CN113047807A - Bridge plug for oil field - Google Patents
Bridge plug for oil field Download PDFInfo
- Publication number
- CN113047807A CN113047807A CN202110393145.2A CN202110393145A CN113047807A CN 113047807 A CN113047807 A CN 113047807A CN 202110393145 A CN202110393145 A CN 202110393145A CN 113047807 A CN113047807 A CN 113047807A
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- CN
- China
- Prior art keywords
- central tube
- ring
- taper sleeve
- sleeve
- fixed
- 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.)
- Granted
Links
- 238000004090 dissolution Methods 0.000 claims abstract description 33
- 230000001737 promoting effect Effects 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 11
- 239000002195 soluble material Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 7
- 238000004873 anchoring Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Centrifugal Separators (AREA)
Abstract
The invention relates to the field of oil extraction equipment, in particular to a bridge plug for an oil field. Including the center tube, the cover is equipped with the drive cover on the center tube, the drive cover passes through limit structure with the center tube and is connected, sliding sleeve is equipped with the sliding sleeve on the center tube of drive cover below, the sliding sleeve lower extreme is fixed with the epicone cover, be fixed with solid fixed ring on the center tube in the epicone cover, gu fixed ring outer fringe and epicone cover inner fringe sliding contact, be fixed with the end ring on the center tube of epicone cover below, the end ring upper end is fixed with down the taper sleeve, go up the taper sleeve and set up with down the taper sleeve upper and lower symmetry, it is provided with the inner ring to slide on the center tube in the lower taper sleeve, the inner ring outside is fixed with the. The invention has low manufacturing cost and good anchoring effect after setting, can ensure the setting effect, can improve the welding speed of the solution to each part by arranging the dissolution promoting particles, the upper dissolution promoting ring and the lower dissolution promoting ring, can quickly dissolve when deblocking, and further can improve the construction efficiency.
Description
Technical Field
The invention relates to the field of oil extraction equipment, in particular to a bridge plug for an oil field.
Background
The bridge plug staged fracturing is an important means for effectively developing unconventional oil gas, the soluble fracturing bridge plug automatically dissolves after fracturing without milling, so that the construction risk and the construction cost can be greatly reduced, and the soluble fracturing bridge plug body is made of a magnesium-aluminum alloy soluble material and can react with shaft liquid after fracturing, so that the dissolving purpose is achieved. The dissolvable material is generally not resistant to temperature and cannot meet the application environment with high compressive strength, meanwhile, when the degradable bridge plug is designed, in order to reduce dissolved residual fragments and exert the advantage of dissolubility, the design is as simple as possible, and the non-drillable parts of the conventional bridge plug, generally slips and expansion elements, are removed, so that the anchoring capacity and the sealing capacity are further weakened.
The soluble bridge plug can be dissolved in the water solution containing electrolyte by itself, and in the process of entering a well, the existing soluble bridge plug has a complex structure and high manufacturing cost, and when the soluble bridge plug needs to be unsealed, the welding speed is slow, so that the construction efficiency is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the bridge plug for the oil field, which has the advantages of simple structure, low manufacturing cost, good anchoring effect after setting, capability of ensuring the setting effect, capability of being quickly dissolved during deblocking and capability of improving the construction efficiency.
In order to achieve the purpose, the invention provides the technical scheme that:
a bridge plug for an oil field is made of a soluble material and comprises a central tube, wherein a driving sleeve is sleeved on the central tube, the driving sleeve is connected with the central tube through a limiting structure, a sliding sleeve is sleeved on the central tube below the driving sleeve in a sliding manner, an upper taper sleeve is fixed at the lower end of the sliding sleeve, a fixing ring is fixed on the central tube in the upper taper sleeve, the outer edge of the fixing ring is in sliding contact with the inner edge of the upper taper sleeve, a bottom ring is fixed on the central tube below the upper taper sleeve, a lower taper sleeve is fixed at the upper end of the bottom ring, the upper taper sleeve and the lower taper sleeve are symmetrically arranged from top to bottom, an inner ring is arranged on the central tube in the lower taper sleeve in a sliding manner, a movable ring is fixed on the outer side of the inner ring, the outer edge of the movable ring is in sliding contact with the inner edge of the lower taper sleeve, a plurality, the upper liquid outlet hole and the mandril are arranged in a staggered manner, a plurality of lower liquid outlet holes are formed in the central tube below the inner ring, a sealing plate for plugging the upper liquid outlet hole and the lower liquid outlet holes is fixed on the outer edge of the central tube, the sealing plate is fixedly connected with the central tube through shear pins, a plurality of open holes are formed in the inner side of the central tube between the fixing ring and the inner ring and correspond to the mandril, two inclined holes which are symmetrically arranged up and down are formed in the central tube outside the open holes and communicated with the open holes, the end parts of the upper inclined hole and the lower inclined hole which face the outer side of the central tube are mutually far away, the two inclined holes on one side of the central tube are plugged by the mandril, two communicating holes are formed in the mandril, the end parts of the two communicating holes on the mandril which face the outer side of the central tube are mutually far away, the lower end of the movable ring is fixedly embedded with a lower dissolution promoting ring, and the inner wall of the central tube is coated with a dissolution preventing coating.
