CN112227997A - Coal bed gas pressurized well repairing device and well repairing method - Google Patents
Coal bed gas pressurized well repairing device and well repairing method Download PDFInfo
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- CN112227997A CN112227997A CN202011285226.2A CN202011285226A CN112227997A CN 112227997 A CN112227997 A CN 112227997A CN 202011285226 A CN202011285226 A CN 202011285226A CN 112227997 A CN112227997 A CN 112227997A
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- 239000003245 coal Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 193
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 129
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 60
- 239000010720 hydraulic oil Substances 0.000 claims description 40
- 230000007246 mechanism Effects 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 11
- 210000001503 joint Anatomy 0.000 claims description 11
- 230000002265 prevention Effects 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 8
- 239000007769 metal material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
-
- 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
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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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
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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- Geology (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pipe Accessories (AREA)
Abstract
A coal bed gas pressurized workover device and a workover method are provided, the workover device comprises an upper sealing device and a lower sealing device, the lower sealing device comprises a wellhead blowout preventer, the lower end of the lower sealing device is connected with a wellhead flange plate through a first connecting flange, and the upper end of the lower sealing device is connected with the upper sealing device through a second connecting flange; when repairing the well, the well repairing device is fixed on the wellhead flange plate, the sucker rod is lifted out by utilizing an external lifting device, and the two processes can be replaced in sequence; throwing a plug throwing device into the oil pipe; the external oil pipe downwards passes through the device to be connected with the oil pipe hanger, and the device is utilized to seal the external oil pipe; lifting the external oil pipe, separating the fixed outer pipe from the movable inner pipe when the oil pipe hanger is seen by the camera, lifting the movable inner pipe to a preset position, and sealing the external oil pipe by using a wellhead blowout preventer; loosening the external oil pipe, and dropping the movable inner pipe back to expose the oil pipe hanger; and (4) dismantling the tubing hanger. The invention has simple structure, can realize operation under pressure, improves the gas production rate and gas production effect in the well, saves cost, and is safe and environment-friendly in well repair.
Description
Technical Field
The invention relates to the technical field of coal bed gas well workover, in particular to a coal bed gas pressurized well workover device and a coal bed gas pressurized well workover method.
Background
The current well repairing technology is mostly non-pressurized well repairing operation, gas in a well needs to be discharged completely before well repairing, and then well repairing operation is carried out. However, this method of well intervention has the following disadvantages:
1. a large amount of gas is wasted, the gas release time in the well is too long, the maintenance time is too long, and the gas is discharged into the air to cause serious pollution;
2. gas in the well is discharged completely, so that an air outlet at the bottom of the gas production well is closed, and the gas production of the subsequent gas production well is reduced;
3. the gas is not completely discharged, and the safety of operators is harmed when the operators go to the field for operation.
Therefore, the present inventors have made extensive studies to design a coal bed methane pressurized workover apparatus and a coal bed methane pressurized workover method that can solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a coal bed gas under-pressure workover device and a coal bed gas under-pressure workover method, which have simple and compact structural design, can realize under-pressure workover operation, can improve gas production and gas production effects, save cost, and are safe and environment-friendly for workover.
In order to achieve the purpose, the technical solution of the invention is as follows: the utility model provides a coal bed gas area pressure well workover device, includes the upper portion sealing device that is used for sealed oil pipe and installs the lower part sealing device in wellhead, lower part sealing device includes well head preventer or seal assembly, the lower extreme of well head preventer or seal assembly is connected fixedly with the well head ring flange through first flange, well head preventer or seal assembly's upper end pass through the second flange with upper portion sealing device is connected.
The coal bed gas pressurized well repairing device comprises a wellhead blowout preventer, a full-seal blowout preventer and a half-seal blowout preventer, the semi-closed blowout preventer is connected with the fully-closed blowout preventer in a sealing manner, the fully-closed blowout preventer comprises two first shells, first sealing parts are respectively arranged in inner cavities of the two first shells, the two first sealing parts are respectively connected with a first hydraulic oil cylinder, the two first hydraulic oil cylinders can drive the two first sealing parts to be in butt joint sealing, the semi-sealed blowout preventer comprises two second shells, wherein the two second shells are connected to the upper ends of the two first shells, the inner cavities of the two second shells are respectively provided with a second sealing element, the two second sealing elements are respectively connected with a second hydraulic cylinder, and the two second hydraulic cylinders can drive the two second sealing elements to be in butt joint to form an annular sealing ring of a semi-sealed oil pipe.
The coal bed gas pressurized well repairing device is characterized in that cable extraction ports are formed in the first connecting flange and the second connecting flange, and cameras are mounted on the first connecting flange and the second connecting flange.
The coal bed gas pressurized well repairing device comprises a main body support, wherein a first through hole is formed in the center of the main body support, the lower end of the main body support is connected with a second connecting flange, two third hydraulic oil cylinders are connected to two opposite positions of the upper surface of the main body support, a split blowout preventer or a sealing assembly is arranged between the two third hydraulic oil cylinder bodies, the split blowout preventer comprises two fourth hydraulic oil cylinders, piston rods of the two fourth hydraulic oil cylinders are connected with two third sealing elements, and the two fourth hydraulic oil cylinders can drive the two third sealing elements to be in butt joint with a sealing oil pipe.
