm inwardly and said leg outwardly, a mandrel adapted to be connected to a tubular drill string, said mandrel being slidably splined to said body and movable downwardly with respect thereto into engagement with said leg for preventing inward movement of said leg from its outward position, and spring means engaging said mandrel and body for moving said mandrel in a relative upward direction within said body to a position permitting such inward movement of said leg,

4. A rotary well drilling bit, including a main body, cutter mean pivotally mounted on said body and having an upwardly extending arm and a depending leg, spring means bearing against said body and arm for moving said arm inwardly and said leg outwardly, a mandrel adapted to be connected to a tubular drill string, said mandrel being slidably splined to said body and movable downwardly with respect thereto into engagement with said leg for preventing inward movement of said leg from its outward position, spring means engaging said mandrel and body for moving said mandrel in a relative upward direction in said body to a position permitting such inward movement of said leg, and stop means on said body and mandrel for limiting the extent of upward and downward movement therebetween.

5. A rotary well drilling bit, including a main body, cutter means pivotally mounted on said body and having an upwardly extending arm and a depending leg, spring means bearing against said body and arm for moving said arm inwardly and said leg outwardly, a mandrel extending downwardly within said body to a position adjacent said leg and adapted to be connected to a tubular drill string, said mandrel being slidably splined to said body and movable downwardly with respect thereto into engagement with said leg for preventing inward movement of said leg from its outward position, a guide secured to said body and slidably receiving the lower end of said mandrel to support the latter, and spring means engaging said mandrel and bodyio'r mov ing said mandrel in a relative upward direction in said body to a position permitting'such inward movement of said leg.

6. A rotary well'drilling bit, including amain body, cutter means pivotally mountedon said body and having an upwardly extending arm and a depending leg, spring'means bearing against said body and arm for moving said arm inwardly and said leg outwardly, a mandrel extending downwardly within said body to a position adjacent said leg and adapted to be connected to a tubular drill string, said'mandrel being slidably splined to said body and movable downwardly with respect thereto into engagement with said leg for preventing inward' movement of said leg from its outward position, a lower guide secured to said body and slidably receiving'the lower'end of said mandrel to support the latter, an upper guide in said' body slidably receiving said mandrel, and a spring engaging said upper guide and mandrel for moving said mandrel'in a. relative upward direction in said body to a position perinitting such inward movement of said leg.

7. A rotary well drilling bit, including a main body, opposed cutter means pivotally mounted on said body, each of said cutter means having an upwardly extending arm and a depending leg, a spring bearing against .each arm and said body for moving said arm inwardly and said leg outwardly, a mandrel extending downwardly within said body between said legs and adapted to be connected to a tubular drill string, said mandrel being slidably splined to said body and movable downwardly with respect thereto into engagement with said leg for preventing inward movement of said legs'from their outward positions, and spring means engaging said mandrel and body for moving said mandrel in a relative upward direction in said'body to a'position permitting such inward movement of such legs.

8. 'A rotary well drilling bit, including a'main body, opposed supporting members pivotally mounted on said body, each of said supporting members having an upwardly extending arm and a depending leg, a cutter mounted on each of said legs, a spring bearing against each supporting member arm and said body for moving said supporting member arm inwardly and said leg' and its cutter outwardly, a mandrel extending downwardly within said body between said legs and adapted to be connected to a tubular drill string, said mandrel being slidably splined to said body and movable downwardly with respect thereto into engagement with said legs for preventing inward movement of said cutters from their outward positions, and a spring within said body'engaging said mandrel for moving said mandrel in a relative upward direction in said body to a position permitting such inward movement of said cutters.

' 9. A rotary well drilling :bit, including a main body having a pair of opposed depending arms, opposed supporting members pivotally mounted on said body between said arms, each of said supporting members having an upwardly extending arm'and a depending leg, a roller cutter mounted on each of said legs, a spring bearing against each supporting member arm and said body for moving said supporting member arm inwardly and said leg and its cutter outwardly, a mandrel'extending cutter movement of said cutters from their outward positions, and spring means within said body engaging said mandrel for moving said mandrel in 'an upward direction relativeto said'body and legs to a position permitting such inward-movement of said cutters.

