CN110185414B - External expansion type soluble bridge plug - Google Patents
External expansion type soluble bridge plug Download PDFInfo
- Publication number
- CN110185414B CN110185414B CN201910605436.6A CN201910605436A CN110185414B CN 110185414 B CN110185414 B CN 110185414B CN 201910605436 A CN201910605436 A CN 201910605436A CN 110185414 B CN110185414 B CN 110185414B
- Authority
- CN
- China
- Prior art keywords
- cone
- baffle ring
- expansion type
- pin
- slip seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000002195 soluble material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 11
- 238000004090 dissolution Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000008161 low-grade oil Substances 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
Abstract
The invention relates to an external expansion type soluble bridge plug. The technical proposal is as follows: the lower end of the connector is movably connected with the upper end of the pull rod, a central pipe is sleeved outside the pull rod, an upper slip seat, an upper cone, a first baffle ring, a second baffle ring, a double setting cone, an outer expansion rubber cylinder, a double setting cone, a second baffle ring, a first baffle ring and a lower cone are sleeved outside the central pipe from top to bottom, a lower slip seat is sleeved outside the lower cone, and a base is sleeved outside the lower slip seat and the pull rod; both ends of the inner hole of the outer expansion type rubber cylinder are of conical structures; the double setting cone is in conical surface matching contact with the second baffle ring and the outer expansion type rubber cylinder, and slip teeth are inlaid on the upper slip seat and the lower slip seat. The beneficial effects are that: the rubber cylinder is of an outer expansion structure, so that the sealing compensation is large, and the sealing effect is good; the pull rod is designed in the inner hole of the central tube, the central tube is not stressed, the strength requirement of the central tube is small, and the inner diameter design is much larger; the slip teeth are made of embedded superhard ceramic material, so that the setting is ensured to be firm.
Description
Technical Field
The invention relates to the field of petroleum exploration and oilfield exploitation, in particular to an external expansion type soluble bridge plug.
Background
The horizontal well development has the characteristics of large oil drainage area, high single well yield, high reserve utilization degree, high recovery ratio and the like, and the horizontal well development is utilized as an effective means for improving the comprehensive development benefit along with the continuous deep development of low-grade oil reservoirs. The perforation combined staged fracturing technology is a key technology for developing low-grade oil reservoirs in horizontal wells, has the characteristics of simple construction pipe column structure, no residual in a shaft and convenience for later measure operation, and has the advantages that the soluble bridge plug has incomparable advantages such as drillability and recoverability due to the autolycity of the soluble bridge plug.
The invention discloses a Chinese patent document with the publication number 109899028A, the patent name is a soluble bridge plug, which comprises a bridge plug main body and a dissolution assisting mechanism fixedly connected with the bridge plug main body, wherein the bridge plug main body comprises a central tube, and the bridge plug main body further comprises a guide ring, an upper slip, a lock ring, an upper cone, a three-cone mechanism, a lower cone, a lower slip and a guide shoe which are sleeved on the central tube from left to right in sequence, wherein the guide ring, the upper slip, the lock ring, the upper cone, the three-cone mechanism, the lower cone and the lower slip are respectively and slidably connected with the central tube, the guide shoe is fixedly connected with the end part of the central tube, one end of the upper cone is inserted into the lower part of the upper slip, one end of the lower cone is inserted into the lower part of the lower slip, and the dissolution assisting mechanism comprises a plurality of dissolution assisting blocks fixedly connected with the outer surface of the bridge plug main body, so that the dissolution speed of the bridge plug is effectively controlled.
The Chinese patent document discloses a number 109505559A, the patent name is a soluble bridge plug, it includes dabber, packing element, cone sleeve, slips and lower joint nipple joint, and the dabber is hollow structure, and the dabber is equipped with spacing boss, packing element and cone sleeve slip in proper order are established the dabber surface in spacing boss one side, and the slips is a plurality of, and a plurality of slips are located cone telescopic conical surface of cone through radial limit structure, and the one end slip cover of lower joint nipple joint is established at the other end of dabber and with the slips butt, is equipped with a plurality of slips tooth on every slips, and the slips tooth is the truncated cylinder, and the slips tooth is including the lower slips tooth that the inclined cross-section direction is downhill slope along cone telescopic conical surface direction of cone and the last slips tooth that the inclined cross-section direction is upwards slope along cone telescopic conical surface direction of cone. The invention reduces the risk of blocking the wind in the pit and reduces the potential safety hazard of oil and gas well operation.
