CN108661586B - A salvage cylinder for coiled tubing - Google Patents
A salvage cylinder for coiled tubing Download PDFInfo
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- CN108661586B CN108661586B CN201710204820.6A CN201710204820A CN108661586B CN 108661586 B CN108661586 B CN 108661586B CN 201710204820 A CN201710204820 A CN 201710204820A CN 108661586 B CN108661586 B CN 108661586B
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- release
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- 210000000078 claw Anatomy 0.000 claims description 16
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 241000251468 Actinopterygii Species 0.000 abstract description 41
- 238000007789 sealing Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000012224 working solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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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- 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 fishing barrel for a coiled tubing, and relates to the technical field of workover tools adopted in oil fields. The overshot comprises an overshot upper shell, an overshot lower shell and a guide shoe which are sequentially arranged along the axial direction, and the overshot is sequentially arranged inside the overshot from top to bottom: the fishing device comprises a hydraulic driving assembly, a releasing assembly, a fishing slip with an annular structure and a locking ring; the lower end of the release assembly is provided with a wedge-shaped surface, the wedge-shaped surface is connected with the inner side surface of the fishing slip, and the hydraulic drive assembly is used for driving the lower end surface of the release assembly to go deep into the fishing slip and expanding the inner diameter of the fishing slip. Make the release assembly expand the internal diameter of salvaging the slips through the mode of hydraulic drive to effectively release the fish, solved among the prior art with the technical difficulty of coiled tubing complex fishing tool in the existence of release fish.
Description
Technical Field
The invention relates to the technical field of oil extraction and workover tools, in particular to a fishing barrel for a coiled tubing.
Background
Coiled tubing is a well-flexible tubing, typically a coil of coiled tubing can be up to several kilometers in length. Compared with the conventional oil pipe, the coiled oil pipe has the characteristics of operation under pressure and continuous lifting, and has small equipment volume, quick operation period and low cost. Coiled tubing is used in many fields of oilfield exploitation to replace conventional tubing operations, such as sand washing, paraffin removal, acidification, salvage, cement extrusion, drilling, descaling and the like.
According to the prior art, the coiled tubing is applied to fishing operation, compared with the conventional tubing, the coiled tubing omits the process of connecting the tubing section by section, and different fishing tools can be connected to the end part of the coiled tubing to perform downhole operation according to different fish types. For example, when fishing tubular fish, a retractable slip overshot is attached to the end of the coiled tubing. When the fishing device is used, the coiled tubing is utilized to enable the retractable fishing barrel to be placed in a well, the working fluid is pumped into the coiled tubing to wash the top of a fish to the fish falling position, then the coiled tubing is continuously placed in the well, the fish is led into the fishing barrel through the guide shoe, and the pipe type fish is fixed through the slips to be lifted and fished. In the process of lifting the fallen fish, the condition that the fallen fish is possibly prevented from lifting due to the influence of dirt in a shaft can be adopted, and the operation mode of pressing and hard pulling or re-fishing after releasing the catching of the fallen fish can be adopted. Particularly, when the retractable slip overshot is used for fishing, the fallen fish can be released through rotation.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
in the prior art, when a fallen fish is salvaged and lifted to be blocked, the coiled tubing cannot effectively realize the rotary release process of the retractable slip overshot, so that a pressurized hard-pulling salvage mode is adopted, the salvage success rate is reduced, and the operation mode does not show the advantage of rapid operation of the coiled tubing. It can be seen that the fishing tool used in the prior art has the problem of difficulty in releasing fish when used in cooperation with a coiled tubing.
Disclosure of Invention
In order to solve the problem that fish is difficult to release when a fishing tool is matched with a coiled tubing in the prior art, the embodiment of the invention provides the fishing tool for the coiled tubing, and the technical scheme is as follows:
the embodiment of the invention provides an overshot for a coiled tubing, which comprises an overshot upper shell, an overshot lower shell and a guide shoe which are sequentially arranged along the axial direction, and is characterized in that,
the inside fishing barrel has set gradually from top to bottom: the fishing device comprises a hydraulic driving assembly, a releasing assembly, a fishing slip with an annular structure and a locking ring;
the lower end part of the release component is provided with a wedge-shaped surface which is connected with the inner side surface of the fishing slip,
the hydraulic driving assembly is used for driving the lower end face of the releasing assembly to penetrate into the fishing slip and expanding the inner diameter of the fishing slip.
