CN112943143B - Hydraulic salvaging pipe column and salvaging method for coiled tubing of downhole choke - Google Patents
Hydraulic salvaging pipe column and salvaging method for coiled tubing of downhole choke Download PDFInfo
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- CN112943143B CN112943143B CN202110034697.4A CN202110034697A CN112943143B CN 112943143 B CN112943143 B CN 112943143B CN 202110034697 A CN202110034697 A CN 202110034697A CN 112943143 B CN112943143 B CN 112943143B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 241000935974 Paralichthys dentatus Species 0.000 claims description 19
- 238000004873 anchoring Methods 0.000 claims description 7
- 210000000078 claw Anatomy 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 6
- 241000251468 Actinopterygii Species 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 description 11
- 230000000694 effects Effects 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- 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
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- 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 invention provides a coiled tubing hydraulic fishing string of an underground throttler and a fishing method. According to the invention, the matched hydraulic casing anchor can prevent the fishing neck of the restrictor from being broken by the excessive reaction force of the fishing tool, and the hydraulic casing anchor is anchored on the inner wall of the production pipe column to bear the upward reaction force of the outer cylinder of the fishing tool while the fishing tool is pushed to push the vertical rod by the suppressed pressure hydraulic pressure. The invention can realize the unsealing and salvaging of the throttleer at the same time in one operation. The fishing neck of the throttle is caught by a hydraulic fishing tool, the throttle is prevented from going down together, then the throttle is unsealed by pushing a central rod of the throttle through hydraulic pressure, and the throttle is fished up. Provides a new fishing method for fishing wells of some difficult throttlers.
Description
Technical Field
The invention belongs to the technical field of oil field production downhole operation, and particularly relates to a coiled tubing hydraulic salvage pipe column and a salvage method for an underground throttler.
Background
At present, the throttleers used in oil fields are multiple in manufacturers and types, and fishing tools and methods are also various. Due to the influences of factors such as the type of the throttleer, the time for putting the throttleer in, the underground corrosion environment, the sand outlet of an environmental barrel, scaling, the material of the throttleer and the like, the fishing success rate of the throttleer is not high, and some throttleers cannot be fished for a long time. The traditional fishing methods such as hammering method or shock method, etc. are not suitable for some throttlers with scaling, stuck and the like.
Disclosure of Invention
The invention aims to provide a coiled tubing hydraulic fishing string of an underground choke, which overcomes the technical problems in the prior art.
The invention also aims to provide a fishing method for the underground throttle, which can prevent the fishing neck of the underground throttle from being broken due to overlarge pulling force.
Therefore, the technical scheme provided by the invention is as follows:
a coiled tubing hydraulic fishing string of an underground throttler comprises a coiled tubing, a hydraulic casing anchor and a hydraulic fishing tool which are sequentially connected from top to bottom.
And a check valve is arranged between the hydraulic casing anchor and the coiled tubing.
The hydraulic fishing tool comprises a hydraulic mechanism and a fishing mechanism which are sequentially connected from top to bottom, and the hydraulic mechanism and the fishing mechanism are connected through a connecting seat.
The hydraulic casing anchor comprises an upper connector I, a connecting sleeve, an anchor body and a lower connector which are sequentially connected, wherein a locking ring is arranged in the connecting sleeve, the locking ring is fixedly connected with the connecting sleeve through a locking shear pin, a central pipe is arranged in the anchor body and fixed with the central pipe through a safety shear pin, a locking ring is sleeved at the upper end of the central pipe, an anchor claw is fixedly arranged on the anchor body, and a piston I is fixedly arranged at the lower part of the central pipe.
The hydraulic mechanism comprises a second upper joint and an outer barrel which are sequentially connected from top to bottom, a second piston and a push rod are arranged in the outer barrel, and the second piston is arranged above the push rod;
salvage mechanism includes spacer sleeve, fixed cover, dabber, jack catch and locking cover, the spacer sleeve passes through the connecting seat with the urceolus and is connected, fixed cover and dabber are all located in the spacer sleeve, fixed cover inboard is located to the dabber, be equipped with the spring between dabber and the spacer sleeve, the spring is compressed and is arranged in between fixed cover and the connecting seat, fixed cover is fixed through shearing pin with the dabber, fixed cover overcoat is equipped with the rectangle spring and is located the spacer sleeve below, the jack catch is connected with the dabber lower extreme and arranges the rectangle spring below in, leave the interval between jack catch top and the fixed cover, the jack catch inlays in the locking cover.
