CN107956445B - Full-hydraulic internal cutting device - Google Patents
Full-hydraulic internal cutting device Download PDFInfo
- Publication number
- CN107956445B CN107956445B CN201810010480.8A CN201810010480A CN107956445B CN 107956445 B CN107956445 B CN 107956445B CN 201810010480 A CN201810010480 A CN 201810010480A CN 107956445 B CN107956445 B CN 107956445B
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- CN
- China
- Prior art keywords
- mandrel
- shell
- guide
- cutting
- hole
- Prior art date
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Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 67
- 238000010008 shearing Methods 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 16
- 239000012530 fluid Substances 0.000 abstract description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
-
- 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
- E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Marine Sciences & Fisheries (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the field of full-hydraulic internal cutting, and belongs to the technical field of underground cutting tools. The cutting tool consists of a shell, a mandrel cap, a lower connector and a cutting tool, wherein the lower connector is arranged at the lower end of the shell in a threaded manner, the mandrel is movably arranged in the shell, a mandrel seat is arranged on the shell below the mandrel, one end of the mandrel seat is in threaded connection with the lower connector, and the cutting tool is arranged on the shell corresponding to the mandrel through a pin column and the tool rest. The device has simple principle and compact structure, and can judge the motion state of the mandrel and the cutter according to the change of drilling fluid pressure observed on the ground in the sleeve cutting process; the axial moving distance of the mandrel can be changed by changing the mandrel seats with different sizes, so that the maximum cutting outer diameter of the cutter is changed, the sleeves with different outer diameters can be cut, and the application range of the device is greatly improved.
Description
Technical Field
The invention relates to the field of full-hydraulic internal cutting, and belongs to the technical field of underground cutting tools.
Background
The well abandoning operation is used as the last link in the well drilling operation, and is an indispensable procedure in the oil and gas exploration and development process. In recent years, the ocean drilling mode is changed, the drilling range is gradually changed from shallow sea to deep sea, the shallow oil and gas layer is changed to the deep oil and gas layer, the simple geological layer is changed to the complex geological layer, and the conventional cutting recovery method is very difficult to recover the seabed wellhead system due to the influence of the sea condition of the drilling area. The underwater cutting technology is not a continuation of land cutting, and the complexity and difficulty of underwater engineering are determined by the special underwater working environment, so that the technology has unique theoretical basis and implementation method, and many technologies applied on land are not suitable for underwater. Currently, technologies applied to deep water sleeve cutting mainly comprise blasting cutting, chemical cutting, abrasive jet cutting, diamond cutting rope technology, mechanical cutter cutting and the like. The mechanical hydraulic cutter is widely used because of simple structure, easy processing and manufacturing and low cost. However, the hydraulic internal cutter used at present has the following problems: the service life of the blade is not enough, the body cannot be automatically retracted after the cutting knife cuts, the tool structure is complex, the operation is complex, the cutting accident is easy to cause, the cutting efficiency is low, and a method for clearly judging whether the sleeve is completely cut is not available.
Disclosure of Invention
The invention aims at: the full-hydraulic internal cutting device is simple in structure and convenient to use, and solves the problems that an existing underground cutting device cutter can only be used once, and a cutting state cannot be confirmed in the cutting process.
The technical scheme of the invention is as follows:
the utility model provides a full hydraulic pressure hydraulic power formula endo cutting device, it comprises shell, mandrel cap, lower clutch, cutting knife, its characterized in that: the lower joint is installed to the shell lower extreme screw thread, and the shell is interior to be movably provided with the mandrel, and the mandrel seat is installed to the shell below the mandrel, and the one end and the lower joint threaded connection of mandrel seat installs the cutting knife through round pin post and knife rest on the shell that the mandrel corresponds, installs the connecting piece ring through locating pin on the mandrel that the cutting knife corresponds, and connecting piece ring passes through connecting rod and cutting knife swing joint.
The mandrel cap is arranged at the end head of the lower end of the mandrel through the shear pin A.
The mandrel cap is provided with a bypass hole.
The guide ring is arranged on the inner wall of the shell above the mandrel cap through a fixing bolt, and the guide ring is movably connected with the mandrel.
Guide teeth are axially and uniformly distributed on the inner wall of the guide ring, guide grooves corresponding to the guide teeth are formed in the mandrel, and the guide ring is in sliding connection with the mandrel through the cooperation of the guide teeth and the guide grooves.
And a shearing pin B is arranged on the shell below the guide ring.