Preferably, the upper casing and the lower casing of the overshot form a first mounting cavity for mounting the hydraulic drive assembly,
the hydraulic drive assembly includes: a piston with a hollow tubular structure is arranged in the piston,
a valve ball valve arranged in the inner cavity of the lower end of the piston, and
the lower end of the upper driving spring is contacted with the upper end surface of the release assembly;
the piston can drive the valve ball valve to move together along the axial direction.
Preferably, a first pressure relief hole is formed in the side wall of the shell at the upper part of the overshot, a second pressure relief hole is formed in the side wall of the piston, and the second pressure relief hole can be aligned with the first pressure relief hole when the piston moves downwards.
Preferably, the valve ball valve comprises a valve seat arranged in the inner cavity of the piston, an annular valve seat baffle fixedly connected with the lower end face of the piston, and a valve ball matched with the valve seat.
Preferably, the overshot lower casing and the guide shoe form a second mounting cavity, and the release assembly is arranged in the second mounting cavity;
the releasing assembly comprises a releasing ring and a releasing synchronous ring, the upper end face of the releasing ring is in contact with the lower end of the upper driving spring, the releasing synchronous ring is connected with the lower end face of the releasing ring, and the upper end of the releasing synchronous ring is provided with a wedge-shaped surface in contact with the inner surface of the fishing slip.
Preferably, a fixing groove having an inner diameter matched with the upper driving spring is provided at an upper end of the release ring.
Preferably, a salvaging bracket is further arranged in the second mounting cavity, the salvaging bracket is sleeved outside the release ring, and the height of the salvaging bracket is smaller than that of the release ring; the upper end of the release ring is provided with a step surface, and the step surface can be contacted with the upper end surface of the fishing bracket.
Preferably, the fishing slip comprises a slip fishing claw, a slip fishing ring fixedly connected with the lower end of the slip fishing claw, and a lower driving spring fixedly connected with the fishing ring, and a convex ring is arranged on the outer side surface of the upper end of the slip fishing claw; and a safety ring is arranged in a hole between the slip fishing claw and the fishing support.
Preferably, at least two convex rings are arranged on the inner side surface of the slip fishing ring.
Preferably, the outer side surface of the upper shell of the overshot is provided with six outer aspects which are convenient to mount and dismount.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
in use, the overshot provided by the embodiment of the invention is connected to the lower end of the coiled tubing and is lowered into the well bore, the top of the falling fish is introduced into the overshot through the guide shoe, and then the falling fish is salvaged through the fishing slips. When meeting the fish and lifting the difficult condition, through going into working solution to the continuous oil pipe in, the hydraulic drive subassembly drive release assembly moves down under the effect of working solution for the wedge face of release assembly wedges the inside of salvaging slips 9, and along with the removal down of release assembly, the internal diameter of salvaging slips constantly expands, can relieve the fish that has caught this moment, conveniently carries out follow-up operation. The release assembly expands the inner diameter of the fishing slips in a hydraulic driving mode, so that the fish is effectively released, the technical difficulty of the fishing tool matched with the coiled tubing in releasing the fish in the prior art is solved, and the characteristic of rapid operation of the coiled tubing is reflected and utilized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an overshot for coiled tubing according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along A-A of a coiled tubing overshot according to an embodiment of the present invention;
fig. 3 is a partial structural schematic diagram of a coiled tubing overshot according to an embodiment of the present invention.
In the drawings, the respective reference numerals are:
1. the fishing rod comprises an upper shell of the fishing barrel, 101, an upper joint, 102, six external aspects, 103, a first pressure relief hole;
2. a lower casing of the overshot;
3. guiding a shoe;
4. piston, 41, second relief hole;
5. a valve ball valve, 51, a valve ball, 52, a valve seat and 53, a valve seat baffle;
6. an upper drive spring;
7. a release assembly, 71 release ring, 72 release synchronizing ring, 721 rectangular sealing ring, 722 semicircular sealing ring;
8. mounting a bracket;
9. fishing slips, 91, slip fishing claws, 92, a slip fishing ring;
10. a lower drive spring;
11. a locking ring;
12. and a safety ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides an overshot for a coiled tubing, and referring to fig. 2, the overshot comprises an overshot upper shell 1, an overshot lower shell 2 and a guide shoe 3 which are sequentially arranged along the axial direction; and is arranged in the fishing barrel from top to bottom in sequence: the hydraulic driving assembly, the releasing assembly 7, the fishing slips 9 with annular structures and the locking ring 11; the lower end part of the release assembly 7 is provided with a wedge-shaped surface, the wedge-shaped surface is connected with the inner side surface of the fishing slip 9, and the hydraulic drive assembly is used for driving the lower end surface of the release assembly 7 to go deep into the fishing slip 9 and expanding the inner diameter of the fishing slip 9.