The coal bed gas under-pressure well repairing device is characterized in that piston rods of two third hydraulic oil cylinders are respectively connected with a first upper support through adjustable bolts, a second through hole through which an oil supply pipe can penetrate is formed in the center of the first upper support, two blowout prevention moving slips are connected to the first upper support, the two blowout prevention moving slips are connected with two fifth hydraulic oil cylinders, and the two fifth hydraulic oil cylinders can drive the two blowout prevention moving slips to be in butt joint sealing to clamp the oil pipe.
The coal bed gas pressurized well repairing device comprises a main body support, wherein a first through hole is formed in the main body support, a movable inner pipe is arranged above the fixed outer pipe, the lower end of the movable inner pipe extends into the inner cavity of the fixed outer pipe, the upper end of the fixed outer pipe is connected with the movable inner pipe through a detachable connecting piece, and the fixed outer pipe and the movable inner pipe are communicated or separated through a power mechanism.
The coal bed gas pressurized well repairing device comprises a fixed outer pipe, a movable inner pipe, a detachable connecting piece and a movable outer pipe, wherein the upper end of the fixed outer pipe is connected with an outer pipe flange, the lower end of the movable inner pipe is connected with an inner pipe flange, and the outer pipe flange and the inner pipe flange are connected together through the detachable connecting piece.
The coal bed gas pressurized well repairing device comprises a power mechanism, a main body support, a movable inner pipe, a hydraulic oil cylinder, a piston rod.
The coal bed gas pressurized well repairing device is characterized in that the movable inner pipe is communicated with the first connecting flange through a connecting pipeline, and a vacuum pump is mounted on the connecting pipeline.
The coal bed gas pressurized well repairing device comprises a main body support connected with a first connecting flange or a first upper support, wherein a third through hole is formed in the center of the main body support, two seventh hydraulic oil cylinders are connected to two sides of the main body support, clamp parts are connected to piston rods at the upper ends of the two seventh hydraulic oil cylinders respectively, a revolving body with a T-shaped cross section is formed when the two clamp parts are butted, a fourth through hole is formed in the center of the T-shaped revolving body, a conical hole with a small upper end and a large lower end is formed in the lower portion of the fourth through hole, two fourth sealing parts are arranged in the third through hole of the main body support below the clamp parts, the upper portions of the two fourth sealing parts abut against the lower portions of the opposite surfaces of the two clamp parts, and when the two clamp parts move downwards along with the two seventh hydraulic oil cylinders, and the two fourth sealing elements are driven to move relatively, so that the oil pipe is clamped in a sealing manner.
A coal bed gas belt pressure well repairing method comprises the following steps:
(1) tightly connecting and fixing a first connecting flange of the coal bed gas pressurized well repairing device with a wellhead flange plate, and completely lifting a sucker rod in a well upwards by using an external lifting device, wherein the two processes can be replaced sequentially;
(2) after the sucker rod is completely lifted out, throwing the plug throwing device into the oil pipe in the well, so that the plug throwing device seals the oil pipe in the well;
(3) an external oil pipe downwards passes through the coalbed methane pressurized workover rig by using an external lifting device and then is put at a wellhead, the external oil pipe is connected with an oil pipe hanger connected with the upper end of the oil pipe in the well, and then the external oil pipe is sealed by using a split blowout preventer of the coalbed methane pressurized workover rig;
(4) the external oil pipe is lifted by using an external lifting device, when the oil pipe hanger is observed by a camera, the fixed outer pipe is separated from the movable inner pipe, the movable inner pipe is lifted to a preset position by using a power mechanism, then the external oil pipe is sealed by a wellhead blowout preventer, and all residual gas above the wellhead blowout preventer in the coalbed methane pressurized workover rig is led to a gas production well;
(5) the split blowout preventer is opened to loosen the external oil pipe, and the movable inner pipe is fallen back by using the power mechanism, so that the oil pipe hanger is completely exposed in the air;
(6) the tubing hanger is removed using an external removal device.
The invention relates to a coal bed gas pressurized well repairing method, wherein the plugging step of a plugging device in the step (2) comprises the following steps:
(a) putting the plug throwing device into an oil pipe in the well;
(b) when the plug throwing device descends, a sliding block is placed in a sliding block groove, so that the sliding block slides down along with the plug throwing device integrally, when an anti-skid opening device of the plug throwing device slides down to be in contact with a mechanical water pump, the plug throwing device is continuously pressed downwards by using a sucker rod, a conical sealing sleeve of the plug throwing device is opened, and finally the conical sealing sleeve completely seals between an oil pipe in a well and the plug throwing device;
(c) the sucker rod and other external devices are taken away.
