CN110185385B - Double-drill hollow push-pull system for torque self-balancing drilling tool system - Google Patents
Double-drill hollow push-pull system for torque self-balancing drilling tool system Download PDFInfo
- Publication number
- CN110185385B CN110185385B CN201910387265.4A CN201910387265A CN110185385B CN 110185385 B CN110185385 B CN 110185385B CN 201910387265 A CN201910387265 A CN 201910387265A CN 110185385 B CN110185385 B CN 110185385B
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- push
- pull
- torque motor
- central shaft
- torque
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- 238000005553 drilling Methods 0.000 title claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims description 23
- 230000009977 dual effect Effects 0.000 claims 5
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 244000208734 Pisonia aculeata Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000036346 tooth eruption Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/003—Bearing, sealing, lubricating details
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/04—Electric drives
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)
Abstract
The double-bit hollow push-pull system for the torque self-balancing drilling tool system belongs to the field of drilling and boring and comprises a hollow inner shaft, an upper connecting bolt, a torque motor, a push-pull central shaft and a lower pressure transmission assembly, wherein the hollow inner shaft, the push-pull central shaft and the torque motor are sleeved from inside to outside and are coaxial, a sliding key on the push-pull central shaft is connected with a sliding groove on a rotor of the torque motor in a matched manner, and the push-pull central shaft is connected with the hollow inner shaft through an internal thread; the lower pressure transmission assembly is connected with the lower end of the push-pull central shaft, and the hollow structure of the electric push rod is realized by utilizing the characteristic that the screw connection can transmit torque and axial force, so that the hollow structure of the electric push rod can be used for storing cables and conveying liquid.
Description
Technical Field
The invention belongs to the field of drilling and boring, relates to a push-pull device, and particularly relates to a double-drill hollow push-pull system for a torque self-balancing drilling tool system.
Background
In the drilling process of the well, the drill stem is deformed into a spiral shape under the action of torque, and the drill stem is easily damaged in advance due to collision friction with the well wall in the rotation process, abrasion and alternating load action, so that accidents in the well such as drilling tool breakage and the like occur, and huge losses are brought to the whole engineering. With the increase of drilling depth, the length of the drill string is lengthened, the proportion of energy lost by various friction resistances in the drill rod overcomes the well in the process of transmitting the weight and torque is increased, so that an upper drilling machine is required to provide larger torque, when the well depth reaches a certain depth, a downhole power tool is required to be added at a position close to the drill bit to provide torque for high-speed rotation of the drill bit, and the upper drill string slowly rotates to provide reactive torque for the drill bit through the top drive of the ground turntable. Obviously, the reaction torque generated by the rotary rock breaking of the drilling tool in the well damages the whole drill string and the ground equipment, and the drilling process can be smoothly implemented only by firstly meeting the environment condition of the reaction torque. The independent drill bit is used for crushing rock and simultaneously needs surrounding rock to provide corresponding anti-torsion moment for the rock contacted with the drill bit, so that the requirement on surrounding rock of the well wall is high. If the drill bit encounters broken stratum, the inherent binding force of surrounding rock can not provide enough anti-torque for the rock contacted by the drill bit to form a block structure to separate from the well wall, and the circulating slurry rotates along with the drill string to generate local turbulence to stir the well wall, so that the well hole is expanded, and when the drill bit encounters hard large-particle gritty, the drill bit easily enters the water gap of the drill bit due to sliding of the gravel and is bridged with other gravels to generate great torque, so that the collapse of cutting teeth of the drill bit is easily caused. Aiming at the technical difficulties and defects of more accidents and high cost in the prior well, the underground torque self-balancing cabled drilling tool system is necessary to provide, so as to fundamentally solve the reactive torque hazard generated by rotary drilling of a drill string, change the disturbance intensity of unidirectional broken rock of a drill bit to surrounding rock, simplify ground drilling equipment and matched tools and technological methods, realize the purposes of less accidents in the well, low drilling cost, low energy consumption, high drilling efficiency and the like, and the drill bit plays a decisive role in improving the drilling rate of mechanical drilling when being used as a tool for breaking rock in drilling operation, and the service life and the performance of the drill bit directly influence the quality, the speed and the comprehensive cost of drilling engineering. The precondition for the self-balancing of the torque of the underground double drill bits is that the drilling pressure of the inner drill bit and the outer drill bit is regulated in real time. The function can be realized through the electric push rod, the existing electric push rods on the market are basically solid, the push-out force is large, the pull-back force is small, and the requirement of a torque self-balancing drilling tool system cannot be well met, so that a set of hollow electric push-pull system capable of storing cables or circulating drilling fluid is very necessary.