'10.. A-rotary'well drilling bit, including a main body having a pair of opposed depending arms, opposed supporting members pivotally mounted on said body between said arms, each of said supporting members having an upwardly extending arm and a depending leg, a roller cutter mounted on each'of said legs, a spring bearing against each supporting member arm and said body for moving said supporting member arm inwardly and said leg and its cutter outwardly, a mandrel extending downwardly between said body arms and adapted to be connected to a tubular drill string, said mandrel being slidably splined to said body and movable downwardly with respect thereto into engagement with said legs for preventing inward movement of said cutters from their outward positions, a guide secured to said body arms and slidably receiving the lower end of said mandrel to support the latter, and spring means engaging said mandrel and body for moving said mandrel in an upward direction relative to said body and legs to a position permitting such inward movement of said cutters.

11. A rotary well drilling bit, including a main body having a central fluid passage, cutter means mounted on said body, spring means engaging said cutter means for expanding said cutter means laterally outwardly, latch means connected to said cutter means for holding said cutter means in an inward position against the action of said spring means, said latch means being disposed in the path of fluid flow through said central passage to be disconnected from said cutter means by fluid flowing through said passage.

12. A rotary well drilling bit, including a main body, opposed cutter means pivotally mounted on said body, each of said cutter means having an up :ardly extending arm and a depending leg, a

spring bearing against each arm and said body for moving said inwardly and said leg outwardly, a-tubular mandrel extending downwardly within said bod; between said legs and adapted to'be connected to a tubular drill string, said mandrel being slidably splined to said body and movable downwardly with respect thereto into engagement with said legs for preventing inward movement of said legs from their outward position, latch means connected to said legs for holdingihem inwardly against the action of said springs, said mandrel being adapted to direct iiuid onto said latch means to disconnect it from said legs to permit their outward movement.

13. A rotary well drilling bit, including a main body,'cutter means mounted onsaid body, means engaging-saidrcutter means for expanding said means laterally outward, a mandrel adapted to be connected directly to a drill string,

said mandrel being slidably splined to said body and movable in one longitudinal direction along said body into engagement with said cutter means for preventing inward movement of said cutter means from its outwardly expanded position, and

means engaging said mandrel and body for moving said mandrel in another longitudinal direction along said body to a position permitting such inward movement,

14. A rotary well drilling bit; including a main body; cutter means mounted on said body; a

mandrel slidably splined to said body and adapted for connection to a tubular drill string; means engaging said cutter means for expanding said cutter means laterally outward independently of movement of said mandrel along said body; and means on said mandrel movable with said mandrel in one longitudinal direction along said body, after expansion of said cutter means, into engagement with said cutter means for preventing inward movement of said cutter means. 15. A rotary well drilling bit; including a main body having a fluid passage therein; cutter means carried by said body; means engaging said cutter means for expanding said cutter means laterally outwardly; and movable obstructing latch means in the path of fluid flow through said passage for holding said cutter means in an inward position against the action of said expanding means.

ARCHER. W. KAMMERER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 465,103 Wegner Dec. 15, 1891 807,826 Irvine Dec. 19, 1905 1,043,723 Randolph Nov. 5, 1912 1,177,172 Craven Mar. 28, 1916 1,183,630 Bryson May 16, 1916 1,530,370 Jenkins et a1 Mar. 17; 1925 1,544,757 Hufford et al July 7, 1925 1,618,368 Dietle Feb. 22, 1927 2,187,483 Baker Jan. 16, 1940

