CN117404040A - Fracturing wellhead leakage plugging device and plugging method - Google Patents
Fracturing wellhead leakage plugging device and plugging method Download PDFInfo
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- CN117404040A CN117404040A CN202311710729.3A CN202311710729A CN117404040A CN 117404040 A CN117404040 A CN 117404040A CN 202311710729 A CN202311710729 A CN 202311710729A CN 117404040 A CN117404040 A CN 117404040A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 59
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- 230000008569 process Effects 0.000 claims abstract description 6
- 238000007667 floating Methods 0.000 claims description 77
- 239000012530 fluid Substances 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 9
- 238000010008 shearing Methods 0.000 claims description 9
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 239000000758 substrate Substances 0.000 description 11
- 230000004044 response Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a fracturing wellhead leakage plugging device and a plugging method, and relates to the technical field of oil and gas exploration and development. The fracturing wellhead leakage plugging device comprises an annular sealing device, a plugging device under pressure and a plugging tubular column device; the plugging device comprises a mounting bracket, a pressurizing oil cylinder, a movable base, a stress force measuring assembly, a fixed dustproof clamping assembly, a fixed anti-top clamping assembly, a movable anti-top clamping assembly and a movable anti-sinking clamping assembly; the movable anti-sinking clamping assembly, the fixed anti-sinking clamping assembly and the fixed anti-sinking clamping assembly are alternately closed and opened to alternately clamp the pipe column, so that the pipe column is prevented from falling off and separating in the plugging process, and the stable lifting of the pipe column is ensured. The invention fully utilizes the original oil pipe head function of the fracturing wellhead to realize wellhead plugging, and has high reliability; all actions of the device are controlled by remote hydraulic pressure, so that the safety of operators is effectively guaranteed.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration and development, in particular to the technical field of wellhead plugging devices in high-risk environments such as wellhead gate leakage or out-of-control oil and gas well blowout, and more particularly relates to a pressure wellhead leakage plugging device and a plugging method.
Background
The sand fracturing operation is widely applied to reservoir reconstruction, the technology is mature, and the safety and reliability of equipment matched with the sand fracturing operation are improved. However, along with the promotion of deep shale gas exploration and development, fracturing operation pressure is higher and higher, and in the operation process, great alternating stress and high-pressure high-speed sand-carrying liquid damage to pipelines and valves is great, so that manifold or valve leakage is easily caused. The high-pressure high-speed sand-carrying fluid has high erosion speed to the leakage point, is extremely easy to cause situation runaway, and particularly aims at the wellhead internal control valve, if no quick and effective disposal means is provided, the blowout runaway can be caused.
At present, after the main control valve of the fracturing wellhead is in thorny leakage, the main control valve of the fracturing wellhead can only be used for treating by using a coiled tubing to drop into a packer, and the following problems exist in using the coiled tubing for plugging:
1. emergency allocation is carried out on nearby coiled tubing, if no idle equipment exists nearby, the emergency response time is long, the on-site installation time of the coiled tubing is long, and accidents are easy to further expand or upgrade;
2. when the coiled tubing is installed, long-time operation is needed near the thorn leakage wellhead, and the personnel safety risk is high;
3. in a wellhead puncture environment, the difficulty of the continuous oil pipe in the packer is high;
4. the success rate of plugging by using the coiled tubing is low, and the success rate of plugging by the coiled tubing in the packer is low and the failure probability after releasing is high under the high-speed sand-carrying fluid erosion environment.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a fracturing wellhead leakage plugging device and a plugging method, and aims to solve the problems that the existing fracturing wellhead main control valve leakage treatment technology is limited and the plugging success rate of a conventional coiled tubing is low. The invention provides a fracturing wellhead leakage plugging device, which is used for plugging a wellhead by pressing a packer into the wellhead under a pressure to form a fracturing lost circulation plugging method, so that the problems of low response and disposal speed, low plugging success rate by using a continuous oil pipe and the like are solved, and safe and efficient disposal of a fracturing wellhead lost circulation event is realized.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme.
