CN113846986B - Jar while drilling - Google Patents
Jar while drilling Download PDFInfo
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- CN113846986B CN113846986B CN202111457330.XA CN202111457330A CN113846986B CN 113846986 B CN113846986 B CN 113846986B CN 202111457330 A CN202111457330 A CN 202111457330A CN 113846986 B CN113846986 B CN 113846986B
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- jar
- oil cylinder
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- teeth
- piston
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- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 230000035939 shock Effects 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 2
- 239000002689 soil Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 38
- 230000008901 benefit Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/107—Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars
- E21B31/113—Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars hydraulically-operated
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (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 application provides a jar bores with boring belongs to soil layer or rock and creeps into the field, includes: the device comprises a transmission shaft, a transmission sleeve, a jarring oil cylinder, a high-pressure oil cylinder, an auxiliary oil cylinder, a jarring shaft and a piston. The upper end of the shock shaft is connected with the lower end of the transmission shaft, the transmission sleeve is sequentially connected with the shock oil cylinder, the high-pressure oil cylinder and the auxiliary oil cylinder through threads, the piston is sleeved on the lower section of the shock shaft in a sliding mode, and the piston is arranged in the auxiliary oil cylinder in a sliding mode. The upper end face of the piston is provided with end face teeth a, and the lower end face of the piston is provided with end face teeth b. The top surface of the inner hole of the auxiliary oil cylinder is provided with end surface teeth c, and the end surface teeth c are matched with the end surface teeth a for use. The jarring axle is equipped with spacing dish, and threaded connection is used with the jarring axle to spacing dish, and the spiral of screw thread is to the direction of rotation opposite with the drilling rod, and the top surface design of spacing dish has terminal surface tooth d, and terminal surface tooth d uses with the cooperation of terminal surface tooth b. The drill rod can be quickly pulled out under the condition that the drill rod or the jar is broken when the drill is stuck, so that the maintenance time is shortened, and the economic loss is reduced.
Description
Technical Field
The invention belongs to the technical field of soil layer or rock drilling equipment, and particularly relates to a jar while drilling.
Background
In the drilling operation, due to the reasons of well wall collapse, stratum flowing and extrusion in open holes, mud wrapping of a drill bit, overlong pump stopping time and the like, the drilling accident frequently occurs, and the drilling work is stopped. The drilling jar is one of effective tools for releasing stuck drill, and has been used in the drilling field for many years, when the stuck drill is met, the drilling jar applies strong earthquake impact force to the stuck point to loosen the stuck point, thereby achieving the purpose of contacting the stuck drill.
The common drilling jar mainly comprises a transmission shaft, a transmission sleeve, a jar cylinder, an auxiliary cylinder, a high-pressure cylinder, a jar shaft, a piston and other main parts. The transmission shaft and the transmission sleeve are in sliding fit through splines, simultaneously transmit torque and adapt to the axial position generated by the jarring shaft during jarring, the lower section of the transmission sleeve is connected with the jarring oil cylinder through threads, and the jarring oil cylinder is connected with the high-pressure oil cylinder and the high-pressure oil cylinder is connected with the auxiliary oil cylinder through threads.
Because the degree of depth of well drilling all has several kilometers usually deeply, consequently the length of drilling rod also reaches several kilometers 'length, and the drilling rod is tubular structure, and adopts threaded connection between the adjacent drilling rod, looks at the structure of the similar long rope of several kilometers' drilling rod on the whole, has very big disturbance degree and tensile deformation. If the drill pipe is stuck and the operation is not proper, the threaded connection of the drill pipe is easy to break.
More seriously, once the threaded connection part of the jar is broken, the jar cannot continue to jar, and the dilemma of blocking the drill cannot be relieved, so that the drilling equipment cannot continue to work, and the drill rod cannot be smoothly pulled out, thereby seriously affecting the maintenance precision progress of the equipment.
The well drilling work is usually not interrupted for 24 hours a day, and according to the current market conditions, statistics and calculation, the well drilling work can cause about 6 thousand yuan of economic loss every 1 hour of delay, and the daily economic loss is up to 15 ten thousand. Once such an accident occurs, it takes at least several days to resolve, which results in serious economic loss.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the jar while drilling, which can smoothly pull out parts of the drill rod and the jar under the condition that the threaded connection part of the drill rod or the jar is broken when the drill is clamped, can effectively shorten the maintenance time, reduces the economic loss and has greater economic benefit.