The clamping jaw is connected with the mandrel through a connecting block, a limiting step is arranged on the outer side of the lower end of the mandrel, the connecting block is arranged on the limiting step, a protrusion is arranged on the outer side of the connecting block, a round hole is formed in the upper end of the clamping jaw, and the protrusion of the connecting block is arranged in the round hole of the clamping jaw.
The utility model provides a method for salvaging downhole choke ware, adopt downhole choke ware coiled tubing hydraulic pressure to salvage the tubular column, transfer downhole choke ware coiled tubing hydraulic pressure and salvage the tubular column, hydraulic fishing tool grasps the salvage neck of choke ware, then coiled tubing suppresses pressure, the fluke of hydraulic pressure casing anchor stretches out and meshes with the sleeve pipe inner wall, the push-rod of hydraulic fishing tool pushes away the well core rod of choke ware under the hydraulic pressure effect simultaneously, make the choke ware deblocking, after the choke ware deblocking, coiled tubing pressure release, the fluke of hydraulic pressure casing anchor is withdrawed, lift the tubular column and salvage the choke ware.
Through the pressure build-up of the continuous oil pipe, a piston I of the hydraulic casing anchor and an anchor body form a sealed cavity, a lower pushing force is generated to cut off the safety shear pin to push the central pipe to move downwards in the anchor body, and the conical surface of the central pipe and the inclined surface of the fluke generate relative motion to enable the fluke to extend out of the anchor body and be meshed with the inner wall of the casing to form anchoring.
The speed of lowering the coiled tubing of the downhole choke for hydraulically salvaging the pipe string is less than 600m/h.
The coiled tubing is held back to 30-35MPa.
The invention has the beneficial effects that:
according to the coiled tubing hydraulic salvaging tubular column of the underground choke, after the hydraulic salvaging tool grabs the choke, the pressure is suppressed through the coiled tubing, the salvaging tool mandrel is hydraulically pushed to push the choke main body downwards, and the choke is unsealed; through supporting hydraulic pressure casing anchor, can prevent that fishing tool reaction force from too big breaking the flow controller fishing neck, when suppressing pressure hydraulic pressure and promoting fishing tool and push away the pole setting, hydraulic pressure casing anchor anchoring bears fishing tool urceolus ascending reaction force at the production tubular column inner wall.
The invention provides a choke which can be unsealed and salvaged simultaneously through related tools matched with a coiled tubing in one operation. The fishing neck of the throttle is caught through a hydraulic fishing tool, the hydraulic fishing tool is prevented from going downwards together, then the hydraulic fishing tool pushes a central rod of the throttle to go downwards to realize throttle unsealing, and the hydraulic fishing tool is fished up. Provides a new fishing method for fishing wells of some difficult throttlers.
The following will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic illustration of a field implementation of the present invention;
FIG. 2 is a schematic diagram of one embodiment of a hydraulic casing anchor;
FIG. 3 is a schematic view of the lower structure of one embodiment of the hydraulic fishing tool.
In the figure: 1. a hydraulic casing anchor; 2. a hydraulic fishing tool; 3. a check valve; 4. a safety joint; 5. a restrictor; 6. fishing a neck; 7. a rubber cylinder; 8. pushing the push rod; 9. an upper joint I; 10. connecting sleeves; 11. unlocking the ring; 12. releasing the clipping and shearing nail; 13. a central tube; 14. a locking ring; 15. an anchor body; 16. safe nail shearing; 17. a screw; 18. a spring plate; 19. a fluke; 20. a first piston; 21. a seal ring; 22. a snap ring; 23. a lower joint; 24. a second piston; 25. an outer cylinder; 26. a connecting seat; 27. a spring; 28. a spacer sleeve; 29. fixing a sleeve; 30. a mandrel; 31. shearing the pin; 32. a rectangular spring; 33. connecting blocks; 34. a claw; 35. a locking sleeve.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Example embodiments of the present invention will now be described with reference to the accompanying drawings, however, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are provided for a complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same unit/element is denoted by the same reference numeral.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their context in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides a coiled tubing hydraulic fishing string of a downhole choke, which comprises a coiled tubing, a hydraulic casing anchor 1 and a hydraulic fishing tool 2 which are sequentially connected from top to bottom.
