CN203201467U - Steering tool for jet drilling radial well through hydraulic-controlled hollow spherical joint connection - Google Patents
Steering tool for jet drilling radial well through hydraulic-controlled hollow spherical joint connection Download PDFInfo
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- CN203201467U CN203201467U CN 201320120962 CN201320120962U CN203201467U CN 203201467 U CN203201467 U CN 203201467U CN 201320120962 CN201320120962 CN 201320120962 CN 201320120962 U CN201320120962 U CN 201320120962U CN 203201467 U CN203201467 U CN 203201467U
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- 238000005553 drilling Methods 0.000 title claims abstract description 9
- 239000003245 coal Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 5
- 238000001802 infusion Methods 0.000 claims description 5
- 230000033001 locomotion Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 2
- 239000011148 porous material Substances 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000011109 contamination Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model relates to the field of coalbed methane exploitation, in particular to a downhole orientation and radial steering tool for jet drilling a radial horizontal well. The steering tool is transported to a coal bed pore-broadening well section of a vertical well through an oil pipe; the oil pipe is rotated on the ground to realize the orientation; clear water is continuously injected through pumping on the ground for pressure boost to make a hollow spherical joint connector set be bent and enter a coal bed in an ejecting and deflecting mode, wherein the hollow spherical joint connector set is controlled by a water power hydraulic cylinder; coiled tubing or a flexible high-pressure tube can pass through the coal bed to realize radial steering jet drilling of a horizontal pore in the coal bed; the steering tool for jet drilling the radial well through hydraulic-controlled hollow spherical joint connection also can be used for tripping in a high-strength kerf PVC diversion supporting tube.
Description
The utility model relates to a kind of for the coal-bed gas exploitation field, be specifically related to a kind of injection and creep into downhole orientation and the radially-directed instrument of radially horizontal well, this instrument by tubing transmission to peupendicular hole coal seam reaming well section, the ground rotation pipeline is realized directed, continue the supercharging of infusion clear water by ground, make one group of crooked jet deflection of the hollow sphere joint connector by the control of Waterpower hydraulic pressure cylinder enter the coal seam, and coiled tubing or flexible high pressure pipe are passed through, realize that the radially-directed jet drilling advances lateral aperture in the coal seam, and can connect to spray by a kind of hydraulic control hollow sphere joint that this instrument is lowered to high strength slot PVC water conservancy diversion stay pipe and creep into the radial well steering tool.
Background technology
In conventional gas and oil and CBM exploration and development field, present main employing bit mode creeps into peupendicular hole and horizontal well comes development of fields and coal bed gas field, the minority well is by being lowered to whipstock, adopts flexible drill string to creep into or the tentative exploitation oil gas of radial hole and coal bed gas are crept in jetting at sleeve pipe uplifting window deflecting.It is to be lowered to the wide-angle whipstock in sleeve pipe inwardopening window position that the casing sidetracking deflecting creeps into radial hole, windows with the drill bit of the windowing position of sailing first, then is lowered to flexible drill string rotation deflecting and creeps into the radial level hole.Jetting creep into radial hole be both be lowered to whipstock equally with casing sidetracking drill through sleeve pipe windowed after, be lowered to flexible hydraulic and spray boring means and spray and creep into radial hole.It is to be lowered to the radially-directed instrument with oil pipe in cased well that radial hole is crept in another kind of injection, by oil pipe and radially-directed instrument, be the coiled tubing of 25mm with diameter, be lowered to the flexible rotating window opening tool behind the sleeve pipe uplifting window, be that the diameter that the coiled tubing of 25mm is lowered to nozzle is 25mm flexible high pressure pipe with diameter again, pump into High-Pressure Water by ground and realize spraying and creep into radial hole.Front two kinds of radial well boring means are to realize that by whipstock and flexible drill string acting in conjunction kick-off and radial level hole drill advance, and these tool operations are simple, use reliably, and institute's eye diameter that creeps into are larger.But, whipstock orientation, location, commutation, transposition and salvaging etc. all need lower tubular column to realize, equally, the replacing drill bit that also needs after windowing to make a trip creeps into, and frequently plays lower tubular column, and is both time-consuming, take again artificial, more waste money, when creeping into the coal seam especially for a long time, easily collapse and bury the card instrument in the coal seam.Latter's steering tool deft design is realized 90 ° of radially-directeds in can be in the cased well extremely limited space.But, this instrument is realized spraying operation high-voltage tube 90-degree bent and can be passed through smoothly its labyrinth in the extremely limited space in cased well, the working pipe that has limited than Large Diameter Pipeline passes through, cause working string (25mm) diameter less, the injection discharge capacity is too small, and earth cuttings can not in time be returned and be discharged to ground, causes contamination and plugging stratum (superpressure is sprayed and crept into).Simultaneously, because tool bore is less, causing the radial hole diameter less, can not be lowered to the water conservancy diversion stay pipe in radial hole, collapses and easily stops up radial hole in the stratum.Especially relatively poor, the coal seam of easily collapsing of permeability, contamination and plugging is even more serious.