In use, the overshot provided by the embodiment of the invention is connected to the lower end of a coiled tubing and lowered into a wellbore, the top of a fish is introduced into the overshot through the guide shoe 3, and then is salvaged through the fishing slips 9. When meeting the condition that the fish is difficult to lift, the hydraulic driving assembly drives the release assembly 7 to move downwards under the action of the working liquid by pumping the working liquid into the continuous oil pipe, so that the wedge-shaped surface of the release assembly 7 is wedged into the interior of the fishing slip 9, the inner diameter of the fishing slip 9 is continuously expanded along with the downward movement of the release assembly 7, the captured fish can be released at the moment, and the subsequent operation is convenient to perform.
The fishing cylinder provided by the embodiment of the invention enables the release assembly 7 to expand the inner diameter of the fishing slip 9 in a hydraulic driving mode, so that the fallen fish is effectively released, the technical difficulty of the fishing tool matched with the coiled tubing in the prior art in releasing the fallen fish is solved, and the characteristic of rapid operation of the coiled tubing is reflected and utilized.
Wherein, locking ring 11 can avoid each subassembly in the overshot inner chamber to break away from the overshot, guarantees the normal use of overshot, does not do specifically to locking ring 11's fixed mode and does not restrict, can with overshot lower part shells inner wall threaded connection or joint etc.. It should also be noted that, referring to fig. 1, the upper casing 1 of the overshot also has an upper fitting 101, which upper fitting 101 is dimensioned to fit the coiled tubing for connection thereto. And the outer side surface of the upper shell 1 of the overshot is also provided with an outer six-way 102, so that an auxiliary tool can be conveniently clamped outside the overshot to realize the connection with the continuous oil pipe.
Further, embodiments of the present invention provide a possible solution for the hydraulic drive assembly described above. In particular, with reference to fig. 1, the overshot upper casing 1 and the overshot lower casing 2 form a first mounting chamber for mounting a hydraulic drive assembly. Wherein, water drive assembly includes: the device comprises a piston 4 with a hollow tubular structure, a valve ball valve 5 arranged in an inner cavity at the lower end of the piston 4, and an upper driving spring 6 contacted with the lower end surface of the valve ball valve 5, wherein the lower end of the upper driving spring 6 is contacted with the upper end surface of a release assembly 7; the piston 4 can drive the valve ball valve 5 to move along the axial direction.
Because the hydraulic driving assembly also has a hollow structure, when the fish is released, the inner cavity of the overshot is blocked by the valve ball valve 5, and at the moment, the working fluid pumped into the coiled tubing is accumulated in the part above the valve ball valve 5 in the inner cavity of the piston 4, and generates an axial downward acting force on the piston 4 to push the piston 4 to move downwards. The piston 4 further presses the upper driving spring 6 downwards along the axial direction, and the upper driving spring 6 drives the releasing assembly 7 to move downwards to realize the fish releasing process.
In order to ensure the normal driving work of the hydraulic driving component, a first pressure relief hole 103 is formed in the side wall of the casing 1 at the upper part of the overshot, a second pressure relief hole 41 is formed in the side wall of the piston 4, and the second pressure relief hole 41 can be aligned with the first pressure relief hole 103 when the piston 4 descends. When carrying out the fish release operation, piston 4 descends to first pressure release hole 103 of second pressure release hole 41 alignment, and the inside liquid accessible pressure release hole passageway discharge overshot of piston 4 this moment effectively cushions the impact that piston 4 brought when descending to last drive spring 6, avoids the appearance violent collision between each subassembly. Meanwhile, a sealing ring is arranged between the piston 4 and the outer cylinder 1 of the upper shell of the overshot, so that the sealing performance is improved, and the working fluid pumped into the coiled tubing is ensured to effectively drive the piston 4 to move downwards. The number of the seal rings is not particularly limited, and may be 4, 5, 6, or the like.