Disclosure of Invention
The invention aims to provide a double-drill hollow push-pull system for a torque self-balancing drilling tool system, which realizes the hollowness of an electric push-pull device, so that the electric push-pull device can be used for storing cables and conveying liquid.
In order to achieve the above object, the present invention provides a dual-bit hollow push-pull system for a torque self-balancing drilling tool system, which is characterized in that the dual-bit hollow push-pull system comprises: the device comprises a hollow inner shaft, an upper connecting bolt, a torque motor, a push-pull central shaft and a lower pressure transmission assembly, wherein the hollow inner shaft, the push-pull central shaft and the torque motor are sleeved from inside to outside and are coaxial; the torque motor comprises a torque motor rotor, a torque motor stator, an upper connecting sealing cover, a lower connecting sealing cover and a torque motor bearing, wherein a chute which is axially arranged along the torque motor rotor is arranged in the torque motor rotor, the upper end of the torque motor rotor is contacted with the upper connecting sealing cover through the torque motor bearing, and the lower end of the torque motor rotor is contacted with the lower connecting sealing cover through the torque motor bearing; the push-pull central shaft is positioned between the torque motor rotor and the hollow inner shaft, internal threads are arranged in the push-pull central shaft, sliding keys are arranged outside the push-pull central shaft, the sliding keys on the push-pull central shaft are connected with sliding grooves on the torque motor rotor in a matched mode, and the push-pull central shaft is connected with the hollow inner shaft through the internal threads; the upper end of the hollow inner shaft is provided with a first external thread for connecting an upper drilling tool, a first threaded hole is arranged below the first external thread, the first threaded hole is connected with a second threaded hole on an upper connecting sealing cover through a connecting bolt, the middle part of the hollow inner shaft is provided with a second external thread, and the hollow inner shaft is in threaded fit with an internal thread positioned in the push-pull central shaft through the second external thread arranged on the hollow inner shaft; the lower pressure transmission assembly is connected with the lower end of the push-pull central shaft, and comprises a lower pressure transmission bearing, a first lower pressure transmission bearing anti-falling part, a lower force transmission joint and a second lower pressure transmission bearing anti-falling part, wherein the lower force transmission joint, the first lower pressure transmission bearing anti-falling part, the second lower pressure transmission bearing anti-falling part and the push-pull central shaft are sequentially and hermetically connected from outside to inside; the inner ring of the lower pressure transmission bearing is connected with the push-pull central shaft in an interference fit manner, the outer ring of the lower pressure transmission bearing is connected with the lower force transmission joint in an interference fit manner, and the lower part of the lower force transmission joint is provided with external threads for connecting with a lower self-balancing drilling tool.
The lower part of the hollow inner shaft is provided with a clamping groove for placing an O-shaped rubber sealing ring.
The number of the clamping grooves is three.
The number of the sliding grooves is two.
The number of the sliding keys is the same as that of the sliding grooves, and the sliding keys are in one-to-one correspondence.
The number of the first threaded holes is four, and the four first threaded holes are uniformly distributed along the circumferential direction of the hollow inner shaft.
The number of the first threaded holes is the same as that of the second threaded holes, and the first threaded holes and the second threaded holes are in one-to-one correspondence.
Through the design scheme, the invention has the following beneficial effects: the invention utilizes the characteristic that the screw connection can transmit torque and axial force, and realizes the hollowness of the electric push rod, so that the electric push rod can be used for storing cables and conveying liquid.
Drawings
Fig. 1 is a schematic view of the external appearance structure of a double-bit hollow push-pull system for a torque self-balancing drilling tool system according to an embodiment of the invention.
Fig. 2 is a schematic view of the A-A cross section of fig. 1.
Fig. 3 is a schematic view of the B-B cross section of fig. 1.
Fig. 4 is a schematic cross-sectional view of the hollow shaft in an embodiment of the invention.
