CN101871328B - Planetary bit assembly for balancing reactive torque of drilling equipment in well drilling - Google Patents
Planetary bit assembly for balancing reactive torque of drilling equipment in well drilling Download PDFInfo
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- CN101871328B CN101871328B CN 201010189645 CN201010189645A CN101871328B CN 101871328 B CN101871328 B CN 101871328B CN 201010189645 CN201010189645 CN 201010189645 CN 201010189645 A CN201010189645 A CN 201010189645A CN 101871328 B CN101871328 B CN 101871328B
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- 238000005553 drilling Methods 0.000 title claims abstract description 47
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 210000002445 nipple Anatomy 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000000295 complement effect Effects 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 230000036346 tooth eruption Effects 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 239000003208 petroleum Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000035515 penetration Effects 0.000 description 4
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The invention discloses a planetary drill bit assembly for balancing the reaction torque of drilling equipment in drilling, which relates to the technical field of drill bit drilling related equipment in petroleum drilling. The invention realizes that the external drill bit and the internal drill bit rotate simultaneously under the drive of the same drive mechanism, and the rotation speed of the external drill bit can automatically adjust the rotation speed along with the change of the drilling speed so as to adapt to and eliminate or balance the reactive torque force generated by different drilling speeds in real time, thereby further increasing the stability and the directional control capability of the drill bit.
Description
Technical field
Drill bit creeps into the relevant device technical field when the present invention relates to oil drilling, exactly relates to a kind of reaction torque that can effectively eliminate the drilling well generation, increases the syndeton of stability of bit and directed control ability.
Background technology
Drilling bore bit unavoidably can be applied reaction torque by the stratum in the Process of Oil Well Drilling, and drilling process can not be steady fully, and high more average drilling well moment of torsion can bring big more down-hole reaction torque.Reaction torque on the one hand, can be brought harmful effect to common stability of creeping in drilling well reality; On the other hand; Need directed engineer when putting tool-face, to reserve untwist angle in the directed drilling according to regional construction experience; And the untwist angle that reserves often disagrees with actual conditions; And reaction torque also can cause tool-face frequently to depart from well design track, causes harmful effect for the directionality of directed drilling well.
Publication number is CN101525979A, and the Chinese patent document that open day is on September 9th, 2009 discloses a kind of equipment that is used to eliminate net torque of bit and control bit walk.Drilling equipment control or eliminate reaction torque from drill bit, thus prevent since drilling equipment do not expect rotation, penetrating loss; Or through desirably controlling reaction torque, the control drilling direction, thus the bit walk expected caused.This drilling equipment has the drill bit that separates with one heart, and wherein: the inner bit edge direction opposite with outside drill bit rotated simultaneously.This inner bit can be from outside drill bit shaft to travelling forward or aiming at outside drill bit movement backward.The power that is produced by inside and outside drill bit is controlled to eliminate or regulate reaction torque.
Though technique scheme has proposed a kind of concrete scheme that is used to eliminate the drill bit reaction torque: even the mode of the inner bit edge square rotation opposite with outside drill bit; But in order to realize this purpose; The concrete technical scheme that provides in this patent documentation is too complicated, though and its direction of rotation that has realized outside drill bit and inner bit opposite, all the while is connected with power unit and accomplishes outside drill bit simultaneously and inner bit is rotated in the opposite direction through the power unit driving for outside drill bit and inner bit; Like this in rotary course; Overcome the reaction torque power that drill bit produced need calculate and confirm in drilling process thereby should apply great rotary speed actually for outside drill bit, complicated operation, and the geology in the drilling process in case the stratum of boring or the rate of penetration that caused when operating change; The reaction torque power that is produced will correspondingly change; So just need recomputate and confirm the rotation rotating speed of outside drill bit, adapting to the rate of penetration after the variation, otherwise the effect that can't reach thorough elimination or regulate reaction torque; Such mode complicated operation, operating efficiency is low.