In order to realize the purpose of the invention, the following scheme is adopted:
a drill jar, comprising: the device comprises a transmission shaft, a transmission sleeve, a jarring oil cylinder, a high-pressure oil cylinder, an auxiliary oil cylinder, a jarring shaft and a piston.
The external splines of the transmission shaft are matched with the internal splines of the transmission sleeve, the upper end of the shock shaft is connected with the lower end of the transmission shaft, the transmission sleeve is sequentially connected with the shock oil cylinder, the high-pressure oil cylinder and the auxiliary oil cylinder through threads, the piston is sleeved on the lower section of the shock shaft in a sliding mode, and the piston is arranged in the auxiliary oil cylinder in a sliding mode.
The upper end face of the piston is provided with end face teeth a, and the lower end face of the piston is provided with end face teeth b.
The top surface of the inner hole of the auxiliary oil cylinder is provided with end surface teeth c, and the end surface teeth c are matched with the end surface teeth a for use.
The jarring axle is equipped with spacing dish, and threaded connection is used with the jarring axle to spacing dish, and the spiral of screw thread is to the direction of rotation opposite with the drilling rod, and the top surface design of spacing dish has terminal surface tooth d, and terminal surface tooth d uses with the cooperation of terminal surface tooth b.
Furthermore, the connecting threads of the transmission sleeve, the jarring oil cylinder, the high-pressure oil cylinder and the auxiliary oil cylinder are taper pipe threads.
Further, when the jarring shaft moves up to the limit position, a gap is formed between the face teeth a and the face teeth c.
Furthermore, the connecting threads between the transmission sleeve and the jarring oil cylinder, between the high-pressure oil cylinder and between the transmission sleeve and the auxiliary oil cylinder are right-handed threads, the connecting threads between the limiting disc and the jarring shaft are left-handed threads, and the drill bit rotates clockwise along the overlooking direction.
Furthermore, a cylindrical pipe is in threaded connection between the limiting disc and the jarring shaft.
Furthermore, the end face teeth a and the end face teeth b are the same in structure, the end face teeth c and the end face teeth d are the same in structure, and the upper end and the lower end of the piston are of a symmetrical structure.
Further, the face teeth a, b, c, and d have inclined surfaces on both sides of the tooth tips.
The invention has the beneficial effects that: the piston not only serves as a sealing structural part of hydraulic oil of the jar in the application. Meanwhile, the limiting disc is used as a transmission connecting piece to be connected with the auxiliary oil cylinder, and the limiting disc is detached from the lower section of the impact shaft by the resistance of the auxiliary oil cylinder. The drilling rod on the upper section of the shocking shaft and the fracture part can be pulled out of the well quickly. The maintenance time can be greatly shortened, and the economic loss is reduced.
Drawings
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Fig. 1 shows a sectional view of the overall structure of the jar.
Fig. 2 shows an enlarged view at a in fig. 1.
Fig. 3 shows an enlarged view at F in fig. 1.
Fig. 4 shows a cross-sectional view of the slave cylinder.
Fig. 5 shows a cross-sectional view along the direction E-E in fig. 5.
Figure 6 shows a cross-sectional view of the piston.
Fig. 7 shows a top view of the piston.
Figure 8 shows a cross-sectional view of the spacing disk.
Fig. 9 shows a top view of the spacing disk.
The labels in the figure are: the device comprises a transmission shaft-1, a transmission sleeve-2, a jarring oil cylinder-3, a high-pressure oil cylinder-4, an auxiliary oil cylinder-5, end face teeth c-51, a jarring shaft-6, a limiting disc-61, end face teeth d-62, a piston-7, end face teeth a-71 and end face teeth b-72.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, but the described embodiments of the present invention are a part of the embodiments of the present invention, not all of the embodiments of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only for convenience of describing the present invention and simplifying the description. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1-9, a drill jar comprising: the device comprises a transmission shaft 1, a transmission sleeve 2, a jarring oil cylinder 3, a high-pressure oil cylinder 4, an auxiliary oil cylinder 5, a jarring shaft 6 and a piston 7.