FIG. 5 is a schematic cross-sectional view of a push-pull central shaft in an embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view of a torque motor in accordance with an embodiment of the present invention.
FIG. 7 is a schematic illustration of the manner in which the push-pull central shaft cooperates with the hollow inner shaft and the torque motor rotor, respectively, in an embodiment of the present invention.
FIG. 8 is a schematic illustration of the manner in which the push-pull central shaft cooperates with the hollow inner shaft and the torque motor, respectively, in an embodiment of the present invention.
The components in the drawings are marked as follows: 1-a hollow inner shaft; 2-an upper connecting bolt; 3-upper connecting sealing cover; 4-torque motor bearings; 5-pushing and pulling the central shaft; 6-torque motor rotor; 7-torque motor stator; 8-lower connecting sealing cover; 9-pressing down the bearing; 10-a first downward pressure-transmitting bearing anti-falling piece; 11-lower force transmission joint; 12-a second downward pressure-transmitting bearing anti-falling piece; 101-a first external thread; 102-a first threaded hole; 103-second external threads; 104-clamping grooves; 301-a second threaded hole; 501-sliding key; 502-internal threads; 503-external threads; 601-a chute; 801-lower external thread.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention. In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and that the features defining "first" and "second" are not necessarily indicative of any order, quantity, or importance, but are merely used to distinguish between different components.
Referring to fig. 1, 2, 3, 4, 5, 6, 7 and 8, the present invention provides a dual-bit hollow push-pull system for a torque self-balancing drilling tool system, comprising: the hollow inner shaft 1, the upper connecting bolt 2, the upper connecting sealing cover 3, the torque motor, the push-pull central shaft 5 and the lower pressure transmission assembly are arranged in a coaxial manner from inside to outside; the torque motor comprises a torque motor rotor 6, a torque motor stator 7, an upper connecting sealing cover 3, a lower connecting sealing cover 8 and a torque motor bearing 4, wherein two sliding grooves 601 are formed in the torque motor rotor 6, each sliding groove 601 is axially arranged along the torque motor rotor 6, the upper end of the torque motor rotor 6 is contacted with the upper connecting sealing cover 3 through the torque motor bearing 4, the lower end of the torque motor rotor 6 is contacted with the lower connecting sealing cover 8 through the torque motor bearing 4, the torque motor rotor 6 is used for fixing the position of the torque motor rotor 6 and ensuring that the torque motor rotor 6 can freely rotate, and lower external threads 801 are formed in the lower part of the lower connecting sealing cover 8 and are used for connecting a lower drilling tool; the push-pull central shaft 5 is positioned between the torque motor rotor 6 and the hollow inner shaft 1, a section of internal thread 502 is arranged in the push-pull central shaft 5, two sections of sliding keys 501 are arranged outside the push-pull central shaft 5, external threads 503 are arranged at the lower part of the push-pull central shaft 5, the sliding keys 501 on the push-pull central shaft 5 are connected with a sliding groove 601 on the torque motor rotor 6 in a matched manner, and meanwhile, the push-pull central shaft 5 is connected with the hollow inner shaft 1 through the internal thread 502; the upper end of the hollow inner shaft 1 is provided with a section of first external thread 101 for connecting an upper drilling tool, four first threaded holes 102 are uniformly distributed below the first external thread 101 along the circumferential direction of the hollow inner shaft 1, the four first threaded holes 102 are connected with four corresponding second threaded holes 301 on the upper connecting sealing cover 3 through four upper connecting bolts 2, the middle part of the hollow inner shaft 1 is provided with a section of second external thread 103, and the hollow inner shaft 1 is in threaded fit with an internal thread 502 in the push-pull central shaft 5 through the second external thread 103;
the lower pressure transmission assembly is connected with the lower end of the push-pull central shaft 5 through external threads 503, the lower pressure transmission assembly comprises a lower pressure transmission bearing 9, a first lower pressure transmission bearing anti-drop piece 10, a lower force transmission joint 11 and a second lower pressure transmission bearing anti-drop piece 12, wherein the lower force transmission joint 11, the first lower pressure transmission bearing anti-drop piece 10, the second lower pressure transmission bearing anti-drop piece 12 and the push-pull central shaft 5 are sequentially and hermetically connected from outside to inside, an inner ring of the lower pressure transmission bearing 9 is in interference fit connection with the push-pull central shaft 5, an outer ring of the lower pressure transmission bearing 9 is in interference fit connection with the lower force transmission joint 11, and external threads are arranged at the lower part of the lower force transmission joint 11 and are used for being connected with a lower self-balancing drilling tool; when the push-pull central shaft 5 is axially displaced during operation, although the push-pull central shaft is accompanied by rotation, due to the action of the lower pressure transmission bearing 9, the first lower pressure transmission bearing anti-drop piece 10 and the lower force transmission joint 11 can not rotate, so that the lower pressure transmission assembly is ensured to only transmit axial force and displacement to the lower drilling tool during operation of the hollow push-pull system;