Summary of the invention
For solving the problems of the technologies described above; The present invention proposes a kind of when being applicable to the down-hole oil drilling; The drill bit drilling well produces reaction torque power during the ability balanced drilling; Increase the planetary drill bit assembly of stability of bit and directed control ability, the present invention has realized that outside drill bit and inner bit rotate through time under the same drive mechanism, and the rotary speed of outside drill bit can be regulated rotary speed automatically along with the variation of rate of penetration; With the reaction torque power that real-time adaptation and elimination or the different bit speed of balance are produced, further increased the stability and the directed control ability of drill bit.
The present invention realizes through adopting following technical proposals:
A kind of planetary drill bit assembly that is used for drilling well balanced drilling equipment reaction torque; It is characterized in that: comprise planetary structure, planetary structure comprises driving shaft, and an end of driving shaft is connected with the inner bit composite member; The other end of driving shaft is connected with the screw drive head; Middle part at driving shaft is arranged with drive shell, and the drive shell external fixation is provided with outside bit sets component, between drive shell and driving shaft, is provided with planet stent dish, planet stent and a plurality of planetary gear; Said planet stent dish and planet stent all are sheathed on the said driving shaft; Planetary gear is bearing on said planet stent dish and the planet stent, and planetary gear is through said driving shaft engaged transmission, and a plurality of planetary gear all with said drive shell through meshed transmission gear; Said driving shaft two 1 ends are connected with the screw drive head; Porose circumferentially being provided with of driving shaft; A piston and No. two pistons are packed in the circumferential hole that is provided with of said driving shaft; On a piston and No. two pistons, be respectively arranged with an O type circle and No. two O type circles, piston, No. two pistons, O type circle and No. two O type circles and driving shaft radial direction through hole constitute pressure compensator.
The outside of drive shell is drill bit outside seal nipple connects, and outer drill bit and seal nipple are integral and are placed on through being threaded on the bearing, and bearing is installed on the bearing support, and bearing support and planet stent dish are through being threaded.
Be respectively arranged with the circular hole that is complementary with the planetary gear number on said planet stent dish and the planet stent, planetary axle penetrates in the circular hole of said planet stent dish and planet stent, and planetary gear is bearing between planet stent dish and the planet stent.
Six planetary gears evenly are centered around periphery, said driving shaft middle part.
The inwall of said drive shell forms gear ring, a plurality of planetary gears and gear ring engagement fit.
Drill bit and bit adapter in said inner bit composite member comprises, interior drill bit and bit adapter are through being threaded, and bit adapter and driving shaft are through being threaded.
Said outside bit sets component comprises outer drill bit, and outer drill bit is provided with the PDC cutting teeth that is complementary with interior drill bit.
Beneficial effect of the present invention shows:
1 is that the prior art of CN101525979A patent documentation representative is compared with publication number; Because the present invention adopts an end of driving shaft to connect the inner bit composite member; Rotate through planetary gear engaged transmission drive shell; Drive shell drives outside bit sets component fixed thereon and rotates simultaneously; Such frame mode, only need one-time calculation good: the inner bit difference is crept into rotary speed, be used to eliminate with outside drill bit or the rotary speed of the following reaction torque power that produces of these different bit speed of balance between ratio; Calculated the engaged transmission coefficient (number of teeth through meshing gear realizes) between driving shaft, planetary gear and the drive shell through this ratio; Thereby the rotary speed that has realized outside drill bit can be regulated rotary speed automatically along with the variation of rate of penetration, and the reaction torque power so that real-time adaptation and elimination or the different bit speed of balance are produced has further increased the stability of drill bit and the purpose of directed control ability; Simultaneously; Piston, No. two pistons, O type circle and No. two O type circles and driving shaft radial direction through hole constitute pressure compensator; Can further eliminate or reaction torque power that the different bit speed of balance are produced; The stability and the directed control ability of drill bit have further been increased; Reaction torque through the combination of inside and outside drill bit is delivered on the driving shaft is further cancelled each other through pressure compensating system, is delivered to reaction torque on the drill string through driving shaft and is further reduced by pressure compensating system or eliminates, has increased the stable of drill bit and has increased directed control ability.
