CN113250622A - PDC drill bit with stable tool face for directional drilling - Google Patents
PDC drill bit with stable tool face for directional drilling Download PDFInfo
- Publication number
- CN113250622A CN113250622A CN202110584501.9A CN202110584501A CN113250622A CN 113250622 A CN113250622 A CN 113250622A CN 202110584501 A CN202110584501 A CN 202110584501A CN 113250622 A CN113250622 A CN 113250622A
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- Prior art keywords
- drill bit
- hole
- pdc
- fixed column
- sliding
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- 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.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 2
- 239000003345 natural gas Substances 0.000 abstract 1
- 239000003209 petroleum derivative Substances 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- 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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
-
- 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
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
-
- 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
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
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)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of petroleum and natural gas directional drilling, in particular to a PDC drill bit with a stable tool face for directional drilling, which comprises a PDC drill bit body, wherein the top end face of the PDC drill bit body is provided with an arc face, the bottom end of the PDC drill bit body is provided with a fixed hole, the center of the top end of the PDC drill bit body is provided with a through groove, the inner side surface of the through groove is provided with three sliding grooves which are uniformly distributed, the top end inside the fixed hole is provided with a fixed sleeve, the inner side bottom end of the fixed sleeve is provided with a guide rod, the surface of the fixed sleeve is provided with three sliding cavities, the inner side of the through groove is provided with a fixed column, the bottom end of the fixed column is provided with a guide hole, the outer side of the guide rod is provided with a spring, the top end of the fixed column is provided with a positioning drill bit, the outer side of the fixed column is provided with three sliding blocks, the inner side of the through groove is provided with the fixed column, and the top end of the fixed column is provided with a positioning drill bit, the PDC drill bit has the effect of better stabilizing the tool face.
Description
Technical Field
The invention relates to the technical field of petroleum, in particular to a PDC drill bit with a stable tool face for directional drilling.
Background
As is known, the PDC drill bit for directional drilling is used not only in a straight well section but also in a deflecting section, a steady deflecting section, and a declining deflecting section in a directional well, which puts high demands on the PDC drill bit for directional drilling: 1) when drilling in a vertical well section, the drilling tool has certain well deviation control capability; 2) sufficient deflecting capacity is required during deflecting; 3) when the inclination is stabilized, the well inclination can be controlled within a certain angle; 4) the well deviation can be reduced during the deviation reduction; 5) to have a stable tool face, the tool face is less fluctuated and the orientation is easy to control when various orientation operations are performed.
When the conventional PDC drill bit is used for directional drilling, the torque is large, the tool face is unstable, the applied bit pressure is small, the mechanical drilling speed is low, and the requirement of the directional drilling cannot be met, so that the PDC drill bit for the directional drilling with the stable tool face is urgently needed in the prior art.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the PDC drill bit for directional drilling, which can better stabilize the tool face.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a PDC drill bit with a stable tool face for directional drilling comprises a PDC drill bit body, wherein the top end face of the PDC drill bit body is an arc face, a fixing hole is formed in the bottom end of the PDC drill bit body, three through holes A which are uniformly distributed are formed in the top end of the PDC drill bit body, a through groove is formed in the center of the top end of the PDC drill bit body, three sliding grooves which are uniformly distributed are formed in the inner side surface of the through groove, the three sliding grooves penetrate through the top end of the PDC drill bit body to the inside of the fixing hole, a fixing sleeve is arranged at the top end of the inside of the fixing hole, a guide rod is arranged at the bottom end of the inside of the fixing sleeve, three sliding cavities are formed in the surface of the fixing sleeve, the three sliding grooves are respectively matched with the three sliding cavities, a fixing column is arranged inside the through groove, a guide hole is formed in the bottom end of the fixing column, the guide rod is matched with the guide hole, and a spring is arranged outside the guide rod, the top of fixed column is provided with the location drill bit, and the outside of fixed column is provided with three sliding block, and three sliding block sets up respectively in the inside of sliding tray to be sliding fit.