when the double-drill hollow push-pull system for the torque self-balancing drilling tool system provided by the invention works, the torque motor rotor 6 transmits the generated torque to the push-pull central shaft 5 matched with the torque motor rotor 6 through the sliding key 501 at the moment to drive the push-pull central shaft 5 to rotate together, and the push-pull central shaft 5 and the fixed hollow inner shaft 1 are in threaded connection, and the push-pull central shaft 5 can generate relative motion with the torque motor rotor 6 restrained in the axial direction through the sliding groove 601, so that the push-pull central shaft 5 can spirally descend along the preset second external threads 103 on the hollow inner shaft 1, the hollow inner shaft 1 is subjected to a torque and an axial force, and in the same way, if the push-pull central shaft 5 is required to be lifted upwards, only the current direction passing through the torque motor is required to be changed to enable the torque motor rotor 6 to reversely rotate.
The invention provides a double-drill hollow push-pull system for a torque self-balancing drilling tool system, wherein the lower part of a hollow inner shaft 1 is also provided with three clamping grooves 104 for placing O-shaped rubber sealing rings, when drilling fluid flows in the hollow inner shaft 1, a waterproof bearing is selected as a downward pressure transmission bearing 9, and the three preset clamping grooves 104 are respectively provided with a proper wear-resistant O-shaped rubber sealing ring, so that leakage when the fluid passes through a central channel of the hollow inner shaft 1 is prevented.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. A dual-bit hollow push-pull system for a torque self-balancing drilling tool system, the dual-bit hollow push-pull system comprising: the device comprises a hollow inner shaft (1), an upper connecting bolt (2), a torque motor, a push-pull central shaft (5) and a lower pressure transmission assembly, wherein the hollow inner shaft (1), the push-pull central shaft (5) and the torque motor are sleeved from inside to outside and are coaxial; the torque motor comprises a torque motor rotor (6), a torque motor stator (7), an upper connecting sealing cover (3), a lower connecting sealing cover (8) and a torque motor bearing (4), wherein a chute (601) which is axially arranged along the torque motor rotor is arranged inside the torque motor rotor (6), the upper end of the torque motor rotor (6) is contacted with the upper connecting sealing cover (3) through the torque motor bearing (4), and the lower end of the torque motor rotor (6) is contacted with the lower connecting sealing cover (8) through the torque motor bearing (4); the push-pull central shaft (5) is positioned between the torque motor rotor (6) and the hollow inner shaft (1), an internal thread (502) is arranged in the push-pull central shaft (5), a sliding key (501) is arranged outside the push-pull central shaft (5), the sliding key (501) on the push-pull central shaft (5) is connected with a sliding groove (601) on the torque motor rotor (6) in a matched mode, and the push-pull central shaft (5) is connected with the hollow inner shaft (1) through the internal thread (502); the upper end of the hollow inner shaft (1) is provided with a first external thread (101) for connecting an upper drilling tool, a first threaded hole (102) is formed below the first external thread (101), the first threaded hole (102) is connected with a second threaded hole (301) on the upper connecting sealing cover (3) through a connecting bolt (2), the middle part of the hollow inner shaft (1) is provided with a second external thread (103), and the hollow inner shaft (1) is in threaded fit with an internal thread (502) positioned in the push-pull central shaft (5) through the second external thread (103) arranged on the hollow inner shaft; the lower pressure transmission assembly is connected with the lower end of the push-pull central shaft (5), and comprises a lower pressure transmission bearing (9), a first lower pressure transmission bearing anti-falling part (10), a lower force transmission joint (11) and a second lower pressure transmission bearing anti-falling part (12), wherein the lower force transmission joint (11), the first lower pressure transmission bearing anti-falling part (10), the second lower pressure transmission bearing anti-falling part (12) and the push-pull central shaft (5) are sequentially and hermetically connected from outside to inside; the inner ring of the lower pressure transmission bearing (9) is connected with the push-pull central shaft (5) in an interference fit manner, the outer ring of the lower pressure transmission bearing (9) is connected with the lower force transmission joint (11) in an interference fit manner, and the lower part of the lower force transmission joint (11) is provided with external threads for connecting with a lower self-balancing drilling tool.