The first aspect of the invention provides a fracturing wellhead leakage plugging device, which comprises an annular sealing device, a plugging device under pressure and a plugging tubular column device;
the annular sealing device is arranged on the fracturing wellhead device and is used for preventing well fluid from entering the plugging device under pressure; the plugging tubular column device comprises a tubular column and a packer body, wherein the packer body is in threaded connection with the lower end of the tubular column;
the plugging device comprises a mounting bracket, a pressurizing oil cylinder, a movable base, a stress force measuring assembly, a fixed dustproof clamping assembly, a fixed anti-top clamping assembly, a movable anti-top clamping assembly and a movable anti-sinking clamping assembly; the mounting bracket is fixedly connected with the annular sealing device, the pressurizing oil cylinder is assembled on the mounting bracket, and a piston rod of the pressurizing oil cylinder is fixedly connected with the movable base; the stress force measuring assembly is provided with two groups, one group of stress force measuring assembly is assembled on the mounting bracket, and the other group of stress force measuring assembly is mounted on the movable base; the fixed dustproof clamping assembly is arranged on a stress force measuring assembly on the mounting bracket, and the fixed anti-jacking clamping assembly is reversely arranged on the fixed anti-sinking clamping assembly; the floating anti-top clamping assembly and the floating anti-sinking clamping assembly are respectively arranged at two ends of the stress force measuring assembly of the movable base; the stress force measuring assembly, the fixed anti-top clamping assembly and the fixed anti-sinking clamping assembly on the mounting bracket are coaxially assembled with the stress force measuring assembly, the floating anti-top clamping assembly and the floating anti-sinking assembly on the movable base, and through holes for the pipe column of the plugging pipe column device to pass through are formed in the centers of the stress force measuring assembly, the fixed anti-top clamping assembly and the fixed anti-sinking clamping assembly;
the pressurizing oil cylinder, the fixed anti-top clamping assembly, the fixed anti-sinking clamping assembly, the floating anti-top clamping assembly, the floating anti-sinking assembly and the annular sealing device are respectively connected with the hydraulic control system, and the action of the hydraulic control system is controlled by the remote hydraulic control system.
Further preferably, the diameter of the lower part of the packer body is smaller than the diameter of the middle part of the packer body, and the middle part and the lower part of the packer body form a middle step in the middle part of the packer body.
Still further preferably, the diameter of the upper part of the packer body is larger than the diameter of the middle part of the packer body, and the connecting part between the upper part and the middle part of the packer body is provided with a slope.
Still further preferably, the plugging string device further comprises a packer rubber, and the packer rubber is assembled at the lower part of the middle step.
Still more preferably, the lower part of the packer rubber is connected with a pressing block.
Further preferably, the mounting bracket comprises an upper base plate and a lower base plate, and the lower base plate is connected with the annular space sealing device through bolts; the two ends of the cylinder body of the pressurizing cylinder are flange structures, the lower flange structure of the cylinder body of the pressurizing cylinder is connected to the lower base plate through bolts, and the upper flange structure of the cylinder body of the pressurizing cylinder is connected with the upper base plate through bolts; the upper base plate is provided with a through hole for the pipe column to pass through.
Still further preferably, the movable base is located above the upper substrate.
Still more preferably, the pressurizing cylinders are provided with two groups, and the two groups of pressurizing cylinders are respectively arranged at two ends of the upper base plate, the lower base plate and the movable base.
Further preferably, the annular sealing device comprises a blind ram, a semi-blind ram and a shear ram, wherein the blind ram is arranged at the lower part and is used for sealing the empty well; the shearing flashboard is arranged in the middle and used for shearing a pipe column, and the semi-sealing flashboard is arranged at the upper part and used for sealing an annulus.
Still further preferably, the under-pressure occluder device is connected to the annulus seal device as a sled.
The second aspect of the invention provides a plugging method of the fracturing wellhead leakage plugging device based on the first aspect, which comprises the following steps:
the initial state of the fracturing wellhead leakage plugging device is that the plugging device is connected with the annular sealing device to form a pry under pressure; the fully-sealed flashboard of the annular sealing device is in an open state, the plugging tubular column device is placed in the device with the pressing-up plugging device, and the lower part of the packer body is flush with the lower part of the fully-sealed flashboard of the annular sealing device; the fixed anti-sinking clamping assembly, the fixed anti-jacking clamping assembly, the floating anti-jacking clamping assembly and the floating anti-dust clamping assembly are closed, and the plugging pipe column is clamped; the semi-closed flashboard of the annular sealing device is in a closed state, and the outer annular space of the tubular column is sealed and plugged;
s1, after a certain valve in a fracturing wellhead device generates a puncture danger, when emergency rescue operation is needed to control the danger, connecting an annular sealing device to a fracturing head of the fracturing wellhead device, and completely opening the valve in the pressure wellhead device;
s2, opening the floating roof clamping assembly and the floating sinking clamping assembly, and enabling a piston rod of a pressurizing oil cylinder to ascend to drive the movable base, a stress force measuring assembly on the movable base, the floating roof clamping assembly and the floating sinking clamping assembly to ascend;
s3, closing the floating anti-top clamping assembly and the floating anti-sinking clamping assembly to clamp the pipe column, and opening the fixed anti-dust clamping assembly and the fixed anti-top clamping assembly; the piston rod of the pressurizing oil cylinder descends to drive the movable base, a stress force measuring assembly on the movable base, the movable top-proof clamping assembly and the movable sinking-proof clamping assembly to descend, and the pipe column descends along with the movable top-proof clamping assembly and the movable sinking-proof clamping assembly; after descending in place, closing the fixed dustproof clamping assembly and the fixed anti-top clamping assembly;
s4, repeating the steps S2-S3 until the lower inclined surface of the pressing block at the lower part of the packer body is contacted with the hanging step surface of the oil pipe hanger, pressing down to enable the packer rubber barrel of the plugging pipe column device to be compressed and expanded, plugging of a leakage wellhead is achieved, after the pipe head jackscrew is propped to limit the packer body, separating the pipe column from the packer body, and lifting the pipe column above a valve with the puncture leakage, so that the valve with the puncture leakage in the fracturing wellhead is replaced.