The mandrel is a reducer tubular body, a guide hole is arranged on the mandrel above the guide ring, and the guide hole is communicated with the central hole of the mandrel.
And a mandrel drain hole is arranged on the mandrel above the guide hole.
A nozzle is arranged on the shell below the cutting knife and is in intermittent contact connection with the mandrel drain hole.
The cutting knife is evenly distributed with three groups along the circumferential direction of the shell, and the blade surface of the cutting knife is a triangular surface.
The mandrel seat is provided with a mandrel seat drain hole.
The invention has the beneficial effects that:
the full-hydraulic internal cutting device has the advantages that the principle is simple, the structure is compact, the movement states of the mandrel and the cutting knife can be judged according to the change of the drilling fluid pressure observed on the ground in the sleeve cutting process, the accuracy, the intuitiveness, the convenience and the reliability are realized, and the misjudgment can be avoided; the cutting knife of the device not only can cut the pipe sleeve, but also can salvage the pipe sleeve; the device can change the axial moving distance of the mandrel by changing the mandrel seats with different sizes, thereby changing the maximum cutting outer diameter of the device, cutting the pipe sleeves with different outer diameters and greatly improving the application range of the device.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a left side view of the present invention;
FIG. 3 is a schematic view of the present invention in an uncut state;
FIG. 4 is a schematic view of the working state of the present invention after cutting;
FIG. 5 is a schematic diagram showing the working state of the cutter according to the present invention when the cutter is reset;
FIG. 6 is a schematic diagram of the present invention in operation when fishing casing.
In the figure: 1. the device comprises a shell, 2, a mandrel, 3, a mandrel cap, 4, a lower joint, 5, a cutter, 6, a mandrel seat, 7, a tool rest, 8, a locating pin, 9, a connecting piece ring, 10, a connecting rod, 11, a shearing pin A,12, a bypass hole, 13, a fixing bolt, 14, a guide ring, 15, a guide tooth, 16, a guide groove, 17, a shearing pin B,18, a guide hole, 19, a mandrel drain hole, 20, a nozzle, 21, a mandrel seat drain hole, 22, a steel ball, 23 and a steel ball.
Detailed Description
The full-hydraulic internal cutting device is composed of a shell 1, a mandrel 2, a mandrel cap 3, a lower joint 4 and a cutting knife 5, wherein the lower joint 4 is arranged at the lower end of the shell 1 in a threaded manner, the mandrel 2 is movably arranged in the shell 1, the cutting knife 5 is arranged on the shell 1 corresponding to the mandrel 2 through a pin column and a knife rest 7, the cutting knife 5 is uniformly distributed in three groups along the circumferential direction of the shell 1, and the knife wing surface of the cutting knife 5 is a triangular surface. And a connecting piece ring 9 is arranged on the mandrel 2 corresponding to the cutter 5 through a locating pin 8, and the connecting piece ring 9 is movably connected with the cutter 5 through a connecting rod 10. Due to the special structure of the cutter 5, the device not only can cut the pipe sleeve through the cutter 5, but also can easily salvage the pipe sleeve due to the barb shape formed after the cutter 5 is unfolded and fixed.
The mandrel cap 3 is installed through shearing pin A11 to mandrel 2 lower extreme end, is provided with bypass hole 12 on the mandrel cap 3, installs guide ring 14 through fixing bolt 13 on the shell 1 inner wall of mandrel cap 3 top, and the axial equipartition has guide tooth 15 on the guide ring 14 inner wall, is provided with the guide slot 16 that corresponds with guide tooth 15 on the mandrel 2, through the cooperation sliding connection of guide tooth 15 and guide slot 16 between guide ring 14 and the mandrel 2 for mandrel 2 only makes axial motion and can not take place circumferential rotation at the during operation.
The mandrel 2 is a reducer tubular body, a diversion hole 18 is arranged on the mandrel 2 above the guide ring 14, the diversion hole 18 is communicated with the central hole of the mandrel 2, a mandrel drain hole 19 is arranged on the mandrel 2 above the diversion hole 18, and the mandrel drain hole 19 is intermittently connected (communicated) with the nozzle 20 when the mandrel 2 moves downwards.
A shear pin B17 is provided on the housing 1 below the guide ring 14, the shear pin B17 being in interference connection with the housing 1 such that the shear pin B17 is capable of securing the spindle 2 above the shear pin B17.