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US465103 *10 Jun 189115 Dec 1891 Combined drill
US807826 *11 Feb 190419 Dec 1905Frederick G IrvineUnderreamer.
US1043723 *22 Mar 19125 Nov 1912Charles W RandolphOil-well casing and packing therefor.
US1177172 *19 Feb 191528 Mar 1916James F CravenUnderreamer.
US1183630 *29 Jun 191516 May 1916Charles R BrysonUnderreamer.
US1530370 *14 Nov 192217 Mar 1925Ford Jenkins RichardWell-boring tool
US1544757 *5 Feb 19237 Jul 1925HuffordOil-well reamer
US1618368 *12 Nov 192522 Feb 1927Dietle Thomas SCasing ripper
US2187483 *21 Apr 193916 Jan 1940Baker Oil Tools IncWell cementing apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2545032 *29 Jul 194613 Mar 1951Kammerer Archer WExpansible rotary drill bit
US2545036 *12 Aug 194813 Mar 1951Kammerer Archer WExpansible drill bit
US2545037 *8 Apr 194913 Mar 1951Kammerer Archer WRotary drill bit apparatus
US2566671 *21 Aug 19484 Sep 1951Pearl Edith LivingstoneRotary drilled hole enlarger
US2641447 *9 Jan 19509 Jun 1953Kammerer Archer WHook tooth rotary drill bit and cutter
US2650072 *18 Aug 195025 Aug 1953Kammerer Archer WMultiple expansion rotary drill bit
US2654575 *9 Jan 19506 Oct 1953Kammerer Archer WTandem expansible rotary drill bit
US2654576 *18 Aug 19506 Oct 1953Kammerer Archer WExpansible rotary drill bit
US5562171 *4 May 19958 Oct 1996Baker Hughes IncorporatedAnti-balling drill bit
US6427788 *22 Sep 20006 Aug 2002Emerald Tools, Inc.Underreaming rotary drill
US719811914 Dec 20053 Apr 2007Hall David RHydraulic drill bit assembly
US722588622 Dec 20055 Jun 2007Hall David RDrill bit assembly with an indenting member
US72581792 Jun 200621 Aug 2007Hall David RRotary bit with an indenting member
US727019621 Nov 200518 Sep 2007Hall David RDrill bit assembly
US73287556 Dec 200612 Feb 2008Hall David RHydraulic drill bit assembly
US733785824 Mar 20064 Mar 2008Hall David RDrill bit assembly adapted to provide power downhole
US736061018 Jan 200622 Apr 2008Hall David RDrill bit assembly for directional drilling
US73928573 Jan 20071 Jul 2008Hall David RApparatus and method for vibrating a drill bit
US739883724 Mar 200615 Jul 2008Hall David RDrill bit assembly with a logging device
US74190161 Mar 20072 Sep 2008Hall David RBi-center drill bit
US74190181 Nov 20062 Sep 2008Hall David RCam assembly in a downhole component
US742492215 Mar 200716 Sep 2008Hall David RRotary valve for a jack hammer
US74269686 Apr 200623 Sep 2008Hall David RDrill bit assembly with a probe
US748457612 Feb 20073 Feb 2009Hall David RJack element in communication with an electric motor and or generator
US749727929 Jan 20073 Mar 2009Hall David RJack element adapted to rotate independent of a drill bit
US7506701 *21 Mar 200824 Mar 2009Hall David RDrill bit assembly for directional drilling
US752711013 Oct 20065 May 2009Hall David RPercussive drill bit
US753373712 Feb 200719 May 2009Hall David RJet arrangement for a downhole drill bit
US755937910 Aug 200714 Jul 2009Hall David RDownhole steering
US757178025 Sep 200611 Aug 2009Hall David RJack element for a drill bit
US759132730 Mar 200722 Sep 2009Hall David RDrilling at a resonant frequency
US760058615 Dec 200613 Oct 2009Hall David RSystem for steering a drill string
US761788625 Jan 200817 Nov 2009Hall David RFluid-actuated hammer bit
US764100228 Mar 20085 Jan 2010Hall David RDrill bit
US766148731 Mar 200916 Feb 2010Hall David RDownhole percussive tool with alternating pressure differentials