Meanwhile, the structure of the valve ball valve 5 is not particularly limited, and a valve ball valve 5 which is common in the prior art can be adopted. Regarding the connection relationship between the valve ball 5 and the piston 4, specifically, the valve ball 5 includes a valve seat 52 disposed in the inner cavity of the piston 4, an annular valve seat baffle 53 fixedly connected to the lower end surface of the piston 4, and a valve ball 51 matched with the valve seat 52. The valve ball 51 is used with the cooperation of valve seat 52 and is realized the intercommunication or the closure of overshot inner chamber, and drive spring 6 is gone up in the bottom surface contact of valve seat baffle 53, compares with drive spring 6 in the valve seat 52 direct contact, sets up valve seat baffle 53 and effectively increases the area of contact with last drive spring 6, the job stabilization nature of the subassembly of being convenient for.
In summary, it is easy to see that the hydraulic drive assembly also has a hollow structure: when the hydraulic driving component blocks the inner cavity of the fishing barrel, the hydraulic driving function can be realized, and the release component is driven to work; when the hydraulic drive assembly is communicated with the inner cavity of the fishing barrel, the working fluid can be pumped into the fishing barrel through the coiled tubing to wash the top of the fish. Meanwhile, when fish does not need to be released, the fishing barrel can be quickly connected with a broken pipeline in a shaft, so that well flushing operation is facilitated. Specifically, a well-flushing liquid is pumped in through the continuous oil pipe, the well-flushing liquid is discharged from the tail end of the inner pipe body of the shaft, and then returns to the outside of the well from an annular space between the oil pipe and the shaft, and meanwhile, impurities on the periphery of the inner pipe body of the shaft can be carried out along with the well-flushing liquid, so that obstruction is reduced for subsequent fishing work, and the fishing success rate is improved.
Further, regarding the structure of the release assembly 7, referring to fig. 2, the overshot lower casing 2 and the guide shoe 3 form a second mounting cavity in which the release assembly 7 is disposed; the release assembly 7 comprises a release ring 71 with an upper end surface contacting the lower end of the upper drive spring 6, a release synchronizing ring 72 connected with the lower end surface of the release ring 71, and the upper end of the release synchronizing ring 72 is provided with a wedge surface contacting the inner surface of the fishing slip 9. When the fish is released, the upper driving spring 6 pushes the release ring 71 to descend, the release ring 71 pushes the release synchronizing ring 72 and enables the wedge-shaped surface of the release synchronizing ring 72 to be wedged into the fishing slips 9, so that the inner diameter of the fishing slips 9 is expanded, and the captured fish is released. Further, referring to fig. 3, at least two sealing rings, such as a rectangular sealing ring 721 and a semicircular sealing ring 722 in fig. 3, are further disposed on the inner side surface of the release synchronizing ring 72, and when a connection is established with a disconnecting pipeline in a wellbore, the sealing rings inside the release synchronizing ring 72 ensure the connection sealing performance of the overshot and the disconnecting pipeline, so as to facilitate subsequent operations such as well washing.
In addition, in order to improve the stability of the release assembly, a fixing groove having an inner diameter matched with the upper driving spring 6 is provided at the upper end of the release ring 71. So that no spring end deflection occurs when the upper drive spring 6 presses the release ring 71 downward. Meanwhile, a salvaging bracket 8 is also arranged in the second mounting cavity, referring to fig. 2, the salvaging bracket 8 is sleeved outside the release component 7 and the salvaging slip 9, and the height of the salvaging bracket 8 is less than that of the release ring 71; the upper end of the release ring 71 is provided with a step surface which can be contacted with the upper end surface of the fishing bracket 8. The step surface of the release ring 71 plays a limiting role, the descending distance of the release ring 7 is limited, and the release assembly 7 is prevented from damaging the fishing slips 9. Meanwhile, the fishing bracket 8 limits the radial movement of the release assembly 7 in the fishing barrel, the stability of the assembly is improved, and the normal work of the fishing barrel is ensured. More specifically, the inner diameter of the fishing bracket 8 is small and large, wherein the inner diameter of the upper part of the fishing bracket 8 is matched with the outer diameter of the release ring 71, and the inner diameter of the lower part of the fishing bracket 8 is large, so as to form an installation cavity of the fishing slips 9.
