CN109681144B - Integrated deep sea sleeve cutting and salvaging device - Google Patents
Integrated deep sea sleeve cutting and salvaging device Download PDFInfo
- Publication number
- CN109681144B CN109681144B CN201910116970.0A CN201910116970A CN109681144B CN 109681144 B CN109681144 B CN 109681144B CN 201910116970 A CN201910116970 A CN 201910116970A CN 109681144 B CN109681144 B CN 109681144B
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- shell
- rotating shaft
- mandrel
- piston
- hole
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- 230000000903 blocking effect Effects 0.000 claims description 18
- 238000005553 drilling Methods 0.000 abstract description 23
- 239000012530 fluid Substances 0.000 abstract description 23
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 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
- E21B31/16—Grappling tools, e.g. tongs or grabs combined with cutting or destroying means
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
-
- 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
- E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
- E21B29/005—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window
-
- 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)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a cutting and salvaging device, in particular to an integrated deep sea sleeve cutting and salvaging device. The device consists of a shell, clamping pieces, a rotating shaft and a mandrel, wherein the rotating shaft is movably arranged in the shell through symmetrically-arranged thrust bearings, one end of the rotating shaft extends to the outer end of the shell, the mandrel is movably sleeved in the rotating shaft, cutters are symmetrically arranged on the rotating shaft extending to the outer end of the shell through springs and assembly holes, the cutters are in sliding contact connection with the mandrel, flow passages are symmetrically arranged on the shell above the mandrel, and the clamping pieces are arranged in the flow passages; a shutoff valve is arranged in the flow passage above the clamping piece. The rotary shaft is utilized to drive the cutter to rotate so as to realize cutting of the sleeve; pushing the clamping piece to clamp the sleeve by using the pressure of drilling fluid; judging whether to cut the casing according to the pressure change of the drilling fluid so as to carry out fishing work; the problems of complex operation, difficult judgment of the cutting condition of the sleeve and complicated cutting and salvaging existing in the existing equipment are solved, and the requirement of ocean well abandoning operation is met.
Description
Technical Field
The invention relates to a cutting and salvaging device, in particular to an integrated deep sea sleeve cutting and salvaging device.
Background
Currently, about seven thousands of offshore platforms exist worldwide, wherein one quarter of the offshore platforms are built for more than 30 years, as more and more offshore oil fields enter the middle and later stages of exploitation, the number of newly built platforms in part of the areas per year is basically equal to the number of abandoned platforms, and old platforms losing exploitation value need to be well-sealed and well-abandoned further so as to meet the requirements of ocean environmental protection engineering.
When the well abandoning operation enters the ending stage, the sleeve needs to be cut to recover the wellhead head; when the sleeve is dismantled, the conventional equipment is difficult to judge whether the sleeve is cut off or not, the normal operation of subsequent work is influenced, if the sleeve is fished in a trade when the sleeve is not cut off, the sleeve cannot be taken out, even underground accidents such as a pull-off salvaging tool and the like occur, and great potential safety hazards exist; in addition, the casing pipe is cut and then the other equipment is required to be additionally replaced for salvaging, so that the working procedure is complicated, the well abandoning operation time is prolonged, the efficiency is low, and the salvaging cost is also improved, and therefore, a novel cutting salvaging device is required to solve the defects.
Disclosure of Invention
The invention aims at: the integrated deep sea sleeve cutting and salvaging device is simple to operate, easy to judge sleeve cutting conditions, and integrated in cutting and salvaging, and solves the problems that existing equipment is complex in operation, difficult to judge sleeve cutting conditions and complex in cutting and salvaging.
The technical scheme of the invention is as follows:
the utility model provides an integral type deep sea sleeve pipe cutting fishing device, it comprises casing, chucking spare, pivot and mandrel, its characterized in that: a rotating shaft is movably arranged in the shell through symmetrically-shaped thrust bearings, one end of the rotating shaft extends to the outer end of the shell, a mandrel is movably sleeved in the rotating shaft, a cutter is symmetrically arranged on the rotating shaft extending to the outer end of the shell through a spring and an assembly hole, the cutter is in sliding contact connection with the mandrel, a runner is symmetrically arranged on the shell above the mandrel, and clamping pieces are arranged in the runner; a shutoff valve is arranged in the flow passage above the clamping piece.
The turbine assembly is arranged on the rotating shaft between the thrust bearings and the inner wall of the shell, drain holes are symmetrically formed in the shell below the thrust bearings, and limiting rings are arranged on the inner threads of the shell above the drain holes.