The invention relates to a coal bed gas under-pressure well repairing method, wherein an external oil pipe is lifted by using an external lifting device in the step (4), and when a camera sees a cable clamp or an oil pipe centralizer, the operation steps are as follows:
(A) when the camera sees that the cable clip or the oil pipe centralizer reaches above the inner pipe flange, the wellhead blowout preventer seals the outer oil pipe;
(B) the inner pipe flange and the outer pipe flange are disassembled, and the movable inner pipe is lifted upwards by utilizing a power mechanism, so that the cable clamp or the oil pipe centralizer is exposed in the air;
(C) dismantling the cable clamp or the oil pipe centralizer by using an external dismantling device;
(D) and the movable inner pipe is fallen back downwards to the initial position by utilizing the power mechanism, and the outer pipe flange and the inner pipe flange are connected.
The invention relates to a coal bed gas under-pressure well repairing method, which further comprises the following steps:
(7) after the tubing hanger or a plurality of tubing hangers are removed, connecting a shield well device with the upper end of an oil tube in a well in the region of the removed tubing hanger, connecting the upper end of the shield well device with an upper oil tube, then dropping the shield well device to a position in the well which is convenient for a worker to operate and can seal gas between a gas production well and the oil tube in the well, and lifting an iron lifting rod of the shield well device by using an external lifting device to seal a well mouth by a sealing piece of the shield well device;
(8) the cable is lifted from the middle of the coal bed methane belt pressure well repairing device by using a tool, when the cable reaches a cable extraction port, the inner pipe flange is removed, the movable inner pipe is lifted upwards by using a power mechanism, and then the cable is extracted from the cable extraction port through a gap;
(9) and (4) restoring the lifting iron rod of the shield well device to the original position, so that the shield well device is convenient to take out.
The invention relates to a coal bed gas under-pressure well repairing method, which further comprises the following steps:
(10) when the mechanical water pump is seen by a camera, the external half-sealing device is placed on the upper part of a blowout prevention floating slip of the coal bed gas belt pressure workover rig, so that an external main body of the external half-sealing device wraps an upper oil pipe and a lower oil pipe which are connected with the upper end and the lower end of the mechanical water pump, an oil pipe clamp on the lower oil pipe is placed in a sealing structure lower half chamber of the external half-sealing device, and a first sealing structure and a second sealing structure of the external half-sealing device are in tight contact with the upper oil pipe and the lower oil pipe;
(11) the oil pipe clamp is unscrewed by using an external device, the upper oil pipe is lifted into the upper half chamber of the sealing structure, the first sealing sliding part and the second sealing sliding part of the external half-sealing device are pushed into the sealing sliding structure chamber by using the push rod, and then the first sealing sliding part and the second sealing sliding part are fastened with the sealing sliding structure chamber, so that the first sealing sliding part and the second sealing sliding part completely seal the lower half chamber of the sealing structure;
(12) the upper oil pipe is firstly lifted by using an external lifting device, and then the external semi-sealing device, the lower oil pipe, the sieve tube and the cable support barrel are lifted together.
After the scheme is adopted, the coal bed gas pressurized well repairing device and the well repairing method have the following beneficial effects:
1. the pressurized workover device and the pressurized workover method for the coal bed gas can realize pressurized workover operation, avoid the massive discharge of the coal bed gas in the well and protect the environment;
2. the coal bed gas is not discharged in the well repairing process, so that the safety of operators is effectively guaranteed;
3. the whole discharge of coal bed gas is avoided, and the productivity of the gas production well can be improved;
4. the coal bed gas is prevented from being completely discharged, the cost is saved, and the loss is reduced;
5. the coal bed gas pressurized well repairing device is compact in structural design, corresponding construction is carried out according to different conditions, and the operation is convenient.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a pressurized coal bed methane workover rig according to the invention;
FIG. 2 is a schematic structural view of a backup seal assembly of a second embodiment of the coalbed methane pressurized well servicing device of the present invention;
FIG. 3 is a schematic perspective view of a plug feeder used in the coalbed methane under-pressure well workover method of the present invention;
FIG. 4 is a schematic structural diagram of a shield well device used in the method for repairing a coal bed gas well under pressure according to the present invention;
FIG. 5 is a schematic front view of a semi-sealed sealing device used in the coalbed methane pressurized well workover method of the present invention;
FIG. 6 is a schematic side view of a semi-sealed sealing device used in the method for repairing a well under pressure in coalbed methane according to the present invention.
The invention will be further described by way of example with reference to the accompanying drawings.
Detailed Description
As shown in fig. 1, the coalbed methane pressurized workover rig of the present invention includes an upper sealing device for sealing an oil pipe and a lower sealing device installed at a wellhead.
The lower sealing device comprises a wellhead blowout preventer 1, the lower end of the wellhead blowout preventer 1 is fixedly connected with a wellhead flange plate 3 through a plurality of connecting bolts through a first connecting flange 2, and the upper end of the wellhead blowout preventer 1 is connected with the upper sealing device through a second connecting flange 4.
A first cable extraction port 5 and a second cable extraction port 6 are respectively arranged on the first connecting flange 2 and the second connecting flange 4, and a first camera 7 and a second camera 8 are respectively arranged on the first connecting flange 2 and the second connecting flange 4.
