US3640356A - Diamond bit - Google Patents
Diamond bit Download PDFInfo
- Publication number
- US3640356A US3640356A US884396A US3640356DA US3640356A US 3640356 A US3640356 A US 3640356A US 884396 A US884396 A US 884396A US 3640356D A US3640356D A US 3640356DA US 3640356 A US3640356 A US 3640356A
- Authority
- US
- United States
- Prior art keywords
- bit
- sidewall
- diamond
- diamonds
- central axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000010432 diamond Substances 0.000 title claims abstract description 275
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 166
- 238000005520 cutting process Methods 0.000 claims abstract description 68
- 238000005553 drilling Methods 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 238000005755 formation reaction Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 239000005018 casein Substances 0.000 description 1
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Definitions
- HIS ATTORNEY DIAMOND BIT BACKGROUND OF THE INVENTION 1.
- This invention relates to diamond bits, and more particularly to diamond bits such as can be used in well drilling.
- Diamond bits are used in particular for drilling holes through rock material of poor drillability, which is often required when drilling subsurface formations for the purpose of prospecting for and/or recovering oil or other valuable products.
- bits are of the rotary type and the diamonds thereof exert a scraping action on the rock through which a hole is being drilled, the bit being loaded in an axial direction and being rotated around its central axis.
- Bits of this type are especially useful for drilling through deep, abrasive, hard formations, since under these operating conditions they have a longer life than any other type of rotary rock bit, such as a roller bit. Consequently, a diamond bit has to be replaced less frequently than a bit of another type.
- the higher material and manufacturing costs of a diamond bit as compared with other types of bits are easily compensated by the advantages obtained as a result of the reduction in time required to replace the worn bits during drilling operations.
- the object of the invention is to provide a diamond bit which is less liable to be damaged by lateral vibrations during drilling than known diamond bits.
- a further object is to provide a diamond that which is less liable to wobbling than known diamond bits.
- Still a further object of the invention is to provide a diamond bit in which the diamonds are less liable to be crushed or burned than in known diamond bits.
- oversize-hole cutting causes the diamonds on the bottom part of the bit or the face of the bit (that is the part of the bit cutting the bottom of the hole) to cut zigzag tracks and to cross each others tracks, thus giving rise to shock loads on the diamonds.
- oversize-hole cutting is that the bit on being rotated in the hole is subject to wobbling, whereby the diamonds arranged in the face of the bit become overloaded.
- oversize-hole cutting is that the flow of drilling fluid over the surface of the bit and along the diamonds is no longer exclusively controlled by the waterways arranged in the outer wall of the bit body, so that diamonds which are insufficiently cooled owing to the disturbance of the required drilling fluid distribution over the surface of the diamond bit will be burned out.
- the diamond bit comprises a bit body and means for connecting the body to a tubular string, the body carrying diamonds for cutting a hole in a formation in which the bit is operated by rotation around the central axis thereof.
- the bit further comprises diamonds arranged in the sidewall of the bit body for cutting the sidewall of the hole, each of these diamonds being set in a blunt position in a direction radial to the central axis of the diamond bit, as well as being set in a cutting position in a direction tangential to a helical line passing through the cutting tip of the diamond and having a central axis coinciding with the central axis of the diamond bit, this tangential direction being taken at the cutting tip of the relevant diamond.
- the diamonds arranged in the sidewall of the bit body may touch a conical plane having the central axis thereof coinciding with the central axis of the diamond bit, the conical plane being arranged with the apex thereof in the direction is which the bit is axially loaded duringoperation.
- the apex angle of this conical plane may be between 010 and 20.
- the diamonds arranged in the sidewall of the bit body may touch a rotational symmetrical plane which is concave with respect to the central axis of the diamond bit and has a central axis coinciding with the central axis of the diamond bit, which plane has tangential cones which are arranged with the apices thereof in the direction in which the bit is axially loaded during operation and have apex angles with a value between 010 and 20.
- Some of the diamonds arranged in the sidewall of the bit body may touch a cylindrical plane having a central axis coinciding with the central axis of the diamond bit. These latter diamonds have a cutting diameter which is equal to the largest cutting diameter of the other diamonds arranged in the sidewall, and lie-in the operative position of the bit wherein the central axis thereof is vertically arrangedabove the other diamonds arranged in the sidewall.
- the sidewall of the bit body may comprise further diamonds, which touch a conical plane having a central axis coinciding with the central axis of the diamond bit and being arranged with the apex thereof in a direction opposite to the direction in which the bit is axially loaded during operation, these diamonds being arranged in a position lyingin the operative position of the bit wherein the central axis is vertically arrangedabove the plane passing through the upper diamonds which are arranged in the sidewall of the body to cut the sidewall of the hole.