One end of the mandrel extends to the outer end of the rotating shaft, a mandrel flange is arranged at the top of the mandrel extending to the outer end of the rotating shaft, a supporting spring is sleeved on the mandrel below the mandrel flange, one end of the supporting spring is in contact connection with the mandrel flange, and the other end of the supporting spring is in contact connection with the end face of the rotating shaft.
The shell be the tubulose, the hole of shell is the reducing hole, the symmetry form is provided with the relief hole on the casing of runner top, the relief hole is the through-hole, the relief hole is the zigzag, is provided with the relief valve in the relief hole.
And a plugging flange is arranged on the inner wall of the shell below the mandrel flange.
The clamping piece comprises a piston, a clamping plug and a clamping knife, wherein the piston is in a T shape, the piston is movably arranged in the flow channel through a spring, the clamping plug is arranged on the shell on one side of the piston through an assembly hole and the spring, one end of the clamping plug extends out of the shell, one end of the clamping plug extending out of the shell is provided with a pull ring, the clamping plug is connected with the piston in a sliding contact manner, a clamping groove is formed in the piston above the clamping plug, the clamping knife is arranged in the flow channel below the piston through the assembly hole and the spring, one end of the clamping knife extends out of the shell, the clamping knife is connected with the piston in a sliding contact manner, and the joint of the clamping knife and the piston is a slope.
The mandrel is characterized in that the bottom of the mandrel is provided with a waisted push head, the cutter is nail-shaped, the top end of the cutter is provided with a spherical bulge, and the mandrel is connected with the cutter in sliding contact through the cooperation of the push head and the spherical bulge.
The invention has the advantages that:
the integrated deep sea sleeve cutting and salvaging device has the characteristics of simplicity in operation, easiness in judging sleeve cutting condition, cutting and salvaging integration: the spindle drives the cutter to rotate to cut the sleeve, and the mandrel pushes the cutter to progressively cut the sleeve; pushing the clamping piece to clamp the sleeve by using the pressure of drilling fluid; in the working process, whether the sleeve is cut and clamped or not can be judged according to the detected drilling fluid pressure change so as to further carry out salvage work; the problems of complex operation, difficult judgment of the cutting condition of the sleeve and complicated cutting and salvaging existing in the existing equipment are solved, and the requirement of ocean well abandoning operation is met.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged partial schematic view at A in FIG. 1;
fig. 3 is a schematic diagram of the operation of the present invention.
In the figure: 1. the device comprises a shell, 2, clamping pieces, 3, a rotating shaft, 4, a mandrel, 5, a pressure relief hole, 6, a pressure relief valve, 7, a pressure relief hole, 8, a blocking flange, 9, a limiting ring, 10, a piston, 11, a clamping plug, 12, a clamping knife, 13, a runner, 14, a blocking valve, 15, a pull ring, 16, a turbine component, 17, a cutter, 18, a mandrel flange, 19, a thrust bearing, 20, a clamping groove, 21, a workpiece, 22, a push head, 23 and a supporting spring.
Detailed Description
The integrated deep sea casing pipe cutting and salvaging device is composed of a casing 1, a clamping piece 2, a rotating shaft 3 and a mandrel 4, wherein the casing 1 is tubular, an inner hole of the casing 1 is a reducing hole, pressure relief holes 5 are symmetrically formed in the top end of the casing 1, the pressure relief holes 5 are through holes, the pressure relief holes 5 are communicated with the inner hole of the casing 1, the pressure relief holes 5 are used for enabling the inside and the outside of the casing 1 to be communicated, pressure relief valves 6 are arranged in the pressure relief holes 5, and the pressure relief valves 6 are opened when the pressure in the casing 1 is too high so as to balance the pressure of drilling fluid; the bottom of the shell 1 is symmetrically provided with a drain hole 7, the drain hole 7 is a through hole, the drain hole 7 is communicated with an inner hole of the shell 1, and the drain hole 7 is used for discharging drilling fluid in the shell 1.
