CN109057739A - A kind of pilot-operated type underground fishing tool - Google Patents
A kind of pilot-operated type underground fishing tool Download PDFInfo
- Publication number
- CN109057739A CN109057739A CN201811055525.XA CN201811055525A CN109057739A CN 109057739 A CN109057739 A CN 109057739A CN 201811055525 A CN201811055525 A CN 201811055525A CN 109057739 A CN109057739 A CN 109057739A
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- China
- Prior art keywords
- slips
- fish
- mandrel
- shell
- connector
- 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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- 241000251468 Actinopterygii Species 0.000 claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 244000258271 Galium odoratum Species 0.000 claims abstract description 6
- 235000008526 Galium odoratum Nutrition 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000005553 drilling Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 239000011324 bead Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
Landscapes
- 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)
Abstract
The invention discloses a kind of pilot-operated type underground fishing tools, mainly it is made of connector, sealing ring, sliding sleeve, fixed pin, piston, shell, steel ball, slips, mandrel, screw, reset spring, stroke pin, pin spring, woodruff key, it is characterized in that when carrying out fishing, fishing tool is connected to down-hole string lowest part, each screw thread is tightened, tool is gone into the well.When downward putting device is away from fish top 1-2m, stop decentralization, records the total weight hung at this time.It is then turned on slush pump, rinses fish, after rinsing fish well, closes slush pump, continues slowly decentralization fishing tool.When suspending weight returns drop, stop decentralization, and attempt above to mention drill string, after confirming engagement with the fish, above mentions device, take out fish.If salvaging fish meets card, tool tubular column is transferred, when weight indicator returns and is reduced to suspending weight, stops decentralization, opens slush pump 10 seconds or so, then upper lifting pipe post, can exit fish for tool.
Description
Technical field
The present invention relates to a kind of fishing tool, especially a kind of pilot-operated type underground fishing tool belongs to petroleum works or machine
Tool field of engineering technology.
Background technique
Currently, the exploitation of many oil/gas wells in China has all entered middle and later periods, Masaru Ibuka and subsurface environment complexity, down-hole accident
Also increase year by year, wherein the most outstanding is falling for downhole tool or tubing string.If handled not in time, it can not only delay work
Phase also will cause scrapping for oil/gas well when serious, bring huge economic loss.And handle downhole tool or tubing string is fallen most often
Method is to carry out fishing using fishing tool.
Fishing tool used by the country is mostly that slips can move back fishing tool, and more valve slips by being equipped with back-off, which are bitten, to be fallen
Fish takes out fish from shaft bottom.If meet card cannot normally take out fish, generally by rotary drill column or lift from the top and put down drill string come
It realizes fishing tool from exiting in fish.But both modes have its defect: being exited by way of rotary drill column
Fishing tool task difficulty in horizontal well is big, is not easy rotary drill column, and rotate the bad control of angle；Using lifting from the top and puting down drill string
Mode complete exiting for fishing tool, if during salvaging meet card, need to lift from the top and put down drill string unfreezing, then cannot be fine
Realization, be easy to cause fish to fall off, salvage failure.Therefore, developing a kind of fishing tool that can be tried out in various hole conditions has
Significance.
Summary of the invention
It is an object of the invention in order to overcome above-mentioned difficult point, spy proposes a kind of pilot-operated type underground fishing tool, for not
Salvaging when there is accident with well type to fish.