The shell 1 below the mandrel 2 is provided with a mandrel seat 6, one end of the mandrel seat 6 is in threaded connection with the lower joint 4, the mandrel seat 6 is provided with a mandrel seat drain hole 21, and when the bypass hole 12 on the mandrel cap 3 is communicated, the mandrel seat drain hole 21 is communicated with drilling fluid in the mandrel 2 and the lower joint 4 to form a loop.
In the working process of the full-hydraulic internal cutting device, when the device reaches a cutting position, the small steel ball 22 is thrown into the device, the small steel ball 22 moves to the central hole position of the mandrel cap 3 under the action of a pump force to contact and block the mandrel cap 3, at the moment, the drilling fluid pressure is increased, the mandrel drain hole 19 on the mandrel 2 is not communicated with the nozzle 20 on the shell 1, all the pump force acts on pushing the mandrel 2, and finally the shearing pin B17 is sheared by the mandrel cap 3, so that the mandrel 2, the connecting piece ring 9 and the mandrel cap 3 move downwards together; during the movement of the spindle 2 during the downward movement, the spindle drain hole 19 on the spindle 2 will gradually communicate with the nozzle 20 on the housing 1; simultaneously, when the mandrel 2 moves downwards, the cutter 5 is pushed by the connecting piece ring 9 and the connecting rod 10, the cutter 5 rotates out (stretches out) around the center of the pin, so that the pipe sleeve can be cut progressively, and meanwhile, the cutting scraps and the cutter 5 are washed by the nozzle 20; when the mandrel cap 3 is in full contact with the mandrel base 6, indicating that the cutting by the cutter 5 is complete, the mandrel drain hole 19 on the mandrel 2 is again displaced from the nozzle 20 on the housing 1, and the drilling fluid pressure remains unchanged.
Then gradually increasing the drilling pressure, wherein the drilling pressure acts on the mandrel cap 3 and the small steel ball 22 at the moment, and the pressure pushes the mandrel cap 3 and the small steel ball 22 to extrude downwards; a part of hydraulic pressure acts on the lower surface of the step surface of the mandrel 2 through the diversion hole 18, the pressure pushes the lower surface of the step surface of the mandrel 2 to be pressed upwards, so that the mandrel 2 moves upwards, the shearing pin A11 is sheared by the mandrel 2, the mandrel 2 is separated from the mandrel cap 3, at the moment, the mandrel 2 moves upwards under the action of the thrust of drilling fluid pressure and the gravity of the cutting knife 5, and the mandrel 2 and the cutting knife 5 return to the initial positions. As the mandrel 2 moves up to connect the bypass hole of the mandrel cap 3, the drilling fluid is connected up and down to form a circulation loop, and the drilling fluid pressure is reduced.
When the casing is required to be salvaged, the large steel ball 23 is put into the casing, the large steel ball 23 reaches the position of the pipe orifice at the upper end of the mandrel 2 under the action of the pump force, the large steel ball 23 contacts and blocks the pipe orifice of the mandrel 2, the pump force pushes the mandrel 2 downwards until the cutting knife 5 on the shell 1 is completely unfolded to bite the casing, and in the process of downwards moving the mandrel 2, the mandrel cap 3 is downwards pressed again, so that the mandrel cap 3 contacts with the mandrel seat 6, and the drilling fluid pressure is kept unchanged, so that the salvaging can be started.
The full-hydraulic internal cutting device has the advantages that the principle is simple, the structure is compact, the movement states of the mandrel 2 and the cutting knife 5 can be judged according to the change of the drilling fluid pressure observed on the ground in the sleeve cutting process, the accuracy, the intuitiveness, the convenience and the reliability are realized, and the misjudgment can be avoided; by changing the spindle bases 3 with different sizes, the axial moving distance of the spindle 2 can be changed, so that the maximum cutting outer diameter of the cutter 5 is changed, and the sleeves with different outer diameters can be cut, thereby greatly improving the application range of the device.