Further preferably, in the plugging process, the fixed dustproof clamping assembly and the fixed anti-jacking clamping assembly are in a closed state, and when the floating anti-jacking clamping assembly and the floating anti-sinking clamping assembly are in an open state, the stress force measuring assembly on the mounting bracket tests the jacking force of the pressure in the well to the pipe column.
Still more preferably, in the plugging process, a piston rod of the pressurizing oil cylinder descends to drive the movable base, the stress force measuring assembly on the movable base, the floating anti-top clamping assembly and the floating anti-sinking clamping assembly to descend, and the stress force measuring assembly on the movable base tests the upward jacking force of the pressure in the well to the pipe column.
Further preferably, when the piston rod of the pressurized oil cylinder descends to drive the pipe column of the plugging pipe column device to descend along with the floating anti-top clamping assembly and the floating anti-sinking clamping assembly under the condition that the pressure change of the fluid in the well is not obvious, the pressure block lower inclined surface at the lower part of the packer body in the plugging pipe column device is indicated to be in contact with the oil pipe hanging step surface and the wellhead plugging is completed when the value obtained by the test of the stress force measuring assembly on the movable base is changed greatly.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
the pressurized plugging device, the annular sealing device and the plugging tubular column are integrally skid-mounted, so that the quick response of emergency rescue can be realized; the stress force measuring assembly with the device for pressing the lower plugging device can measure the upward pushing force of the well fluid to the plugging tubular column in real time; the invention fully utilizes the original oil pipe head function of the fracturing wellhead to realize wellhead plugging, and has high reliability; all actions of the device are controlled by remote hydraulic pressure, so that the safety of operators is effectively guaranteed.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is an enlarged view of a portion of the plugging of the lower packer body of the plugging string device of the present invention;
reference numerals: 1. a lower substrate; 2. a pressurizing oil cylinder; 3. an upper substrate; 4. a movable base; 5. a nut; 6. the stress force measuring assembly, 7, fix and prevent sinking the chucking assembly; 8. fixing an anti-top clamping assembly; 9. a floating anti-top clamping assembly; 10. a swimming anti-sinking clamping assembly; 11. a pipe column, 12 and a packer body; 13. packer rubber; 14. briquetting; 15; a fixing nut; 16. and (5) jackscrews of the tubing head.
Detailed Description
The following are example embodiments of the invention defined by the claims and their equivalents, taken in conjunction with the accompanying drawings, in which the specific details are to be regarded as illustrative only and not limiting the scope of the invention. Accordingly, various changes and modifications to the embodiments may be made by one of ordinary skill in the art without departing from the scope and spirit of the invention.
Example 1
As a preferred embodiment of the present invention, referring to fig. 1 of the specification, the present embodiment discloses a fracturing wellhead leakage plugging device, which comprises an annular sealing device, a plugging device with pressure and a plugging tubular column device;
the annular sealing device is arranged on the fracturing wellhead device and is used for preventing well fluid from entering the plugging device under pressure; the plugging tubular column device comprises a tubular column 11 and a packer body 12, wherein the packer body 12 is connected to the lower end of the tubular column 11 in a threaded manner;
the plugging device comprises a mounting bracket, a pressurizing oil cylinder 2, a movable base 4, a stress force measuring assembly 6, a fixed dustproof clamping assembly, a fixed anti-jacking clamping assembly 8, a movable anti-jacking clamping assembly 9 and a movable anti-sinking clamping assembly 10; the mounting bracket is fixedly connected with the annular sealing device, the pressurizing oil cylinder 2 is assembled on the mounting bracket, and a piston rod of the pressurizing oil cylinder 2 is fixedly connected with the movable base 4; the stress force measuring assemblies 6 are provided with two groups, one group of stress force measuring assemblies 6 are assembled on the mounting bracket, and the other group of stress force measuring assemblies 6 are mounted on the movable base 4; the fixed dustproof clamping assembly is arranged on the stress force measuring assembly 6 on the mounting bracket, and the fixed anti-jacking clamping assembly 8 is inversely arranged on the fixed anti-sinking clamping assembly 7; the floating roof-proof clamping assembly 9 and the floating sinking-proof clamping assembly 10 are respectively arranged at two ends of the stress force measuring assembly 6 of the movable base 4; the stress force measuring assembly 6, the fixed anti-top clamping assembly 8 and the fixed anti-sinking clamping assembly 7 on the mounting bracket are coaxially assembled with the stress force measuring assembly 6, the floating anti-top clamping assembly 9 and the floating anti-sinking assembly on the movable base 4, and through holes for the pipe column 11 of the plugging pipe column device to pass through are formed in the centers of the stress force measuring assembly, the fixed anti-top clamping assembly and the fixed anti-sinking clamping assembly;
the pressurizing oil cylinder 2, the fixed anti-top clamping assembly 8, the fixed anti-sinking clamping assembly 7, the floating anti-top clamping assembly 9, the floating anti-sinking assembly and the annular sealing device are respectively connected with a hydraulic control system, and the action of the hydraulic control system is controlled by the hydraulic control system.