Further, the inside of fixed column and location drill bit is provided with three connecting holes of evenly arranging respectively to every connecting block all is the through state, set up in the inside three connecting holes of fixed column respectively with set up in the inside connecting hole phase-match of location drill bit, fixed sleeve's bottom is provided with three through-hole B of evenly arranging, the inboard that is located the inside three connecting holes of fixed column all is provided with the cooling tube, and the bottom of three cooling tube passes connecting hole and the through-hole B that is located the inside of location drill bit respectively.
Further, the bottom circumference surface of location drill bit is provided with three through-hole C of evenly arranging to through-hole C runs through to the inside that is located location drill bit internal connection hole in the outside of location drill bit, and three through-hole C is the counter sink, and three through-hole C's inboard surface all is provided with the screw thread, and three through-hole C's inside all is connected with the bolt, and three bolt contacts with three water pipes respectively.
Furthermore, the top of the three connecting holes in the positioning drill bit is provided with a gauze.
Further, the outside surface of fixed column is provided with three layer board to the inboard middle part that leads to the groove is provided with three fixed slot, and three layer board is located the inside of fixed slot respectively.
Furthermore, three spiral grooves are formed in the outer side surface of the positioning drill bit and are uniformly distributed.
Furthermore, the edges and corners of the positioning drill bit are all set to be round corners.
Furthermore, the cross sections of the three sliding blocks are all T-shaped, and the shapes of the three sliding grooves and the sliding cavities are the same as those of the sliding blocks.
Furthermore, the connection mode between the fixing column and the positioning drill bit is welding.
(III) advantageous effects
Compared with the prior art, the PDC drill bit for directional drilling with the stable tool face has the following beneficial effects:
this PDC drill bit for directional drilling with stabilize instrument face, inboard through leading to the groove is provided with the fixed column, the top of fixed column is provided with the location drill bit, make this PDC drill bit have the effect of better stable instrument face, bottom through the fixed column is provided with the guiding hole, guide bar and guiding hole cooperate, the outside of guide bar is provided with the spring, make the spring have better direction effect when the compression, the outside through the fixed column is provided with three sliding block, three sliding block sets up respectively in the inside of sliding tray, and be sliding fit, make the fixed column slide from top to bottom, can alleviate the working strength of location drill bit, increase the life of location drill bit.
Drawings
FIG. 1 is an isometric view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic front cross-sectional view of the present invention;
FIG. 4 is an isometric view of the pilot bit of FIG. 1 according to the present invention;
FIG. 5 is an isometric view of the PDC bit body shown in FIG. 1 of the present invention;
FIG. 6 is a schematic cross-sectional view of the pilot bit of FIG. 1 according to the present invention;
FIG. 7 is an enlarged, fragmentary, schematic view of FIG. 1 at A in accordance with the present invention;
FIG. 8 is an enlarged, fragmentary, schematic structural view of FIG. 3 at B;
FIG. 9 is an enlarged, fragmentary, schematic view of the invention at C of FIG. 5;
fig. 10 is a partially enlarged structural view of the invention shown at D in fig. 6.