US769475612 Oct 200713 Apr 2010Hall David RIndenting member for a drill bit
US77218266 Sep 200725 May 2010Schlumberger Technology CorporationDownhole jack assembly sensor
US776235328 Feb 200827 Jul 2010Schlumberger Technology CorporationDownhole valve mechanism
US78664164 Jun 200711 Jan 2011Schlumberger Technology CorporationClutch for a jack element
US790072014 Dec 20078 Mar 2011Schlumberger Technology CorporationDownhole drive shaft connection
US795440127 Oct 20067 Jun 2011Schlumberger Technology CorporationMethod of assembling a drill bit with a jack element
US796708228 Feb 200828 Jun 2011Schlumberger Technology CorporationDownhole mechanism
US79670839 Nov 200928 Jun 2011Schlumberger Technology CorporationSensor for determining a position of a jack element
US801145726 Feb 20086 Sep 2011Schlumberger Technology CorporationDownhole hammer assembly
US802047127 Feb 200920 Sep 2011Schlumberger Technology CorporationMethod for manufacturing a drill bit
US812298022 Jun 200728 Feb 2012Schlumberger Technology CorporationRotary drag bit with pointed cutting elements
US81301178 Jun 20076 Mar 2012Schlumberger Technology CorporationDrill bit with an electrically isolated transmitter
US819165131 Mar 20115 Jun 2012Hall David RSensor on a formation engaging member of a drill bit
US820189210 Dec 200719 Jun 2012Hall David RHolder assembly
US820568824 Jun 200926 Jun 2012Hall David RLead the bit rotary steerable system
US82154206 Feb 200910 Jul 2012Schlumberger Technology CorporationThermally stable pointed diamond with increased impact resistance
US822588331 Mar 200924 Jul 2012Schlumberger Technology CorporationDownhole percussive tool with alternating pressure differentials
US824040410 Sep 200814 Aug 2012Hall David RRoof bolt bit
US826719628 May 200918 Sep 2012Schlumberger Technology CorporationFlow guide actuation
US828188229 May 20099 Oct 2012Schlumberger Technology CorporationJack element for a drill bit
US829237221 Dec 200723 Oct 2012Hall David RRetention for holder shank
US829737531 Oct 200830 Oct 2012Schlumberger Technology CorporationDownhole turbine
US829737823 Nov 200930 Oct 2012Schlumberger Technology CorporationTurbine driven hammer that oscillates at a constant frequency
US830791911 Jan 201113 Nov 2012Schlumberger Technology CorporationClutch for a jack element
US831696411 Jun 200727 Nov 2012Schlumberger Technology CorporationDrill bit transducer device
US832279616 Apr 20094 Dec 2012Schlumberger Technology CorporationSeal with contact element for pick shield
US83332541 Oct 201018 Dec 2012Hall David RSteering mechanism with a ring disposed about an outer diameter of a drill bit and method for drilling
US834226615 Mar 20111 Jan 2013Hall David RTimed steering nozzle on a downhole drill bit
US83426118 Dec 20101 Jan 2013Schlumberger Technology CorporationSpring loaded pick
US836017430 Jan 200929 Jan 2013Schlumberger Technology CorporationLead the bit rotary steerable tool
US840833628 May 20092 Apr 2013Schlumberger Technology CorporationFlow guide actuation
US841878411 May 201016 Apr 2013David R. HallCentral cutting region of a drilling head assembly
US84345736 Aug 20097 May 2013Schlumberger Technology CorporationDegradation assembly
US844904030 Oct 200728 May 2013David R. HallShank for an attack tool
US849985723 Nov 20096 Aug 2013Schlumberger Technology CorporationDownhole jack assembly sensor