The utility model content:
To decide kick-off and frequently play lower tubular column and cause operation both to be lost time in order to overcome, labor is taken manually again, more expend wealth, when creeping into the coal seam especially for a long time, easily collapse and bury the card instrument in the coal seam; In order to overcome slim-hole steering tool complex structure, high-pressure injection working pipe (25mm) diameter is less, and operation pressure is excessive, and the injection discharge capacity is too small, and earth cuttings can not in time be returned and be discharged to ground, easily causes polluting the shortcomings such as reservoir; Also less in order to overcome this orientation steering tool internal diameter, the radial hole diameter that sprays is less, can not be lowered to the shortcomings such as water conservancy diversion stay pipe in radial hole, it is a kind of for the coal-bed gas exploitation field that the utility model provides, and a kind of hydraulic control hollow sphere joint connects to spray creeps into the radial well steering tool.This instrument by tubing transmission to peupendicular hole coal seam reaming well section, the ground rotation pipeline is realized directed, continue infusion clear water and supercharging by ground, make one group of crooked jet deflection of hollow sphere joint connector that is promoted by the Waterpower hydraulic pressure cylinder enter the coal seam, and coiled tubing or flexible high pressure pipe are passed through, realize that the radially-directed jet drilling advances lateral aperture in the coal seam, and can connect to spray by a kind of hydraulic control hollow sphere joint that this instrument is lowered to high-intensity PVC water conservancy diversion stay pipe and creep into the radial well steering tool.
In order to realize above-mentioned purpose, the utility model by the following technical solutions:
A kind of hollow sphere joint by Waterpower hydraulic pressure cylinder control (hydraulic control) connects the directed steering tool of radial well jet drilling, it is characterized in that being comprised of connector unit, one group of band Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit and the ejecting gun unit of can giving up.Upper binding head unit upper end is by screw thread and 3 1/2 " oil pipe column is connected, and the lower end is connected with the ejecting gun assembly of can giving up by the hollow ball body.
The utility model is with 3 1/2 " oil pipe is transferred to peupendicular hole reaming (diameter 500mm) coal seam well section as work string; realize directed and promote the annular piston in the hydraulic cylinder and the wedge key motion that is attached thereto makes the instrument bend in one direction by the pressurization of ground infusion clear water by ground rotary work tubing string, and spray to enter the coal seam and then realize that the radial well horizontally-guided sprays and creep into.
In specific embodiment of the utility model:
Described a kind of hydraulic control hollow sphere joint connects to spray creeps into the radial well steering tool, this instrument by tubing transmission to peupendicular hole coal seam reaming (diameter 500mm) well section, the ground rotation pipeline is realized directed, continue the supercharging of infusion clear water by ground, make one group of crooked jet deflection of the hollow sphere joint connector by the control of Waterpower hydraulic pressure cylinder enter the coal seam, and coiled tubing or flexible high pressure pipe are passed through, realize that the radially-directed jet drilling advances lateral aperture in the coal seam, and can connect to spray by a kind of hydraulic control hollow sphere joint that this instrument is lowered to high strength slot PVC water conservancy diversion stay pipe and creep into the radial well steering tool.
Described connector unit mainly is comprised of joint and hollow sphere, and the upper end is by screw thread and 3 1/2 " oil pipe is connected, and the lower end is by the ball-and-socket of hollow sphere and Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit
Connect.
Described Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit is mainly by cylinder body (cylinder body end and half ball-and-socket end), the cylinder body lid, annular piston, spring, the piston rod cavity, wedge key, the wedge key spacer pin, piston packing, piston rod inlet opening and relief hole, sealing rings on hollow piston rod and the hollow ball body etc. consist of Waterpower hydraulic pressure cylinder assembly, Waterpower hydraulic pressure cylinder assembly promotes annular piston and wedge key and moves and insert in the wedge shape keyway along hollow piston rod under the effect of hydraulic pressure, make hollow sphere joint connector crooked, when pressure was lower than elastic force to spring, the spring acting in opposition promotes annular piston to be made wedge key break away from keyway and makes piston rod hollow sphere joint connector recover the straight line form along the hollow piston rod counter motion.Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit ball-and-socket end is connected to form the ball-and-socket body by screw thread and ball-and-socket lid, and the spherical key on it plays a part spacing and the location, makes the instrument bend in one direction and keeps case of bending.The wedge-shaped slot that ball-and-socket covers and the wedge key mating reaction on the annular piston prize hollow sphere joint connector crooked.