In the embodiment, the actions of the fixed anti-top clamping assembly 8, the fixed anti-sinking clamping assembly 7, the floating anti-top clamping assembly 9, the floating anti-sinking assembly and the annular sealing device are controlled through the remote hydraulic control system, so that the risk caused by short-distance operation of personnel at a fracturing wellhead is avoided.
In this embodiment, through the anti-sinking clamping assembly that moves about 9 and anti-sinking clamping assembly 10 and fixed anti-sinking clamping assembly 7 and fixed anti-sinking clamping assembly 8 close in turn and open, press from both sides tubular column 11 in turn, avoid in the shutoff in-process tubular column 11 dropping and break away from, ensure the steady play of tubular column 11.
In this embodiment, the installation support provides installation and supporting force for the pressurization cylinder 2, and the pipe column 11 is lifted or lowered by the pressurization cylinder 2 and controlled by a remote hydraulic control system, so that the plugging efficiency is greatly improved.
Example 2
As a further preferred embodiment of the present invention, this embodiment is further supplemented and explained in detail by the technical solution of the present invention based on embodiment 1 described above. In this embodiment, referring to fig. 2 of the specification, the diameter of the lower part of the packer body 12 is smaller than the diameter of the middle part of the packer body 12, and the middle part and the lower part of the packer body 12 form a middle step in the middle part of the packer body 12. The diameter of the upper part of the packer body 12 is larger than that of the middle part of the packer body 12, and the connecting part of the upper part and the middle part of the packer is provided with a slope. The plugging tubular column device further comprises a packer rubber cylinder 13, and the packer rubber cylinder 13 is assembled at the lower part of the middle step. The lower part of the packer rubber cylinder 13 is connected with a pressing block 14.
In this embodiment, the middle step of the packer body 12 is provided to facilitate the assembly of the packer rubber 13, and to provide a certain space for the expansion of the packer rubber 13. In the embodiment, a channel in a fracturing wellhead is sealed by a packer rubber cylinder 13 below a packer body 12. The pressing block 14 is matched and sealed with the hanging step surface of the hanger, and the packer rubber cylinder 13 at the lower part of the packer body 12 is compressed and expanded along with the continuous lowering of the tubular column 11, so that the plugging of a leakage wellhead is realized, the plugging effect is good, and leakage cannot occur after releasing.
Example 3
As a further preferred embodiment of the present invention, this embodiment is further supplemented and explained in detail by the technical solution of the present invention based on embodiment 1 or embodiment 2 described above. In this embodiment, referring to fig. 1 of the specification, the mounting bracket includes an upper substrate 3 and a lower substrate 1, where the lower substrate 1 is connected to an annular sealing device by bolts; the two ends of the cylinder body of the pressurizing cylinder 2 are flange structures, the lower flange structure of the cylinder body of the pressurizing cylinder 2 is connected to the lower base plate 1 through bolts, and the upper flange structure of the cylinder body of the pressurizing cylinder 2 is connected with the upper base plate 3 through bolts; the upper base plate 3 is provided with a through hole through which the column 11 passes.
Specifically, the movable base 4 is located above the upper substrate 3. The pressurizing oil cylinders 2 are provided with two groups, and the two groups of pressurizing oil cylinders 2 are respectively arranged at two ends of the upper base plate 3, the lower base plate 1 and the movable base 4.
The annular sealing device comprises a totally-enclosed flashboard, a semi-enclosed flashboard and a shearing flashboard, wherein the totally-enclosed flashboard is arranged at the lower part and is used for sealing an empty well; the shear ram is mounted in the middle for shearing the tubular column 11, and the semi-seal ram is mounted in the upper for sealing the annulus. In this embodiment, the annulus seal prevents well fluid from entering the pressured down occluder device.
As an implementation mode of the embodiment, the under-pressure plugging device is connected with the annular sealing device to form a pry, so that quick response of emergency rescue can be realized.
Example 4
As a further preferred embodiment of the present invention, this embodiment is further supplemented and explained in detail by the technical solution of the present invention based on the above-described embodiment 1, embodiment 2 or embodiment 3.
Referring to fig. 1 and 2 of the specification, the embodiment discloses a fracturing wellhead leakage plugging device, which comprises an annular sealing device, a plugging device under pressure and a plugging tubular column device.
The annular sealing device is arranged on the fracturing wellhead and is used for preventing well fluid from entering the device with the pressure lower plugging device, and comprises a full-sealing flashboard, a half-sealing flashboard and a shearing flashboard; the totally-enclosed flashboard is arranged at the lower part and is used for sealing the empty well; the shearing flashboard is arranged in the middle and is used for shearing the pipe column; the semi-seal flashboard is arranged at the upper part and is used for sealing the annular space.