The wellhead blowout preventer 1 comprises a full-seal blowout preventer 9 and a half-seal blowout preventer 10, the full-seal blowout preventer 9 is in sealing connection with the half-seal blowout preventer 10, the half-seal blowout preventer 10 is in sealing connection with the upper end of the full-seal blowout preventer 9 in the embodiment, the lower end of the full-seal blowout preventer 9 is fixedly connected with a wellhead flange plate 3 through a first connecting flange 2, and the half-seal blowout preventer 10 is in sealing connection with an upper sealing device through a second connecting flange 4.
The totally enclosed blowout preventer 9 comprises two first shells 11, first sealing parts 12 made of rubber materials are arranged in inner cavities of the two first shells 11 respectively, the two first sealing parts 12 are connected with first hydraulic oil cylinders 13 respectively, the two first hydraulic oil cylinders 13 are installed on outer walls of the two first shells 11 respectively, and the two first hydraulic oil cylinders 13 can drive the two first sealing parts 12 to move, butt-joint and seal, so that a central space of equipment is sealed.
The semi-sealed blowout preventer 10 comprises two second housings 14, the two second housings 14 are connected to the upper ends of the two first housings 11, second sealing parts 15 made of rubber materials are respectively arranged in inner cavities of the two second housings 14, the two second sealing parts 15 are respectively connected with second hydraulic cylinders 16, and the two second hydraulic cylinders 16 can drive the two second sealing parts 15 to be in butt joint to form annular sealing rings capable of semi-sealing oil pipes.
The upper sealing device comprises a main body support 17, a first through hole 18 is formed in the center of the main body support 17, the lower end of the main body support 17 is connected with a second connecting flange 4, two third hydraulic oil cylinders 19 are connected to two opposite positions of the upper surface of the main body support 17, a split blowout preventer 20 is arranged between the cylinder bodies of the two third hydraulic oil cylinders 19, the split blowout preventer 20 comprises two fourth hydraulic oil cylinders 21, piston rods of the two fourth hydraulic oil cylinders 21 are connected with two third sealing elements 22 made of rubber materials, and the two fourth hydraulic oil cylinders 21 can drive the two third sealing elements 22 to move and butt to form a sealing ring to seal the oil pipe.
Piston rods of the two third hydraulic oil cylinders 19 are respectively connected with the first upper support 23 through adjustable bolts, a second through hole through which an oil pipe can pass is formed in the center of the first upper support 23, the first upper support 23 is connected with two blowout prevention moving slips 24, the two blowout prevention moving slips 24 are connected with the two fifth hydraulic oil cylinders 25, and the two fifth hydraulic oil cylinders 25 can drive the two blowout prevention moving slips 24 to be in butt joint and sealed to clamp the oil pipe.
The main body support 17 is connected with an immovable outer tube 26, the inner cavity of the immovable outer tube 26 is communicated with the first through hole 18, a movable inner tube 27 is arranged above the immovable outer tube 26, the lower end of the movable inner tube 27 extends into the inner cavity of the immovable outer tube 26, the upper end of the immovable outer tube 26 is connected with an outer tube flange 28, the lower end of the movable inner tube 27 is connected with an inner tube flange 29, the outer tube flange 26 and the inner tube flange 27 are connected together through a detachable connecting piece, the detachable connecting piece of the embodiment adopts a plurality of connecting bolts, and the immovable outer tube 26 and the movable inner tube 27 are communicated or separated through a power. The power mechanism of the embodiment comprises two sixth hydraulic oil cylinders 30, the cylinder bodies of the two sixth hydraulic oil cylinders 30 are fixed on the main body support 17, the piston rods of the two sixth hydraulic oil cylinders 30 are connected with a second upper support 31, and the movable inner pipe 27 is connected with the second upper support 31.
The movable inner pipe 27 and the first connecting flange 2 are communicated with each other through a connecting pipe 35, and a vacuum pump 36 is mounted on the connecting pipe 35.
As shown in fig. 2, the spare seal assembly of the second embodiment of the coalbed methane pressurized well workover rig of the present invention is a structural schematic diagram, and the spare seal assembly can replace a wellhead blowout preventer or a split blowout preventer in the first embodiment, and comprises a main body support 37, the main body support 37 can be connected with the first connecting flange 2 or the first cylinder upper support 23, a third through hole 38 is arranged at the center of the main body support 37, two seventh hydraulic cylinders 39 are connected to the left and right sides of the main body support 37, clamp members 40 are respectively connected to piston rods at the upper ends of the two seventh hydraulic cylinders 39, a revolving body with a T-shaped cross section is formed when the two clamp members 40 are butted, a fourth through hole 41 is formed at the center of the T-shaped revolving body, the lower part of the fourth through hole 41 is a tapered hole with a small upper end and a large lower end, two fourth seal members 42 made of rubber material are arranged below the clamp member 40 and in the third through hole 38 of the main, the upper parts of the two fourth sealing elements 42 abut against the lower parts of the opposite surfaces of the two clamping hoop elements 40, and when the two clamping hoop elements 40 move downwards along with the two seventh hydraulic oil cylinders 39, the two fourth sealing elements 42 are driven to move relatively, so that the oil pipe is sealed and clamped.