However, the prior art soluble bridge plugs often suffer from unreliable seals during fracturing operations due to low material strength.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art, and provides an external expansion type soluble bridge plug, so that the reliable sealing of the bridge plug in the field application of the perforation combined staged fracturing technology is realized, the construction risk is reduced, and the effectiveness of measures is improved.
The invention relates to an external expansion type soluble bridge plug, which adopts the technical scheme that: the slip joint comprises a connector (1), a pull rod (2), a central tube (3), an upper slip seat (4), slip teeth (5), an upper cone (6), a first baffle ring (7), a second baffle ring (8), a double-setting cone (9), an outer expansion type rubber cylinder (10), a lower cone (11), a lower slip seat (12) and a base (13); the lower end of the connector (1) is movably connected with the upper end of the pull rod (2), a central tube (3) is sleeved outside the pull rod (2), an upper slip seat (4), an upper cone (6), a first baffle ring (7), a second baffle ring (8), a double-setting cone (9), an outer expansion type rubber cylinder (10), a double-setting cone (9), a second baffle ring (8), a first baffle ring (7) and a lower cone (11) are sequentially sleeved outside the central tube (3) from top to bottom, a lower slip seat (12) is sleeved outside the lower cone (11) and the pull rod (2), and a base (13) is sleeved outside the lower slip seat (12) and the pull rod (2); both ends of the inner hole of the outer expansion type rubber cylinder (10) are of conical structures; the double setting cone (9) is in conical surface matching contact with the second baffle ring (8) and the outer expansion type rubber cylinder (10), and slip teeth (5) are inlaid on the upper slip seat (4) and the lower slip seat (12).
Preferably, the first baffle ring (7) and the second baffle ring (8) are bowl-shaped structures with outward expansion type rubber barrels (10) with openings, and at least 3 axial grooves (555) are formed in the circumferential direction.
Preferably, at least one first pin hole (333) is machined in the upper cone (6), a first pin (14) is installed in the first pin hole (333), after the assembly of the central tube (3) and the upper cone (6) is completed, the first pin ring groove (111) and the first pin hole (333) are axially aligned, and the first pin (14) is fastened in the first pin ring groove (111) so that the central tube (3) and the upper cone (6) are fixedly connected.
Preferably, at least one second pin hole (444) is formed in the lower cone (11), a second pin (15) is installed in the second pin hole (444), after the central tube (3) and the lower cone (11) are assembled, the second pin ring groove (222) and the second pin hole (444) are axially aligned, and the second pin (15) is fastened in the second pin ring groove (222) so that the central tube (3) and the lower cone (11) are fixedly connected.
Preferably, the slip teeth (5) are made of ceramic materials, and the lower part of the upper slip seat (4) is in conical surface matching contact with the upper part of the upper cone (6); the lower part of the lower cone (11) is in conical surface fit contact with the upper part of the lower slip seat (12).
Preferably, the upper slip bowl (4) and the lower slip bowl (12) are formed into at least three parts with low connection strength in the circumferential direction by adopting a material removing method.
Preferably, a first pin ring groove (111) is formed in the upper portion of the central tube, and a second pin ring groove (222) is formed in the lower portion of the central tube (3).
The upper slip seat (4), the upper cone (6), the first baffle ring (7), the second baffle ring (8), the double-setting cone (9), the outer expansion type rubber cylinder (10), the lower cone (11), the lower slip seat (12) and the base (13) are made of soluble materials.