2, because planetary gear of the present invention passes through planet stent and the supporting of planet stent dish; Planetary gear compared with prior art, so just can prevent that planetary gear is moved in the axial direction between planet stent and planet stent dish; And on planet stent and planet stent dish, have circular hole; Planetary axle imports in the circular hole, and string moves so just to prevent planetary gear to take place up and down, and it is stably rotated.
3, formation rock is cancelled each other through the reaction torque that inside and outside drill bit combination is delivered on the driving shaft, and the reaction torque that is delivered on the drill string through driving shaft is reduced or eliminates, and has increased the stability of drill bit and has increased directed control ability.
Description of drawings
To combine the Figure of description and the specific embodiment that the present invention is done further detailed description below, wherein:
Fig. 1 is a structural representation of the present invention
Mark among the figure:
1, planet stent, 2, driving shaft, 3, pistons, 4, O type circles, 5, No. two pistons; 6, No. two O type circles, 7, planetary gear, 8, drive shell, 9, the planet stent dish, 10, packing ring; 11, bolt, 12, bearing support, 13, bearing, 14, the bearing locating ring, 15, seal nipple; 16, outer drill bit, 17, bit adapter, 18, the screw rod shell, 19, the screw drive head.
The specific embodiment
Embodiment 1
The invention discloses a kind of planetary drill bit assembly that is used for drilling well balanced drilling equipment reaction torque; Comprise planetary structure, planetary structure comprises driving shaft 2, and an end of driving shaft 2 is connected with the inner bit composite member; The other end of driving shaft 2 and screw drive 19 is connected; Be arranged with drive shell 8 at the middle part of driving shaft 2, drive shell 8 external fixation are provided with outside bit sets component, between drive shell 8 and driving shaft 2, are provided with planet stent dish 9, planet stent 1 and a plurality of planetary gear 7; Said planet stent dish 9 all is sheathed on the said driving shaft 2 with planet stent 1; Planetary gear 7 is bearing on said planet stent dish 9 and the planet stent 1, and planetary gear 7 is through said driving shaft 2 engaged transmission, and a plurality of planetary gear 7 all with said drive shell 8 through meshed transmission gear; Said driving shaft 2 two one ends and screw drive 19 is connected; Porose circumferentially being provided with of driving shaft 2; A piston 3 and No. two pistons 5 are packed in the said driving shaft 2 circumferential holes that are provided with; On piston 3 and No. two pistons 5, be respectively arranged with an O type circle 4 and 6, numbers pistons of No. two O type circles 3, No. two pistons 5, an O type circle 4 and No. two O type circles 6 and constitute pressure compensator with driving shaft 2 radial direction through hole.
Embodiment 2
As a preferred embodiments of the present invention; With reference to Figure of description 1; On the basis of embodiment 1, the outside of drive shell 8 of the present invention is drill bit 16 outside seal nipple 15 connects, and outer drill bit 16 is integral and is placed on the bearing 13 with seal nipple 15 through being threaded; Bearing 13 is installed on the bearing support 12, and bearing support 12 and planet stent dish 9 are through being threaded.Be respectively arranged with the circular hole that is complementary with planetary gear 7 numbers on said planet stent dish 9 and the planet stent 1; The axle of planetary gear 7 penetrates in the circular hole of said planet stent dish 9 and planet stent 1, and planetary gear 7 is bearing between planet stent dish 9 and the planet stent 1.Six planetary gears 7 evenly are centered around periphery, said driving shaft 2 middle parts.The inwall of said drive shell 8 forms gear ring, a plurality of planetary gears 7 and gear ring engagement fit.Drill bit and bit adapter 17 in said inner bit composite member comprises, interior drill bit and bit adapter 17 are through being threaded, and bit adapter 17 and driving shaft 2 are through being threaded.Said outside bit sets component comprises outer drill bit 16, and outer drill bit 16 is provided with the PDC cutting teeth that is complementary with interior drill bit.