US852289711 Sep 20093 Sep 2013Schlumberger Technology CorporationLead the bit rotary steerable tool
US852866428 Jun 201110 Sep 2013Schlumberger Technology CorporationDownhole mechanism
US854003730 Apr 200824 Sep 2013Schlumberger Technology CorporationLayered polycrystalline diamond
US855019030 Sep 20108 Oct 2013David R. HallInner bit disposed within an outer bit
US856753216 Nov 200929 Oct 2013Schlumberger Technology CorporationCutting element attached to downhole fixed bladed bit at a positive rake angle
US857333129 Oct 20105 Nov 2013David R. HallRoof mining drill bit
US859064426 Sep 200726 Nov 2013Schlumberger Technology CorporationDownhole drill bit
US859638131 Mar 20113 Dec 2013David R. HallSensor on a formation engaging member of a drill bit
US862215527 Jul 20077 Jan 2014Schlumberger Technology CorporationPointed diamond working ends on a shear bit
US870179929 Apr 200922 Apr 2014Schlumberger Technology CorporationDrill bit cutter pocket restitution
US871428516 Nov 20096 May 2014Schlumberger Technology CorporationMethod for drilling with a fixed bladed bit
US882044030 Nov 20102 Sep 2014David R. HallDrill bit steering assembly
US883988823 Apr 201023 Sep 2014Schlumberger Technology CorporationTracking shearing cutters on a fixed bladed drill bit with pointed cutting elements
US89318546 Sep 201313 Jan 2015Schlumberger Technology CorporationLayered polycrystalline diamond
US895051727 Jun 201010 Feb 2015Schlumberger Technology CorporationDrill bit with a retained jack element
US905179525 Nov 20139 Jun 2015Schlumberger Technology CorporationDownhole drill bit
US906841026 Jun 200930 Jun 2015Schlumberger Technology CorporationDense diamond body
US931606111 Aug 201119 Apr 2016David R. HallHigh impact resistant degradation element
US936608928 Oct 201314 Jun 2016Schlumberger Technology CorporationCutting element attached to downhole fixed bladed bit at a positive rake angle
US967734322 Sep 201413 Jun 2017Schlumberger Technology CorporationTracking shearing cutters on a fixed bladed drill bit with pointed cutting elements
US970885620 May 201518 Jul 2017Smith International, Inc.Downhole drill bit
US20070114061 *6 Apr 200624 May 2007Hall David RDrill Bit Assembly with a Probe
US20070114062 *24 Mar 200624 May 2007Hall David RDrill Bit Assembly with a Logging Device
US20070114065 *21 Nov 200524 May 2007Hall David RDrill Bit Assembly
US20070114066 *24 Mar 200624 May 2007Hall David RA Drill Bit Assembly Adapted to Provide Power Downhole
US20070114067 *22 Dec 200524 May 2007Hall David RDrill Bit Assembly with an Indenting Member
US20070114068 *18 Jan 200624 May 2007Mr. David HallDrill Bit Assembly for Directional Drilling
US20070114071 *2 Jun 200624 May 2007Hall David RRotary Bit with an Indenting Member
US20070119630 *29 Jan 200731 May 2007Hall David RJack Element Adapted to Rotate Independent of a Drill Bit
US20070125580 *12 Feb 20077 Jun 2007Hall David RJet Arrangement for a Downhole Drill Bit
US20070221406 *25 Sep 200627 Sep 2007Hall David RJack Element for a Drill Bit
US20070221408 *30 Mar 200727 Sep 2007Hall David RDrilling at a Resonant Frequency
US20070221412 *15 Mar 200727 Sep 2007Hall David RRotary Valve for a Jack Hammer
US20070229232 *11 Jun 20074 Oct 2007Hall David RDrill Bit Transducer Device
US20070229304 *8 Jun 20074 Oct 2007Hall David RDrill Bit with an Electrically Isolated Transmitter
US20070272443 *10 Aug 200729 Nov 2007Hall David RDownhole Steering
