CN112324377A - Downhole operation tool and operation method for deep-sea drillless permanent abandoned well - Google Patents
Downhole operation tool and operation method for deep-sea drillless permanent abandoned well Download PDFInfo
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- CN112324377A CN112324377A CN202011337431.9A CN202011337431A CN112324377A CN 112324377 A CN112324377 A CN 112324377A CN 202011337431 A CN202011337431 A CN 202011337431A CN 112324377 A CN112324377 A CN 112324377A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 138
- 239000007924 injection Substances 0.000 claims abstract description 138
- 239000004568 cement Substances 0.000 claims abstract description 71
- 238000005520 cutting process Methods 0.000 claims abstract description 61
- 238000004873 anchoring Methods 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 41
- 210000000078 claw Anatomy 0.000 claims abstract description 18
- 238000012856 packing Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 30
- 238000004891 communication Methods 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 238000010008 shearing Methods 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 230000015271 coagulation Effects 0.000 claims description 16
- 238000005345 coagulation Methods 0.000 claims description 16
- 238000005488 sandblasting Methods 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 238000005192 partition Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241000191291 Abies alba Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 101000623895 Bos taurus Mucin-15 Proteins 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
- 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
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to the technical field of ocean engineering, in particular to an underground operation tool and an operation method for a deep-sea drillless permanent abandoned well, which comprise an injection assembly, a packing assembly, a jet assembly, an anchoring assembly I, a rotary cutting assembly, an anchoring assembly II and a continuous oil pipe, wherein the injection assembly, the packing assembly, the jet assembly, the anchoring assembly I, the rotary cutting assembly, the anchoring assembly II and the continuous oil pipe are sequentially connected at the head; the invention solves the problems of more construction procedures, long operation time, high cost, complex operation, high operation cost and the like in the prior art, completes the perforation operation of the production oil pipe through the injection assembly, and opens the pore channel between the oil sleeve annulus and the inner cavity of the production oil pipe; the annular cutting operation of the pipe wall of the production oil pipe is completed through the rotary cutting assembly; the positioning and the partition interval are strengthened through the outward-expanding structure, the anchoring claw also plays a role in positioning and reinforcing, and the underground operation tool for the deep-sea drillless permanent abandoned well can be completed by three steps of cement squeezing operation, so that the operation time is greatly shortened, the operation time and the cost are reduced, the operation is flexible, and the operation cost is low.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to an underground operation tool and an operation method for deep-sea drillless permanent abandoned wells.
Background
The marine well abandoning operation can be divided into well abandoning operation of a drilling ship and well abandoning operation without the drilling ship according to whether the drilling ship or other mobile drilling devices are used in the well abandoning operation. The conventional offshore deep water well abandoning operation usually adopts a drilling ship to operate, the used facilities are mainly the drilling ship, the drilling ship is provided with a corresponding drilling rig, a winch and various auxiliary facilities, and underground facilities such as oil pipes, casings and the like can be taken out in the well abandoning operation. The well abandoning operation without the drilling ship adopts a specially designed engineering ship and various special overwater and underwater devices to carry out the well abandoning operation, compared with the operation of the drilling ship, an oil pipe in the well does not need to be taken out, and the engineering ship does not have a large-scale drill frame, so the size of the ship body is much smaller, and the operation cost is lower. As no drilling ship is needed for operation and a drilling ship with scarce resources is not needed to be used, and the economic benefit is obvious, the technology is rapidly developed abroad in recent years and is widely applied to ocean deep water well abandoning operation and various well repairing operations. At present, the application of the technology in China is still blank, and with the increase of the development strength of marine oil and gas resources in China, the operation quantity of various well abandoning, well repairing and production increasing measures is increased continuously, and by adopting the technology, the scarce deep platform resources in China can be saved, and the technology has great economic benefit.