Embodiment 3
Another embodiment of the present invention is: comprise planetary structure, pressure compensator and inside and outside drill bit, inside and outside drill bit connects through planetary structure, realizes the reaction torque balance.Said inside and outside drill bit and planetary structure comprise: bearing locating ring, driving shaft 2, piston, planetary gear 7, planet stent dish 9, planet stent 1, drive shell 8, bearing support 12, seal nipple 15, bit adapter 17, bearing 13, interior drill bit and outer drill bit 16.Interior drill bit and bit adapter 17 be through being threaded, and bit adapter 17 and driving shaft 2 be through being threaded, and driving shaft 2 is connected through screw thread and screw drive 19.Bearing locating ring seat is placed on the seal nipple 15 interior shoulders, and outer drill bit 16 is integral through being threaded with seal nipple 15 and seat is placed on the bearing 13, and bearing 13 is placed in the bearing support 12.Planet stent dish 9 and bearing support 12 are through being threaded, and planet stent dish 9 is connected through pin with planet stent 1, and planet stent 1 is connected with screw rod shell 18 through screw thread.Bearing 13 contacts with bearing locating ring, bearing support 12, planet stent dish 9 and drive shell 8 simultaneously.6 planetary gears are inlayed respectively in 6 cylindrical holes that carry out prong frame 1 and planet stent dish 9 at two about in the of 7; And be connected with driving shaft 2, drive shell 8 through gears engaged; Planet stent dish 9 carries out spacing with 1 pair of planetary gear of planet stent 7; Can prevent planetary gear 7 axial floats, make its stable rotation.
When this planetary drill bit assembly crept into, outer drill bit 16, drive shell 8 were suspended on the outer ring of bearing 13, and downward suspended weights acts on the bearing support 12 and is delivered to planet stent 1; When normally creeping into, outer drill bit 16 receives strata pressure and forms bearing 13 outer rings are upwarded pressure, and passes to bearing support 12 by bearing 13, is finally born by planet stent 1; When drawing on during trip-out, upper pulling force passes to bearing support 12 by planet stent 1 and remakes and use on drive shell 8 and the outer drill bit 16.Bearing 13 can not only transmit pulling force, pressure; Rotary course that can also smooth drive housing 8: because the gear movement of planetary structure unavoidably has displacement and vibrations; Radial displacement when bearing 13 can limit drive shell 8 rotations; Reach the purpose of eliminating vibrations, strengthen drive shell 8 rotational stabilizations.Planet stent 1 upper shoulder can be spacing to carrying out through the outer drill bit that is threaded 16 and drive shell 8, prevents to move on it.Driving shaft 2 is metallic seal with seal nipple 15 places and planet stent 1 with drive shell 8 places, and it is inner to prevent that drilling fluid from getting into planetary drill bit assembly.Piston is placed in the hole of driving shaft 2 circumferential arrangement, and O type circle is housed on the piston, with the radial direction through hole formation pressure compensator on the driving shaft 2.
This planetary drill bit assembly is when normally creeping into, and screw drive 19 a driving driving shaft 2 turn clockwise, and turn clockwise through the bit adapter 17 that is threaded with driving shaft 2, turn clockwise simultaneously through the interior drill bit that is threaded with bit adapter 17.Driving shaft 2; Planetary gear 7, planet stent dish 9, planet stent 1 and drive shell 8 are formed a planetary structure; Planet stent 1 through bolt 11 connects is fixed with planet stent dish 9; According to the transmission principle of planetary structure, the driving shaft 2 that turns clockwise drives planetary gear 7 and when driving shaft 2 revolves round the sun clockwise, carries out counterclockwise rotation, finally drives drive shell 8 and is rotated counterclockwise.Being rotated counterclockwise of drive shell 8 driven outer drill bit 16 and be rotated counterclockwise, and be opposite with interior drill bit direction of rotation.Said outside bit sets component comprises outer drill bit 16, and outer drill bit 16 is provided with the PDC cutting teeth that is complementary with interior drill bit.