Further, referring to fig. 3, the fishing slip 9 includes a slip fishing claw 91, a slip fishing ring 92 disposed at a lower end of the slip fishing claw 91 and integrally formed with the slip fishing claw 91, and a lower driving spring 10 fixedly connected to a lower end surface of the fishing ring 92, wherein a safety ring 12 is disposed in an aperture between the slip fishing claw 91 and the fishing bracket 8, and a convex ring is disposed on an upper end outer side surface of the slip fishing claw 91. And the inner side surface of the slip fishing claw 91 is provided with fishing teeth for gripping tubular fish. When carrying out the fishing operation, the fish top is inside through guide 3 entering fishing barrel, when carrying the fishing barrel, the fish downstream drives down driving spring 10, salvage slips ring 92 and slips fishing claw 91 and move down the certain distance under driving spring 10's effect down this moment, nevertheless owing to set up the bulge loop in the upper portion outside slips fishing claw 91, consequently this bulge loop and salvage insurance ring 12 combined action for salvage slips claw 91 tightens up, and then clenches the fish, prevent that the fish from droing and realizing salvaging. In addition, still can set up two at least bulge loops at slips salvage ring 92's medial surface, the bulge loop is along radially inwards outstanding, has played the effect that prevents that the fish from droing, guarantees to salvage the success rate.
In summary, when the fishing barrel provided by the embodiment of the invention encounters the situation that the fallen fish is difficult to lift, the hydraulic driving assembly drives the release assembly 7 to move downwards under the action of the working fluid pumped into the coiled tubing, so that the wedge-shaped surface of the release assembly 7 is wedged into the fishing slip 9, and the inner diameter of the fishing slip 9 is continuously expanded along with the downward movement of the release assembly 7, so that the caught fallen fish can be released, and the subsequent operation is convenient. Meanwhile, the overshot provided by the embodiment of the invention can be quickly connected with an underground disconnecting pipeline to carry out operations such as well washing and the like, so that fishing operation cannot be influenced by impurities, sand, oil stains and the like in a well, and a well washing circulation channel can be established to carry out full well washing when no valve ball 51 is thrown in; when the valve ball 51 is thrown in, an external well-flushing channel can be established between the upper part of the tool and the coiled tubing. In addition, the hydraulic drive release is simple and easy to operate. And the whole overshot has simple and practical structure, light weight, convenient connection and installation, good connection sealing performance and high operation efficiency, greatly reduces the manual operation amount and improves the production 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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An overshot for a coiled tubing, which comprises an overshot upper shell (1), an overshot lower shell (2) and a guide shoe (3) which are sequentially connected along the axial direction, and is characterized in that,
the inside fishing barrel has set gradually from top to bottom: the fishing device comprises a hydraulic driving assembly, a releasing assembly (7), a fishing slip (9) with an annular structure and a locking ring (11);
the lower end part of the release component (7) is provided with a wedge-shaped surface which is contacted with the inner side surface of the fishing slip (9),
the hydraulic driving assembly is used for driving the lower end face of the releasing assembly (7) to penetrate into the fishing slips (9) and expanding the inner diameter of the fishing slips (9).
2. The overshot according to claim 1, characterized in that the overshot upper casing (1) and the overshot lower casing (2) are formed with a first mounting chamber for mounting the hydraulic drive assembly,
the hydraulic drive assembly includes: a piston (4) having a hollow tubular structure,
a valve ball valve (5) arranged in the lower inner chamber of the piston (4), and
the lower end of the upper driving spring (6) is contacted with the upper end surface of the release assembly;
the piston (4) can drive the valve ball valve (5) to move together along the axial direction.
3. Overshot according to claim 2, characterized in that a first pressure relief opening (103) is provided in the side wall of the overshot upper housing (1), that a second pressure relief opening (41) is provided in the side wall of the piston (4), and that the second pressure relief opening (41) is aligned with the first pressure relief opening (103) when the piston (4) is lowered.
4. The overshot according to claim 2, characterized in that the valve ball valve (5) comprises a valve seat (52) arranged in the inner chamber of the piston (4), an annular valve seat baffle (53) fixedly connected to the lower end face of the piston (4), and a valve ball (51) matching the valve seat (52).