In the conventional drilling machine-free marine abandoned well operation, a steel wire is used as a medium to put in a bridge plug, a perforation and a cutting tool, different tools are required to be connected to pull out and put out the steel wire rope once in each operation, the construction procedures are more, the cutting of an oil pipe adopts physical cutting, and the subsequent recovery and treatment are more troublesome; the steel wire rope is used as a medium, and a circulation channel needs to be established through an underwater control system, a Christmas tree, a counterweight system and the like. And after each working procedure is finished, a downhole tool needs to be obtained next time, and the tools are transferred at least seven times in the whole well abandoning process, so that the operation time is long and the cost is high. The well abandoning operation without the drilling machine has the advantages that the coiled tubing is used as a medium, the operation is more flexible, and the operation cost is lower.
Disclosure of Invention
The invention mainly aims to provide an underground operation tool and an operation method for a deep-sea drillless permanent abandoned well, and aims to solve the problems of more construction procedures, long operation time, high cost, complex operation, high operation cost and the like in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a downhole operation tool for a deep-sea drillless permanent abandoned well is mounted at the tail end of a coiled tubing for use and comprises an injection assembly, a packing assembly, a jet assembly, an anchoring assembly I, a rotary cutting assembly and an anchoring assembly II which are sequentially connected from head to head; the upper part of the injection assembly is connected with a continuous oil pipe, and injection passages which are communicated with each other are arranged in the injection assembly, the packing assembly, the injection assembly, the anchoring assembly I, the rotary cutting assembly and the anchoring assembly II; the continuous oil pipe is communicated with the injection channel;
the injection assembly comprises an injection nozzle body, one end of the injection nozzle body is provided with an injection opening, and a ball seat I is arranged in the injection nozzle body;
the packer assembly comprises a packer body and an outward expansion structure connected to the separator body;
the injection assembly comprises an injection short-circuit body, a communication hole is formed in the side wall of the injection short-circuit body, a nozzle is installed in the communication hole, a shearing pin I is arranged in an injection channel of the injection assembly, a sliding sleeve I is further arranged in the injection channel of the injection assembly, the sliding sleeve I is located above the shearing pin I, and the communication hole in the side wall of the injection short-circuit body is plugged by the sliding sleeve I;
the anchoring component I and the anchoring component II respectively comprise anchoring bodies, communication holes are formed in the side walls of the anchoring bodies, anchoring claws are mounted in the communication holes, the claw directions of the anchoring claws face outwards, and ball seats II are formed in injection channels of the anchoring components I;
the rotary cutting assembly comprises an upper joint, an outer cylinder, an inner cylinder, a lower joint and a cutting nozzle, the upper joint and the lower joint are connected through the inner cylinder, two ends of the outer cylinder are respectively and rotatably connected to the upper joint and the lower joint, a cavity is arranged between the outer cylinder and the inner cylinder, communication holes are formed in the inner cylinder and the outer cylinder, the communication holes in the outer cylinder deflect for a certain angle, and the cutting nozzle is installed in the communication hole in the outer cylinder; the injection passage of the rotary cutting assembly is internally provided with a shearing pin II, the sliding sleeve II is arranged in the injection passage of the rotary cutting assembly, the bottom of the sliding sleeve II is propped against the shearing pin II, and the sliding sleeve II blocks the communicating hole on the side wall of the inner cylinder.
Further, bearings are arranged between the outer barrel and the upper joint and between the outer barrel and the lower joint.
Further, the injection port is trumpet-shaped.
Furthermore, the diameter of an injection channel between the ball seat II and the ball seat I is smaller than that of the injection channel above the ball seat II.
Furthermore, the inner diameter of the ball seat II is smaller than that of the sliding sleeve II, and the inner diameter of the ball seat I is smaller than that of the sliding sleeve I.
Furthermore, the external expanding structure is a rubber structure.
Furthermore, injection subassembly one end has the connection internal thread, and coiled tubing one end has the connection external screw thread, seals and separates subassembly, injection subassembly, anchoring subassembly I, rotatory cutting subassembly and II homogeneous ends of anchoring subassembly have the connection internal thread, and the other end has the connection external screw thread, from the bottom up, injection subassembly, seals and separates subassembly, injection subassembly, anchoring subassembly, rotatory cutting subassembly, anchoring subassembly II and coiled tubing threaded connection in proper order.