Specifically, limit structure is including seting up a plurality of perpendicular grooves in the center tube outer fringe, erects the inslot and is fixed with a plurality of ratchets, sets up the blind hole that corresponds with perpendicular groove on the drive cover inner edge, and it is provided with the dog to slide in the blind hole, and the dog is blockked by the ratchet, and the dog passes through spring coupling with the hole bottom of blind hole.
Specifically, a plurality of perpendicular grooves are evenly distributed according to the axis circumference of the center pipe, and a plurality of ratchets are evenly distributed along the length direction of the perpendicular grooves.
Specifically, the diameter of the upper end of the upper taper sleeve is smaller than that of the lower end of the upper taper sleeve.
Specifically, the lower end of the upper taper sleeve and the upper end of the lower taper sleeve are both fixed with elastic rubber sealing sleeves.
Specifically, the plurality of grooves are uniformly distributed according to the circumference of the axis of the central tube.
Specifically, the upper dissolution promoting ring and the lower dissolution promoting ring are formed by pressing the dissolution promoting agent.
Specifically, dissolution promoting particles are placed in a space between the upper taper sleeve, the central tube, the sliding sleeve and the fixing ring, and dissolution promoting particles are placed in a space between the lower taper sleeve, the movable ring, the inner ring, the bottom ring and the central tube.
Compared with the prior art, the invention has the beneficial effects that:
the invention has simple structure and low manufacturing cost, can realize setting after the upper taper sleeve and the lower taper sleeve are expanded only by arranging a limit structure, has good anchoring effect after setting, can ensure the setting effect, can improve the welding speed of the solution to each part by arranging the dissolution promoting particles, the upper dissolution promoting ring and the lower dissolution promoting ring, can improve the dissolution speed by impacting the fixed ring, the movable ring, the upper taper sleeve and the lower taper sleeve by arranging the open holes, the inclined holes and the communication holes, can quickly dissolve when in deblocking, and further can improve the construction efficiency.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged view of the area a in fig. 1.
Fig. 3 is a top view of the retaining ring.
Detailed Description
As shown in fig. 1-3, an oil field bridge plug is made of a soluble material, and includes a central tube 1, a driving sleeve 2 is sleeved on the central tube 1, the driving sleeve 2 is connected with the central tube 1 through a limiting structure, a sliding sleeve 7 is sleeved on the central tube 1 below the driving sleeve 2 in a sliding manner, an upper taper sleeve 8 is fixed at the lower end of the sliding sleeve 7, a fixing ring 9 is fixed on the central tube 1 in the upper taper sleeve 8, the outer edge of the fixing ring 9 is in sliding contact with the inner edge of the upper taper sleeve 8, a bottom ring 16 is fixed on the central tube 1 below the upper taper sleeve 8, a lower taper sleeve 11 is fixed at the upper end of the bottom ring 16, the upper taper sleeve 8 and the lower taper sleeve 11 are arranged symmetrically up and down, elastic rubber sealing sleeves 15 are fixed at the lower end of the upper taper sleeve 8 and the upper end of the lower taper sleeve 11, the diameter of the upper end of the upper taper sleeve 8 is smaller than that of the lower taper, the outer edge of the movable ring 12 is in sliding contact with the inner edge of the lower taper sleeve 11, the inner edge of the fixed ring 9 is provided with a plurality of grooves 21, the plurality of grooves 21 are uniformly distributed according to the circumference of the axis of the central tube 1, the grooves 21 are internally provided with push rods 20 in a sliding manner, the upper ends of the push rods 20 are fixed at the lower ends of the sliding sleeve 7, the lower