In order to achieve the above objectives, the present invention solve this technical problem the technical solution adopted is that:
A kind of pilot-operated type underground fishing tool, mainly by connector, sealing ring, sliding sleeve, fixed pin, piston, shell, steel ball,
Slips, mandrel, screw, reset spring, stroke pin, pin spring, woodruff key composition, it is characterised in that: the connector and core
Axis is connected through a screw thread, and connector is equipped with the pin hole of installation fixed pin and pin spring；The piston is mounted in connector, thereon
End is equipped with the annular groove cooperated with fixed pin, and annular groove two sides are equipped with inclined-plane, stroke groove are equipped in the middle part of the piston, for controlling
The stroke of piston；The fixed pin is mounted in the pin hole of connector, and the other end is plugged in the annular groove of piston；The casing
On connector, and shell is limited by woodruff key and being circumferentially rotated, the shell be equipped with annular distance, steel bead groove, screw hole and
The quantity of keyway, annular distance is for two and symmetrical along the circumferential direction of shell；The reset spring is sleeved on piston, and the upper end is made
With on the step of piston, lower end acts on the upper end of mandrel；The slips is equipped with arc groove, cannelure, back-off and conical cavity,
Cannelure quantity is four and being arranged circumferentially along slips；The steel ball is mounted on shell and slips cooperation is formed by circle
In slot；The slips is assemblied on mandrel, and by steel ball and cage connection, and shell and component composed by slips can be along connecing
Head and mandrel axial movement；The mandrel lower end is cone, for strutting slips, can bite fish；It is being beaten
When fishing out operation, according to the specification of fishing tool described in fish hydrophthalmia size selection, and the outer diameter of slips should be than fish hydrophthalmia size
Big 1-3mm；When carrying out fishing, the fishing tool is connected to underground drill stem lowest part, transfers drill string, when salvaging work
When tool enters fish hydrophthalmia, since slips size is greater than fish hydrophthalmia size, then slips can resist stopping by fish and move down,
Connector and mandrel continue to move downward at this time；When slips, shell and sliding sleeve are resisted by connector, continue to transfer fishing tool, card
Watt it can be compressed into fish inner cavity, slips can generate radial force and bite fish；Then the fishing tool is above mentioned, due to blocking at this time
Watt bite fish, then shell and the slips being connect by steel ball with it opposite mandrel under the drag effect of fish move downward,
To which the conical cavity of slips and the conical surface contact of mandrel lower end above mention drill string so that slips struts and further sting tight fish
Fish can be taken out；It can not normally be taken out if fish is too tight by card in underground, transfer fishing tool, slips is stung at this time
Firmly fish and can not move down, and connector and mandrel move down under drill string effect, so that the tapered surface and slips of mandrel
Conical cavity separation；When slips, shell and sliding sleeve are resisted by connector, then drilling pump is opened, drilling fluid pushes piston downward
Mobile, fixed pin is extruded and is inserted into the annular distance of shell from the annular groove of piston；During piston moves down, stroke
Pin is moved up relative to stroke groove, when stroke pin reaches at the top of stroke groove, can be caught in the corner of stroke groove；Termination of pumping
Afterwards, under the action of stroke pin, piston can not be restored to initial position, so that fixed pin can not bounce back to stablize it
In annular distance, shell and slips are fixed with connector at this time, and the conical cavity of the tapered surface of mandrel and slips is still in discrete state；On
Fishing tool is mentioned, since the tapered surface of mandrel and the conical cavity of slips do not generate interaction, the active force between slips and fish
It is derived only from the radial force that slips is generated by contraction, but since fish is stuck, the fishing tool is remained to from well
Take out and fish can not then take out.
Compared with prior art, the present invention having the advantage, that (1) control of the invention by the way of start-stop drilling mud pump
Fishing tool processed is too tight by card even if fish and when can not take out can take out fishing tool from exiting in fish；(2) originally
Invention can steadily bite fish during upper mention, prevent fish from falling by the swelling mode of tapered surface and conical cavity cooperation,
And when fish can not tightly be taken out very much by card, piston can be locked by the cooperation of stroke pin and stroke groove, so that described beat
Fishing combined tool is free to advance or retreat.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of pilot-operated type underground fishing tool of the present invention；
Fig. 2 is the A-A diagrammatic cross-section in Fig. 1；
Fig. 3 is the structural schematic diagram of fixed pin in a kind of pilot-operated type underground fishing tool of the present invention；
Fig. 4 is the structural schematic diagram of piston in a kind of pilot-operated type underground fishing tool of the present invention；