A method of operation using the downhole tool described above, comprising the steps of:
s1: the underground operation tool is put into a production oil pipe through a continuous oil pipe, high-pressure cement slurry is pumped into an injection channel through the continuous oil pipe, the outward-expanding structure is expanded under the action of pressure, and the anchoring claw is in an anchoring state under the action of pressure in the pipe;
s2: the cement paste is squeezed into the stratum through the bottom injection port under the action of high pressure; stopping the pump after the length of the squeezed cement plug meets the requirement, lifting the operation tool for waiting coagulation, injecting liquid into the ground for pressure test after waiting coagulation is finished, applying pressure through a continuous oil pipe injection head, detecting the top surface strength of the side, and finishing the sealing of the first section of cement plug after the strength is qualified;
s3: lifting the position of a second section of cement plug on the operation tool, putting a steel ball I into the operation tool, increasing the pump injection pressure, breaking through the shear pin I by the sliding sleeve I under the action of the pressure in the injection channel, and dropping the sliding sleeve I into the position of the ball seat I, wherein the communication hole in the side wall of the injection assembly is opened at the moment; pumping high-pressure sand-blasting liquid into the injection channel, wherein the high-pressure sand-blasting liquid is sprayed out from the nozzle to puncture the pipe wall of the production oil pipe, and a punching hole is formed on the pipe wall of the production oil pipe, and the outward-expanding structure and the anchoring claw are also in a working state under the action of pressure in the process;
s4: pumping cement slurry pre-positioned liquid into the injection channel, isolating the first section of cement plug from the second section of cement plug through the pre-positioned liquid, injecting the second section of cement plug, injecting the cement plug into the inner cavity of the production oil pipe, and further entering the space of an oil sleeve ring between the production oil pipe and the sleeve pipe from the breakdown hole, after the injection is finished, lifting the continuous oil pipe for waiting for coagulation, after the coagulation is finished, testing the pressure and probing the top surface of the cement plug, and finishing the sealing of the second section of cement plug after the cement plug is qualified;
s5: lifting the operation tool to the position of a third section of cement plug, putting a steel ball II, improving the pressure of pump injection, breaking a shearing pin II by a sliding sleeve II under the action of pressure in an injection channel, dropping the shearing pin II into the position of a ball seat II of an anchoring assembly I, opening a communication hole in the side wall of an inner cylinder, pumping high-pressure sand-blasting liquid into the injection channel, spraying the high-pressure sand-blasting liquid out of a cutting nozzle, cutting a pipe column to be cut by means of jet impact force, forming a certain torque on the outer cylinder by the reaction force of the jet impact force, rotating the outer cylinder relative to the inner cylinder due to the fact that the outer cylinder is connected with the inner cylinder through a bearing, realizing the cutting of a production oil pipe, and forming an annular notch on the production oil pipe, wherein an external expanding structure and an anchoring claw are; and after the cutting is finished, taking out the upper production oil pipe after the cutting.
S6: pumping cement slurry pre-posed liquid into the injection channel, isolating the second section of cement plug from the third section of cement plug through the pre-posed liquid, injecting the third section of cement plug inwards, filling the whole shaft inner cavity of the target well section with the cement plug at the moment, finishing the extrusion after the length of the extruded cement plug meets the requirement, lifting an operation tool for waiting for coagulation, testing the pressure and probing the top surface of the cement plug after the coagulation is finished, and finishing the sealing of the third section of cement plug after the pressure testing is qualified;
s7: and finally, recovering the wellhead device to complete the whole well abandoning process.