The casing 1 between the pressure relief hole 5 and the pressure relief hole 7 is movably sleeved with a rotating shaft 3 through symmetrically arranged thrust bearings 19, the rotating shaft 3 is in a convex shape, the rotating shaft 3 between the thrust bearings 19 and the casing 1 are fixedly provided with a turbine component 16, the turbine component 16 consists of a turbine rotor and a turbine stator, the turbine rotor is fixedly arranged on the rotating shaft 3, the turbine stator is fixedly arranged on the casing 1, and when drilling fluid flows through the turbine component 16, the turbine component 16 drives the rotating shaft 3 to continuously rotate under the impact of the drilling fluid; one end of the rotating shaft 3 extends out of the shell 1, cutters 17 are symmetrically arranged in the rotating shaft 3 extending out of the shell 1, the cutters 17 are in nail shapes, the cutters 17 are movably arranged on the rotating shaft 3 through springs and assembly holes, one end of each cutter 17 extends out of the rotating shaft 3, spherical protrusions are arranged at the other end of each cutter 17, and the cutters 17 are used for rotating along with the rotating shaft 3 to cut a workpiece 21 (petroleum casing pipe).
The spindle 4 is movably sleeved in the rotating shaft 3, the top end of the spindle 4 extends out of the rotating shaft 3, a spindle flange 18 is arranged at one end of the spindle 4 extending out of the rotating shaft 3, a supporting spring 23 is sleeved on the spindle 4 below the spindle flange 18, one end of the supporting spring 23 is in contact connection with the spindle flange 18, and the other end of the supporting spring 23 is in contact connection with the end face of the rotating shaft 3. The lower end of the mandrel 4 is provided with a push head 22, the push head 22 is in a waisted shape, the push head 22 is in sliding fit with one end of the spherical bulge of the cutter 17, the push head 22 is used for pushing the cutter 17 outwards to enable the cutter 17 to be unfolded radially, and therefore the cutter 17 gradually penetrates into the workpiece 21, and progressive cutting of the workpiece 21 is achieved.
The casing 1 below the mandrel flange 18 is internally provided with a blocking flange 8, the blocking flange 8 is used for limiting the mandrel 4, and meanwhile, the blocking flange 8 is matched with the mandrel flange 18 to realize sealing blocking of a central hole of the casing 1, so that drilling fluid cannot flow downwards along the drain hole 7, the pressure in the casing 1 is increased, a limiting ring 9 is arranged in the casing 1 between the blocking flange 8 and the drain hole 7 through internal threads, and the limiting ring 9 is used for preventing components in the casing 1 from falling off and axially limiting the thrust bearing 19.
The shell 1 above the plugging flange 8 is symmetrically provided with a flow channel 13, one end in the flow channel 13 is provided with a clamping piece 2, the clamping piece 2 is used for clamping a workpiece 21, the clamping piece 2 is composed of a piston 10, a clamping plug 11 and a clamping knife 12, the piston 10 is movably arranged in the flow channel 13 through a spring, the piston 10 is T-shaped, the shell 1 on one side of the piston 10 is provided with the clamping plug 11 through an assembly hole and the spring, the clamping plug 11 is T-shaped, one end of the clamping plug 11 extends out of the shell 1, the end of the clamping plug 11 extending out of the shell 1 is provided with a pull ring 15, and the pull ring 15 is used for withdrawing the clamping plug 11 from a clamping groove 20 after the work is finished so as to carry out the next work; the clamping plug 11 is connected with the piston 10 in a sliding contact manner, a clamping groove 20 is formed in the piston 10 above the clamping plug 11 and corresponds to the clamping plug 11, a clamping knife 12 is arranged in a flow channel 13 below the piston 10 through an assembly hole and a spring, one end of the clamping knife 12 extends to the outer end of the shell 1, the clamping knife 12 is connected with the piston 10 in a sliding contact manner, and the joint of the clamping knife 12 and the piston 10 is respectively a slope. In operation, the clamping tool 12 is pushed by the piston 10 to extend out of the housing 1, thereby clamping the workpiece 21.
The other end in the flow passage 13 is provided with a shutoff valve 14, and the pressure threshold value of the shutoff valve 14 is smaller than that of the pressure relief valve 6, so that the high-pressure drilling fluid pushes the piston 10 to work before being discharged out of the shell 1. The blocking valve 14 and the pressure release valve 6 are respectively composed of a spring and a blocking ball, and the end head of the spring is fixedly provided with the blocking ball.
The working process of the salvaging device is as follows: the device is lowered to a designated cutting position in the workpiece 21, drilling fluid is injected into an inner hole of the shell 1 from the top end of the shell 1, the drilling fluid flows through the turbine assembly 16 and flows out along the drain hole 7, in the process, the drilling fluid pushes the turbine assembly 16 to rotate, the turbine assembly 16 drives the rotating shaft 3 to rotate, the rotating shaft 3 drives the cutter 17 to rotate, meanwhile, the mandrel 4 moves downwards under the pressure of the drilling fluid, and then the cutter 17 is pushed to radially spread through the push head 22 and contact with the inner wall of the workpiece 21, so that progressive cutting of the cutter 17 on the workpiece 21 is realized until the workpiece 21 is completely cut off.