In the figure: 1. a PDC bit body; 2. fixing the sleeve; 3. a through groove; 4. a guide bar; 5. a sliding cavity; 6. fixing a column; 7. a sliding groove; 8. a spring; 9. positioning the drill bit; 10. a slider; 11. a support plate; 12. a helical groove; 13. a cooling tube; 14. a bolt; 15. a gauze.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-10, the PDC drill bit for directional drilling with a stable tool face of the present invention includes a PDC drill bit body 1, the top end face of the PDC drill bit body 1 is configured as an arc face, the bottom end of the PDC drill bit body 1 is provided with a fixing hole, the top end of the PDC drill bit body 1 is provided with three through holes a uniformly arranged, the through holes a penetrate through the top end of the PDC drill bit body 1 to the inside of the fixing hole, the top end center of the PDC drill bit body 1 is provided with a through groove 3, the through groove 3 penetrates through the top end of the PDC drill bit body 1 to the inside of the fixing hole, the inner side surface of the through groove 3 is provided with three sliding grooves 7 uniformly arranged, and all the three sliding grooves 7 penetrate through the top end of the PDC drill bit body 1 to the inside of the fixing hole, the top end of the inside of the fixing hole is provided with a fixing sleeve 2, the bottom end of the inside of the fixing sleeve 2 is provided with a guide rod 4, the surface of the fixing sleeve 2 is provided with three sliding cavities 5, and the three sliding grooves 7 are respectively matched with the three sliding cavities 5, the inner side of the through groove 3 is provided with a fixed column 6, the bottom end of the fixed column 6 is provided with a guide hole, the guide rod 4 is matched with the guide hole, the outer side of the guide rod 4 is provided with a spring 8, the top end of the fixed column 6 is provided with a positioning drill bit 9, the outer side of the fixed column 6 is provided with three sliding blocks 10, the three sliding blocks 10 are respectively arranged inside the sliding grooves 7 and are in sliding fit, when the PDC drill bit body 1 is used for rotary drilling, the positioning drill bit 9 is firstly contacted with the ground and is turned out of a positioning hole, so that the PDC drill bit body 1 is used for drilling with higher precision, when soil is hard, the positioning drill bit 9 can slide up and down through the matching between the spring 8 and the fixed column 6, the working degree of the positioning drill bit 9 can be reduced, and the service life of the positioning drill bit 9 can be prolonged, be provided with fixed column 6 through the inboard that leads to groove 3, the top of fixed column 6 is provided with location drill bit 9 for this PDC drill bit has the effect of better stabilizing the instrument face.
Wherein, the inside of fixed column 6 and location drill bit 9 is provided with three connecting holes of evenly arranging respectively, and every connecting block all is the run-through state, set up in three connecting holes of fixed column 6 inside respectively with set up in the connecting hole phase-match of location drill bit 9 inside, the bottom of fixed sleeve 2 is provided with three through-hole B of evenly arranging, the inboard that is located three connecting holes of fixed column 6 inside all is provided with cooling tube 13, and the bottom of three cooling tube 13 passes connecting hole and through-hole B that are located location drill bit 9 inside respectively, make cooling tube 13 can spray the coolant liquid and reduce the surface temperature of location drill bit 9, the life of location drill bit 9 is increased.
Wherein, the bottom circumference surface of location drill bit 9 is provided with three through-hole C of evenly arranging to through-hole C runs through to the inside that is located location drill bit internal connection hole in the outside of location drill bit 9, and three through-hole C is the counter sink, and the inside surface of three through-hole C all is provided with the screw thread, and the inside of three through-hole C all is connected with bolt 14, and three bolt 14 contacts with three cooling tube 13 respectively, makes bolt 14 and through-hole C carry out the fixed cooling tube 13 that threaded connection can be more convenient.
The gauze 15 is arranged at the tops of the three connecting holes in the positioning drill bit 9, so that the gauze 15 can prevent larger soil blocks from blocking the connecting holes.
Wherein, the outside surface of fixed column 6 is provided with three layer board 11 to the inboard middle part that leads to groove 3 is provided with three fixed slot, and three layer board 11 is located the inside of fixed slot respectively, makes the cooperation between layer board 11 and the fixed slot can prevent that fixed column 6 from breaking away from the inside that leads to groove 3.
The outer side surface of the positioning drill bit 9 is provided with three spiral grooves 12, and the three spiral grooves 12 are uniformly distributed, so that the resistance of the positioning block during drilling is reduced.
Wherein, the edges and corners of the positioning drill bit 9 are all set to be fillets, so that the fillets can prevent the positioning drill bit 9 from collapsing.