The invention has the following beneficial effects:
(1) the underground operation tool is provided with the injection assembly, the nozzle is plugged through the sliding sleeve I, the sliding sleeve I is driven by the steel ball I to fall down, the opening of the nozzle is controlled, the pipe wall of an oil pipe is punctured through the nozzle, and a cement plug is squeezed into an annular space between a production oil pipe and a casing pipe from the position of a punching hole, so that the controllability is strong, the pipe wall of the oil pipe can be punctured at any proper height according to actual requirements to inject the cement plug, and the controllability is strong;
(2) the underground operation tool is provided with a rotary cutting assembly, a sliding sleeve II can be controlled through a steel ball II, an inner cylinder communicating hole of the rotary cutting assembly is opened, a communicating hole on an outer cylinder deflects for a certain angle, high-pressure sand blasting liquid is pumped into an injection channel, the high-pressure sand blasting liquid is sprayed out from a nozzle, a pipe column to be cut is cut by means of jet impact force, meanwhile, the outer cylinder rotates relative to the inner cylinder through the reaction force of the jet impact force, the cutting of a production oil pipe is achieved, and an annular notch is formed in the pipe wall of the production oil pipe;
(3) by using the underground operation tool, three cement injection operations are required to complete the operation, the operation time is greatly shortened, the operation time and the cost are reduced, the operation is flexible, and the operation cost is low.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of an inject assembly;
FIG. 3 is a schematic view of a packing assembly;
FIG. 4 is a schematic view of a spray assembly construction;
FIG. 5 is a schematic view of the nozzle position;
FIG. 6 is a schematic structural view of an anchor assembly I;
FIG. 7 is a schematic view of a rotary cutting assembly;
FIG. 8 is a schematic view of a cutting nozzle distribution;
FIG. 9 is a schematic structural view of an anchor assembly II;
FIG. 10 is a schematic view of the initial position of the sliding sleeve I and the sliding sleeve II and the squeezing state;
FIG. 11 is a schematic diagram of the positions of a sliding sleeve I and a sliding sleeve II and the extrusion state after a steel ball I is put into the sliding sleeve I;
FIG. 12 is a schematic diagram showing the positions of the sliding sleeve I and the sliding sleeve II and the squeezing state after the steel ball II is put into the sliding sleeve I and the sliding sleeve II;
in the figure: 1. an injection assembly; 11. an injection nozzle body; 12. a ball seat I; 13. an injection port; 2. a packing assembly; 21. a packer body; 22. an outward expansion structure; 3. a spray assembly; 31. jetting a short-circuit body; 32. a nozzle; 33. shearing a pin I; 4. an anchor assembly I; 41. an anchor body; 42. anchoring the paw teeth; 43. a ball seat II; 5. a rotary cutting assembly; 51. an upper joint; 52. an outer cylinder; 53. an inner barrel; 54. a lower joint; 55. cutting the nozzle; 56. shearing a pin II; 6. an anchor assembly II; 7. a coiled tubing; 8. a sliding sleeve II; 9. a sliding sleeve I; 10. a steel ball I; 101. a steel ball II; 102. producing an oil pipe; 103. a sleeve; 104. and an oil sleeve annulus packer.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1-9, the downhole operation tool for deep-sea drillless permanent well abandonment comprises an injection assembly 1, a packing assembly 2, a jetting assembly 3, an anchoring assembly I4, a rotary cutting assembly 5, an anchoring assembly II 6 and a coiled tubing 7 which are connected in sequence from head to head; the injection assembly 1, the packing assembly 2, the injection assembly 3, the anchoring assembly I4, the rotary cutting assembly 5, the anchoring assembly II 6 and the coiled tubing 7 are internally provided with injection channels which are communicated with each other.
As shown in fig. 2, the injection assembly 1 comprises an injection nozzle body, one end of the injection nozzle body is provided with an injection port 13, the injection port is in a horn shape, and a ball seat i 12 is arranged in the injection nozzle body; the filling nozzle body is connected with the packing component through threads.
As shown in FIG. 3, the packing assembly includes a packer body 21 and a flaring structure 22 attached to the packer body; the outer expanding structure is a rubber structure and can be expanded outwards under the action of smaller water pressure, so that the sealing of a cavity between the operation tool and the production oil pipe is realized.
As shown in fig. 4 and 5, the injection assembly comprises an injection short-circuit body 31, a communication hole is formed in the side wall of the injection short-circuit body, a nozzle 32 is detachably mounted in the communication hole, a shearing pin i 33 is arranged in an injection passage of the injection assembly, a sliding sleeve i 9 is further arranged in the injection passage of the injection assembly, the sliding sleeve i is located above the shearing pin i, and the communication hole in the side wall of the injection short-circuit body is blocked by the sliding sleeve i; the injection assembly is connected with the packing assembly through threads, sand blasting liquid is pumped into the injection pipeline, the wall of the production oil pipe is punctured by means of high-speed jet flow sprayed by the nozzle, a channel between the inner cavity of the production oil pipe and the annular space of the oil sleeve is opened, and the hydraulic perforation process is completed.