Fig. 5 is the structural schematic diagram of shell in a kind of pilot-operated type underground fishing tool of the present invention；
Fig. 6 is another structural schematic diagram of shell in a kind of pilot-operated type underground fishing tool of the present invention；
Fig. 7 is the structural schematic diagram of slips in a kind of pilot-operated type underground fishing tool of the present invention；
In figure: 1. connectors, 2. sealing rings, 3. sliding sleeves, 4. fixed pins, 5. pistons, 5a. annular groove, 5b. stroke groove, 6. shells,
6a. annular distance, 6b. steel bead groove, 6c. screw hole, 6d. keyway, 7. steel balls, 8. slips, 8a. arc groove, 8b. cannelure, 8c. back-off,
8d. conical cavity, 9. mandrels, 10. screws, 11. reset springs, 12. stroke pins, 13. pin springs, 14. woodruff keies.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
Case study on implementation one:
As shown in Fig. 1-Fig. 7, a kind of pilot-operated type underground fishing tool, mainly by connector 1, sealing ring 2, sliding sleeve 3, fixed pin
4, piston 5, shell 6, steel ball 7, slips 8, mandrel 9, screw 10, reset spring 11, stroke pin 12, pin spring 13, semicircle
Key 14 forms, it is characterised in that: the connector 1 is connected through a screw thread with mandrel 9, and connector 1 is equipped with installation fixed pin 4 and pin
The pin hole of spring 13；The piston 5 is mounted in connector 1, and the upper end is equipped with the annular groove 5a cooperated with fixed pin 4, and annular groove
Two sides are equipped with inclined-plane, stroke groove 5b are equipped in the middle part of the piston 5, for controlling the stroke of piston 5；The fixed pin 4 is mounted on
In the pin hole of connector 1, the other end is plugged in the annular groove 5a of piston 5；The shell 6 is sleeved on connector 1, and passes through semicircle
Key 14 limits circumferentially rotating for shell 6, and the shell 6 is equipped with annular distance 6a, steel bead groove 6b, screw hole 6c and keyway 6d, annular distance
The quantity of 6a is for two and symmetrical along the circumferential direction of shell 6；The reset spring 11 is sleeved on piston 5, the upper end effect
On the step of piston 5, lower end acts on the upper end of mandrel 9；The slips 8 be equipped with arc groove 8a, cannelure 8b, back-off 8c and
Conical cavity 8d, cannelure 8b quantity are four and being arranged circumferentially along slips 8；The steel ball 7 is mounted on shell 6 and slips 8
Cooperation is formed by circular trough；The slips 8 is assemblied on mandrel 9, and is connect by steel ball 7 with shell 6, shell 6 and card
Component composed by watts 8 can be moved axially along connector 1 and mandrel 9；9 lower end of mandrel is cone, for strutting slips
8, fish can be bitten；When carrying out fishing, according to the specification of fishing tool described in fish hydrophthalmia size selection, and
The outer diameter of slips 8 should be 1-3mm bigger than fish hydrophthalmia size；When carrying out fishing, the fishing tool is connected to underground
Drill string lowest part transfers drill string, when fishing tool enters fish hydrophthalmia, since 8 size of slips is greater than fish hydrophthalmia size, then
Slips 8 can resist stopping by fish and move down, and connector 1 and mandrel 9 continue to move downward at this time；When slips 8, shell 6 and slide
When set 3 is resisted by connector 1, continue to transfer fishing tool, slips 8 can be compressed into fish inner cavity, and slips 8 can generate radial force and sting
Firmly fish；Then the fishing tool is above mentioned, since slips 8 bites fish at this time, then shell 6 and is connect with it by steel ball 7
Slips 8 under the drag effect of fish opposite mandrel move downward, thus the circle of the conical cavity 8d of slips 8 and 9 lower end of mandrel
Taper-face contact, so that slips 8 struts and further stings tight fish, fish can be taken out by above mentioning drill string；If fish is in underground
It tightly can not normally be taken out very much by card, then transfer fishing tool, slips 8 is bitten fish and can not be moved down at this time, and connector 1
It is moved down under drill string effect with mandrel 9, so that the tapered surface of mandrel 9 is separated with the conical cavity 8d of slips 8；When slips 8, outside
When shell 6 and sliding sleeve 3 are resisted by connector 1, then drilling pump is opened, drilling fluid pushes piston 5 to move down, and fixed pin 4 is from piston 5
Annular groove 5a in be extruded and be inserted into the annular distance 6a of shell 6；During piston 5 moves down, stroke pin 12 is opposite
It is moved up in stroke groove 5b, when stroke pin 12 reaches at the top of stroke groove 5b, the corner of stroke groove 5b can be caught in；Termination of pumping
Afterwards, under the action of stroke pin 12, piston 5 can not be restored to initial position, so that fixed pin 4 can not bounce back to keep it steady
It is scheduled in annular distance 6a, shell 6 and slips 8 and connector 1 are fixed at this time, and the tapered surface of mandrel 9 and the conical cavity 8d of slips 8 still locate
In discrete state；Fishing tool is above mentioned, since the tapered surface of mandrel 9 and the conical cavity 8d of slips 8 do not generate interaction, slips
Active force between 8 and fish is derived only from the radial force that slips 8 is generated by contraction, but since fish is stuck, described
Fishing tool remains to take out from well and fish can not then take out.