ends of the push rods 20 are in contact with the upper end of the inner ring 14, the central tube 1 below the sliding sleeve 7 is provided with a plurality of upper liquid outlet holes 25, the upper liquid outlet holes 25 and the push rods 20 are arranged in a staggered manner, the central tube 1 below the inner ring 14 is provided with a plurality of lower liquid outlet holes 18, the outer edge of the central tube 1 is fixed with a sealing plate 19 for sealing the upper liquid outlet holes 25 and the lower liquid outlet holes 18, the sealing plate 19 is fixedly connected with the central tube 1 through shear pins, the inner side of the central, the inclined holes 23 are communicated with the open holes 22, the end parts of the upper inclined hole 23 and the lower inclined hole 23 facing the outer side of the central tube 1 are far away from each other, the two inclined holes 23 on one side of the central tube are plugged by the mandril 20, the two communicating holes 24 are formed in the mandril 20, the end parts of the two communicating holes 24 on the mandril 20 facing the outer side of the central tube 1 are far away from each other, the two communicating holes 24 and the two inclined holes 23 on one side of the central tube are arranged in a staggered mode, the ball seats 17 are fixed in the central tube 1, the ball seats 17 correspond to the bottom ring 16, the upper end of the fixed ring 9 is fixedly embedded with the upper dissolution promoting ring 10, the lower end of the movable ring 12 is fixedly embedded with the lower dissolution promoting ring 13, the upper. Dissolution promoting particles are placed in the space between the upper taper sleeve 8, the central tube 1, the sliding sleeve 7 and the fixing ring 9, and dissolution promoting particles are placed in the space between the lower taper sleeve 11, the movable ring 12, the inner ring 14, the bottom ring 16 and the central tube 1.
Limiting structure is including seting up a plurality of perpendicular grooves 3 in center tube 1 outer fringe, erects the inslot 3 internal fixation and has a plurality of ratchets 4, offers on the 2 inner edges of driving sleeve and erects blind hole 5 that groove 3 corresponds, and it is provided with dog 26 to slide in the blind hole 5, and dog 26 is blockked by ratchet 4, and dog 26 passes through spring 6 with the hole bottom of blind hole 5 to be connected, a plurality of perpendicular grooves 3 set up according to the axle center circumference equipartition of center tube 1, and a plurality of ratchets 4 set up along the length direction equipartition of perpendicular groove 3.
When setting, the bridge plug is put into the well and adjusted to a target position, after the anchoring device is started, the driving sleeve 2 drives the sliding sleeve 7 to move downwards, the stop block 26 intermittently moves towards the blind hole 5 under the action of the ratchet 4, the spring 6 is intermittently compressed, the matching of the ratchet 4 and the stop block 26 can prevent the driving sleeve 2 from moving upwards, when the driving sleeve 2 enables the sliding sleeve 7 to move downwards, the sliding sleeve 7 drives the movable ring 12 to move downwards through the ejector rod 20 and the inner ring 14, therefore, when the sliding sleeve 7 moves downwards, under the blocking action of the fixed ring 9 and the squeezing action of the movable ring 12, the lower end of the upper conical sleeve 8 and the upper end of the lower conical sleeve 11 expand towards the outside of the central tube 1, simultaneously, the upper elastic rubber sleeve 15 and the lower elastic rubber sleeve 15 expand, the tube wall is tightly abutted to realize setting, after the setting is finished, the sealing plate 19 below the sliding sleeve 7 and the inner ring 14 is separated from the central tube 1, the upper, meanwhile, two communicating holes 24 on the mandril 20 are communicated with two inclined holes 23 on one side of the mandril 20, and the outlet ends of the upper communicating hole 24 and the lower communicating hole 24 respectively face the fixed ring 9 and the movable ring 12.