Claims (5)
1. The utility model provides a full hydraulic pressure hydraulic power formula endo cutting device, it comprises shell (1), mandrel (2), mandrel cap (3), lower clutch (4), cutting knife (5), its characterized in that: the lower end of the shell (1) is provided with a lower joint (4) in a threaded manner, the inside of the shell (1) is movably provided with a mandrel (2), the shell (1) below the mandrel (2) is provided with a mandrel seat (6), one end of the mandrel seat (6) is in threaded connection with the lower joint (4), the shell (1) corresponding to the mandrel (2) is provided with a cutting knife (5) through a pin column and a knife rest (7), the mandrel (2) corresponding to the cutting knife (5) is provided with a connecting piece ring (9) through a locating pin (8), and the connecting piece ring (9) is movably connected with the cutting knife (5) through a connecting rod (10); the lower end head of the mandrel (2) is provided with a mandrel cap (3) through a shear pin A (11); a guide ring (14) is arranged on the inner wall of the shell (1) above the mandrel cap (3) through a fixing bolt (13), and the guide ring (14) is movably connected with the mandrel (2); the mandrel (2) is a reducer tubular body, a diversion hole (18) is arranged on the mandrel (2) above the guide ring (14), and the diversion hole (18) is communicated with the central hole of the mandrel (2); a mandrel drain hole (19) is arranged on the mandrel (2) above the guide hole (18); a nozzle (20) is arranged on the shell (1) below the cutter (5), and the nozzle (20) is in intermittent contact connection with the mandrel drain hole (19).
2. The full hydraulic internal cutting device according to claim 1, wherein: the mandrel cap (3) is provided with a bypass hole (12).
3. The full hydraulic internal cutting device according to claim 1, wherein: guide teeth (15) are axially and uniformly distributed on the inner wall of the guide ring (14), guide grooves (16) corresponding to the guide teeth (15) are formed in the mandrel (2), and the guide ring (14) is in sliding connection with the mandrel (2) through the cooperation of the guide teeth (15) and the guide grooves (16).
4. A full hydraulic internal cutting device according to claim 3, characterized in that: a shearing pin B (17) is arranged on the shell (1) below the guide ring (14).
5. The full hydraulic internal cutting device according to claim 1, wherein: three groups of cutters (5) are uniformly distributed along the circumferential direction of the shell (1), and the cutter wing surfaces of the cutters (5) are triangular surfaces; the mandrel seat (6) is provided with a mandrel seat drain hole (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810010480.8A CN107956445B (en) | 2018-01-05 | 2018-01-05 | Full-hydraulic internal cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810010480.8A CN107956445B (en) | 2018-01-05 | 2018-01-05 | Full-hydraulic internal cutting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107956445A CN107956445A (en) | 2018-04-24 |
| CN107956445B true CN107956445B (en) | 2023-11-10 |
Family
ID=61956145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810010480.8A Active CN107956445B (en) | 2018-01-05 | 2018-01-05 | Full-hydraulic internal cutting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107956445B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110552646B (en) * | 2019-09-19 | 2020-05-05 | 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 | Rotary hydraulic jet cutting casing tool and construction method thereof |
| CN114434337B (en) * | 2020-11-03 | 2023-07-04 | 中国海洋石油集团有限公司 | Hydraulic cutter guiding device and guiding method thereof |
| CN112780208B (en) * | 2021-01-06 | 2021-10-26 | 中国矿业大学 | Gas extraction drilling fault-breaking deformation area repairing system and repairing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791409A (en) * | 1996-09-09 | 1998-08-11 | Baker Hughes Incorporated | Hydro-mechanical multi-string cutter |
| CN102003146A (en) * | 2010-11-04 | 2011-04-06 | 中国石油天然气集团公司 | Full-hydraulic reamer |
| CN102747977A (en) * | 2012-07-20 | 2012-10-24 | 长江大学 | Internal cutting device of hydraulic sleeve |
| CN204386532U (en) * | 2015-01-07 | 2015-06-10 | 长江大学 | A kind of pressure release type deep water casing internal cutting device |
| CN206205843U (en) * | 2016-11-11 | 2017-05-31 | 朱海东 | Hydraulic water power formula internal cutter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7775302B2 (en) * | 2008-08-01 | 2010-08-17 | Tesco Corporation | Casing shoe and retrievable bit assembly |
-
2018
- 2018-01-05 CN CN201810010480.8A patent/CN107956445B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791409A (en) * | 1996-09-09 | 1998-08-11 | Baker Hughes Incorporated | Hydro-mechanical multi-string cutter |
| CN102003146A (en) * | 2010-11-04 | 2011-04-06 | 中国石油天然气集团公司 | Full-hydraulic reamer |
| CN102747977A (en) * | 2012-07-20 | 2012-10-24 | 长江大学 | Internal cutting device of hydraulic sleeve |
| CN204386532U (en) * | 2015-01-07 | 2015-06-10 | 长江大学 | A kind of pressure release type deep water casing internal cutting device |
| CN206205843U (en) * | 2016-11-11 | 2017-05-31 | 朱海东 | Hydraulic water power formula internal cutter |
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| Publication number | Publication date |
|---|---|
| CN107956445A (en) | 2018-04-24 |
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