The use process comprises the following steps:
after connecting in proper order coiled tubing, hydraulic casing anchor 1 and hydraulic fishing tool 2, go into the well down, after reacing the 5 tops of choke holder, transfer fast, make hydraulic fishing tool 2 catch choke holder 5, then oil pipe suppress the pressure, push rod 8 of pushing hydraulic fishing tool 2 under the hydraulic pressure effect promotes the well core rod of choke holder 5 simultaneously, hydraulic casing anchor 1 anchoring is at the production string inner wall, bears fishing tool urceolus 25 reaction force upwards. After the throttler 5 is unsealed, the coiled tubing is decompressed, the fluke 19 of the hydraulic casing anchor 1 is withdrawn, and the throttler 5 can be fished out by lifting the pipe column.
Example 2:
on the basis of embodiment 1, the present embodiment provides a coiled tubing hydraulic fishing string for a downhole choke, and a check valve 3 is arranged between the hydraulic casing anchor 1 and the coiled tubing.
Through setting up check valve 3, when avoiding oil pipe to suppress pressure, liquid is palirrhea, can't provide sufficient hydraulic pressure with the push rod 8 of promoting hydraulic fishing tool 2 central rod that promotes flow controller 5 downwards, leads to the unable smooth deblocking of flow controller 5.
Example 3:
on the basis of embodiment 1, this embodiment provides a coiled tubing hydraulic fishing string for downhole choke, the hydraulic fishing tool 2 includes a hydraulic mechanism and a fishing mechanism that are connected in sequence from top to bottom, and the hydraulic mechanism and the fishing mechanism are connected through a connecting seat 26.
The hydraulic mechanism provides hydraulic pressure to unseal the choke 5, and the fishing mechanism is used for grabbing the choke 5.
Example 4:
on the basis of embodiment 1, the embodiment provides a coiled tubing hydraulic fishing string for a downhole choke, the hydraulic casing anchor 1 includes a first upper joint 9, a connecting sleeve 10, an anchor body 15 and a lower joint 23 which are connected in sequence, an unlocking ring 11 is arranged in the connecting sleeve 10, the unlocking ring 11 is fixedly connected with the connecting sleeve 10 through an unlocking shear pin 12, a central tube 13 is arranged in the anchor body 15 and is fixed by a safety shear pin 16, a locking ring 14 is sleeved on the upper end of the central tube 13, an anchor claw 19 is fixedly arranged on the anchor body 15, and a first piston 20 is fixedly arranged on the lower portion of the central tube 13.
As shown in fig. 2, the hydraulic casing anchor 1 includes a first upper joint 9, a connecting sleeve 10, a release ring 11, a release shear pin 12, a center tube 13, a locking ring 14, an anchor body 15, a safety shear pin 16, a fluke 19, a first piston 20, a snap ring 22 and a lower joint 23. Wherein, the upper joint I9 is connected with the connecting sleeve 10 through threads, and the lower joint 23 is connected with the anchor body 15 through threads. The unlocking ring 11 is arranged in the connecting sleeve 10 and fixed through the unlocking shear pin 12, the connecting sleeve 10 is connected with the anchor body 15 through threads, the central tube 13 is arranged in the anchor body 15 and fixed through the safety shear pin 16, the locking ring 14 is sleeved on the outer surface of the upper end of the central tube 13, the inner surface of the upper end hole of the central tube 13 is provided with sawtooth threads, and the tooth direction of the sawtooth threads is opposite to the sawtooth threads on the outer surface of the fishing claw. The fluke 19 is arranged on the anchor body 15 and fixed through the screw and the elastic sheet 18, and the piston I20 is arranged at the lower part of the central tube 13 and fixed on the central tube 13 through the clamping ring 22. The first piston 20 is provided with a sealing ring 21 inside and outside. The anchor is lowered with the tubing to a predetermined well depth.
When the safety shear pin is used in site construction, the pressure is suppressed through the oil pipe, and a downward pushing force is generated in a sealing cavity formed by the first piston 20 and the anchor body 15 to shear the safety shear pin 16 and push the central pipe 13 to move downwards in the anchor body 15; the conical surface of the central tube 13 and the inclined surface of the fluke 19 move relatively, so that the fluke 19 extends out of the anchor body 15 and is meshed with the inner wall of the sleeve to form anchoring; the lock ring 14 is jumped in the downward moving process of the central tube 13, so that unidirectional locking is realized, and the central tube 13 is prevented from retreating.