When deblocking is needed, a ball is thrown into the central tube 1, so that the ball body seals the ball seat 17, a dissolving liquid is injected into the central tube 1, the dissolving liquid enters the positions among the upper taper sleeve 8, the central tube 1, the sliding sleeve 7 and the fixing ring 9 through the upper liquid outlet 25, the dissolving liquid is mixed with dissolution promoting particles among the upper taper sleeve 8, the central tube 1, the sliding sleeve 7 and the fixing ring 9 and the upper dissolution promoting ring 10, so that the dissolution of the upper taper sleeve 8, the central tube 1, the sliding sleeve 7 and the fixing ring 9 can be accelerated, the dissolving liquid enters the positions among the lower taper sleeve 11, the movable ring 12, the inner ring 14, the bottom ring 16 and the central tube 1 through the lower liquid outlet 18 and the mixing 13 of the dissolution promoting particles among the lower taper sleeve 11, the movable ring 12, the inner ring 14, the bottom ring 16 and the central tube 1, so that the dissolution of the lower taper sleeve 11, the movable ring 12, the inner ring 14, the bottom ring 16 and the central tube 1 can be accelerated, the solution is sprayed through the open holes 22, the two inclined holes 23 and the two communication holes 24, the solution sprayed from the upper communication hole 24 can wash the fixed ring 9 and the upper taper sleeve 8, and the solution sprayed from the lower communication hole 24 can wash the movable ring 12 and the lower taper sleeve 11, so that the dissolving speed of the fixed ring 9, the upper taper sleeve 8 of the movable ring 12 and the lower taper sleeve 11 is increased, and the unsealing can be quickly realized. The invention has simple structure and low manufacturing cost, can realize setting after the expansion of the upper taper sleeve 8 and the lower taper sleeve 11 only by arranging a limit structure, has good anchoring effect after setting, can ensure the setting effect, can improve the welding speed of the solution to each part by arranging the dissolution promoting particles, the upper dissolution promoting ring 10 and the lower dissolution promoting ring 13, and can improve the dissolution speed of the solution by impacting the fixed ring 9, the movable ring 12, the upper taper sleeve 8 and the lower taper sleeve 11 by arranging the open holes 22, the inclined holes 23 and the communication holes 24, thereby being capable of quickly dissolving during deblocking and further improving the construction efficiency.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A bridge plug for an oil field is made of a soluble material and comprises a central tube and is characterized in that a driving sleeve is sleeved on the central tube, the driving sleeve is connected with the central tube through a limiting structure, a sliding sleeve is sleeved on the central tube below the driving sleeve in a sliding manner, an upper taper sleeve is fixed at the lower end of the sliding sleeve, a fixing ring is fixed on the central tube in the upper taper sleeve, the outer edge of the fixing ring is in sliding contact with the inner edge of the upper taper sleeve, a bottom ring is fixed on the central tube below the upper taper sleeve, a lower taper sleeve is fixed at the upper end of the bottom ring, the upper taper sleeve and the lower taper sleeve are symmetrically arranged from top to bottom, an inner ring is arranged in the central tube in the lower taper sleeve in a sliding manner, a movable ring is fixed at the outer side of the inner ring, the outer edge of the movable ring is in sliding contact with the inner edge of the lower taper sleeve, a mandril, the upper liquid outlet hole and the mandril are arranged in a staggered manner, a plurality of lower liquid outlet holes are formed in the central tube below the inner ring, a sealing plate for plugging the upper liquid outlet hole and the lower liquid outlet holes is fixed on the outer edge of the central tube, the sealing plate is fixedly connected with the central tube through shear pins, a plurality of open holes are formed in the inner side of the central tube between the fixing ring and the inner ring and correspond to the mandril, two inclined holes which are symmetrically arranged up and down are formed in the central tube outside the open holes and communicated with the open holes, the end parts of the upper inclined hole and the lower inclined hole which face the outer side of the central tube are mutually far away, the two inclined holes on one side of the central tube are plugged by the mandril, two communicating holes are formed in the mandril, the end parts of the two communicating holes on the mandril which face the outer side of the central tube are mutually far away, the lower end of the movable ring is fixedly embedded with a lower dissolution promoting ring, and the inner wall of the central tube is coated with a dissolution preventing coating.
2. The bridge plug for the oil field according to claim 1, wherein the limiting structure comprises a plurality of vertical grooves formed in the outer edge of the central tube, a plurality of ratchets are fixed in the vertical grooves, blind holes corresponding to the vertical grooves are formed in the inner edge of the driving sleeve, stop blocks are slidably arranged in the blind holes and are blocked by the ratchets, and the stop blocks are connected with the bottoms of the blind holes through springs.