Embodiment 4
The invention discloses a kind of planetary drill bit assembly that is used for drilling well balanced drilling equipment reaction torque: form by planet stent 1, driving shaft 2, piston 3, O type circle 4, No. two pistons 5, No. two O type circles, planetary gear 7, drive shell 8, planet stent dish 9, packing ring 10, bolt 11, bearing support 12, bearing 13, bearing locating ring 14, seal nipple 15, outer drill bit 16, bit adapters 17.Planet stent 1 and screw rod shell 18 are through being threaded; Driving shaft 2 and screw drive 19 is through being threaded; O type circle 4 and No. two O type circles 6 are contained in respectively on piston 3 and No. two pistons 5; Piston 2 and piston 5 are packed in the hole of driving shaft 2 circumferential arrangement, constitute pressure compensating system with driving shaft 2 radial direction through hole.6 planetary gear 7 two ends are respectively charged in 6 cylindrical holes of planet stent 1 and planet stent dish 9; And be connected with driving shaft 2, drive shell 8 through gears engaged; Planet stent dish 9 is connected with bolt 11 through packing ring 10 with planet stent 1; And planetary gear 7 is carried out spacing, and can prevent planetary gear 7 axial floats, make its stable rotation.Bearing 13 is placed in the bearing support 12, and 14 of bearing locating rings are placed on the seal nipple 15 interior shoulders, and 13 on bearing is placed on the bearing locating ring 14, and seal nipple 15 is integral through being threaded with drive shell 8 and seat is placed on the bearing 13.Planet stent dish 9 and bearing support 6 are through being threaded.Bearing 13 contacts with bearing locating ring 14, bearing support 12, planet stent dish 9 and drive shell 8 simultaneously.
When normally creeping into, driving shaft 2 turns clockwise, and turns clockwise simultaneously through the bit adapter 17 that is threaded with driving shaft 2; In like manner, turn clockwise through the interior drill bit that is threaded with bit adapter 17.Planet stent 1, driving shaft 2, planetary gear 7, drive shell 8 and planet stent dish 9 are formed a planetary structure; Planet stent dish 9 is fixed with planet stent 1; Transmission principle according to planetary structure; The driving shaft 2 that turns clockwise drives planetary gear 7 and carries out counterclockwise rotation; The final drive shell 8 that drives is rotated counterclockwise, and the drive that is rotated counterclockwise of drive shell 8 is rotated counterclockwise through the seal nipple 15 that is threaded, and seal nipple 15 drives outer drill bit 16 and is rotated counterclockwise.Said outside bit sets component comprises seal nipple 15 and outer drill bit 17, and outer drill bit is provided with the PDC cutting teeth that is complementary with interior drill bit.
Claims (6)
1. planetary drill bit assembly that is used for drilling well balanced drilling equipment reaction torque; It is characterized in that: comprise planetary structure, planetary structure comprises driving shaft, and an end of driving shaft is connected with the inner bit composite member; The other end of driving shaft is connected with the screw drive head; Middle part at driving shaft is arranged with drive shell, and the drive shell external fixation is provided with outside bit sets component, between drive shell and driving shaft, is provided with planet stent dish, planet stent and a plurality of planetary gear; Said planet stent dish and planet stent all are sheathed on the said driving shaft; Planetary gear is bearing on said planet stent dish and the planet stent, and planetary gear is through said driving shaft engaged transmission, and a plurality of planetary gear all with said drive shell through meshed transmission gear; Porose circumferentially being provided with of driving shaft; A piston and No. two pistons are packed in the circumferential hole that is provided with of said driving shaft; On a piston and No. two pistons, be respectively arranged with an O type circle and No. two O type circles, piston, No. two pistons, O type circle and No. two O type circles and driving shaft radial direction through hole constitute pressure compensator.
2. according to the said planetary drill bit assembly that is used for drilling well balanced drilling equipment reaction torque of claim 1; It is characterized in that: the outside of drive shell is drill bit outside seal nipple connects; Outer drill bit and seal nipple are integral and are placed on the bearing through being threaded; Bearing is installed on the bearing support, and bearing support and planet stent dish are through being threaded.
3. according to claim 1 or the 2 said planetary drill bit assemblies that are used for drilling well balanced drilling equipment reaction torque; It is characterized in that: be respectively arranged with the circular hole that is complementary with the planetary gear number on said planet stent dish and the planet stent; Planetary axle penetrates in the circular hole of said planet stent dish and planet stent, and planetary gear is bearing between planet stent dish and the planet stent.