2. A double-bit hollow push-pull system for a torque self-balancing drilling tool system according to claim 1, characterized in that the lower part of the hollow inner shaft (1) is provided with a clamping groove (104) for placing an O-shaped rubber sealing ring.
3. A dual bit hollow push-pull system for a torque self balancing drilling system according to claim 2, wherein the number of said detents (104) is three.
4. A dual bit hollow push-pull system for a torque self balancing drilling system according to claim 1, wherein the number of runners (601) is two.
5. A dual bit hollow push-pull system for a torque self balancing drilling system according to claim 1 or 4, wherein the number of sliding keys (501) is the same as the number of sliding grooves (601) and corresponds one to one.
6. A dual bit hollow push-pull system for a torque self balancing drilling system according to claim 1, characterized in that the number of the first threaded holes (102) is four, and the four first threaded holes (102) are uniformly arranged along the circumferential direction of the hollow inner shaft (1).
7. A dual bit hollow push-pull system for a torque self balancing drilling system according to claim 1, wherein the number of first threaded holes (102) is the same as the number of second threaded holes (301) and corresponds one to one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910387265.4A CN110185385B (en) | 2019-05-10 | 2019-05-10 | Double-drill hollow push-pull system for torque self-balancing drilling tool system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910387265.4A CN110185385B (en) | 2019-05-10 | 2019-05-10 | Double-drill hollow push-pull system for torque self-balancing drilling tool system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110185385A CN110185385A (en) | 2019-08-30 |
| CN110185385B true CN110185385B (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910387265.4A Active CN110185385B (en) | 2019-05-10 | 2019-05-10 | Double-drill hollow push-pull system for torque self-balancing drilling tool system |
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| CN (1) | CN110185385B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761480A (en) * | 2017-02-16 | 2017-05-31 | 吉林大学 | A kind of underground moment of torsion self-balancing has cable drilling system |
| CN106869806A (en) * | 2017-03-20 | 2017-06-20 | 吉林大学 | A kind of double drill bits of moment of torsion self-balancing nested type |
| CN107795273A (en) * | 2017-11-21 | 2018-03-13 | 吉林大学 | A kind of double torque-on-bit self-balancing pressure-regulating devices |
| CN109555495A (en) * | 2019-01-17 | 2019-04-02 | 吉林大学 | Underground torque self-balancing has the unfreezing system and releasing method of cable drilling tool |
| CN209799863U (en) * | 2019-05-10 | 2019-12-17 | 吉林大学 | Double-drill-bit hollow push-pull system for torque self-balancing drilling tool system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150093189A1 (en) * | 2013-10-01 | 2015-04-02 | Baker Hughes Incorporated | Multi-start thread connection for downhole tools |
-
2019
- 2019-05-10 CN CN201910387265.4A patent/CN110185385B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761480A (en) * | 2017-02-16 | 2017-05-31 | 吉林大学 | A kind of underground moment of torsion self-balancing has cable drilling system |
| CN106869806A (en) * | 2017-03-20 | 2017-06-20 | 吉林大学 | A kind of double drill bits of moment of torsion self-balancing nested type |
| CN107795273A (en) * | 2017-11-21 | 2018-03-13 | 吉林大学 | A kind of double torque-on-bit self-balancing pressure-regulating devices |
| CN109555495A (en) * | 2019-01-17 | 2019-04-02 | 吉林大学 | Underground torque self-balancing has the unfreezing system and releasing method of cable drilling tool |
| CN209799863U (en) * | 2019-05-10 | 2019-12-17 | 吉林大学 | Double-drill-bit hollow push-pull system for torque self-balancing drilling tool system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110185385A (en) | 2019-08-30 |
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