3. The bridge plug of claim 2, wherein the vertical slots are evenly distributed along the circumference of the axis of the central tube, and the ratchet teeth are evenly distributed along the length of the vertical slots.
4. The oilfield bridge plug of claim 1, wherein the upper end of the upper drogue has a smaller diameter than the lower end.
5. The bridge plug for the oil field according to claim 1, wherein the lower end of the upper taper sleeve and the upper end of the lower taper sleeve are both fixed with elastic rubber envelopes.
6. The oilfield bridge plug of claim 1, wherein the plurality of grooves are evenly distributed according to a circumference of an axial center of the base pipe.
7. The oilfield bridge plug of claim 1, wherein the upper and lower dissolution promotion rings are compression molded from a dissolution promotion agent.
8. The bridge plug for the oil field according to claim 1, wherein dissolution promoting particles are placed in a space between the upper taper sleeve, the central pipe, the sliding sleeve and the fixing ring, and dissolution promoting particles are placed in a space between the lower taper sleeve, the movable ring, the inner ring, the bottom ring and the central pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110393145.2A CN113047807B (en) | 2021-04-13 | 2021-04-13 | Bridge plug for oil field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110393145.2A CN113047807B (en) | 2021-04-13 | 2021-04-13 | Bridge plug for oil field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113047807A true CN113047807A (en) | 2021-06-29 |
| CN113047807B CN113047807B (en) | 2022-12-13 |
Family
ID=76519459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110393145.2A Active CN113047807B (en) | 2021-04-13 | 2021-04-13 | Bridge plug for oil field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113047807B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117266776A (en) * | 2023-11-14 | 2023-12-22 | 东营市恒信机械有限责任公司 | Hydraulic bidirectional expansion shaping device for underground casing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050178549A1 (en) * | 2004-02-18 | 2005-08-18 | Eoff Larry S. | Methods of reducing the permeabilities of horizontal well bore sections |
| CN103147714A (en) * | 2013-03-05 | 2013-06-12 | 中国海洋石油总公司 | Annulus safety device applied to electric submersible pump producing well |
| CN105927521A (en) * | 2016-06-03 | 2016-09-07 | 濮阳市元亨利通石油机械有限公司 | Specific oil well pump for horizontal well |
| CN108505970A (en) * | 2012-03-07 | 2018-09-07 | 哈里伯顿制造服务有限公司 | Underground equipment and flow control method |
| CN111219163A (en) * | 2020-01-08 | 2020-06-02 | 王成军 | Bridge plug for oil field |
| CN111764865A (en) * | 2020-08-07 | 2020-10-13 | 深圳百途石油技术服务有限公司 | Soluble end cap of pump sending |
-
2021
- 2021-04-13 CN CN202110393145.2A patent/CN113047807B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050178549A1 (en) * | 2004-02-18 | 2005-08-18 | Eoff Larry S. | Methods of reducing the permeabilities of horizontal well bore sections |
| CN108505970A (en) * | 2012-03-07 | 2018-09-07 | 哈里伯顿制造服务有限公司 | Underground equipment and flow control method |
| CN103147714A (en) * | 2013-03-05 | 2013-06-12 | 中国海洋石油总公司 | Annulus safety device applied to electric submersible pump producing well |
| CN105927521A (en) * | 2016-06-03 | 2016-09-07 | 濮阳市元亨利通石油机械有限公司 | Specific oil well pump for horizontal well |
| CN111219163A (en) * | 2020-01-08 | 2020-06-02 | 王成军 | Bridge plug for oil field |
| CN111764865A (en) * | 2020-08-07 | 2020-10-13 | 深圳百途石油技术服务有限公司 | Soluble end cap of pump sending |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117266776A (en) * | 2023-11-14 | 2023-12-22 | 东营市恒信机械有限责任公司 | Hydraulic bidirectional expansion shaping device for underground casing |
| CN117266776B (en) * | 2023-11-14 | 2024-01-30 | 东营市恒信机械有限责任公司 | Hydraulic bidirectional expansion shaping device for underground casing |
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| Publication number | Publication date |
|---|---|
| CN113047807B (en) | 2022-12-13 |
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