- FIG. 1 shows a side view of a diamond bit according to the invention
- FIG. 2 is a longitudinal cross section of the bit shown in FIG. 1 taken in the direction of the arrows 22;
- FIG. 3 is a horizontal section of the bit shown in FIG. 1 taken in the direction of the arrows 33;
- FIG. 4 shows an enlargement of the diamond which is located at the intersection of section 22 and section 33 in FIG. 1;
- FIG. 5 shows a longitudinal cross section through the diamond shown in FIG. 4 in the direction of the arrows 55;
- FIG. 6 shows a horizontal cross section through the diamond shown in FIG. 4 in the direction of the arrows 66;
- FIG. 7 represents an alternative of detail A in FIG. 2 on a larger scale than FIG. 2.
- a preferred embodiment of the invention shown by way of example in FIGS. 1-3 of the drawing comprises a bit body ll formed by a wear-resistant material, in which body diamonds 2 are set. These diamonds are grouped alongside waterways 3 via which drilling liquid is passed to cool the diamonds 2 and keep them clean from drilling flour and cuttings. The liquid further cools the bit body II and carries away the rock cut by the diamonds 2.
- the bit body 1 may consist of tungsten carbide grains which are sintered together and to the steel shank 4 in a known manner such as that of Feenstra, US. Pat. No. 3,453,719.
- the diamonds 2 are set in the bit body I and the waterways 3 are formed in the mass of tungsten carbide particles before the sintering process is carried out. Since these techniques are known, they are not described here in detail.
- the steel shank 4 comprises a coupling 5 provided with connecting means such as screw thread 6 suitable for connecting the diamond bit to a drill collar string (not shown) or other tubular string. If desired, the steel shank 4 may be connected directly to the shaft of a hydraulic turbine or an electric motor suitable for being operated in a borehole.
- the shank 4 is further provided with a central channel 7 for passing drilling liquid from the interior of the tubular string connected to the screw thread 6 of the coupling 5, to the waterways 3 arranged in the surface of the bit body I.
- the center part of the bit body 1 has a conically shaped introversion 8 (FIG. 2) and a channel 9 is provided connecting the channel 7 in the shank 4 with the apex of the conically shaped introversion 8. Since the channel 9 is not concentrically arranged with respect to the central axis of the bit body I, no core will be formed from the formation when the bit according to the invention is being operated in a subsurface formation.
- the waterways 3 run from the channel 9 over the curved face of the bit body I and over the sidewall 11 (also indicated by gauge" side).
- FIGS. 4, 5 and 6, show a diamond corresponding to that in FIG. 1, which is located at the intersection of the sectional planes 2-2 and 3-3.
- FIG. 4 is an enlargement of this diamond in the position shown in FIG. 1, and FIGS. 5 and 6 are cross sections thereof, respectively, along sectional planes 55 and 6-6 in FIG. 4.
- the diamond 12 shown in FIG. 4 is approximately cubeshaped and located with a fiat plane thereof in the surface of the sidewall 11 (FIGS. 5 and 6). This means that the diamond is set in a blunt position in a direction radial to the central axis (not shown) of the diamond bit. Thus, the diamond cannot exert any cutting action as a result of load being exerted on the diamond 12 in a direction not coinciding with this central axis.
- the lower plane of the diamond 12 makes an angle B with the horizontal line 13.
- This angle B may be in the order of 0 to 30, and if desired even be negative. Consequently, on movement of the diamond 12 in the direction of arrow 14 (being the movement of rotation of the diamond bit) the tip 15 of the diamond 12 is in a cutting position when load is exerted thereon in a direction axial to the central axis of the bit.
- the diamond 12 set in the sidewall 11 of the bit body 1 is thus in a cutting position in a direction tangential to a helical line passing through the cutting tip 15 of the diamond 11 and having an axis coinciding with the central axis of the diamond bit, this tangential direction being taken at the cutting tip 15 of the diamond 12. It will be appreciated that if the angle B is negative, the comer 15A of the diamond 12 will act as a cutting tip. It will further be appreciated that what has been described with reference to the diamond 12 shown in FIGS. 4-6, also applies to all the other diamonds 2 set in the sidewall 11 of the bit body 1, which diamonds willwhen the diamond bit is operated in a subsurface formation cut the wall ofthe hole which is then being drilled by the bit.