With reference to the structure of the coalbed methane pressurized workover device shown in fig. 1 and with reference to fig. 3 to 6, the coalbed methane pressurized workover method of the present invention includes the following steps:
(1) the first connecting flange 2 of the coal bed gas pressurized well repairing device is tightly connected and fixed with a wellhead flange 3 through a plurality of connecting bolts, an external lifting device is utilized to lift all the sucker rods in the well upwards, and the leakage of the coal bed gas is not involved in the process, so that the sealing is not needed, the sequence of the two processes of the extraction of the sucker rods and the installation of the coal bed gas pressurized well repairing device can be mutually exchanged, and the invention belongs to the protection scope;
(2) after the sucker rod is completely put forward, some gas possibly leaks from the oil pipe in the well, so the sucker rod needs to put in the plug throwing device to the oil pipe in the well, under general conditions, liquid exists in the well and can press the gas under water, therefore the problem of gas leakage generally cannot occur immediately after the sucker rod is taken out, but along with the subsequent putting forward of the oil pipe in the well, the liquid level is lowered to cause the gas leakage, and the plug throwing device is used to seal the oil pipe in the well for avoiding the occurrence of the situation. Referring to fig. 3, the plug comprises a tubular plug body 43, a slider groove 44 is provided on the outer side wall of the plug body 43, and a slider 45 is placed in the slider groove 44. The slider 45 is a trapezoidal block matching the shape of the slider slot 44. The lower end of the plug throwing device body 43 is tightly sleeved with a conical sealing sleeve 46, and the lower end of the sealing sleeve 46 is tightly sleeved with the upper end of an anti-slip opening piece 47. The anti-slip spreader 47 comprises a cylindrical spreader body 48, and a conical base 49 is arranged at the lower end of the spreader body 48. The upper end of the spreader body 48 is provided with a tapered buffer portion 49, the upper end of the buffer portion 49 is provided with a connecting portion 50, and the upper outer surface of the connecting portion 50 is provided with a plurality of annular retaining trapezoidal grooves 51 arranged at intervals. The connecting part 50 of the anti-skid spreader 47 passes through the inner cavity of the sealing sleeve 46 and then extends into the lower end of the inner cavity of the plug feeder body 43, and the lower end of the sealing sleeve 46 is sleeved with the lower part of the connecting part 50. The inner cavity of the plug throwing main body 43 is provided with a fixture block assembly which can be clamped with the anti-return trapezoidal groove 51 on the upper part of the connecting part 50 of the anti-slip opening piece 47, the fixture block assembly comprises an opening 52 arranged on the lower part of the side wall of the plug throwing main body 43, a fixture block 53 is placed on the opening 52, the fixture block 53 is fixed on the opening 52 through a rubber belt, and the fixture block 53 is clamped between the plug throwing main body 43 and the anti-return trapezoidal groove 51 of the anti-slip opening piece 47. When the sucker rod plugging device is used, the upper part of the plugging device is connected to the sucker rod, the purpose is that after the plugging device is contacted with the mechanical water pump 54, if the well oil pipe cannot be well sealed, the plugging device can be pressed downwards by using the sucker rod to completely seal the well oil pipe, then the sucker rod is screwed off and lifted out, but the sucker rod is not normally connected with the sucker rod, the well oil pipe can be sealed by directly depending on gravity, then the plugging device is put into the well oil pipe, the plugging device can automatically slide down to a proper position contacted with the mechanical water pump 54, in the descending process of the plugging device, the sliding block 45 is put into the sliding block groove 44, the sliding block 45 slides down along with the plugging device integrally, and in the descending process, because the sliding block 45 is of a trapezoidal structure, the sliding block 45 can be concealed in the sliding block groove 44, and the sliding of the whole equipment cannot be influenced. The clamping block 53 is put into the opening 52 at the beginning, the clamping block 53 is fixed by the rubber belt, when the anti-skid opening piece 47 slides downwards to be contacted with the mechanical water pump 54, the anti-skid opening piece 47 is continuously pressed downwards to a proper position by the sucker rod, at the moment, the conical sealing sleeve 46 is expanded under the action of the opening piece main body 48 of the anti-skid opening piece 47 until the conical sealing sleeve 46 completely seals the air gap between the oil pipe in the well and the plug feeder, and then the sucker rod and other external devices are taken away. In the process of pressing the plug throwing device by using the sucker rod, the anti-skid strut 47 is not moved, the clamping block 53 is clamped on the anti-skid strut 47 when the plug throwing device slides down for a certain depth, the conical sealing sleeve 46 can be prevented from rebounding at the moment, when the anti-skid strut 47 is not pressed down any more, the sliding block 45 can slide out of the sliding block groove 44 under the action of gravity, so that the sliding block 45 can be clamped between an oil pipe in a well and the plug throwing device, if gas impacts the plug throwing device upwards, the sliding block 45 can be clamped between the oil pipe in the well and the plug throwing device more and more tightly, the plug throwing device is ensured not to slide upwards, and the oil pipe in the well is sealed;