When the cutter 17 cuts off the workpiece 21 completely, the workpiece 21 does not generate resistance to the cutter 17 any more, the cutter 17 does not generate resistance to the mandrel 4, the mandrel 4 moves downwards to a limit distance under the action of drilling fluid, meanwhile, the mandrel flange 18 at the upper end of the mandrel 4 is tightly attached to the blocking flange 8, the drilling fluid cannot flow downwards through the drain hole 7 due to the blocking of the mandrel flange 18 and the blocking flange 8, the drilling fluid continuously enters the shell 1, so that the pressure in the shell 1 gradually rises, when the pressure in the shell 1 exceeds the threshold value of the blocking valve 14, the blocking valve 14 is opened under the pressure, the drilling fluid enters the runner 13 and pushes the piston 10 to move downwards, and the slope surface at the bottom end of the piston 10 presses the blocking knife 12 to enable the blocking knife 12 to extend outwards of the shell 1;
in the process that drilling fluid pushes the clamping piece 2 to work, the pressure in the shell is still lower than the threshold value of the pressure relief valve 6, after the piston 10 moves downwards for a certain distance, the clamping plug 11 is clamped into the clamping groove 20 of the piston 10 under the action of the spring to lock the piston 10, so that the piston 10 cannot move up and down, meanwhile, the clamping knife 12 extending out of the shell 1 is tightly attached to the inner wall of the workpiece 21, so that the workpiece 21 cannot move relative to the clamping knife 12, and the corresponding clamping knife 12 cannot move, so that the workpiece 21 is stably clamped, and the piston 10 stops moving, so that the drilling fluid continuously enters the shell 1 to enable the pressure to rise again until the threshold value of the pressure relief valve 6 is exceeded, the pressure relief valve 6 is opened under high pressure, the drilling fluid flows out along the pressure relief hole 5, and the pressure in the shell 1 falls below the threshold value of the pressure relief valve 6; during this process, the pressure in the housing 1 is continuously monitored by the personnel on the well by means of the instrument, and if the pressure changes in conformity with the above process, this indicates that the work piece 21 has completed cutting and is completely clamped by the clamping tool 12.
After confirming that the workpiece 21 is cut and clamped, stopping pumping by a worker on the well, stopping entering drilling fluid into the shell 1 after stopping pumping, reducing pressure in the shell 1, resetting the mandrel 4 under the action of the supporting spring 23, and resetting the cutter 17 under the action of the spring due to resetting of the push head 22 along with the mandrel 4, wherein the cutter 17 is not damaged in the fishing process; because the clamping knife 12 clamps the workpiece 21, a worker can directly salvage the workpiece 21 by using the device; after the fishing operation is finished, the workpiece 21 is removed from the device by using an auxiliary tool, the pull ring 15 on the clamping plug 11 is pulled open, the clamping plug 11 is retracted into the clamping groove 20, and the piston 10 and the clamping knife 12 are respectively returned to the original positions under the action of the spring so as to prepare for the next cutting and fishing operation.
This fishing device utilizes pivot 3 to drive the rotatory cutting of cutter 17 realization to work piece 21, and automatic fixed in order to salvage after the cutting, saved the operation of changing salvage equipment, simplified the work link, and improved the operating efficiency, and at the in-process of cutting and salvaging, ground staff can judge whether have cut open and blocked work piece 21 according to the drilling fluid pressure change that detects, prevent that the trade salvages and produce the damage to the device and arouse the incident, the complex operation that has solved current equipment and has had, be difficult to judge the cutting condition of sheathed tube and the loaded down with trivial details problem of cutting salvage, the needs of ocean well abandoning operation have been satisfied.