Case study on implementation two:
When fishing, fishing tool is connected to down-hole string lowest part, each screw thread is tightened, tool is gone into the well.Under
When putting device away from fish top 1-2m, stop decentralization, records the total weight hung at this time.It is then turned on slush pump, rinses fish,
After rinsing fish well, slush pump is closed, continues slowly decentralization fishing tool.When suspending weight returns drop, stop decentralization, and taste
Drill string is mentioned in examination, after confirming engagement with the fish, is above mentioned device, is taken out fish.If salvaging fish meets card, tool pipe is transferred
Column stops transferring, unlatching slush pump 10 seconds or so, then upper lifting pipe post when weight indicator returns and is reduced to suspending weight, can be by tool
Exit fish.
Specific embodiment described above is used for the range illustrated the present invention without limiting the present invention, the skill of any this field
Art personnel equivalent changes and modifications made under the premise of not departing from conceptions and principles of the invention, belong to present system
Protection scope.
Claims (1)
1. a kind of pilot-operated type underground fishing tool, mainly by connector (1), sealing ring (2), sliding sleeve (3), fixed pin (4), piston
(5), shell (6), steel ball (7), slips (8), mandrel (9), screw (10), reset spring (11), stroke pin (12), pin bullet
Spring (13), woodruff key (14) composition, it is characterised in that: the connector (1) is connected through a screw thread with mandrel (9), and connector is set on (1)
There is the pin hole of installation fixed pin (4) and pin spring (13)；The piston (5) is mounted in connector (1), and the upper end is equipped with and consolidates
The annular groove (5a) of rationed marketing (4) cooperation, and annular groove two sides are equipped with inclined-plane, are equipped with stroke groove (5b) in the middle part of the piston (5), are used for
Control the stroke of piston (5)；The fixed pin (4) is mounted in the pin hole of connector (1), and the other end is plugged on piston (5)
In annular groove (5a)；The shell (6) is sleeved on connector (1), and circumferentially rotating by woodruff key (14) limitation shell (6),
The shell (6) is equipped with annular distance (6a), steel bead groove (6b), screw hole (6c) and keyway (6d), and the quantity of annular distance (6a) is two
It is a and symmetrical along the circumferential direction of shell (6)；The reset spring (11) is sleeved on piston (5), and the upper end acts on piston
(5) on step, lower end acts on the upper end of mandrel (9)；The slips (8) is equipped with arc groove (8a), cannelure (8b), back-off
(8c) and conical cavity (8d), cannelure (8b) quantity are four and being arranged circumferentially along slips (8)；Steel ball (7) installation
In shell (6) and slips (8), cooperation is formed by circular trough；The slips (8) is assemblied on mandrel (9), and passes through steel ball
(7) it is connect with shell (6), component composed by shell (6) and slips (8) can be moved axially along connector (1) and mandrel (9)；
Mandrel (9) lower end is cone, for strutting slips (8), can bite fish；When carrying out fishing, root
It should be 1-3mm bigger than fish hydrophthalmia size according to the outer diameter of the specification of fishing tool described in fish hydrophthalmia size selection, and slips (8)；
When carrying out fishing, the fishing tool is connected to underground drill stem lowest part, transfers drill string, fallen when fishing tool enters
At the moment, since slips (8) size is greater than fish hydrophthalmia size, then slips (8) can resist stopping by fish and move down fish and water, this
When connector (1) and mandrel (9) continue to move downward；When slips (8), shell (6) and sliding sleeve (3) are resisted by connector (1), continue
Fishing tool is transferred, slips (8) can be compressed into fish inner cavity, and slips (8) can generate radial force and bite fish；Then institute is above mentioned
Fishing tool is stated, since slips (8) bites fish at this time, then shell (6) and the slips (8) connecting with it by steel ball (7) exist
The lower opposite mandrel of the drag effect of fish moves downward, thus the circular conical surface of the conical cavity (8d) of slips (8) and mandrel (9) lower end
Contact, so that slips (8) struts and further stings tight fish, fish can be taken out by above mentioning drill string；If fish is in underground quilt
Card is too tight and can not normally take out, then transfers fishing tool, slips (8) is bitten fish and can not be moved down at this time, and connector
(1) it is moved down under drill string effect with mandrel (9), so that the tapered surface of mandrel (9) and the conical cavity (8d) of slips (8) point