The cross sections of the three sliding blocks 10 are all in a T shape, and the shapes of the three sliding grooves 7 and the sliding cavities 5 are the same as those of the sliding blocks 10, so that the sliding blocks 10, the sliding grooves 7 and the sliding cavities 5 are matched with each other to have higher precision.
The connection mode between the fixing column 6 and the positioning drill bit 9 is welding, so that the fixing column 6 and the positioning drill bit 9 have better connectivity.
In conclusion, this PDC drill bit for directional drilling with stable instrument face, when using, install positioning bit 9 in external drilling machine, carry out the drilling, positioning bit 9 contacts with ground earlier, and go out the locating hole, make PDC drill bit body 1 drilling have higher precision, when the soil is hard, positioning bit 9 passes through the cooperation between spring 8 and the fixed column 6, make positioning bit 9 slide from top to bottom, can alleviate positioning bit 9's work degree, increase positioning bit 9's life, when positioning bit 9 temperature is higher needs the cooling down, with the inside of cooling tube 13, and spray at positioning bit 9's top through cooling tube 13, thereby make cooling tube 13 can spray the cooling liquid and reduce positioning bit 9's surface temperature.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A PDC bit for directional drilling with a stable toolface, comprising a PDC bit body (1), characterized in that: the top end face of the PDC drill bit body (1) is set to be an arc face, the bottom end of the PDC drill bit body (1) is provided with a fixing hole, the top end of the PDC drill bit body (1) is provided with three through holes A which are uniformly distributed, the top end center of the PDC drill bit body (1) is provided with a through groove (3), the inner side surface of the through groove (3) is provided with three sliding grooves (7) which are uniformly distributed, the three sliding grooves (7) penetrate through the top end of the PDC drill bit body (1) to the inside of the fixing hole, the top end inside the fixing hole is provided with a fixing sleeve (2), the inner side bottom end of the fixing sleeve (2) is provided with a guide rod (4), the surface of the fixing sleeve (2) is provided with three sliding cavities (5), the three sliding grooves (7) are respectively matched with the three sliding cavities (5), and the inner side of the through groove (3) is provided with a fixing column (6), and the bottom of fixed column (6) is provided with the guiding hole, guide bar (4) and guiding hole cooperate to the outside of guide bar (4) is provided with spring (8), the top of fixed column (6) is provided with location drill bit (9), the outside of fixed column (6) is provided with three sliding block (10), and three sliding block (10) set up respectively in the inside of sliding tray (7) to be sliding fit.
2. The PDC bit for directional drilling with a stable toolface of claim 1, wherein: the inside of fixed column (6) and location drill bit (9) is provided with three connecting holes of evenly arranging respectively to every connecting block all is the run-through state, sets up in three connecting holes of fixed column (6) inside respectively with set up in the inside connecting hole phase-match of location drill bit (9), the bottom of fixed sleeve (2) is provided with three through-holes B of evenly arranging, and the inboard that is located three connecting holes of fixed column (6) inside all is provided with cooling tube (13), and the bottom of three cooling tube (13) passes connecting hole and the through-hole B that is located location drill bit (9) inside respectively.
3. The PDC bit for directional drilling with a stable toolface of claim 2, wherein: the bottom circumference surface of location drill bit (9) is provided with three through-hole C of evenly arranging to through-hole C runs through to the inside that is located location drill bit internal connection hole in the outside of location drill bit (9), and is three through-hole C is the counter bore, and three through-hole C's inboard surface all is provided with the screw thread, and is three through-hole C's inside all is connected with bolt (14), and three bolt (14) contact with three cooling tube (13) respectively.
4. The PDC drill bit for directional drilling having a stable toolface of claim 3, wherein: and gauze (15) are arranged at the tops of the three connecting holes in the positioning drill bit (9).
5. The PDC bit for directional drilling with a stable toolface of claim 1, wherein: the outer side surface of the fixing column (6) is provided with three supporting plates (11), the middle part of the inner side of the through groove (3) is provided with three fixing grooves, and the three supporting plates (11) are respectively positioned inside the fixing grooves.