As shown in fig. 6 and 9, each of the anchor assemblies i 4 and ii 6 includes an anchor body 41, a communication hole is formed on a side wall of the anchor body, an anchor jaw 42 is installed in the communication hole, the jaw direction of the anchor jaw faces outward, and a ball seat ii 43 is formed in an injection channel of the anchor assembly i 4; after the pressure in the injection channel is increased, the anchor claw is expanded and anchored on the inner wall of the production oil pipe, on one hand, the centering effect of the rotary cutting assembly is achieved, on the other hand, the torque of the rotary cutting assembly can be prevented from being uploaded, the coiled tubing is damaged, and the positioning effect of the rotary cutting assembly can be achieved.
The diameter of injection passage between ball seat II and the ball seat I is less than the injection passage more than ball seat II, and the internal diameter of ball seat II is less than the internal diameter of sliding sleeve II, and the internal diameter of ball seat I is less than the internal diameter of sliding sleeve I, and the diameter of steel ball I is less than the diameter of steel ball II, and when I whereabouts of steel ball, can be smooth and easy pass through sliding sleeve II and ball seat II, the position of ball seat I is fallen to I whereabouts of direct drive sliding sleeve.
As shown in fig. 7 and 8, the rotary cutting assembly 5 comprises an upper joint 51, an outer cylinder 52, an inner cylinder 53, a lower joint 54 and a cutting nozzle 55, wherein the upper joint and the lower joint are connected through the inner cylinder, two ends of the outer cylinder are respectively rotatably connected to the upper joint and the lower joint, and bearings are arranged between the outer cylinder and the upper joint and the lower joint to facilitate smooth rotation; a cavity is arranged between the outer cylinder and the inner cylinder, the inner cylinder and the outer cylinder are provided with communicating holes, the communicating holes on the outer cylinder deflect at a certain angle, and the cutting nozzle is arranged in the communicating hole of the outer cylinder; the injection passage of the rotary cutting assembly is internally provided with a shearing pin II 56, the sliding sleeve II 8 is arranged in the injection passage of the rotary cutting assembly, the bottom of the sliding sleeve II abuts against the shearing pin II, and the sliding sleeve II plugs the communicating hole on the side wall of the inner cylinder.
The injection subassembly one end has the connection internal thread, coiled tubing one end has the connection external screw thread, seal and separate the subassembly, injection subassembly, anchor subassembly I, rotatory cutting subassembly and II homogeneous ends of anchor subassembly have the connection internal thread, the other end has the connection external screw thread, from the bottom up, the injection subassembly, seal and separate the subassembly, injection subassembly, anchor subassembly, rotatory cutting subassembly, anchor subassembly II and coiled tubing threaded connection in proper order, of course, the connection constitution of above-mentioned each part is not restricted to threaded connection yet, any can conveniently operate can dismantle the connection form all.
A method of operation using the downhole tool for deep sea rig-less permanent abandonment of wells as described above and shown in fig. 10-12, comprising the steps of:
the underground operation tool is put into the production oil pipe 102 through a continuous oil pipe, high-pressure cement slurry is pumped into the injection channel through the continuous oil pipe, the outward-expanding structure is expanded under the action of pressure, and the anchoring claw is in an anchoring state under the action of pressure in the pipe;
an oil sleeve annulus packer is arranged between the production oil pipe and the casing in advance, and when the pressure in the injection channel is increased, the oil sleeve annulus packer expands under the action of internal pressure to divide the space between the production oil pipe and the casing, so that cement slurry can be conveniently injected into the stratum subsequently. The oil jacket annulus divider is a pre-installed component on the production tubing and is not the main inventive content of this application and, therefore, will not be expanded as explained herein.