(3) an external oil pipe with proper length and proper size downwards passes through the middle space of the coalbed methane pressurized well repairing device and then is placed at the wellhead by using an external lifting device, then the external oil pipe is connected with an oil pipe hanger 55 connected with the upper end of an underground oil pipe, the lower end of the external oil pipe is provided with an external screw thread, the oil pipe hanger 55 is provided with an internal screw thread, and the external oil pipe and the internal screw thread are connected together in a screw connection and matching mode through the external screw thread and the internal screw thread. The external tubing is then sealed with the split blow out preventer 20 of the coalbed methane pressurized well intervention apparatus, with the specific operations: the two third sealing elements 22 are pressed inwards by using the two fourth hydraulic oil cylinders 21, and when the two third sealing elements 22 completely seal the air gap between the oil pipe in the well and the coalbed methane pressurized well repairing device, the two fourth hydraulic oil cylinders 21 are stopped to work;
(4) lifting the external oil pipe by using an external lifting device, then observing the condition inside the coalbed methane pressurized workover rig by using a first camera 7, when a tubing hanger 55 can be seen by the first camera 7, opening a connecting bolt between the fixed outer pipe 26 and the movable inner pipe 27, separating the fixed outer pipe 26 from the movable inner pipe 27 (sealing the fixed outer pipe 26 and the movable inner pipe 27 by using a sealing piece similar to a hydraulic oil cylinder driving sealing piece to seal the oil pipe in the separation process), and lifting the movable inner pipe 27 to a preset position by using two sixth hydraulic oil cylinders 30, stopping lifting the oil pipe in the well and the movable inner pipe 27, then enabling the wellhead blowout preventer 1 to seal the external oil pipe, wherein the sealing way is that the second hydraulic oil cylinder 16 of the wellhead blowout preventer 1 inwards presses the external oil pipe, at the moment, completely sealing the gas below the wellhead blowout preventer 1, and enabling the equipment above the wellhead blowout preventer 1 to be operated arbitrarily, however, after the wellhead blowout preventer 1 is completely sealed, part of gas still exists in the equipment above the wellhead blowout preventer 1, and the gas existing above the equipment can be led into the well below the wellhead blowout preventer 1 through the connecting pipeline 35 and the vacuum pump 36 arranged on the connecting pipeline;
(5) two fourth hydraulic cylinders 21 of the split blowout preventer 20 drive the two third sealing elements 22 to be opened, so that the external oil pipe is loosened, the movable inner pipe 27 is dropped back to the initial position by using the sixth hydraulic cylinders 30, and the oil pipe hanger 55 is completely exposed to the air;
(6) tubing hanger 55 is removed using an external removal device.
(7) After the tubing string 55 or several tubing strings are removed, the lower part of a shield well device is connected with the upper end of the tubing string in the well in the area of the removed tubing string 55, the upper end of the shield well device is connected with an upper tubing string, and then the shield well device is dropped to a proper position in the well, so that the shield well device is convenient for operators to operate and can seal the gas between the gas production well and the tubing string in the well. Lifting is carried out by using an external hydraulic, pneumatic or manual lifting device, as shown in fig. 4, the shield well device comprises a shield well device main body 56, a through hole penetrating through the upper end and the lower end is arranged at the center part of the shield well device main body 56, a lifting rod 57 is arranged in the through hole, a fifth sealing member 58 made of rubber material is arranged at the upper part between the inner cavity of the through hole of the shield well device main body 56 and the lifting rod 57, a sixth sealing member 59 made of rubber material is arranged at the middle circle of the outer surface of the shield well device main body 56, a fixing member 60 made of metal material is arranged at the upper end of the sixth sealing member 59, the upper end of the fixing member 60 is conical, an open groove penetrating through the left side and the right side is arranged at the lower part of the shield well device main body 56, a trapezoid 61 is arranged in the open groove, a conical member 62 made of metal material is arranged at the upper end of the trapezoid, the upper end of the conical member, an annular seventh seal 63 is provided on the lower end of the outer surface of the shield well tool body 56 to seal the engagement of the sealing cone 62 with the shield well tool body 56. The lifting rod 57 is fixedly connected with the trapezoidal piece 61 through the locking nut 64, the lifting rod 57 is lifted upwards to drive the trapezoidal piece 61 to move upwards along the open slot, the trapezoidal piece 61 drives the conical piece 62 to lift upwards, at the moment, the upper end of the conical piece 62 is conical, the sixth sealing piece 59 is propped open, and when the conical piece 62 is lifted to a proper position, the sixth sealing piece 59 seals the gas production wellhead and seals the sleeving inner wall, the wellhead inner wall or the equipment inner wall;