Specifically, the external spline of the transmission shaft 1 is matched with the internal spline of the transmission sleeve 2. The upper end of the shock shaft 6 is connected with the lower end of the transmission shaft 1 through threads. The transmission sleeve 2 is sequentially connected with the jarring oil cylinder 3, the high-pressure oil cylinder 4 and the auxiliary oil cylinder 5 through threads. The piston 7 is slidably sleeved on the lower section of the jar shaft 6, the piston 7 is movably arranged along the axis of the jar shaft 6, and the piston 7 is slidably arranged in the auxiliary oil cylinder 5.
Specifically, as shown in fig. 2 and 4, the piston 7 has end face teeth a71 on the upper end face and end face teeth b72 on the lower end face.
Specifically, as shown in fig. 2, 4 and 5, the top surface of the inner hole of the auxiliary cylinder 5 is provided with a face tooth c51, the face tooth c51 is matched with the face tooth a71 for transmitting torque, and the face tooth c51 is not contacted with the face tooth a71 during normal drilling.
Specifically, the jar shaft 6 is provided with a limiting disc 61, the limiting disc 61 is in threaded connection with the jar shaft 6, and the screwing direction of the threads is opposite to the rotating direction of the drill rod, so that when the drill rod rotates, the limiting disc 61 can be loosened from the jar shaft 6.
Specifically, as shown in fig. 2, 8 and 9, the top surface of the stopper disk 61 is designed with a face tooth d62, and the face tooth d62 is used in cooperation with the face tooth b 72.
Preferably, in order to ensure the sealing performance and the stability of the connecting structure, the connecting threads of the transmission sleeve 2, the jarring cylinder 3, the high-pressure cylinder 4 and the auxiliary cylinder 5 are taper pipe threads.
The connecting threads between the transmission sleeve 2 and the jarring oil cylinder 3, the high-pressure oil cylinder 4 and the auxiliary oil cylinder 5 are right-handed threads, the connecting threads between the limiting disc 61 and the jarring shaft 6 are left-handed threads, and the drill bit rotates clockwise along the overlooking direction.
Preferably, be cylinder pipe threaded connection between spacing dish 61 and the jar axle 6, compare and loosen more easily in conical screw thread, and process relative conical screw thread simpler, the cost is lower.
Preferably, as shown in fig. 6, the face teeth a71 are identical in structure to the face teeth b 72. As shown in fig. 5 and 9, the face tooth c51 has the same structure as the face tooth d62, so as to facilitate uniform parameter processing and reduce the processing and installation difficulty.
Preferably, as shown in fig. 6, the upper and lower ends of the piston 7 are symmetrical, and the upper and lower end faces are interchanged when viewed in use, so that the mounting direction of the piston 7 is not distinguished, and the assembly requirement is reduced.
Preferably, the tooth tips of the face teeth a71, b72, c51 and d62 are beveled on both sides to facilitate guidance for rapid engagement of the parts with each other.
Preferably, when the chuck jar is operated, the striking shaft 6 is moved upward by the upward striking, and even when the striking shaft 6 is moved upward to the extreme position as shown in fig. 3, the top surface of the striking shaft 6 is in contact with the bottom surface of the driving sleeve 2, and the face teeth a71 and the face teeth c51 have a gap therebetween. The face teeth a71 and the face teeth c51 are prevented from being matched with each other to transmit the torque required by drilling during normal drilling operation, and the rotating torque is prevented from being transmitted to the limiting disc 61, so that the limiting disc 61 is prevented from loosening during normal operation. Meanwhile, the accuracy of torque transmission between the transmission shaft 1 and the transmission sleeve 2 can be avoided from being influenced.
In one embodiment of the present application, when hydraulic oil leaks from inside the jar, resulting in a reduction in the jar internal pressure, the piston 7 will move upward along the jar shaft 6, and in this condition, the face teeth a71 will likely engage with the face teeth c 51. When the face teeth a71 are engaged with the face teeth c51, the face teeth b72 are disengaged from the face teeth d62, thereby preventing the impact shaft 6 from transmitting torque to the stopper plate 61.
As another example of the present application, during normal drilling or jar operation, there is a space between the face teeth a71 and the face teeth c51 and between the face teeth b72 and the face teeth d62 to prevent the jar shaft 6 from transmitting torque to the retainer disc 61.