The beneficial effects of the invention are as follows: 1. the rubber cylinder is of an outer expansion structure, so that the sealing compensation is large, and the sealing effect is good; 2. the integral slips are adopted, so that the processing difficulty and cost of the traditional slips are reduced; 3. the traditional bridge plug setting is to pull a central tube to compress a rubber cylinder and slips, and the central tube has high strength, so that the inner diameter of the central tube is smaller; the bridge plug is characterized in that a high-strength insoluble metal pull rod is designed in an inner hole of a central tube, the central tube is not stressed, the strength requirement of the central tube is small, and the inner diameter design is much larger, so that the bridge plug is beneficial to quick dissolution and oil gas production; 4. the slip teeth are made of embedded superhard ceramic material, so that the setting is ensured to be firm.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a half cross-sectional view of the center tube;
FIG. 3 is a three-dimensional view of the upper slip bowl;
in the upper graph: the slip comprises a connector 1, a pull rod 2, a central tube 3, an upper slip seat 4, slip teeth 5, an upper cone 6, a first baffle ring 7, a second baffle ring 8, a double setting cone 9, an outer expansion type rubber cylinder 10, a lower cone 11, a lower slip seat 12, a base 13, a first pin 14 and a second pin 15; first pin ring groove 111, second pin ring groove 222, first pin hole 333, second pin hole 444, and axial groove 555.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1 referring to fig. 1, the invention provides an external expansion type soluble bridge plug, which comprises a connector 1, a pull rod 2, a central tube 3, an upper slip seat 4, slip teeth 5, an upper cone 6, a first baffle ring 7, a second baffle ring 8, a double setting cone 9, an external expansion type rubber cylinder 10, a lower cone 11, a lower slip seat 12, a base 13, a first pin 14 and a second pin 15; the upper end of the connector 1 is provided with internal threads, the lower end of the connector 1 is in threaded connection with the upper end of the pull rod 2, a central tube 3 is sleeved outside the pull rod 2, a first pin ring groove 111 is processed at the upper part of the central tube, a second pin ring groove 222 is processed at the lower part of the central tube 3, an upper slip seat 4, an upper cone 6, a first baffle ring 7, a second baffle ring 8, a double setting cone 9, an outer expansion cone 10, a double setting cone 9, a second baffle ring 8, a first baffle ring 7 and a lower cone 11 are sequentially sleeved outside the central tube 3 from top to bottom, a lower slip seat 12 is sleeved outside the lower cone 11 and the pull rod 2, a base 13 is sleeved outside the lower slip seat 12, and the pull rod 2 and the base 13 are fixedly connected through threads; both ends of the inner hole of the outer expansion type rubber cylinder 10 are of conical structures; the double-setting cone 9 is in conical surface fit contact with the second baffle ring 8 and the outer expansion rubber cylinder 10; the first baffle ring 7 and the second baffle ring 8 are both bowl-shaped structures with outward expansion type rubber barrels 10, and at least 3 axial grooves 555 are formed in the circumferential direction; the upper cone 6 is provided with at least one first pin hole 333, the first pin hole 333 is internally provided with a first pin 14, after the assembly of the central tube 3 and the upper cone 6 is completed, the first pin ring groove 111 and the first pin hole 333 are axially aligned, the first pin 14 is fastened into the first pin ring groove 111 to fixedly connect the central tube 3 and the upper cone 6, the lower cone 11 is provided with at least one second pin hole 444, the second pin hole 444 is internally provided with a second pin 15, after the assembly of the central tube 3 and the lower cone 11 is completed, the second pin ring groove 222 and the second pin hole 444 are axially aligned, and the second pin 15 is fastened into the second pin ring groove 222 to fixedly connect the central tube 3 and the lower cone 11;
referring to fig. 3, a slip tooth 5 is inlaid on an upper slip seat 4 of the invention, the slip tooth 5 is made of ceramic material, and the lower part of the upper slip seat 4 is in conical surface matched contact with the upper part of an upper cone 6; the lower slip seat 12 is inlaid with slip teeth 5, the slip teeth 5 are made of ceramic materials, and the lower part of the lower cone 11 is in conical surface fit contact with the upper part of the lower slip seat 12; the upper slip bowl 4 and the lower slip bowl 12 are formed into at least three parts with low connection strength in the circumferential direction by a material removing method.
And the upper slip seat 4, the upper cone 6, the first baffle ring 7, the second baffle ring 8, the double setting cone 9, the outer expansion type rubber cylinder 10, the lower cone 11, the lower slip seat 12 and the base 13 are made of soluble materials.