Described hydraulic control hollow sphere joint linkage unit body is to be formed by connecting by the ball-and-socket on it and hollow ball body by two hydraulic control hollow sphere joint linkage units, when annular piston and wedge key move when descending, wedge key prizes the crooked certain angle of another hydraulic control hollow sphere joint linkage unit.Several hydraulic control hollow sphere joint linkage units interconnect, and are common crooked under the effect of hydraulic pressure, and then realize radial well steering tool curved guide.
The hollow sphere joint connector of described Waterpower hydraulic pressure cylinder control is to be formed by connecting by several unit, Waterpower hydraulic pressure cylinder hollow ball body joint, the connector upper end, hollow sphere joint of Waterpower hydraulic pressure cylinder control is connected with hollow ball body 1 on the upper binding head unit by ball-and-socket, the connector lower end is connected with ball-and-socket on the ejecting gun unit of can giving up by the hollow ball body, and the impetus by Waterpower hydraulic pressure cylinder assembly makes tool flexion become 90 ° or recover linear state.
The described ejecting gun unit of giving up mainly is made of ball-and-socket lid, injection cavity, the injector assembly of can giving up (fluid cavity, nozzle, sealing ring) and spherical key.Upper end, ejecting gun unit is connected with the hollow ball body of connector lower end, Waterpower hydraulic pressure cylinder hollow ball body joint by the ball-and-socket body.The injector assembly fluid cavity tool eddy current form of can giving up makes current eject ringwise cut state from Nozzle, can cut out the eyelet of rule in the coal seam.Spherical key on the ball-and-socket body and the bead nest on the injector assembly form the structure of giving up, realize that under the effect of the pressure of giving up injector assembly breaks away from directed steering tool, and then realize high-pressure injection pipe and stay pipe passed through by, and can many radial level holes of continuous injection by the function of giving up.
Description of drawings
Fig. 1 is the existing down-hole of the utility model worker's view;
Fig. 2 the utility model hydraulic control hollow sphere joint linkage unit structural representation;
Fig. 3 is the utility model linkage unit structural representation;
Fig. 4 is that the utility model can be given up to spray and robbed the block construction schematic diagram;
Fig. 5 is utility model hydraulic control hollow sphere joint linkage unit body running schematic diagram;
The specific embodiment
As shown in Figure 1, the hollow sphere joint connector of described Waterpower hydraulic pressure cylinder control is to be formed by connecting by several unit, Waterpower hydraulic pressure cylinder hollow ball body joint 20, the connector upper end, hollow sphere joint of Waterpower hydraulic pressure cylinder control is connected with hollow ball body 1 on the upper binding head unit 27 by ball-and-socket 2, the connector lower end is connected with ball-and-socket 2 on the ejecting gun unit 28 of can giving up by hollow ball body 1, and the impetus by Waterpower hydraulic pressure cylinder assembly makes tool flexion become 90 ° or recover linear state.
As shown in Figure 2, described Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit 20 is mainly by cylinder body 3 (cylinder body end and half ball-and-socket end), cylinder body lid 8, annular piston 5, spring 9, piston rod cavity 15, wedge key 12, wedge key spacer pin 10, piston packing 18, piston rod inlet opening 14 and relief hole 13, sealing rings 17 on hollow piston rod 7 and the hollow ball body 1 etc. consist of Waterpower hydraulic pressure cylinder assembly, Waterpower hydraulic pressure cylinder assembly promotes annular piston 5 and wedge key 6 and moves and insert in the wedge shape keyway 12 along hollow piston rod 7 under the effect of hydraulic pressure, make hollow sphere joint connector crooked, when pressure was lower than the elastic force of spring 9, spring 9 acting in oppositions promote annular piston 5 to be made wedge key 6 disengaging keyways 12 and makes piston rod 15 hollow sphere joint connectors recover the straight line forms along the hollow piston rod counter motion.Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit 20 ball-and-socket ends are connected to form ball-and-socket body 2 by screw thread and ball-and-socket lid 4, and the spherical key 16 on it plays a part spacing and the location, makes the instrument bend in one direction and keeps case of bending.Wedge-shaped slot 12 on the ball-and-socket lid 4 and wedge key 6 mating reactions on the annular piston 5 prize hollow sphere joint connector crooked.