The device mainly comprises a lower base plate 1, a pressurizing oil cylinder 2, an upper base plate 3, a movable base 4, a nut 5, a stress force measuring assembly 6, a fixed anti-sinking clamping assembly 7, a fixed anti-jacking clamping assembly 8, a floating anti-jacking clamping assembly 9, a floating anti-sinking clamping assembly 10 and the like. The lower base plate 1 is connected with an annular sealing device through bolts, and a 180mm through hole is formed in the middle of the lower base plate. The stress measuring assembly 6 is respectively arranged on the lower base plate 1 and the movable base 4. The two ends of the cylinder body of the pressurizing cylinder 2 are flange type, and the lower flange is connected with the outer side of the lower base plate 1 through bolts. The upper base plate 3 is connected with the flange at the upper part of the pressurizing oil cylinder 2 through bolts, and a 180mm through hole is formed in the middle of the upper base plate and is coaxial with the 180mm through hole of the lower base plate 1. The movable base 4 is connected to the cylinder rod of the pressurizing cylinder 2 and fixed by a nut, and a 180mm through hole is formed in the middle of the movable base and is coaxial with the 180mm through holes of the upper base plate 3 and the lower base plate 1. The stress force measuring assembly 6 is respectively arranged on the lower base plate 1 and the movable base 4, and a 180mm through hole is formed in the middle of the stress force measuring assembly and is coaxial with the 180mm through holes of the lower base plate 1 and the movable base 4. The fixed anti-sinking clamping assembly 7 is arranged on the stress force measuring assembly 6 of the lower substrate 1, the fixed anti-jacking clamping assembly 8 is inversely arranged on the fixed anti-sinking clamping assembly 7, and the central shaft of the clamping assembly is coaxial with the 180mm through hole of the lower substrate 1. The floating roof-proof clamping assembly 9 and the floating sinking-proof clamping assembly 10 are respectively arranged on the stress force measuring assembly 6 of the movable base 4, and the central shaft of the clamping assembly is coaxial with the 180mm through hole of the lower substrate 1.
The plugging tubular column mainly comprises a tubular column 11, a packer body 12, a packer rubber cylinder 13, a pressing block 14, a fixing nut 15 and the like. The pipe column 11 is clamped and fixed by a fixed anti-sinking clamping assembly 7, a fixed anti-jacking clamping assembly 8, a movable anti-jacking clamping assembly 9 and a movable anti-sinking clamping assembly 10. The packer body 12 is connected to the lower end of the pipe column 11 through threads, the upper portion and the lower portion of the packer body 12 are small, the middle portion of the packer body is large, and the connecting portion between the upper portion and the middle portion is provided with inclination. The packer rubber cylinder 13 is connected to the lower part of the middle step of the packer body 12, the lower part of the packer rubber cylinder 13 is connected with the pressing block 14, and the pressing block is fixed by the fixing nut 15.
The actions of the annular sealing device, the pressurizing oil cylinder 2, the fixed anti-sinking clamping assembly 7, the fixed anti-jacking clamping assembly 8, the movable anti-jacking clamping assembly 9 and the movable anti-sinking clamping assembly 10 are controlled by remote hydraulic pressure.
Example 5
As a further preferred embodiment of the present invention, this embodiment provides a plugging method based on the fracturing wellhead plugging device described in the above embodiment 1, embodiment 2, embodiment 3 or embodiment 4.
In this embodiment, in the initial state of the fracturing wellhead plugging device, the under-pressure plugging device is connected with the annular sealing device to form a sled. The fully-sealed flashboard of the annular sealing device is in an open state, the plugging tubular column device is placed in the device with the pressure plugging device, and the lower part of the packer body 12 is flush with the lower part of the fully-sealed flashboard of the annular sealing device; the fixed anti-sinking clamping assembly 7, the fixed anti-jacking clamping assembly 8, the movable anti-jacking clamping assembly 9 and the movable anti-dust clamping assembly are closed to clamp the plugging tubular column 11; the semi-closed flashboard of the annular sealing device is in a closed state, and the outer annular space of the tubular column 11 is sealed and plugged.
The specific plugging method comprises the following steps: s1, after a certain valve in a fracturing wellhead device generates a puncture danger, when emergency rescue operation is needed to control the danger, connecting an annular sealing device to a fracturing head of the fracturing wellhead device, and completely opening the valve in the pressure wellhead device;
s2, opening the floating roof clamping assembly 9 and the floating anti-sinking clamping assembly 10, and enabling a piston rod of the pressurizing oil cylinder 2 to ascend to drive the movable base 4, the stress force measuring assembly 6 on the movable base 4, the floating roof clamping assembly 9 and the floating anti-sinking clamping assembly 10 to ascend;
s3, closing the floating anti-top clamping assembly 9 and the floating anti-sinking clamping assembly 10 to clamp the pipe column 11, and opening the fixed anti-dust clamping assembly and the fixed anti-top clamping assembly 8; the piston rod of the pressurizing oil cylinder 2 descends to drive the movable base 4, the stress force measuring assembly 6 on the movable base 4, the floating anti-top clamping assembly 9 and the floating anti-sinking clamping assembly 10 to descend, and the pipe column 11 descends along with the floating anti-top clamping assembly 9 and the floating anti-sinking clamping assembly 10; after descending in place, closing the fixed dustproof clamping assembly and the fixed anti-top clamping assembly 8;
s4, repeating the steps S2-S3 until the lower inclined surface of the pressing block 14 at the lower part of the packer body 12 is contacted with the hanging step surface of the oil pipe hanger, pressing down to enable the packer rubber cylinder 13 of the plugging pipe column device to be compressed and expanded, plugging of a leakage wellhead is achieved, after the pipe head jackscrew 16 is propped against the packer body 12 to limit the packer body 12, separating the pipe column 11 from the packer body 12, and lifting the pipe column 11 above a valve with the puncture leakage, so that the valve with the puncture leakage in the fracturing wellhead is replaced.