- the angle between the surface of the sidewall 11 and the central axis of the diamond bit is indicated by C in FIG. 5. Since in the embodiment shown in FIGS. 1-6 of the drawing, the sidewall I I of the diamond bit is conical, the apex angle of the cone on which the sidewall 11 is located is twice the value of the angle C. This value preferably may be between 05' and 10. It will be appreciated that the value of angle B increases with increasing values of the angle C.
- cutting diameter of a diamond is understood to mean the diameter of a circle in a plane perpendicular to the central axis of the diamond bit in which the relevant diamond is located and along which circle the cutting tip of the diamond travels during rotation of the bit around its central axis.
- the advantages are threefold.
- the diamonds of the bottom part 10 of the bit remain in their own track and cannot cut zigzag tracks and cross each others tracks, which would occur if the hole was oversize and would result in shock loads being exerted on the diamonds.
- the fluid flow across the surface of the bit remains controlled exclusively by the waterways 3, because the bit profile fits the hole profile in the absence of oversize cutting. Consequently, each diamond will be adequately cooled and there will be no burning of the diamonds such as often occurs when an oversize hole is being drilled.
- the stabilization of the string is better than in an oversized hole, as a result of which wobbling of the bit is reduced and the life of the diamonds is prolonged.
- the form of the sidewall 11 of the drill bit is not restricted to a conical plane as described with reference to FIGS. 1-6.
- this sidewall may be formed by a rotational symmetrical plane obtained by rotating a slightly curved line around the central axis of the bit.
- This sidewall must have a positive curvature, and the diameter of the bit body in cross sections perpendicular to the central axis of the bit has to increase in an upward direction.
- the projection of this sidewall on the bottom of the hole should be relatively small.
- the apex angles of the cones which can be arranged tangentially to this sidewall should be small, preferably in the order of 0 IO'-20. These cones are arranged with the apices thereof in the direction wherein the bit is axially loaded.
- each diamond arranged in the cylindrical part of the sidewall and having a cutting diameter which is equal to the largest cutting diameter of the other diamonds arranged in this sidewall is set in a blunt position in a direction radial to the central axis of the diamond bit, and is set in a cutting position in a direction tangential to a helical line passing through the cutting tip of the diamond and having an axis coinciding with the central axis of the diamond bit, this tangential direction being taken at the cutting tip of the relevant diamond.
- Retrieval of the bit from the hole may be made easier by providing the upper part of the bit body with a conically shaped part, which part may be provided with diamonds touching the conical surface. These diamonds may be set sharp and/or blunt.
- FIG. 7 of the drawing shows part of a sidewall of a bit, which part can be considered as an altemative of detail A of the cross section of the bit shown in FIG. 2, but on a larger scale.
- the cross section shown in FIG. 7 is taken over a row of diamonds instead of over a waterway as is the casein FIG. 2.
- the shank 20 shown in FIG. 7 carries a bit body 21 made of wear-resistant material and carrying diamonds touching the outer surface thereof. This surface is divided into four zones 22, 23, 24 and 25.
- Zone 22 is the lower or bottom part of the bit body carrying diamonds 26 which are set so as to cut the bottom of the hole when the bit is operated in a subsurface formation.
- Zone 23 is that part of the sidewall which carries diamonds 27 each of which is set blunt in a radial direction, and sharp in a direction tangential to a helical line passing through the cutting tip of the diamond and having an axis coinciding with the central axis of the bit. All the details given with reference to the diamond 12 in FIGS. M also apply to these diamonds, except, however, that the diamonds 27 do not touch a conical plane, but a rotational symmetrical plane 28, which is concave with respect to the central axis of the diamond bit and has a central axis coinciding with the central axis of the diamond bit.
- This plane 28 further has cones (not shown) touching the plane, which cones are arranged with the apices thereof in the direction in which the bit is axially loaded during operation, and which cones preferably have apex angles with a value between 010 and 20.
- Zone 24 is that part of the sidewall which carries diamonds 29, each of which is equal to the uppermost diamond 27 in cutting diameter as well as in setting.
- Diamond 27' is the uppermost diamond of a row of diamonds 27 located in zone 23 and touching the rotational symmetrical plane 28.
- the diamonds 29 touch a cylindrical part of the sidewall and are arranged to take over the function of the diamond 27' should this diamond fail. This prevents the hole from being undercut if the diamond 27 and the corresponding diamonds in other rows are burnt or broken out.
- Zone 25 is the upper part of the sidewall, which part carries diamonds 31 It will be clear that this part of the sidewall does not cut the wall of the hole when the drilling bit is in operation, but will guide the bit when the latter is being lifted from the hole.