6. The PDC bit for directional drilling with a stable toolface of claim 1, wherein: the outer side surface of the positioning drill bit (9) is provided with three spiral grooves (12), and the three spiral grooves (12) are uniformly distributed.
7. The PDC drill bit for directional drilling having a stable toolface of claim 3, wherein: the edges and corners of the positioning drill bit (9) are all set to be round corners.
8. The PDC bit for directional drilling with a stable toolface of claim 1, wherein: the cross sections of the three sliding blocks (10) are all T-shaped, and the shapes of the three sliding grooves (7) and the sliding cavities (5) are the same as the shape of the sliding blocks (10).
9. The PDC bit for directional drilling with a stable toolface of claim 1, wherein: the fixed column (6) and the positioning drill bit (9) are connected in a welding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110584501.9A CN113250622A (en) | 2021-05-27 | 2021-05-27 | PDC drill bit with stable tool face for directional drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110584501.9A CN113250622A (en) | 2021-05-27 | 2021-05-27 | PDC drill bit with stable tool face for directional drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113250622A true CN113250622A (en) | 2021-08-13 |
Family
ID=77184815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110584501.9A Pending CN113250622A (en) | 2021-05-27 | 2021-05-27 | PDC drill bit with stable tool face for directional drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113250622A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203374211U (en) * | 2013-06-29 | 2014-01-01 | 西北矿冶研究院 | Rotary positioning fast-advancing drill bit |
| CN105156039A (en) * | 2015-07-07 | 2015-12-16 | 西南石油大学 | Driving retractable combination drill bit |
| CN205089223U (en) * | 2015-09-13 | 2016-03-16 | 盛铁丰 | Oil prospecting drill bit |
| CN106703701A (en) * | 2017-01-20 | 2017-05-24 | 中国石油大学(华东) | Pulse impact producing mechanism and center differential pressure drill comprising same |
| CN109594927A (en) * | 2018-12-21 | 2019-04-09 | 巴州大朴石油技术服务有限公司 | A kind of elastic drill bit for oil exploitation |
| CN109915028A (en) * | 2019-04-23 | 2019-06-21 | 西南石油大学 | The motor-driven double speed PDC drill bit of battery type |
| CN110678621A (en) * | 2017-03-07 | 2020-01-10 | J·M·伊夫 | Hybrid drill bit comprising an earth-boring element and a percussion element for drilling an earth formation |
| CN112177535A (en) * | 2020-09-18 | 2021-01-05 | 湖州鸿盈机械有限公司 | Drill bit with prolonged service life and improved efficiency |
-
2021
- 2021-05-27 CN CN202110584501.9A patent/CN113250622A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203374211U (en) * | 2013-06-29 | 2014-01-01 | 西北矿冶研究院 | Rotary positioning fast-advancing drill bit |
| CN105156039A (en) * | 2015-07-07 | 2015-12-16 | 西南石油大学 | Driving retractable combination drill bit |
| CN205089223U (en) * | 2015-09-13 | 2016-03-16 | 盛铁丰 | Oil prospecting drill bit |
| CN106703701A (en) * | 2017-01-20 | 2017-05-24 | 中国石油大学(华东) | Pulse impact producing mechanism and center differential pressure drill comprising same |
| CN110678621A (en) * | 2017-03-07 | 2020-01-10 | J·M·伊夫 | Hybrid drill bit comprising an earth-boring element and a percussion element for drilling an earth formation |
| CN109594927A (en) * | 2018-12-21 | 2019-04-09 | 巴州大朴石油技术服务有限公司 | A kind of elastic drill bit for oil exploitation |
| CN109915028A (en) * | 2019-04-23 | 2019-06-21 | 西南石油大学 | The motor-driven double speed PDC drill bit of battery type |
| CN112177535A (en) * | 2020-09-18 | 2021-01-05 | 湖州鸿盈机械有限公司 | Drill bit with prolonged service life and improved efficiency |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20210813 |