Example 6
As a further preferred embodiment of the present invention, this embodiment is further detailed supplement and explanation of the technical solution of the present invention based on embodiment 5 described above. In this embodiment, referring to fig. 1 of the specification, in an initial state of the fracturing wellhead plugging device, the plugging device is connected with the annular sealing device in a prying manner. The fully-sealed flashboard of the annular sealing device is in an open state, the plugging tubular column device is placed in the device with the pressure plugging device, and the lower part of the packer body 12 is flush with the lower part of the fully-sealed flashboard of the annular sealing device; the fixed anti-sinking clamping assembly 7, the fixed anti-jacking clamping assembly 8, the movable anti-jacking clamping assembly 9 and the movable anti-dust clamping assembly are closed to clamp the plugging tubular column 11; the semi-closed flashboard of the annular sealing device is in a closed state, and the outer annular space of the tubular column 11 is sealed and plugged.
Step one: after the fracturing wellhead 1# valve is subjected to the emergency, when the emergency operation is needed to control the dangerous situation, the annular sealing device is connected to the fracturing head of the fracturing wellhead, and the fracturing wellhead 1# valve and the fracturing wellhead 4# valve are completely opened.
Step two: the movable base 4, the stress force measuring assembly 6 on the movable base 4, the movable top-preventing clamping assembly 9 and the movable sinking-preventing clamping assembly 10 are driven to ascend by opening the movable top-preventing clamping assembly 9 and the movable sinking-preventing clamping assembly 10 and the piston of the pressurizing oil cylinder 2 to ascend.
Step three: closing the floating anti-top clamping assembly 9 and the floating anti-sinking clamping assembly 10 to clamp the plugging tubular column 11, and opening the fixed anti-top clamping assembly 8 and the fixed anti-dust clamping assembly; the piston of the pressurizing oil cylinder 2 descends to drive the movable base 4, the stress force measuring assembly 6, the floating anti-top clamping assembly 9 and the floating anti-sinking clamping assembly 10 on the movable base 4 to descend, the plugging pipe column 11 descends along with the floating anti-top clamping assembly 9 and the floating anti-sinking clamping assembly 10, and the fixed anti-sinking clamping assembly 7 and the fixed anti-top clamping assembly 8 are closed.
Step four: and step two and step three are repeated until the lower inclined surface of the pressing block 14 of the plugging tubular column 11 is contacted with the hanging step surface of the oil pipe hanger, and the pressing down is carried out to enable the packer rubber cylinder 13 of the plugging tubular column 11 to be compressed and expanded, so that the plugging of a leakage wellhead is realized, and the replacement of the No. 1 valve can be completed after the jackscrew 16 of the oil pipe head is propped up.
After the packer body 12 is limited by propping up the tubing head jackscrew 16, the separation of the packer body 12 and the tubing head 11 is completed by rotating the tubing head 11, then the floating anti-propping clamping assembly 9 and the floating anti-sinking clamping assembly 10 are closed, the fixed anti-propping clamping assembly 8 and the fixed anti-dust clamping assembly are opened, the pressurizing oil cylinder 2 is ascended, and the tubing head 11 is ascended along with the floating anti-propping clamping assembly 9 and the floating anti-sinking clamping assembly 10; lifting the column 11 above the # 1 valve, i.e., changing the # 1 valve, does not affect the position of the take-out # 1 valve. When the replacement of the No. 1 valve is completed, the pipe column 11 is lowered to the packer body 12, the packer body 12 and the pipe column 11 are connected together through the rotation pipe column 11 in a threaded mode, then the pipe column 11 is lifted up through the pressurizing oil cylinder 2, the No. 1 valve and the No. 4 valve are gradually closed until the packer body 12 leaves the fracturing wellhead device, and the annular sealing device and the plugging device under pressure are disassembled.
When the fixed anti-sinking clamping assembly 7 and the fixed anti-jacking clamping assembly 8 are in a closed state, the floating anti-jacking clamping assembly 9 and the floating anti-sinking clamping assembly 10 are in an open state, the stress force measuring assembly 6 on the lower substrate 1 can display the jacking force of the pressure in the well to the plugging tubular column 11.