(8) the cable is lifted upwards from the middle of the coal bed methane pressurized well repairing device by using tools such as an external clamp, the position of the cable is observed by using the first camera 7, when the cable reaches the first cable extraction port 5, the inner pipe flange 29 is detached, then the movable inner pipe 27 is lifted upwards by using the two sixth hydraulic oil cylinders 30, then the cable is extracted from a gap through the first cable extraction port 5 and a sealing port is extruded by using rubber, so that the sealing effect is achieved, and the purpose of separating and extracting the cable from an oil pipe in the well can be achieved;
(9) the lifting rod 57 of the shield well device is restored to the original position, and at the moment, the fixing piece 60 is fixed, the sixth sealing piece 59 is pulled back to the original position, so that the shield well device can be taken out;
(10) when the last wellbore tubing (the wellbore tubing connected to the downhole mechanical pump 54) is lifted, since the plug is in this wellbore tubing, if the wellbore tubing is still lifted from the mechanical pump 54 in the manner described above, the screen 65 and cable basket 66 underneath it cannot seal the wellbore tubing, which would result in gas leaking out of the wellbore tubing, and therefore an external semi-seal is used here for operation. Referring to fig. 5 and 6, the outer half seal comprises an outer body 67 formed by two pairs of semicircular outer halves joined together and having a first passage extending through the upper and lower ends at the center thereof. The upper, middle and lower parts of the first channel are respectively provided with an annular open slot. The inner body 68 is installed in the inner cavity of the first passage, the inner body 68 is provided with a second passage which penetrates through the upper end and the lower end and is used for the upper oil pipe 76 to pass through, the upper part and the lower part of the inner cavity of the second passage are respectively provided with an annular groove, and the upper annular groove and the lower annular groove are respectively provided with a first sealing structure 69 and a second sealing structure 70 which are made of rubber materials. A sealing sliding structure chamber 71 is installed on an opening groove in the middle of the first channel, and hermetically separates the second channel into a sealing structure upper half chamber 77 and a sealing structure lower half chamber 78, the sealing sliding structure chamber 71 is a cuboid box body, a through hole which penetrates through the upper end and the lower end of the sealing sliding structure chamber and is used for an upper oil pipe 76 to pass through is arranged on the sealing sliding structure chamber, a first sealing sliding part 72 made of rubber materials and a second sealing sliding part 73 made of metal materials are arranged in an inner cavity of the sealing sliding structure chamber 71, a push rod 74 is connected to the left end of the second sealing sliding part 73, the left end of the push rod 74 penetrates through a left plate of the sealing sliding structure chamber 71 in a sealing mode, and the first sealing sliding part 72 can seal or open the through hole of the lower plate of. A plurality of fastening bolts 75 penetrate through the inner cavity of the sealing sliding structure chamber 71 and then press against the second sealing sliding part 73, and press the first sealing sliding part 72 downwards through the second sealing sliding part 73, so that the sealing sliding structure chamber 71 can seal and isolate the second channel into a sealing structure upper half chamber 77 and a sealing structure lower half chamber 78. A hollow main body support 79 is arranged above the outer main body 67, the lower end of the main body support 79 is connected with a double semicircular closing piece 80 made of metal material through bolts, the upper end of the main body support 79 is connected with a rope mounting support 81, two closing ropes 82 are connected between the left side and the right side of the rope mounting support 81 and the left side and the right side of the outer main body 67, an oil pipe clamp 83 is arranged between the second sealing structure 70 and the upper oil pipe 76, the lower end of the oil pipe clamp 83 is connected with a lower oil pipe 84, and the lower oil pipe 84 penetrates out of the outer main body 67. When the first camera 7 sees the mechanical water pump 54, the external half-sealing device is placed on the anti-blowout traveling slips 24 of the coal bed methane belt pressure workover rig, the outer body 67 of the external half-sealing device wraps the upper oil pipe 76 and the lower oil pipe 84 connected to the upper end and the lower end of the mechanical water pump 54, the oil pipe clamp 83 is placed between the second sealing structure 70 and the lower part of the upper oil pipe 76, the first sealing structure 69 and the second sealing structure 70 of the external half-sealing device are in tight contact with the upper oil pipe 76 and the lower oil pipe 84 to play a role in sealing air gaps among the upper oil pipe 76, the lower oil pipe 84 and the external half-sealing device, at the moment, the two fourth hydraulic cylinders 21 of the open-type blowout preventer 20 are outwards loosened, and the two third sealing elements 22 are loosened so as to leave a larger gap;
(11) the oil pipe clamp 83 is unscrewed by an external mechanical device, then the upper oil pipe 76 is lifted upwards into the upper half chamber 77 of the sealing structure, the first sealing slide 72 and the second sealing slide 73 are pushed into the sealing sliding structure chamber 71 by the push rod 74, and at the moment, the first sealing slide 72 and the second sealing slide 73 are pressed downwards by the plurality of fastening bolts 75 until the lower half chamber 78 of the sealing structure can be completely sealed by the first sealing slide 72;
(12) the upper tubing 76 is first lifted out using an external lifting device, and then the outer semi-seal, lower tubing 84, screen 65 and cable tray 66 are lifted out together.