When the hydraulic oil pressure setting tool is used, the connector 1 and the setting tool are connected to the lower part of the setting tool through threads, then are integrally connected to the bottom of an oil pipe column, are conveyed to reach a designed position through the oil pipe, are pressed by 5-20 MPa from the oil pipe, under the action of the oil pressure, a setting force F which is proportional to the oil pressure is generated on the setting tool, the setting force F acts on the surface 66, the setting force F firstly exceeds the connection strength of the lower slip seat 12 in the circumferential direction, so that the lower slip seat 12 is at least broken into more than three parts in the circumferential direction and is set on the casing wall, the setting pressure F is continuously increased along with the increase of the oil pressure, when the setting force F exceeds the shearing strength of the pin 15, the pin 15 is sheared, the setting force F is sequentially transmitted to the baffle ring 17, the baffle ring 28, the double-setting cone 9, the outer expansion rubber cylinder 10, the double-setting cone 9, the baffle ring 28 and the baffle ring 17, under the action of the contact conical surface, the double-setting cone 9 enables the setting force F to generate an external expansion and a compression setting force on the external expansion type rubber cylinder 10, the setting effect of the external expansion type rubber cylinder 10 is better, under the action of the setting force F, the double-setting cone 9 expands the baffle rings 28 and 17 on the upper and lower parts of the external expansion type rubber cylinder 10 to the casing wall, the deformation space of the external expansion type rubber cylinder 10 is limited, the protruding effect of the external expansion type rubber cylinder 10 is reduced, the setting pressure difference is improved, the oil pressure is continuously improved, the setting pressure F is continuously increased, the pin 14 is sheared, the upper slip seat 4 is circumferentially broken, the upper slip seat 4 is set on the casing wall, the bridge plug setting effect is continuously improved along with the continuous increase of the oil pressure, and when the setting force reaches the design parameters, the connecting threads of the pull rod 2 and the base 13 are broken, and the bridge plug setting is completed.
The above description is only a few preferred embodiments of the present invention, and any person skilled in the art may make modifications to the above described embodiments or make modifications to the same. Therefore, any simple modification or equivalent made according to the technical solution of the present invention falls within the scope of the protection claimed by the present invention.
Claims (5)
1. An external expansion type soluble bridge plug is characterized in that: the slip joint comprises a connector (1), a pull rod (2), a central tube (3), an upper slip seat (4), slip teeth (5), an upper cone (6), a first baffle ring (7), a second baffle ring (8), a double-setting cone (9), an outer expansion type rubber cylinder (10), a lower cone (11), a lower slip seat (12) and a base (13); the lower end of the connector (1) is movably connected with the upper end of the pull rod (2), a central tube (3) is sleeved outside the pull rod (2), an upper slip seat (4), an upper cone (6), a first baffle ring (7), a second baffle ring (8), a double-setting cone (9), an outer expansion type rubber cylinder (10), a double-setting cone (9), a second baffle ring (8), a first baffle ring (7) and a lower cone (11) are sequentially sleeved outside the central tube (3) from top to bottom, a lower slip seat (12) is sleeved outside the lower cone (11) and the pull rod (2), and a base (13) is sleeved outside the lower slip seat (12) and the pull rod (2); both ends of the inner hole of the outer expansion type rubber cylinder (10) are of conical structures; the double setting cone (9) is in conical surface fit contact with the second baffle ring (8) and the outer expansion type rubber cylinder (10), and slip teeth (5) are inlaid on the upper slip seat (4) and the lower slip seat (12);
the first baffle ring (7) and the second baffle ring (8) are bowl-shaped structures with outward expansion type rubber barrels (10) with openings, and at least 3 axial grooves (555) are formed in the circumferential direction;
at least one first pin hole (333) is formed in the upper cone (6), a first pin (14) is arranged in the first pin hole (333), after the central tube (3) and the upper cone (6) are assembled, a first pin ring groove (111) and the first pin hole (333) are axially aligned, and the first pin (14) is fastened into the first pin ring groove (111) so that the central tube (3) and the upper cone (6) are fixedly connected;
the lower cone (11) is provided with at least one second pin hole (444), the second pin hole (444) is internally provided with a second pin (15), after the assembly of the central tube (3) and the lower cone (11) is completed, the second pin ring groove (222) and the second pin hole (444) are axially aligned, and the second pin (15) is fastened in the second pin ring groove (222) so that the central tube (3) and the lower cone (11) are fixedly connected.