The cement paste is squeezed into the stratum through the bottom injection port under the action of high pressure; stopping the pump after the length of the squeezed cement plug meets the requirement, lifting the operation tool for waiting coagulation, injecting liquid into the ground for pressure test after waiting coagulation is finished, applying pressure through a continuous oil pipe injection head, detecting the top surface strength of the side, and finishing the sealing of the first section of cement plug after the strength is qualified;
lifting the position of a second section of cement plug on the operation tool, putting a steel ball I into the operation tool, increasing the pump injection pressure, breaking through the shear pin I by the sliding sleeve I under the action of the pressure in the injection channel, and dropping the sliding sleeve I into the position of the ball seat I, wherein the communication hole in the side wall of the injection assembly is opened at the moment; pumping high-pressure sand-blasting liquid into the injection channel, wherein the high-pressure sand-blasting liquid is sprayed out from the nozzle to puncture the pipe wall of the production oil pipe, and a punching hole is formed on the pipe wall of the production oil pipe, and the outward-expanding structure and the anchoring claw are also in a working state under the action of pressure in the process;
pumping cement slurry pre-positioned liquid into the injection channel, isolating the first section of cement plug from the second section of cement plug through the pre-positioned liquid, injecting the second section of cement plug, injecting the cement plug into the inner cavity of the production oil pipe, and further entering the space of an oil sleeve ring between the production oil pipe and the sleeve 103 from the breakdown hole, after the injection is finished, lifting the continuous oil pipe for waiting for coagulation, after the coagulation is finished, testing the pressure and probing the top surface of the cement plug, and finishing the sealing and fixing of the second section of cement plug after the cement plug is qualified;
lifting the operation tool to the position of a third section of cement plug, putting a steel ball II 101, increasing the pressure of pump injection, breaking a shearing pin II by a sliding sleeve II under the action of pressure in an injection channel, dropping the shearing pin II into the position of a ball seat II of an anchoring assembly I, opening a communication hole in the side wall of an inner cylinder, pumping high-pressure sand-blasting liquid into the injection channel, spraying the high-pressure sand-blasting liquid out of a cutting nozzle, cutting a pipe column to be cut by means of jet impact force, forming a certain torque on the outer cylinder by the reaction force of the jet impact force, rotating the outer cylinder relative to the inner cylinder due to the fact that the outer cylinder is connected with the inner cylinder through a bearing, realizing the cutting of a production oil pipe, and forming an annular notch on the production oil pipe, wherein an external expansion structure and an anchoring claw are; and after the cutting is finished, taking out the upper production oil pipe after the cutting.
Pumping cement slurry pre-posed liquid into the injection channel, isolating the second section of cement plug from the third section of cement plug through the pre-posed liquid, injecting the third section of cement plug inwards, filling the whole shaft inner cavity of the target well section with the cement plug at the moment, finishing the extrusion after the length of the extruded cement plug meets the requirement, lifting an operation tool for waiting for coagulation, testing the pressure and probing the top surface of the cement plug after the coagulation is finished, and finishing the sealing of the third section of cement plug after the pressure testing is qualified;
and finally, recovering the wellhead device, including the casing pipe head, the pipeline mud line hanger, the recovery underwater Christmas tree and other devices, and completing the whole well abandoning process.
The invention discloses an underground operation tool and a method for a deep sea drillless permanent abandoned well, which complete perforation operation on a production oil pipe through a jetting assembly and open a pore channel between a stratum and an injection channel; the annular cutting operation of the production oil pipe wall is completed through the jet assembly; the positioning and the division of the interval are strengthened through the external expanding structure, the anchoring claws also play a role in positioning and reinforcing, and the combined operation of perforation and cutting is completed in sequence in one string; the sliding sleeves I and II are matched with the steel balls I and II, and the communicating holes in the side wall of the inner cylinder and the communicating holes in the side wall of the spraying assembly can be opened in order, so that the production oil pipe can be conveniently punctured and cut; the whole well abandoning operation is completed by lowering the coiled tubing once without the assistance of a drilling machine derrick and a winch, so that the operation is flexible and the operation cost is lower.
In the description of the present invention, it should be noted that the terms "front end", "rear end", "left and right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Of course, the foregoing is only a preferred embodiment of the invention and should not be taken as limiting the scope of the embodiments of the invention. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.