As shown in Figure 5, described hydraulic control hollow sphere joint linkage unit body is to be formed by connecting by the ball-and-socket 2 on it and hollow ball body 1 by two hydraulic control hollow sphere joint linkage units 20, when 6 motions of annular piston 5 and wedge key were descending, wedge key 6 prized another hydraulic control hollow sphere joint linkage unit 20 crooked certain angles.Several hydraulic control hollow sphere joint linkage units 20 interconnect, and are common crooked under the effect of hydraulic pressure, and then realize radial well steering tool curved guide.
As shown in Figure 3, described connector unit 27 mainly is comprised of threaded joint 21 and hollow sphere 1, and the upper end is by screw thread 21 and 3 1/2 " oil pipe is connected, and the lower end is passed through hollow sphere 1 and is connected with the ball-and-socket 2 of Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit 20.
As shown in Figure 4, the described ejecting gun unit 28 of giving up mainly is made of ball-and-socket lid 4, injection cavity 22, the injector assembly 23 of can giving up (fluid cavity 29, nozzle 24, sealing ring 25) and spherical key 26.28 upper ends, ejecting gun unit are connected with the hollow ball body 1 of connector lower end, Waterpower hydraulic pressure cylinder hollow ball body joint by ball-and-socket body 2.The injector assembly 23 fluid cavitys 29 tool eddy current forms of can giving up make current eject ringwise cut state from Nozzle, can cut out the eyelet of rule in the coal seam.Spherical key 26 on the ball-and-socket body 2 and the bead nest on the injector assembly 23 form the structure of giving up, realize that under the effect of the pressure of giving up injector assembly 23 breaks away from directed steering tool, and then realize high-pressure injection pipe and stay pipe passed through by, and can many radial level holes of continuous injection by the function of giving up.
Claims (4)
1. described hydraulic control hollow sphere joint connection is sprayed and is crept into the radial well steering tool, it is characterized in that: by tubing transmission to peupendicular hole coal seam reaming well section, the ground rotation pipeline is realized directed, continue the supercharging of infusion clear water by ground, make one group of crooked jet deflection of the hollow sphere joint connector by the control of Waterpower hydraulic pressure cylinder enter the coal seam, and coiled tubing or flexible high pressure pipe are passed through, realize that the radially-directed jet drilling advances lateral aperture in the coal seam, and can connect to spray by a kind of hydraulic control hollow sphere joint that this instrument is lowered to high strength slot PVC water conservancy diversion stay pipe and creep into the radial well steering tool.
2. the radial well steering tool is crept in described hydraulic control hollow sphere joint connection injection according to claim 1, it is characterized in that: the connector unit, mainly formed by joint and hollow sphere, the upper end is by screw thread and 3 1/2 " oil pipe is connected, and the lower end is connected by the ball-and-socket of hollow sphere with Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit.
3. the radial well steering tool is crept in described hydraulic control hollow sphere joint connection injection according to claim 1, it is characterized in that: Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit is mainly by cylinder body, the cylinder body lid, annular piston, spring, the piston rod cavity, wedge key, the wedge key spacer pin, piston packing, piston rod inlet opening and relief hole, sealing rings on hollow piston rod and the hollow ball body etc. consist of Waterpower hydraulic pressure cylinder assembly, Waterpower hydraulic pressure cylinder assembly promotes annular piston and wedge key and moves and insert in the wedge shape keyway along hollow piston rod under the effect of hydraulic pressure, make hollow sphere joint connector crooked, when pressure is lower than elastic force to spring, the spring acting in opposition promotes annular piston to be made wedge key disengaging keyway and makes piston rod hollow sphere joint connector recover the straight line form along the hollow piston rod counter motion, Waterpower hydraulic pressure cylinder hollow sphere joint linkage unit ball-and-socket end is connected to form the ball-and-socket body by screw thread and ball-and-socket lid, spherical key on it plays a part spacing and the location, make the instrument bend in one direction and keep case of bending, the wedge-shaped slot that ball-and-socket covers and the wedge key mating reaction on the annular piston prize hollow sphere joint connector crooked.