US20080035380 *27 Jul 200714 Feb 2008Hall David RPointed Diamond Working Ends on a Shear Bit
US20080048484 *30 Oct 200728 Feb 2008Hall David RShank for an Attack Tool
US20080087473 *13 Oct 200617 Apr 2008Hall David RPercussive Drill Bit
US20080099243 *27 Oct 20061 May 2008Hall David RMethod of Assembling a Drill Bit with a Jack Element
US20080142263 *28 Feb 200819 Jun 2008Hall David RDownhole Valve Mechanism
US20080156536 *3 Jan 20073 Jul 2008Hall David RApparatus and Method for Vibrating a Drill Bit
US20080156541 *26 Feb 20083 Jul 2008Hall David RDownhole Hammer Assembly
US20080173482 *28 Mar 200824 Jul 2008Hall David RDrill Bit
US20080179098 *21 Mar 200831 Jul 2008Hall David RDrill Bit Assembly for Directional Drilling
US20080296015 *4 Jun 20074 Dec 2008Hall David RClutch for a Jack Element
US20080302572 *23 Jul 200811 Dec 2008Hall David RDrill Bit Porting System
US20080314647 *22 Jun 200725 Dec 2008Hall David RRotary Drag Bit with Pointed Cutting Elements
US20090000828 *10 Sep 20081 Jan 2009Hall David RRoof Bolt Bit
US20090057016 *31 Oct 20085 Mar 2009Hall David RDownhole Turbine
US20090065251 *6 Sep 200712 Mar 2009Hall David RDownhole Jack Assembly Sensor
US20090133938 *6 Feb 200928 May 2009Hall David RThermally Stable Pointed Diamond with Increased Impact Resistance
US20090158897 *27 Feb 200925 Jun 2009Hall David RJack Element with a Stop-off
US20090160238 *21 Dec 200725 Jun 2009Hall David RRetention for Holder Shank
US20090183919 *31 Mar 200923 Jul 2009Hall David RDownhole Percussive Tool with Alternating Pressure Differentials
US20090183920 *31 Mar 200923 Jul 2009Hall David RDownhole Percussive Tool with Alternating Pressure Differentials
US20090255733 *24 Jun 200915 Oct 2009Hall David RLead the Bit Rotary Steerable System
US20090273224 *30 Apr 20085 Nov 2009Hall David RLayered polycrystalline diamond
US20090294182 *6 Aug 20093 Dec 2009Hall David RDegradation Assembly
US20100000794 *11 Sep 20097 Jan 2010Hall David RLead the Bit Rotary Steerable Tool
US20100059289 *16 Nov 200911 Mar 2010Hall David RCutting Element with Low Metal Concentration
US20100065332 *16 Nov 200918 Mar 2010Hall David RMethod for Drilling with a Fixed Bladed Bit
US20100065334 *23 Nov 200918 Mar 2010Hall David RTurbine Driven Hammer that Oscillates at a Constant Frequency
US20100108385 *23 Nov 20096 May 2010Hall David RDownhole Jack Assembly Sensor
US20100326740 *26 Jun 200930 Dec 2010Hall David RBonded Assembly Having Low Residual Stress
US20110042150 *29 Oct 201024 Feb 2011Hall David RRoof Mining Drill Bit
US20110048811 *27 Jun 20103 Mar 2011Schlumberger Technology CorporationDrill bit with a retained jack element
US20110080036 *8 Dec 20107 Apr 2011Schlumberger Technology CorporationSpring Loaded Pick
US20110180324 *31 Mar 201128 Jul 2011Hall David RSensor on a Formation Engaging Member of a Drill Bit
US20110180325 *31 Mar 201128 Jul 2011Hall David RSensor on a Formation Engaging Member of a Drill Bit
USD62051026 Feb 200827 Jul 2010Schlumberger Technology CorporationDrill bit
USD67442215 Oct 201015 Jan 2013Hall David RDrill bit with a pointed cutting element and a shearing cutting element
USD67836815 Oct 201019 Mar 2013David R. HallDrill bit with a pointed cutting element
Classifications
U.S. Classification175/271, 408/26, 175/290, 175/286, 175/340, 175/375
International ClassificationE21B10/26, E21B10/34
Cooperative ClassificationE21B10/34
European ClassificationE21B10/34