Claims (8)
1. A downhole operation tool for a deep-sea drillless permanent abandoned well is mounted at the tail end of a coiled tubing (7) for use, and is characterized by comprising an injection assembly (1), a packing assembly (2), a jetting assembly (3), an anchoring assembly I (4), a rotary cutting assembly (5) and an anchoring assembly II (6) which are sequentially connected from head to head; the upper part of the injection assembly is connected with a coiled tubing (7), and injection channels which are communicated with each other are arranged in the injection assembly (1), the packing assembly (2), the injection assembly (3), the anchoring assembly I (4), the rotary cutting assembly (5) and the anchoring assembly II (6); the continuous oil pipe (7) is communicated with the injection channel;
the injection assembly (1) comprises an injection nozzle body (11), one end of the injection nozzle body (11) is provided with an injection port (13), and a ball seat I (12) is arranged in the injection nozzle body (11);
the packer assembly (2) comprises a packer body (21) and an outward expansion structure (22) connected to the separator body;
the injection assembly (3) comprises an injection short-circuit body (31), a communicating hole is formed in the side wall of the injection short-circuit body (31), a nozzle (32) is installed in the communicating hole, a shearing pin I (33) is arranged in an injection channel of the injection assembly (3), a sliding sleeve I (9) is further arranged in the injection channel of the injection assembly (3), the sliding sleeve I (9) is located above the shearing pin I (33), and the communicating hole in the side wall of the injection short-circuit body (31) is plugged by the sliding sleeve I (9);
the anchoring assembly I (4) and the anchoring assembly II (6) respectively comprise an anchoring body (41), a communication hole is formed in the side wall of the anchoring body (41), an anchoring claw (42) is installed in the communication hole, the claw direction of the anchoring claw (42) faces outwards, and a ball seat II (43) is formed in an injection channel of the anchoring assembly I (4);
the rotary cutting component (5) comprises an upper joint (51), an outer cylinder (52), an inner cylinder (53), a lower joint (54) and a cutting nozzle (55), the upper joint (51) and the lower joint (54) are connected through the inner cylinder (53), two ends of the outer cylinder (52) are respectively and rotatably connected to the upper joint (51) and the lower joint (54), a cavity is arranged between the outer cylinder (52) and the inner cylinder (53), communication holes are formed in the inner cylinder (53) and the outer cylinder (52), the communication holes in the outer cylinder (52) are inclined at a certain angle, and the cutting nozzle (55) is installed in the communication hole in the outer cylinder (52); the injection channel of the rotary cutting assembly (5) is internally provided with a shearing pin II (56), the sliding sleeve II (8) is arranged in the injection channel of the rotary cutting assembly (5), the bottom of the sliding sleeve II abuts against the shearing pin II, and the sliding sleeve II blocks the communicating hole on the side wall of the inner cylinder (53).
2. The downhole tool for deep sea drillless permanent well abandonment according to claim 1, wherein bearings are provided between the outer barrel (52) and the upper joint (51), and between the outer barrel (52) and the lower joint (54).
3. Downhole tool for deep-sea drillless permanent abandonment of wells according to claim 1, wherein the injection port (13) is flared.
4. The downhole tool for deep sea drillless permanent abandonment of wells according to claim 1, wherein the injection channel between the ball seat ii (43) and the ball seat i (12) has a smaller diameter than the injection channel above the ball seat ii (43).
5. The downhole tool for deep sea drillless permanent abandonment of wells according to claim 1, wherein the inner diameter of the ball seat ii (43) is smaller than the inner diameter of the sliding sleeve ii, and the inner diameter of the ball seat i (12) is smaller than the inner diameter of the sliding sleeve i (9).
6. The downhole tool for deep sea drillless permanent well abandonment according to claim 1, wherein the flaring structure (22) is a rubber structure.