Therefore, only when the drill rod or jar is broken, the impact shaft 6 is actively pulled upward to engage the face teeth b72 with the face teeth d62 and the face teeth a71 with the face teeth c51, and only in this state, the rotational torque of the impact shaft 6 can be transmitted to the stopper disc 61.
The specific implementation scheme is as follows: the sticking usually occurs near the drill bit and the jar is usually mounted a predetermined distance above the drill bit, so the sticking will generally be at a location below the jar. In this embodiment, if any one of the three threaded connection portions b, c, and d in fig. 1 is broken, the drill rod may be pulled upward to drive the shocking shaft 6 to move upward, and the drill rod may be rotated or stopped during the pulling process. Until the end face tooth b72 is meshed with the end face tooth d62, the end face tooth a71 is meshed with the end face tooth c51, the upward pulling force is blocked, and meanwhile, the limiting disc 61, the piston 7 and the auxiliary oil cylinder 5 are tightly connected together through the pulling force. The drill rod and the jar shaft 6 are rotated rightwards, and the limiting disc 61, the piston 7 and the auxiliary oil cylinder 5 are connected together, so that the parts between the auxiliary oil cylinder 5 and the drill bit are in a clamping stagnation state and cannot rotate. Utilize the rotation resistance that auxiliary cylinder 5 provided to block spacing dish 61, because be left-handed threaded connection between spacing dish 61 and the jarring axle 6, consequently when the tightening torque between spacing dish 61 and the jarring axle 6 is greater than to rotary torque, spacing dish 61 will become flexible, until separate with jarring axle 6 completely. Then the jar shaft 6 and the upper section of the drill rod can be taken out smoothly. And then fishing out the drill bit and the auxiliary oil cylinder part left in the well by utilizing fishing equipment.
Through the structural design of this application, greatly shortened the time that the drilling rod was extracted, the faster salvage drill bit position of being convenient for to realize faster reworking, reduce economic loss.
The foregoing is only a preferred embodiment of the present invention and is not intended to be exhaustive or to limit the invention. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention.
Claims (6)
1. A drill jar comprising: the utility model is characterized in that the transmission shaft (1), the transmission sleeve (2), the jar oil cylinder (3), the high-pressure oil cylinder (4), the auxiliary oil cylinder (5), the jar shaft (6) and the piston (7), the external spline of the transmission shaft (1) is matched with the internal spline of the transmission sleeve (2), the upper end of the jar shaft (6) is connected with the lower end of the transmission shaft (1), the transmission sleeve (2) is sequentially connected with the jar oil cylinder (3), the high-pressure oil cylinder (4) and the auxiliary oil cylinder (5) through threads, the piston (7) is sleeved on the lower section of the jar shaft (6) in a sliding way, and the piston (7) is arranged in the auxiliary oil cylinder (5) in a sliding way,
the upper end surface of the piston (7) is provided with end surface teeth a (71), and the lower end surface is provided with end surface teeth b (72);
the top surface of an inner hole of the auxiliary oil cylinder (5) is provided with end surface teeth c (51), and the end surface teeth c (51) are matched with the end surface teeth a (71) for use;
the shocking shaft (6) is provided with a limiting disc (61), the limiting disc (61) is in threaded connection with the shocking shaft (6), the screwing direction of threads is opposite to the rotating direction of the drill rod, the top surface of the limiting disc (61) is provided with end surface teeth d (62), and the end surface teeth d (62) are matched with the end surface teeth b (72) for use;
when the shocking shaft (6) moves upwards to the limit position, a gap is formed between the end face teeth a (71) and the end face teeth c (51).
2. A jar as drilling according to claim 1 wherein the connecting threads of the driving sleeve (2) and the jar cylinder (3), the high pressure cylinder (4) and the auxiliary cylinder (5) are taper pipe threads.
3. The drilling jar as claimed in claim 1, wherein the connecting threads between the driving sleeve (2) and the jar cylinder (3), the high pressure cylinder (4) and the auxiliary cylinder (5) are right-handed threads, the connecting threads between the limiting disc (61) and the jar shaft (6) are left-handed threads, and the drill bit rotates clockwise in the top view direction.
4. A drilling jar as claimed in claim 1 wherein the stop disc (61) is in threaded connection with the jar shaft (6) via a cylindrical tube.