From；When slips (8), shell (6) and sliding sleeve (3) are resisted by connector (1), then drilling pump is opened, drilling fluid pushes piston (5)
It moves down, fixed pin (4) is extruded from the annular groove (5a) of piston (5) and is inserted into the annular distance (6a) of shell (6)；In piston
(5) during moving down, stroke pin (12) is moved up relative to stroke groove (5b), is gone when stroke pin (12) reach
When at the top of journey slot (5b), the corner of stroke groove (5b) can be caught in；After termination of pumping, under the action of stroke pin (12), piston (5)
It can not be restored to initial position, so that fixed pin (4) can not bounce back to stablize it in the annular distance (6a), shell (6) at this time
It is fixed with slips (8) and connector (1), and the tapered surface of mandrel (9) and the conical cavity (8d) of slips (8) are still in discrete state；
Above mention fishing tool, since the tapered surface of mandrel (9) and the conical cavity (8d) of slips (8) do not generate interaction, slips (8) and
Active force between fish is derived only from the radial force that slips (8) is generated by contraction, but since fish is stuck, described to beat
Fishing combined tool remains to take out from well and fish can not then take out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811055525.XA CN109057739B (en) | 2018-09-11 | 2018-09-11 | Hydraulic control type underground fishing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811055525.XA CN109057739B (en) | 2018-09-11 | 2018-09-11 | Hydraulic control type underground fishing tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109057739A true CN109057739A (en) | 2018-12-21 |
| CN109057739B CN109057739B (en) | 2022-06-21 |
Family
ID=64761242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811055525.XA Active CN109057739B (en) | 2018-09-11 | 2018-09-11 | Hydraulic control type underground fishing tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109057739B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723400A (en) * | 2018-12-27 | 2019-05-07 | 贵州航天凯山石油仪器有限公司 | A kind of downhole instrument salvaging structure |
| CN114562228A (en) * | 2022-03-08 | 2022-05-31 | 西南石油大学 | Drilling accident treatment device for improving well integrity |
| CN114687689A (en) * | 2022-04-21 | 2022-07-01 | 西南石油大学 | Recoverable bridging plug dropping tool |
| CN114687698A (en) * | 2022-04-21 | 2022-07-01 | 西南石油大学 | Retrievable bridge plug releasing fishing tool |
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| RU2182217C1 (en) * | 2001-03-11 | 2002-05-10 | Общество С Ограниченной Ответственностью Научно-Производственное Предприятие "Буринтех" | Releasing mechanical spear |
| US20110030955A1 (en) * | 2009-08-06 | 2011-02-10 | Braddick Britt O | Hydraulically Powered Fishing Tool and Method |
| CN201778716U (en) * | 2010-08-05 | 2011-03-30 | 大港油田集团有限责任公司 | Sealed spear |
| CN202249882U (en) * | 2011-09-20 | 2012-05-30 | 中国石油天然气集团公司 | Hydraulic returnable slip overshot |
| CN203515431U (en) * | 2013-11-19 | 2014-04-02 | 通化市前进石油机械有限公司 | Withdrawable fishing spear |
| CN205823221U (en) * | 2016-07-08 | 2016-12-21 | 西南石油大学 | One is novel drags for lance |
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2018
- 2018-09-11 CN CN201811055525.XA patent/CN109057739B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2182217C1 (en) * | 2001-03-11 | 2002-05-10 | Общество С Ограниченной Ответственностью Научно-Производственное Предприятие "Буринтех" | Releasing mechanical spear |
| US20110030955A1 (en) * | 2009-08-06 | 2011-02-10 | Braddick Britt O | Hydraulically Powered Fishing Tool and Method |
| CN201778716U (en) * | 2010-08-05 | 2011-03-30 | 大港油田集团有限责任公司 | Sealed spear |
| CN202249882U (en) * | 2011-09-20 | 2012-05-30 | 中国石油天然气集团公司 | Hydraulic returnable slip overshot |
| CN203515431U (en) * | 2013-11-19 | 2014-04-02 | 通化市前进石油机械有限公司 | Withdrawable fishing spear |
| CN205823221U (en) * | 2016-07-08 | 2016-12-21 | 西南石油大学 | One is novel drags for lance |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723400A (en) * | 2018-12-27 | 2019-05-07 | 贵州航天凯山石油仪器有限公司 | A kind of downhole instrument salvaging structure |
| CN114562228A (en) * | 2022-03-08 | 2022-05-31 | 西南石油大学 | Drilling accident treatment device for improving well integrity |
| CN114562228B (en) * | 2022-03-08 | 2023-06-02 | 西南石油大学 | Drilling accident handling device for improving well integrity |
| CN114687689A (en) * | 2022-04-21 | 2022-07-01 | 西南石油大学 | Recoverable bridging plug dropping tool |
| CN114687698A (en) * | 2022-04-21 | 2022-07-01 | 西南石油大学 | Retrievable bridge plug releasing fishing tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109057739B (en) | 2022-06-21 |
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