2. The external expansion type soluble bridge plug according to claim 1, wherein: the slip teeth (5) are made of ceramic materials, and the lower part of the upper slip seat (4) is in conical surface fit contact with the upper part of the upper cone (6); the lower part of the lower cone (11) is in conical surface fit contact with the upper part of the lower slip seat (12).
3. The external expansion type soluble bridge plug according to claim 2, wherein: the upper slip seat (4) and the lower slip seat (12) form at least three parts with low connection strength in the circumferential direction by adopting a material removing method.
4. The external expansion type soluble bridge plug according to claim 1, wherein: the upper part of the central tube (3) is provided with a first pin ring groove (111), and the lower part of the central tube (3) is provided with a second pin ring groove (222).
5. The external expansion type soluble bridge plug according to claim 1, wherein: the upper slip seat (4), the upper cone (6), the first baffle ring (7), the second baffle ring (8), the double-setting cone (9), the outer expansion type rubber cylinder (10), the lower cone (11), the lower slip seat (12) and the base (13) are made of soluble materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910605436.6A CN110185414B (en) | 2019-07-05 | 2019-07-05 | External expansion type soluble bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910605436.6A CN110185414B (en) | 2019-07-05 | 2019-07-05 | External expansion type soluble bridge plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110185414A CN110185414A (en) | 2019-08-30 |
| CN110185414B true CN110185414B (en) | 2024-03-19 |
Family
ID=67725148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910605436.6A Active CN110185414B (en) | 2019-07-05 | 2019-07-05 | External expansion type soluble bridge plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110185414B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110792408A (en) | 2019-11-13 | 2020-02-14 | 百勤能源科技（惠州）有限公司 | Hard-sealing soluble bridge plug |
| CN113107413B (en) * | 2020-01-09 | 2022-06-03 | 中国石油天然气股份有限公司 | Split type all-metal sealing device |
| CN113090227B (en) * | 2020-01-09 | 2022-07-05 | 中国石油天然气股份有限公司 | Multilayer quick-dissolving fracturing string |
| CN111322031B (en) * | 2020-03-29 | 2022-05-13 | 陈玉 | Easy-to-mount combined rubber cylinder bridge plug |
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|---|---|---|---|---|
| WO2017029622A1 (en) * | 2015-08-19 | 2017-02-23 | Global Technology And Innovation Limited | An expander assembly |
| CN106894787A (en) * | 2017-03-06 | 2017-06-27 | 四机赛瓦石油钻采设备有限公司 | A kind of single deck tape-recorder watt big orifice bridging plug and its set method |
| CN208073423U (en) * | 2018-04-10 | 2018-11-09 | 重庆地质矿产研究院 | Single slip type soluble bridge plug |
| CN109236230A (en) * | 2018-11-28 | 2019-01-18 | 中国石油集团渤海钻探工程有限公司 | A kind of magnesium-base metal dissolvable bridge plug |
| CN210343302U (en) * | 2019-07-05 | 2020-04-17 | 山东博赛特石油技术有限公司 | External expansion type soluble bridge plug |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10487617B2 (en) * | 2017-04-20 | 2019-11-26 | Aimin Chen | Central shaft for bridge plug, bridge plug and setting method for the same |
-
2019
- 2019-07-05 CN CN201910605436.6A patent/CN110185414B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017029622A1 (en) * | 2015-08-19 | 2017-02-23 | Global Technology And Innovation Limited | An expander assembly |
| CN106894787A (en) * | 2017-03-06 | 2017-06-27 | 四机赛瓦石油钻采设备有限公司 | A kind of single deck tape-recorder watt big orifice bridging plug and its set method |
| CN208073423U (en) * | 2018-04-10 | 2018-11-09 | 重庆地质矿产研究院 | Single slip type soluble bridge plug |
| CN109236230A (en) * | 2018-11-28 | 2019-01-18 | 中国石油集团渤海钻探工程有限公司 | A kind of magnesium-base metal dissolvable bridge plug |
| CN210343302U (en) * | 2019-07-05 | 2020-04-17 | 山东博赛特石油技术有限公司 | External expansion type soluble bridge plug |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110185414A (en) | 2019-08-30 |
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