4. the radial well steering tool is crept in described hydraulic control hollow sphere joint connection injection according to claim 1, it is characterized in that: the ejecting gun unit of can giving up is mainly covered by ball-and-socket, spray cavity, can give up injector assembly and spherical key consists of, upper end, ejecting gun unit is connected with the hollow ball body of connector lower end, Waterpower hydraulic pressure cylinder hollow ball body joint by the ball-and-socket body, the injector assembly fluid cavity tool eddy current form of can giving up, make current eject ringwise cut state from Nozzle, can in the coal seam, cut out regular eyelet, spherical key on the ball-and-socket body and the bead nest on the injector assembly form the structure of giving up, realize that under the effect of the pressure of giving up injector assembly breaks away from directed steering tool, and then realize high-pressure injection pipe and stay pipe passed through by, and can many radial level holes of continuous injection by the function of giving up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320120962 CN203201467U (en) | 2013-03-18 | 2013-03-18 | Steering tool for jet drilling radial well through hydraulic-controlled hollow spherical joint connection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320120962 CN203201467U (en) | 2013-03-18 | 2013-03-18 | Steering tool for jet drilling radial well through hydraulic-controlled hollow spherical joint connection |
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| CN203201467U true CN203201467U (en) | 2013-09-18 |
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| CN 201320120962 Expired - Fee Related CN203201467U (en) | 2013-03-18 | 2013-03-18 | Steering tool for jet drilling radial well through hydraulic-controlled hollow spherical joint connection |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806332A (en) * | 2017-12-07 | 2018-03-16 | 中国石油大学(华东) | A kind of flexible ultra-short radius boring bar tool |
| CN109083594A (en) * | 2018-08-17 | 2018-12-25 | 中煤科工集团重庆研究院有限公司 | Coal seam hydraulic direction adjustable drilling device |
| CN110552663A (en) * | 2019-09-24 | 2019-12-10 | 中国石油集团渤海钻探工程有限公司 | Flexible rotary jet cleaning tool |
| CN112031653A (en) * | 2019-06-06 | 2020-12-04 | 万晓跃 | Easily-deflecting hybrid rotary steering drilling system |
| CN113137178A (en) * | 2021-05-19 | 2021-07-20 | 中石化江钻石油机械有限公司 | Drill bit type intelligent guiding drilling device |
| CN113216868A (en) * | 2021-05-11 | 2021-08-06 | 中煤科工集团西安研究院有限公司 | One-way bending drilling tool and punching, cave-making and coal-drawing method |
| CN114135227A (en) * | 2020-09-04 | 2022-03-04 | 万晓跃 | High-stability short-radius deflecting drilling tool |
| CN114278292A (en) * | 2021-12-28 | 2022-04-05 | 西安交通大学 | Shock wave generating device with steering function and using method thereof |
| CN114427346A (en) * | 2020-09-23 | 2022-05-03 | 中国石油化工股份有限公司 | Radial hydraulic drilling steering gear |
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2013
- 2013-03-18 CN CN 201320120962 patent/CN203201467U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806332A (en) * | 2017-12-07 | 2018-03-16 | 中国石油大学(华东) | A kind of flexible ultra-short radius boring bar tool |
| CN109083594A (en) * | 2018-08-17 | 2018-12-25 | 中煤科工集团重庆研究院有限公司 | Coal seam hydraulic direction adjustable drilling device |
| CN114320157A (en) * | 2019-06-06 | 2022-04-12 | 万晓跃 | An easy-to-build hybrid rotary steerable drilling system |
| CN112031653A (en) * | 2019-06-06 | 2020-12-04 | 万晓跃 | Easily-deflecting hybrid rotary steering drilling system |
| US12025005B2 (en) | 2019-06-06 | 2024-07-02 | Xiaoyue Wan | Easy building-up hybrid rotary steerable drilling system |
| CN114704204A (en) * | 2019-06-06 | 2022-07-05 | 万晓跃 | Easily-deflecting hybrid rotary steering drilling system |
| CN110552663A (en) * | 2019-09-24 | 2019-12-10 | 中国石油集团渤海钻探工程有限公司 | Flexible rotary jet cleaning tool |
| CN114135227A (en) * | 2020-09-04 | 2022-03-04 | 万晓跃 | High-stability short-radius deflecting drilling tool |
| CN114135227B (en) * | 2020-09-04 | 2023-08-08 | 万晓跃 | A high-stability short-radius deflection drilling tool |
| CN114427346A (en) * | 2020-09-23 | 2022-05-03 | 中国石油化工股份有限公司 | Radial hydraulic drilling steering gear |
| CN113216868B (en) * | 2021-05-11 | 2022-06-24 | 中煤科工集团西安研究院有限公司 | One-way bending drilling tool and punching, cave-making and coal-drawing method |
| CN113216868A (en) * | 2021-05-11 | 2021-08-06 | 中煤科工集团西安研究院有限公司 | One-way bending drilling tool and punching, cave-making and coal-drawing method |
| CN113137178A (en) * | 2021-05-19 | 2021-07-20 | 中石化江钻石油机械有限公司 | Drill bit type intelligent guiding drilling device |
| CN114278292A (en) * | 2021-12-28 | 2022-04-05 | 西安交通大学 | Shock wave generating device with steering function and using method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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