When the piston of the pressurizing oil cylinder 2 descends, the movable base 4, the stress force measuring assembly 6 on the movable base 4, the floating anti-top clamping assembly 9 and the floating anti-sinking clamping assembly 10 are driven to descend, and the stress force measuring assembly 6 on the lower end surface of the movable base 4 can display the upward pushing force of the pressure in the well to the plugging pipe column 11.
Under the condition that the pressure change of the fluid in the well is not obvious, when the piston of the pressurizing oil cylinder 2 descends, the plugging pipe column 11 is driven to descend along with the floating anti-top clamping assembly 9 and the floating anti-sinking clamping assembly 10, and when the stress force measuring assembly 6 on the movable base 4 is greatly changed, the lower inclined surface of the pressing block 14 of the plugging pipe column 11 is indicated to be in contact with the hanging step surface of the oil pipe hanger, and the wellhead plugging is completed.
Claims (12)
1. The utility model provides a fracturing well head leakage plugging device which characterized in that: the device comprises an annular sealing device, a plugging device with a pressing-up function and a plugging tubular column device;
the annular sealing device is arranged on the fracturing wellhead device and is used for preventing well fluid from entering the plugging device under pressure; the plugging tubular column device comprises a tubular column (11) and a packer body (12), wherein the packer body (12) is in threaded connection with the lower end of the tubular column (11);
the plugging device comprises a mounting bracket, a pressurizing oil cylinder (2), a movable base (4), a stress force measuring assembly (6), a fixed dustproof clamping assembly, a fixed anti-jacking clamping assembly (8), a movable anti-jacking clamping assembly (9) and a movable anti-sinking clamping assembly (10); the installation support is fixedly connected with the annular sealing device, the pressurizing oil cylinder (2) is assembled on the installation frame, and a piston rod of the pressurizing oil cylinder (2) is fixedly connected with the movable base (4); the stress force measuring assemblies (6) are provided with two groups, one group of stress force measuring assemblies (6) are assembled on the mounting bracket, and the other group of stress force measuring assemblies (6) are mounted on the movable base (4); the fixed dustproof clamping assembly is arranged on a stress force measuring assembly (6) on the mounting bracket, and the fixed anti-jacking clamping assembly (8) is inversely arranged on the fixed anti-sinking clamping assembly (7); the floating anti-top clamping assembly (9) and the floating anti-sinking clamping assembly (10) are respectively arranged at two ends of the stress force measuring assembly (6) of the movable base (4); the stress force measuring assembly (6), the fixed anti-top clamping assembly (8) and the fixed anti-sinking clamping assembly (7) on the mounting bracket are coaxially assembled with the stress force measuring assembly (6), the floating anti-top clamping assembly (9) and the floating anti-sinking assembly on the movable base (4), and through holes for a pipe column (11) of the plugging pipe column device to pass through are formed in the centers of the stress force measuring assembly, the fixed anti-top clamping assembly and the fixed anti-sinking clamping assembly;
the pressurizing oil cylinder (2), the fixed anti-top clamping assembly (8), the fixed anti-sinking clamping assembly (7), the floating anti-top clamping assembly (9), the floating anti-sinking assembly and the annular sealing device are respectively connected with the hydraulic control system, and the action of the hydraulic control system is controlled by the remote hydraulic control system.
2. The fracturing wellhead leak-off device of claim 1, wherein: the diameter of the lower part of the packer body (12) is smaller than that of the middle part of the packer body (12), and the middle part and the lower part of the packer body (12) form a middle step in the middle part of the packer body (12); the diameter of the upper part of the packer body (12) is larger than that of the middle part of the packer body (12), and the connecting part between the upper part and the middle part of the packer is provided with a slope.
3. The fracturing wellhead leak-off device of claim 2, wherein: the plugging tubular column device further comprises a packer rubber cylinder (13), and the packer rubber cylinder (13) is assembled at the lower part of the middle step; the lower part of the packer rubber cylinder (13) is connected with a pressing block (14).
4. A frac wellhead leak-off device as claimed in any one of claims 1 to 3, characterised in that: the mounting bracket comprises an upper base plate (3) and a lower base plate (1), and the lower base plate (1) is connected with the annular sealing device through bolts; the two ends of the cylinder body of the pressurizing cylinder (2) are flange structures, the lower flange structure of the cylinder body of the pressurizing cylinder (2) is connected to the lower base plate (1) through bolts, and the upper flange structure of the cylinder body of the pressurizing cylinder (2) is connected with the upper base plate (3) through bolts; the upper base plate (3) is provided with a through hole for the pipe column (11) to pass through.
5. The fracturing wellhead leak-off device of claim 4, wherein: the movable base (4) is positioned above the upper base plate (3).
6. The fracturing wellhead leak-off device of claim 4, wherein: the pressurizing oil cylinders (2) are arranged in two groups, and the two groups of pressurizing oil cylinders (2) are respectively arranged at two ends of the upper base plate (3), the lower base plate (1) and the movable base (4).