Claims (4)
1. The utility model provides an integral type deep sea sleeve pipe cutting fishing device, it comprises casing (1), chucking spare (2), pivot (3) and mandrel (4), its characterized in that: a rotating shaft (3) is movably arranged in the shell (1) through symmetrically arranged thrust bearings (19), one end of the rotating shaft (3) extends to the outer end of the shell (1), a mandrel (4) is movably sleeved in the rotating shaft (3), a cutter (17) is symmetrically arranged on the rotating shaft (3) extending to the outer end of the shell (1) through a spring and an assembly hole, the cutter (17) is in sliding contact connection with the mandrel (4), a runner (13) is symmetrically arranged on the shell (1) above the mandrel (4), and a clamping piece (2) is arranged in the runner (13); a shutoff valve (14) is arranged in the flow passage (13) above the clamping piece (2);
the turbine assembly (16) is arranged on the rotating shaft (3) between the thrust bearings (19) and the inner wall of the shell (1), the shell (1) below the thrust bearings (19) is symmetrically provided with the drain holes (7), and the limiting ring (9) is arranged on the inner thread of the shell (1) above the drain holes (7);
one end of the spindle (4) extends to the outer end of the rotating shaft (3), a spindle flange (18) is arranged at the top of the spindle (4) extending to the outer end of the rotating shaft (3), a supporting spring (23) is sleeved on the spindle (4) below the spindle flange (18), one end of the supporting spring (23) is in contact connection with the spindle flange (18), and the other end of the supporting spring (23) is in contact connection with the end face of the rotating shaft (3);
the clamping piece (2) constitute by piston (10), card stopper (11) and card sword (12), piston (10) are the T font, piston (10) are equipped with card sword (12) through spring movable mounting in runner (13), be equipped with card stopper (11) through mounting hole and spring on casing (1) of piston (10) one side, the one end of card stopper (11) extends to outside casing (1), the one end that card stopper (11) extends to outside casing (1) is provided with pull ring (15), be provided with draw-in groove (20) on card stopper (11) and piston (10) sliding contact connection, be equipped with card sword (12) through mounting hole and spring in runner (13) of card stopper (11) top, the one end of card sword (12) extends to casing (1) outer end, card sword (12) are slope with piston (10) sliding contact connection respectively, the junction of card sword (12) and piston (10).
2. The integrated deep sea casing cutting fishing device of claim 1, wherein: the shell (1) be tubulose, the hole of shell (1) is the reducing hole, symmetrically form is provided with relief hole (5) on the shell (1) of runner (13) top, relief hole (5) are the through-hole, relief hole (5) are the zigzag, be provided with relief valve (6) in relief hole (5).
3. The integrated deep sea casing cutting fishing device of claim 1, wherein: the inner wall of the shell (1) below the mandrel flange (18) is provided with a blocking flange (8).
4. The integrated deep sea casing cutting fishing device of claim 1, wherein: the bottom of the mandrel (4) is provided with a waisted push head (22), the cutter (17) is nail-shaped, the top end of the cutter (17) is provided with a spherical bulge, and the mandrel (4) is connected with the cutter (17) in sliding contact through the cooperation of the push head (22) and the spherical bulge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910116970.0A CN109681144B (en) | 2019-02-15 | 2019-02-15 | Integrated deep sea sleeve cutting and salvaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910116970.0A CN109681144B (en) | 2019-02-15 | 2019-02-15 | Integrated deep sea sleeve cutting and salvaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109681144A CN109681144A (en) | 2019-04-26 |
| CN109681144B true CN109681144B (en) | 2023-09-19 |
Family
ID=66195956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910116970.0A Active CN109681144B (en) | 2019-02-15 | 2019-02-15 | Integrated deep sea sleeve cutting and salvaging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109681144B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946286B (en) * | 2020-09-09 | 2022-11-15 | 新疆华油油气工程有限公司 | Lifting rotary reversing tool |
| CN112610176B (en) * | 2021-01-14 | 2022-08-05 | 长江大学 | Construction process for recovering abandoned well casing |
| CN113982512B (en) * | 2021-10-26 | 2024-05-07 | 长江大学 | Decompression method and device for bypass valve of screw drilling tool |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201439694U (en) * | 2009-07-03 | 2010-04-21 | 大港油田集团有限责任公司 | Taking and changing sleeve cutting salvage device |
| CN202745782U (en) * | 2012-07-20 | 2013-02-20 | 长江大学 | Internal cutting device of hydraulic sleeve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10458196B2 (en) * | 2017-03-09 | 2019-10-29 | Weatherford Technology Holdings, Llc | Downhole casing pulling tool |
-
2019
- 2019-02-15 CN CN201910116970.0A patent/CN109681144B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201439694U (en) * | 2009-07-03 | 2010-04-21 | 大港油田集团有限责任公司 | Taking and changing sleeve cutting salvage device |
| CN202745782U (en) * | 2012-07-20 | 2013-02-20 | 长江大学 | Internal cutting device of hydraulic sleeve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109681144A (en) | 2019-04-26 |
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