- the diamonds 30 are set sharp and prevent wearing out of the zone 25 during retrieval of the bit from the hole. Moreover, the bit can be cut free in an upward direction by rotation during retrieval of the bit from the hole.
- the invention is not limited to bits having a bottom part or lower part and a conical introversion 8 shaped as shown in FIG. 2. Any other form of bottom part or introversion thereof may be applied which is suitable for the purpose.
- the invention is neither limited to the number and distribution of the diamonds over the surface of the bits as shown in FIGS. 1-3 and 7, nor to the number and shape of the waterways 3, nor the distribution of these waterways over the surface of the bits as shown in FIGS. 13 and 7.
- the apex angle of the conical surface which is touched by the diamonds arranged in the sidewall ll of the bit shown in FIGS. 1-3 preferably may be between 010 and 20.
- This sidewall 11 may further be extended in an upward direction by a zone 24 as shown in FIG. 7 and/or a zone 25 as is also shown in FIG. 7.
- the application of the inventive diamond-studded sidewall which prevents oversize cutting of a borehole is further not restricted to diamond bits having a drilling liquid supply 9 as shown in FIG. 2. If desired, any other suitable supply of drilling liquid may be used. Furthermore, the invention is not restricted to bits which do not leave a core in the center of the hole, but may also be used with core bits, or bits leaving a core of small diameter which is subsequently broken by the action of the bit and the fragments of which are removed via a side opening in the bit.
- the blunt position of a diamond with respect to loads exerted in a direction radial and perpendicular to the central axis of the diamond bit is obtained by placing a substantially flat plane of the diamond in the plane of the sidewall.
- this blunt position may also be obtained by placing the diamond in a dragging position which means that the point of contact between the diamond and the conical plane is the trailing part of the diamond when viewed in the direction of movement of the diamond along the wall of the borehole.
- the bit, the drill collars and the drill pipes are right-hand threaded, which means that the diamond bit unit is rotated clockwise when looking into the hole (arrow 114 in FIG. 4i).
- the angle R in FIG. 6 indicates the angle between the diamond plane and the conical plane, through which the diamond can be dragged along the wall of the borehole without cutting in a radial direction.
- the comer 15A of the diamond 12 then acts as cutting tip in a direction tangential to a helical line having a central axis coinciding with the central axis of the bit. This line passes through the tip 15A and the tangential direction is taken at the tip 115A.
- diamonds shown in the drawing to which the above examples refer are all approximately cube-shaped, it will be appreciated that differently shaped diamonds may also be used, provided that they are set in such a position that they cut in a direction tangential to a helical line passing through the cutting tip of the diamond and having an axis coinciding with the central axis of the diamond bit unit, this tangential direction being taken at the cutting tip of the relevant diamond, and that they are blunt in a direction radial to the central axis of the diamond bit.
- a diamond bit having the diamonds in the sidewall thereof set in accordance with the present invention may be used with advantage in the diamond bit unit described and claimed in copending application No. 839,541, filed July 7, i969 and now US. Pat. No. 3,534,294.
- the diamond bit according to the invention may be used in combination with stabilizers and/or reamers of known design.
- These known stabilizers may for example be of rubber or hard-faced steel and are carried by the drill string at some distance above the diamond bit according to the invention. They will dampen the oscillating movements of the drill string.
- the known reamers, if applied, are also located above the diamond bit according to the invention. Since these known reamers have the characteristic feature of being able to cut in directions radial to the central axis of the reamer, the hole is cut to a diameter greater that the outer diameter of the reamer, which has the advantage that thediamond bit (and the rearner) can be lifted very easily from the hole, or run in.
- a diamond bit for drilling a hole in a subsurface formation said diamond bit having a central axis and comprising:
- each of said sidewall diamonds being positioned at a cutting diameter on the bit body and being set in a blunt position in a direction radial to the central axis of the diamond bit as well as in a cutting position in a direction tangential to a helical line passing through the cutting tip of that sidewall diamond and having a central axis coinciding with the central axis of the diamond bit, this tangential direction being taken at the cutting tip of the sidewall diamond.