7. A frac wellhead leak-off device as claimed in any one of claims 1 to 3, characterised in that: the annular sealing device comprises a totally-enclosed flashboard, a semi-enclosed flashboard and a shearing flashboard, wherein the totally-enclosed flashboard is arranged at the lower part and is used for sealing an empty well; the shear flashboard is arranged in the middle and used for shearing a tubular column (11), and the semi-seal flashboard is arranged in the upper and used for sealing an annulus.
8. A frac wellhead leak-off device as claimed in any one of claims 1 to 3, characterised in that: the plugging device is connected with the annular sealing device to form a pry.
9. A plugging method based on the fracturing wellhead leakage plugging device according to any one of claims 1 to 8, characterized in that:
the initial state of the fracturing wellhead leakage plugging device is that the plugging device is connected with the annular sealing device to form a pry under pressure; the fully-sealed flashboard of the annular sealing device is in an open state, the plugging tubular column device is placed in the device with the plugging device under pressure, and the lower part of the packer body (12) is flush with the lower part of the fully-sealed flashboard of the annular sealing device; the fixed anti-sinking clamping assembly (7), the fixed anti-jacking clamping assembly (8), the movable anti-jacking clamping assembly (9) and the movable anti-dust clamping assembly are closed, and the plugging pipe column (11) is clamped; the semi-closed flashboard of the annular sealing device is in a closed state, and the outer annular space of the tubular column (11) is sealed and plugged;
the method comprises the following steps:
s1, after a certain valve in a fracturing wellhead device generates a puncture danger, when emergency rescue operation is needed to control the danger, connecting an annular sealing device to a fracturing head of the fracturing wellhead device, and completely opening the valve in the pressure wellhead device;
s2, opening the floating anti-top clamping assembly (9) and the floating anti-sinking clamping assembly (10), and enabling a piston rod of the pressurizing oil cylinder (2) to ascend to drive the movable base (4), a stress force measuring assembly (6) on the movable base (4), the floating anti-top clamping assembly (9) and the floating anti-sinking clamping assembly (10) to ascend;
s3, closing the floating anti-top clamping assembly (9) and the floating anti-sinking clamping assembly (10) to clamp the pipe column (11), and opening the fixed anti-dust clamping assembly and the fixed anti-top clamping assembly (8); a piston rod of the pressurizing oil cylinder (2) descends to drive the movable base (4), a stress force measuring assembly (6) on the movable base (4), a traveling anti-top clamping assembly (9) and a traveling anti-sinking clamping assembly (10) to descend, and the pipe column (11) descends along with the traveling anti-top clamping assembly (9) and the traveling anti-sinking clamping assembly (10); after descending in place, closing the fixed dustproof clamping assembly and the fixed anti-jacking clamping assembly (8);
s4, repeating the steps S2-S3 until the lower inclined surface of a pressing block (14) at the lower part of the packer body (12) is in contact with the hanging step surface of the oil pipe hanger, pressing down to enable a packer rubber cylinder (13) of the plugging pipe column device to be compressed and expanded, plugging a leakage wellhead is achieved, after a jacking oil pipe head jackscrew (16) limits the packer body (12), separating the pipe column (11) from the packer body (12), lifting the pipe column (11) to the position above a valve with a puncture leakage, and replacing the valve with the puncture leakage in a fracturing wellhead.
10. The plugging method of claim 9, wherein: in the plugging process, the fixed dustproof clamping assembly, the fixed anti-jacking clamping assembly (8) are in a closed state, and when the floating anti-jacking clamping assembly (9) and the floating anti-sinking clamping assembly (10) are in an open state, the stress force measuring assembly (6) on the mounting bracket tests the jacking force of the pressure in the well to the pipe column (11).
11. The plugging method of claim 9, wherein: in the plugging process, a piston rod of the pressurizing oil cylinder (2) descends to drive the movable base (4), a stress force measuring assembly (6) on the movable base (4), a floating anti-top clamping assembly (9) and a floating anti-sinking clamping assembly (10) to descend, and the stress force measuring assembly (6) on the movable base (4) tests the upward pushing force of the pressure in the well on the pipe column (11).
12. The plugging method of claim 9, wherein: under the condition that the pressure change of the fluid in the well is not obvious, when a piston rod of the pressurizing oil cylinder (2) descends, a pipe column (11) of the plugging pipe column device is driven to descend along with the floating anti-top clamping assembly (9) and the floating anti-sinking clamping assembly (10), and when a value obtained by testing the stress force measuring assembly (6) on the movable base (4) changes greatly, the fact that the lower inclined surface of a pressing block (14) at the lower part of the packer body (12) in the plugging pipe column device contacts with the hanging step surface of the oil pipe is indicated, and well mouth plugging is completed.
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| CN202311710729.3A CN117404040B (en) | 2023-12-13 | 2023-12-13 | Fracturing wellhead leakage plugging device and plugging method |
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| CN202311710729.3A CN117404040B (en) | 2023-12-13 | 2023-12-13 | Fracturing wellhead leakage plugging device and plugging method |
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