Example 5:
on the basis of embodiment 3, the present embodiment provides a coiled tubing hydraulic fishing string for a downhole choke, as shown in fig. 3, the hydraulic mechanism includes a second upper joint and an outer cylinder 25 which are sequentially connected from top to bottom, a second piston 24 and a push rod 8 are arranged in the outer cylinder 25, and the second piston 24 is arranged above the push rod 8;
fishing mechanism includes spacer sleeve 28, fixed cover 29, dabber 30, jack catch 34 and locking cover 35, spacer sleeve 28 passes through connecting seat 26 with urceolus 25 and is connected, fixed cover 29 and dabber 30 are all located in spacer sleeve 28, fixed cover 29 is inboard located to dabber 30, be equipped with spring 27 between dabber 30 and the spacer sleeve 28, spring 27 is compressed and is arranged in between fixed cover 29 and the connecting seat 26, fixed cover 29 is fixed through shearing pin 31 with dabber 30, fixed cover 29 overcoat is equipped with rectangle spring 32 and is located spacer sleeve 28 below, jack catch 34 is connected and arranges rectangle spring 32 below in with dabber 30 lower extreme, leave the interval between jack catch 34 top and the fixed cover 29, jack catch 34 inlays in locking cover 35.
After the tubular column is transferred and is arrived choke holder 5 top, transfer fast, contact choke holder 5 fishing neck 6 when jack catch 34, jack catch 34 receives the ascending thrust rebound of choke holder 5, can avoid damaging the instrument because of the impact force is too big through rectangular spring's 32 buffering, jack catch 34 and connecting block 33 move up together, no longer remove when fixed cover 29 is touch to connecting block 33, jack catch 34 receives the thrust on the top and blocks choke holder 5 fishing neck 6 this moment, the completion is snatched the action.
And then, the coiled tubing is pressed, the second piston 24 is pushed to move downwards, the ejector rod 8 is driven to move downwards, and the ejector rod 8 compresses the central rod of the restrictor 5 to force the rubber cylinder 7 of the restrictor 5 to be unsealed. Meanwhile, the hydraulic casing anchor 1 is anchored in the casing, overcomes the upward reaction force of the outer cylinder 25 of the hydraulic fishing tool 2, and prevents the fishing neck 6 of the restrictor 5 from being broken by the overlarge reaction force of the fishing tool. After the throttler 5 is unsealed, the coiled tubing is decompressed, the fluke 19 of the hydraulic casing anchor 1 is withdrawn, and the throttler 5 can be fished out by lifting the pipe column.
When the throttle 5 is failed to be unsealed, the shear pin 31 is disconnected by upward or downward jarring, the spring 27 is released, the spring 27 is larger than the rectangular spring 32, the fixing sleeve 29 moves downwards, the jar connecting block 33 forces the clamping jaw 34 to be separated from the locking sleeve 35, the clamping jaw 34 is opened, the fishing neck 6 of the throttle 5 is loosened, the fishing tool can be taken out at the moment, and the condition that the fishing pipe column cannot be taken out after the throttle 5 fails to be fished to influence subsequent operation is avoided.
Example 6:
on the basis of embodiment 5, the embodiment provides a coiled tubing hydraulic fishing string for a downhole choke holder, as shown in fig. 3, a jaw 34 is connected with a mandrel 30 through a connecting block 33, a limiting step is arranged on the outer side of the lower end of the mandrel 30, the connecting block 33 is arranged on the limiting step, a protrusion is arranged on the outer side of the connecting block 33, a circular hole is formed in the upper end of the jaw 34, and the protrusion of the connecting block 33 is arranged in the circular hole of the jaw 34.
Example 7:
on the basis of embodiment 1, the embodiment of the invention provides a coiled tubing hydraulic fishing string of a downhole choke, which is composed of coiled tubing, a connector, a check valve 3, a safety joint 4, a hydraulic casing anchor 1 and a hydraulic fishing tool 2 which are connected from top to bottom as shown in fig. 1.