5. A drilling jar as claimed in claim 1 wherein the face teeth a (71) are of the same configuration as the face teeth b (72), the face teeth c (51) are of the same configuration as the face teeth d (62), and the upper and lower ends of the piston (7) are of symmetrical configuration.
6. A drill jar as defined in claim 1 wherein the face teeth a (71), b (72), c (51) and d (62) are beveled on either side of their crest.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111457330.XA CN113846986B (en) | 2021-12-02 | 2021-12-02 | Jar while drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111457330.XA CN113846986B (en) | 2021-12-02 | 2021-12-02 | Jar while drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113846986A CN113846986A (en) | 2021-12-28 |
| CN113846986B true CN113846986B (en) | 2022-02-15 |
Family
ID=78982685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111457330.XA Active CN113846986B (en) | 2021-12-02 | 2021-12-02 | Jar while drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113846986B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715454A (en) * | 1986-06-03 | 1987-12-29 | Teng Chuan C | Mechanical directional drilling jar with swivel means |
| CA2223144A1 (en) * | 1995-06-07 | 1996-12-19 | Dailey International Inc. | Mechanical-hydraulic double-acting drilling jar |
| CN112664155A (en) * | 2021-01-12 | 2021-04-16 | 成都阿斯贝瑞科技有限公司 | Novel hydraulic bidirectional jar for coiled tubing |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1370337A (en) * | 1970-10-20 | 1974-10-16 | Schlumberger Technoloty Corp | Mechanical jar |
| US4004643A (en) * | 1976-03-03 | 1977-01-25 | Newman James L | Mechanical drilling jar |
| GB1600999A (en) * | 1977-10-24 | 1981-10-21 | Wenzel K H | Hydraulic bumper jar |
| DE3142722C2 (en) * | 1981-10-28 | 1983-10-13 | Christensen, Inc., 84115 Salt Lake City, Utah | Mechanical guillotine shears |
| CA2160417C (en) * | 1995-10-12 | 2001-07-31 | Kenneth Hugo Wenzel | Valve for a two way hydraulic drilling jar |
| CN201212368Y (en) * | 2008-06-30 | 2009-03-25 | 贵州高峰石油机械有限责任公司 | Mechanical jar while drilling |
| CN101493000B (en) * | 2009-03-03 | 2012-01-11 | 西南石油大学 | Rotary jar |
| CN202578605U (en) * | 2012-04-23 | 2012-12-05 | 吉林大学 | Striking-while-drilling jar knocker |
| CN205689155U (en) * | 2016-06-08 | 2016-11-16 | 牡丹江鑫北方石油钻具有限责任公司 | A kind of self-locking compensation-type bidirectional hydraulic impacting device for drilling machine |
| CN206376786U (en) * | 2016-12-23 | 2017-08-04 | 上海天合石油工程股份有限公司 | A kind of hydraulic drilling jar |
| GB2570316A (en) * | 2018-01-19 | 2019-07-24 | Rotojar Ltd | Jarring apparatus |
| CN210134838U (en) * | 2019-04-19 | 2020-03-10 | 中国石油天然气股份有限公司 | Conduction type mechanical jar for downhole operation |
| CN210548612U (en) * | 2019-07-22 | 2020-05-19 | 西安新三鸣汽车零部件有限责任公司 | End face tooth replacing torque transmission structure with end face flat keys |
| CN213231293U (en) * | 2020-09-23 | 2021-05-18 | 中联重科股份有限公司 | Rotary driving mechanism, arm support assembly and engineering machinery |
| CN113279694B (en) * | 2021-06-15 | 2022-05-20 | 成都高峰石油机械有限公司 | Ultrashort two-way full-hydraulic drilling jar |
-
2021
- 2021-12-02 CN CN202111457330.XA patent/CN113846986B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715454A (en) * | 1986-06-03 | 1987-12-29 | Teng Chuan C | Mechanical directional drilling jar with swivel means |
| CA2223144A1 (en) * | 1995-06-07 | 1996-12-19 | Dailey International Inc. | Mechanical-hydraulic double-acting drilling jar |
| CN112664155A (en) * | 2021-01-12 | 2021-04-16 | 成都阿斯贝瑞科技有限公司 | Novel hydraulic bidirectional jar for coiled tubing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113846986A (en) | 2021-12-28 |
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