5. The overshot according to claim 2, characterized in that the overshot lower casing (2) and the guide shoe (3) form a second mounting cavity in which the release assembly (7) is arranged;
the releasing assembly (7) comprises a releasing ring (71) with the upper end surface contacting with the lower end of the upper driving spring (6), and a releasing synchronous ring (72) connected with the lower end surface of the releasing ring (71), wherein the upper end of the releasing synchronous ring (72) is provided with the wedge-shaped surface contacting with the inner surface of the fishing slip (9).
6. The overshot according to claim 5, characterized in that a fixing groove with an inner diameter adapted to the upper drive spring (6) is also provided at the upper end face of the release ring (71).
7. The overshot according to claim 5, characterized in that a fishing bracket (8) is arranged in the second installation cavity, the fishing bracket (8) is sleeved outside the release ring (71), and the height of the fishing bracket (8) is smaller than that of the release ring (71);
the upper end of the release ring (71) is provided with a step surface which can be contacted with the upper end surface of the fishing bracket (8).
8. The overshot according to claim 7, characterized in that the fishing slips (9) comprise a slip catch (91), a slip catch ring (92) arranged at the lower end of the slip catch (91) and formed integrally with the slip catch (91), and a lower drive spring (10) fixedly connected to the catch ring (92),
a convex ring is arranged on the outer side surface of the upper end of the slip fishing claw (91);
a safety ring (12) is arranged in a gap between the slip fishing claw (91) and the fishing support (8).
9. The overshot of claim 8, characterized in that at least two collars are provided on the inner side of the slip ring (92).
10. The overshot according to any one of claims 1-9, characterised in that outer six sides (102) are provided on the outer side of the overshot upper shell (1) for easy mounting and dismounting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710204820.6A CN108661586B (en) | 2017-03-30 | 2017-03-30 | A salvage cylinder for coiled tubing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710204820.6A CN108661586B (en) | 2017-03-30 | 2017-03-30 | A salvage cylinder for coiled tubing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108661586A CN108661586A (en) | 2018-10-16 |
| CN108661586B true CN108661586B (en) | 2020-04-10 |
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| CN201710204820.6A Active CN108661586B (en) | 2017-03-30 | 2017-03-30 | A salvage cylinder for coiled tubing |
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| CN109538145A (en) * | 2019-01-08 | 2019-03-29 | 成都百胜野牛科技有限公司 | Plunger catcher |
| CN109899035A (en) * | 2019-04-15 | 2019-06-18 | 成都百胜野牛科技有限公司 | Plunger operating device |
| CN110821434B (en) * | 2019-11-11 | 2023-08-18 | 中国石油天然气集团有限公司 | Self-tightening claw, retractable reducing fishing tool and method |
| CN113492415B (en) * | 2020-04-02 | 2024-05-28 | 运鼎科技（北京）有限公司 | Clamping jaw |
| CN111350470A (en) * | 2020-04-02 | 2020-06-30 | 四川安东油气工程技术服务有限公司 | Fishing tool |
| CN115788370B (en) * | 2023-02-09 | 2023-05-23 | 山东华曦石油技术服务有限公司 | Continuous cold recovery device for thickened oil and use method |
| CN117514057B (en) * | 2024-01-04 | 2024-04-02 | 大庆辰平钻井技术服务有限公司 | Overshot for oil well and ultra-short radius horizontal well blocking removing method |
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| US3942833A (en) * | 1969-09-18 | 1976-03-09 | Plunk Rowe A | Running tools |
| CN201100111Y (en) * | 2007-09-29 | 2008-08-13 | 华北石油管理局 | Removable card tile bushing hoping and positioning wrecker |
| US8590613B2 (en) * | 2011-01-05 | 2013-11-26 | Baker Hughes Incorporated | Overshot with dynamic seal feature |
| CN202544790U (en) * | 2012-03-31 | 2012-11-21 | 中国石油集团长城钻探工程有限公司 | Releasing slip socket for well repair |
| SE1451380A1 (en) * | 2014-11-17 | 2016-05-18 | Vanguard Oil Tools & Services Llc | Retrievable re-connecting device with internal seal and slips for connecting to the top of an existing tubing in a wellbore |
| CN205778669U (en) * | 2016-05-31 | 2016-12-07 | 托普威尔石油技术股份公司 | The outer fisher of a kind of reversible |
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| Publication number | Publication date |
|---|---|
| CN108661586A (en) | 2018-10-16 |
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