- the diamond bit of claim 1 wherein the diamond bit comprises additional diamonds set in the upper part of the sidewall of the bit body which additional diamonds touch a conical plane having a central axis coinciding with the central axis of the diamond bit, this conical plane being arranged with the apex thereof in a direction opposite to the direction in which the bit is axially loaded during operation, said additional diamonds being positioned at cutting diameters no greater than the largest cutting diameter of said first-mentioned sidewall diamonds set in the sidewall of the bit body.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2206169 | 1969-04-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3640356A true US3640356A (en) | 1972-02-08 |
Family
ID=10173275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US884396A Expired - Lifetime US3640356A (en) | 1969-04-30 | 1969-12-12 | Diamond bit |
Country Status (2)
Country | Link |
---|---|
US (1) | US3640356A (ru) |
GB (1) | GB1265071A (ru) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3747699A (en) * | 1971-04-23 | 1973-07-24 | Shell Oil Co | Diamond bit |
US4221270A (en) * | 1978-12-18 | 1980-09-09 | Smith International, Inc. | Drag bit |
US4550790A (en) * | 1983-02-28 | 1985-11-05 | Norton Christensen, Inc. | Diamond rotating bit |
WO1995033911A1 (en) * | 1994-06-07 | 1995-12-14 | Lyng Drilling Products A/S | Drill bit |
US5755298A (en) * | 1995-08-03 | 1998-05-26 | Dresser Industries, Inc. | Hardfacing with coated diamond particles |
US5836409A (en) * | 1994-09-07 | 1998-11-17 | Vail, Iii; William Banning | Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys |
US5868213A (en) * | 1997-04-04 | 1999-02-09 | Smith International, Inc. | Steel tooth cutter element with gage facing knee |
US6547017B1 (en) | 1994-09-07 | 2003-04-15 | Smart Drilling And Completion, Inc. | Rotary drill bit compensating for changes in hardness of geological formations |
CN109630027A (zh) * | 2017-10-06 | 2019-04-16 | 肯纳金属公司 | 薄壁钻地工具及其制造方法 |
US11986974B2 (en) | 2019-03-25 | 2024-05-21 | Kennametal Inc. | Additive manufacturing techniques and applications thereof |
US11998987B2 (en) | 2017-12-05 | 2024-06-04 | Kennametal Inc. | Additive manufacturing techniques and applications thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2708105A (en) * | 1953-08-31 | 1955-05-10 | Jr Edward B Williams | Combination core and plug bit |
US3027952A (en) * | 1958-07-30 | 1962-04-03 | Socony Mobil Oil Co Inc | Drill bit |
US3318399A (en) * | 1965-03-22 | 1967-05-09 | Exxon Production Research Co | Diamond bits and similar tools |
-
1969
- 1969-04-30 GB GB2206169A patent/GB1265071A/en not_active Expired
- 1969-12-12 US US884396A patent/US3640356A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2708105A (en) * | 1953-08-31 | 1955-05-10 | Jr Edward B Williams | Combination core and plug bit |
US3027952A (en) * | 1958-07-30 | 1962-04-03 | Socony Mobil Oil Co Inc | Drill bit |
US3318399A (en) * | 1965-03-22 | 1967-05-09 | Exxon Production Research Co | Diamond bits and similar tools |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3747699A (en) * | 1971-04-23 | 1973-07-24 | Shell Oil Co | Diamond bit |
US4221270A (en) * | 1978-12-18 | 1980-09-09 | Smith International, Inc. | Drag bit |
US4550790A (en) * | 1983-02-28 | 1985-11-05 | Norton Christensen, Inc. | Diamond rotating bit |
WO1995033911A1 (en) * | 1994-06-07 | 1995-12-14 | Lyng Drilling Products A/S | Drill bit |
US5836409A (en) * | 1994-09-07 | 1998-11-17 | Vail, Iii; William Banning | Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys |
US6547017B1 (en) | 1994-09-07 | 2003-04-15 | Smart Drilling And Completion, Inc. | Rotary drill bit compensating for changes in hardness of geological formations |
US5755298A (en) * | 1995-08-03 | 1998-05-26 | Dresser Industries, Inc. | Hardfacing with coated diamond particles |
US5755299A (en) * | 1995-08-03 | 1998-05-26 | Dresser Industries, Inc. | Hardfacing with coated diamond particles |
US5868213A (en) * | 1997-04-04 | 1999-02-09 | Smith International, Inc. | Steel tooth cutter element with gage facing knee |
CN109630027A (zh) * | 2017-10-06 | 2019-04-16 | 肯纳金属公司 | 薄壁钻地工具及其制造方法 |
US11998987B2 (en) | 2017-12-05 | 2024-06-04 | Kennametal Inc. | Additive manufacturing techniques and applications thereof |
US11986974B2 (en) | 2019-03-25 | 2024-05-21 | Kennametal Inc. | Additive manufacturing techniques and applications thereof |
Also Published As
Publication number | Publication date |
---|---|
GB1265071A (ru) | 1972-03-01 |
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