After the hydraulic fishing tool 2 grabs the throttler 5, the pressure is suppressed through the continuous oil pipe, the fishing tool is pushed by hydraulic pressure to push a push rod 8 to push a central rod of the throttler 5, and the throttler 5 is unsealed; in order to prevent the fishing tool from excessively large reaction force to break the fishing neck 6 of the throttler 5, the idea of matching the hydraulic casing anchor 1 is provided, and the hydraulic casing anchor 1 is anchored on the inner wall of a production pipe column to bear the upward reaction force of the outer cylinder 25 of the fishing tool while the fishing tool mandrel 30 is pushed by the suppressed pressure hydraulic pressure. After the throttler 5 is unsealed, the coiled tubing is decompressed, the anchor fluke 19 of the hydraulic casing anchor 1 is withdrawn, and the throttler 5 can be fished out by lifting the pipe column.
Example 8:
the embodiment of the embodiment provides a method for fishing an underground throttle, a coiled tubing hydraulic fishing pipe column of the underground throttle is adopted, the coiled tubing hydraulic fishing pipe column of the underground throttle is lowered, a hydraulic fishing tool 2 grasps a fishing neck 6 of the throttle 5, then the coiled tubing is suppressed, a fluke 19 of a hydraulic casing anchor 1 extends out to be meshed with the inner wall of a casing, meanwhile, a push rod 8 of the hydraulic fishing tool 2 pushes a central rod of the throttle 5 under the hydraulic action, the throttle 5 is unsealed, after the throttle 5 is unsealed, the coiled tubing is decompressed, the fluke 19 of the hydraulic casing anchor 1 is withdrawn, and the pipe column is lifted to fish the throttle 5.
The method solves the problem that the throttler 5 well which is partially difficult to salvage cannot be salvaged, ensures the normal production of the wells, provides a new means for the salvage of the throttler 5, and fills the blank in the aspects of China and abroad.
Example 9:
on the basis of the embodiment 8, the embodiment provides a method for salvaging a downhole choke, a piston I20 of a hydraulic casing anchor 1 and an anchor body 15 form a sealed cavity through the pressure build-up of a continuous oil pipe, a lower pushing force is generated to shear a safety shear pin 16 to push a central pipe 13 to move downwards in the anchor body 15, the conical surface of the central pipe 13 and the inclined surface of an anchor claw 19 move relatively, so that the anchor claw 19 extends out of the anchor body 15 and is meshed with the inner wall of the casing pipe to form anchoring.
The matched hydraulic casing anchor 1 can solve the problem that the fishing neck 6 of the throttle 5 is broken by overlarge reaction force of a fishing tool.
Example 10:
on the basis of embodiment 8, the embodiment provides a method for salvaging a downhole choke, which comprises the following specific steps:
1) And after the coiled tubing is connected with the fishing tool combination, the production tubing is put in. Controlling the lowering speed to be less than 600m/h,
2) After the hydraulic fishing tool 2 grabs the throttler 5, the pressure is suppressed to 30-35MPa through the continuous oil pipe, the fishing tool is pushed by hydraulic pressure to push a push rod 8 to push a central rod of the throttler 5, and the throttler 5 is unsealed;
3) After the throttler 5 is unsealed, the coiled tubing is decompressed, the anchor fluke 19 of the hydraulic casing anchor 1 is withdrawn, and the throttler 5 can be fished out by lifting the pipe column.
The invention has the following characteristics:
(1) The hydraulic fishing tool 2 has a good grabbing function. (2) The single-piston hydraulic fishing tool has the advantages that the thrust of the push rod with the pressure of 30-35MPa reaches 30-35kN, and the unfreezing function is good. (3) Continuously suppress to 50 MPa, the throttler 5 releases smoothly, and the hand function is good. (4) The pipe column operation can realize a plurality of processes such as grabbing, salvaging and the like. (5) The matched hydraulic casing anchor 1 can solve the problem that the fishing neck 6 of the throttler 5 is broken by overlarge reaction force of a fishing tool. (6) The oil pipe is decompressed to release the anchoring, and the deblocking process is simple and safe.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims.