4. according to the said planetary drill bit assembly that is used for drilling well balanced drilling equipment reaction torque of claim 1, it is characterized in that: the inwall of said drive shell forms gear ring, a plurality of planetary gears and gear ring engagement fit.
5. according to the said planetary drill bit assembly that is used for drilling well balanced drilling equipment reaction torque of claim 1; It is characterized in that: drill bit and bit adapter in said inner bit composite member comprises; Interior drill bit and bit adapter are through being threaded, and bit adapter and driving shaft are through being threaded.
6. according to the said planetary drill bit assembly that is used for drilling well balanced drilling equipment reaction torque of claim 1, it is characterized in that: said outside bit sets component comprises outer drill bit, and outer drill bit is provided with the PDC cutting teeth that is complementary with interior drill bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010189645 CN101871328B (en) | 2010-05-24 | 2010-05-24 | Planetary bit assembly for balancing reactive torque of drilling equipment in well drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010189645 CN101871328B (en) | 2010-05-24 | 2010-05-24 | Planetary bit assembly for balancing reactive torque of drilling equipment in well drilling |
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| Publication Number | Publication Date |
|---|---|
| CN101871328A CN101871328A (en) | 2010-10-27 |
| CN101871328B true CN101871328B (en) | 2012-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010189645 Active CN101871328B (en) | 2010-05-24 | 2010-05-24 | Planetary bit assembly for balancing reactive torque of drilling equipment in well drilling |
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| CN109750977A (en) * | 2017-11-01 | 2019-05-14 | 陈晓新 | A kind of New well drilling torque increase square, which disappears, to quiver except vibratory tool |
| CN107795273B (en) * | 2017-11-21 | 2023-09-22 | 吉林大学 | Double-drill torque self-balancing pressure adjusting device |
| CN111188575B (en) * | 2020-01-15 | 2021-06-04 | 大庆明悦石油科技有限公司 | Rotary steering drilling device |
| CN114412357B (en) * | 2022-01-25 | 2024-09-06 | 陕西太合智能钻探有限公司 | Drilling device |
| CN118148487B (en) * | 2024-05-08 | 2024-07-30 | 奥瑞拓能源科技股份有限公司 | Underground double-power drilling tool |
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|---|---|---|---|---|
| US4222445A (en) * | 1979-01-08 | 1980-09-16 | Vadetsky Jury V | Reduction unit of drilling motor |
| CN2092597U (en) * | 1991-05-29 | 1992-01-08 | 石油勘探开发科学研究院机械所 | Twisting moment joints of obverse and reverse directions |
| CN2179453Y (en) * | 1993-09-19 | 1994-10-12 | 郭允庄 | Vibrating hammer with hidden holes |
| CN2406055Y (en) * | 2000-01-20 | 2000-11-15 | 辽河石油勘探局钻井二公司 | Back-torque joint |
| CN101525979A (en) * | 2008-03-05 | 2009-09-09 | 普拉德研究及开发股份有限公司 | Device for eliminating net torque of bit and controlling bit walk |
-
2010
- 2010-05-24 CN CN 201010189645 patent/CN101871328B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4222445A (en) * | 1979-01-08 | 1980-09-16 | Vadetsky Jury V | Reduction unit of drilling motor |
| CN2092597U (en) * | 1991-05-29 | 1992-01-08 | 石油勘探开发科学研究院机械所 | Twisting moment joints of obverse and reverse directions |
| CN2179453Y (en) * | 1993-09-19 | 1994-10-12 | 郭允庄 | Vibrating hammer with hidden holes |
| CN2406055Y (en) * | 2000-01-20 | 2000-11-15 | 辽河石油勘探局钻井二公司 | Back-torque joint |
| CN101525979A (en) * | 2008-03-05 | 2009-09-09 | 普拉德研究及开发股份有限公司 | Device for eliminating net torque of bit and controlling bit walk |
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| CN101871328A (en) | 2010-10-27 |
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