7. The downhole tool for deep-sea drillless permanent well abandonment according to claim 1, wherein one end of the injection assembly (1) is provided with a connecting internal thread, one end of the coiled tubing (7) is provided with a connecting external thread, the packer assembly (2), the injection assembly (3), the anchor assembly I (4), the rotary cutting assembly (5) and the anchor assembly II (6) are provided with a connecting internal thread at one end, and a connecting external thread at the other end, and from bottom to top, the injection assembly (1), the packer assembly (2), the injection assembly (3), the anchor assembly (4), the rotary cutting assembly (5), the anchor assembly II (6) and the coiled tubing (7) are sequentially connected by threads.
8. A method of operating with a downhole tool according to any of claims 1-7, comprising the steps of:
s1: the underground operation tool is lowered into a production oil pipe (102) through a coiled oil pipe (7), high-pressure cement slurry is pumped into an injection channel through the coiled oil pipe (7), the outward-expanding structure (22) is expanded under the action of pressure, and the anchoring claw (42) is in an anchoring state under the action of pressure in the pipe;
s2: the cement paste is squeezed into the stratum through a bottom injection port (13) under the action of high pressure; when the length of the squeezed cement plug meets the requirement, stopping the pump, lifting the operation tool for waiting coagulation, injecting liquid into the ground for pressure test after waiting coagulation is finished, applying pressure through an injection head of a continuous oil pipe (7), detecting the top surface strength, and finishing the sealing of the first section of cement plug after the strength is qualified;
s3: lifting the position of a second section of cement plug on the operation tool, putting a steel ball I (10), increasing the pressure of pump injection, breaking through a shear pin I (33) by a sliding sleeve I (9) under the action of pressure in an injection channel, and dropping the sliding sleeve I (9) into a ball seat I (12), wherein a communication hole in the side wall of the injection assembly (3) is opened at the moment; pumping high-pressure sand blasting liquid into the injection channel, wherein the high-pressure sand blasting liquid is sprayed out from the nozzle (32) to puncture the pipe wall of the production oil pipe (102) and form a punching hole on the pipe wall of the production oil pipe (102), and the outward expansion structure (22) and the anchoring claw (42) are also in a working state under the action of pressure in the process;
s4: pumping cement slurry pre-positioned liquid into the injection channel, isolating the first section of cement plug from the second section of cement plug through the pre-positioned liquid, injecting the second section of cement plug, injecting the cement plug into the inner cavity of the production oil pipe (102), and further entering the space between the production oil pipe (102) and the sleeve (103) from the breakdown hole, lifting the continuous oil pipe (7) for waiting for setting after the injection is finished, testing the pressure and probing the top surface of the cement plug after the setting is finished, and finishing the sealing and fixing of the second section of cement plug after the cement plug is qualified;
s5: lifting the operation tool to the position of a third section of cement plug, throwing a steel ball II (101), increasing the pressure of pump injection to suppress pressure, breaking a shearing pin II by a sliding sleeve II under the action of pressure in an injection channel, falling into the position of a ball seat II (43) of an anchoring assembly I (4), opening a communication hole on the side wall of an inner cylinder (53), pumping high-pressure sand-blasting liquid into the injection channel, spraying the high-pressure sand-blasting liquid from a cutting nozzle (55), cutting a pipe column to be cut by means of jet impact force, and simultaneously reacting the jet impact force, a certain torque is formed on the outer cylinder (52), the outer cylinder (52) is connected with the inner cylinder (53) through a bearing, the outer cylinder (52) rotates relative to the inner cylinder (53) to realize the cutting of the production oil pipe (102), forming an annular cut in the production tubing (102), during which the flaring structure (22) and anchoring claws (42) are also in operation under pressure; and after the cutting is finished, taking out the upper production oil pipe after the cutting.
S6: pumping cement slurry pre-posed liquid into the injection channel, isolating the second section of cement plug from the third section of cement plug through the pre-posed liquid, injecting the third section of cement plug inwards, filling the whole shaft inner cavity of the target well section with the cement plug at the moment, finishing the extrusion after the length of the extruded cement plug meets the requirement, lifting an operation tool for waiting for coagulation, testing the pressure and probing the top surface of the cement plug after the coagulation is finished, and finishing the sealing of the third section of cement plug after the pressure testing is qualified;
s7: and finally, recovering the wellhead device to complete the whole well abandoning process.
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| CN112324377B (en) | 2023-12-12 |
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