Claims (7)
1. The utility model provides a tubular column is salvaged to downhole choke coiled tubing hydraulic pressure which characterized in that: the device comprises a continuous oil pipe, a hydraulic casing anchor and a hydraulic fishing tool which are sequentially connected from top to bottom;
the hydraulic fishing tool comprises a hydraulic mechanism and a fishing mechanism which are sequentially connected from top to bottom, and the hydraulic mechanism and the fishing mechanism are connected through a connecting seat;
the hydraulic mechanism comprises a second upper joint and an outer barrel which are sequentially connected from top to bottom, a second piston and a push rod are arranged in the outer barrel, and the second piston is arranged above the push rod;
the fishing mechanism comprises a spacing sleeve, a fixing sleeve, a mandrel, a clamping jaw and a locking sleeve, wherein the spacing sleeve is connected with the outer barrel through a connecting seat, the fixing sleeve and the mandrel are both arranged in the spacing sleeve, the mandrel is arranged on the inner side of the fixing sleeve, a spring is arranged between the mandrel and the spacing sleeve, the spring is compressed and arranged between the fixing sleeve and the connecting seat, the fixing sleeve and the mandrel are fixed through a shearing pin, a rectangular spring is sleeved outside the fixing sleeve and positioned below the spacing sleeve, the clamping jaw is connected with the lower end of the mandrel and positioned below the rectangular spring, a space is reserved between the top of the clamping jaw and the fixing sleeve, and the clamping jaw is embedded in the locking sleeve;
the hydraulic casing anchor comprises an upper connector I, a connecting sleeve, an anchor body and a lower connector which are sequentially connected, wherein a locking ring is arranged in the connecting sleeve, the locking ring is fixedly connected with the connecting sleeve through a locking shear pin, a central pipe is arranged in the anchor body and fixed with the central pipe through a safety shear pin, a locking ring is sleeved at the upper end of the central pipe, an anchor claw is fixedly arranged on the anchor body, and a piston I is fixedly arranged at the lower part of the central pipe.
2. The downhole choke coiled tubing hydraulic fishing string of claim 1, wherein: and a check valve is arranged between the hydraulic casing anchor and the coiled tubing.
3. The downhole choke coiled tubing hydraulic fishing string of claim 1, wherein: the clamping jaw is connected with the mandrel through a connecting block, a limiting step is arranged on the outer side of the lower end of the mandrel, the connecting block is arranged on the limiting step, a protrusion is arranged on the outer side of the connecting block, a round hole is formed in the upper end of the clamping jaw, and the protrusion of the connecting block is arranged in the round hole of the clamping jaw.
4. A method for salvaging a downhole choke, which adopts the coiled tubing hydraulic salvaging pipe column of the downhole choke in claim 1, and is characterized in that: the hydraulic fishing pipe column is characterized in that a coiled tubing hydraulic fishing pipe column of the underground throttle is lowered, a hydraulic fishing tool grasps a fishing neck of the throttle, then the coiled tubing is suppressed, a fluke of a hydraulic casing anchor extends out to be meshed with the inner wall of a casing, meanwhile, a push rod of the hydraulic fishing tool pushes a center rod of the throttle under the hydraulic action, so that the throttle is unsealed, after the throttle is unsealed, the coiled tubing is decompressed, the fluke of the hydraulic casing anchor is withdrawn, and the coiled tubing is lifted to pull the pipe column to fish out the throttle.
5. The method for fishing the downhole choke according to claim 4, wherein: through the pressure build-up of the continuous oil pipe, a piston I of the hydraulic casing anchor and an anchor body form a sealed cavity, a lower pushing force is generated to cut off the safety shear pin to push the central pipe to move downwards in the anchor body, and the conical surface of the central pipe and the inclined surface of the fluke generate relative motion to enable the fluke to extend out of the anchor body and be meshed with the inner wall of the casing to form anchoring.
6. The method for fishing the downhole choke according to claim 4, wherein: the speed of lowering the downhole choke coiled tubing hydraulic salvaging pipe column is less than 600m/h.
7. The method for fishing the downhole choke according to claim 4, wherein: the coiled tubing is held back to 30-35MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110034697.4A CN112943143B (en) | 2021-01-12 | 2021-01-12 | Hydraulic salvaging pipe column and salvaging method for coiled tubing of downhole choke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110034697.4A CN112943143B (en) | 2021-01-12 | 2021-01-12 | Hydraulic salvaging pipe column and salvaging method for coiled tubing of downhole choke |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112943143A CN112943143A (en) | 2021-06-11 |
| CN112943143B true CN112943143B (en) | 2022-10-04 |
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| CN202110034697.4A Active CN112943143B (en) | 2021-01-12 | 2021-01-12 | Hydraulic salvaging pipe column and salvaging method for coiled tubing of downhole choke |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113958283B (en) * | 2021-12-21 | 2022-03-08 | 四川环钻星空能源科技有限公司 | Underground fishing tool |
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2021
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