In addition, when the external tubing is lifted by the external lifting device in the step (4), the operation steps when the first camera 7 observes the cable clamp 85 or the tubing centralizer 86 are as follows:
(A) when the first camera observes that the cable clamp 85 or the tubing centralizer 86 reaches the position above the inner pipe flange 29, the full-seal blowout preventer 9 or the half-seal blowout preventer 10 of the wellhead blowout preventer 1 seals the outer tubing, at the moment, gas below the full-seal blowout preventer 9 or the half-seal blowout preventer 10 is completely sealed, and equipment above the full-seal blowout preventer 9 or the half-seal blowout preventer 10 can be operated randomly;
(B) the inner tube flange 29 and the outer tube flange 28 are disassembled and the movable inner tube 27 is lifted upwards by two sixth hydraulic rams 30 to expose the cable clamps 85 or the tubing centralizer 86 to the atmosphere;
(C) the cable clamp 85 or the tubing centralizer 86 is removed by an external removal device;
(D) the movable inner tube 27 is dropped back down to the initial position by two sixth hydraulic rams 30 to connect the outer tube flange 28 with the inner tube flange 29.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (15)
1. The coal bed methane belt pressure well repairing device is characterized by comprising an upper sealing device and a lower sealing device, wherein the upper sealing device is used for sealing an oil pipe, the lower sealing device is installed at a wellhead, the lower sealing device comprises a wellhead blowout preventer or a sealing assembly, the lower end of the wellhead blowout preventer or the sealing assembly is fixedly connected with a wellhead flange plate through a first connecting flange, and the upper end of the wellhead blowout preventer or the sealing assembly is connected with the upper sealing device through a second connecting flange.
2. The coal bed methane pressurized well workover device according to claim 1, wherein the wellhead blowout preventer comprises a full blowout preventer and a half blowout preventer, the semi-closed blowout preventer is connected with the fully-closed blowout preventer in a sealing manner, the fully-closed blowout preventer comprises two first shells, first sealing parts are respectively arranged in inner cavities of the two first shells, the two first sealing parts are respectively connected with a first hydraulic oil cylinder, the two first hydraulic oil cylinders can drive the two first sealing parts to be in butt joint sealing, the semi-sealed blowout preventer comprises two second shells, wherein the two second shells are connected to the upper ends of the two first shells, the inner cavities of the two second shells are respectively provided with a second sealing element, the two second sealing elements are respectively connected with a second hydraulic cylinder, and the two second hydraulic cylinders can drive the two second sealing elements to be in butt joint to form an annular sealing ring of a semi-sealed oil pipe.
3. The coal bed gas under-pressure well repairing device according to claim 1, wherein cable extraction ports are formed in the first connecting flange and the second connecting flange, and cameras are mounted on the first connecting flange and the second connecting flange.
4. The coal bed gas pressurized well repairing device according to claim 1, wherein the upper sealing device comprises a main body support, a first through hole is formed in the center of the main body support, the lower end of the main body support is connected with the second connecting flange, two third hydraulic cylinders are connected to two opposite positions of the upper surface of the main body support, a split blowout preventer or a sealing assembly is arranged between the two third hydraulic cylinder bodies, the split blowout preventer comprises two fourth hydraulic cylinders, piston rods of the two fourth hydraulic cylinders are connected with two third sealing elements, and the two fourth hydraulic cylinders can drive the two third sealing elements to be in butt joint with a sealing oil pipe.
5. The coal bed gas under-pressure well repairing device according to claim 4, wherein piston rods of the two third hydraulic cylinders are respectively connected with a first upper support through adjustable bolts, a second through hole through which an oil supply pipe can penetrate is formed in the center of the first upper support, the first upper support is connected with two blowout prevention moving slips, the two blowout prevention moving slips are connected with two fifth hydraulic cylinders, and the two fifth hydraulic cylinders can drive the two blowout prevention moving slips to be in butt joint sealing to clamp the oil pipe.
6. The coal bed gas under-pressure well workover device according to claim 5, wherein a fixed outer pipe is connected to the main body support, an inner cavity of the fixed outer pipe is communicated with the first through hole, a movable inner pipe is arranged above the fixed outer pipe, the lower end of the movable inner pipe extends into the inner cavity of the fixed outer pipe, the upper end of the fixed outer pipe is connected with the movable inner pipe through a detachable connecting piece, and the fixed outer pipe and the movable inner pipe are communicated or separated through a power mechanism.
7. The coal bed gas pressurized well repairing device according to claim 6, wherein an outer pipe flange is connected to the upper end of the fixed outer pipe, an inner pipe flange is connected to the lower end of the movable inner pipe, and the outer pipe flange and the inner pipe flange are connected together through the detachable connecting piece.
8. The coal bed gas under-pressure well repairing device according to claim 6, wherein the power mechanism comprises two sixth hydraulic oil cylinders, cylinder bodies of the two sixth hydraulic oil cylinders are fixed on the main body support, piston rods of the two sixth hydraulic oil cylinders are connected with a second upper support, and the second upper support is connected with the movable inner pipe.
9. The coal bed gas pressurized well repairing device according to claim 6, wherein the movable inner pipe is communicated with the first connecting flange through a connecting pipeline, and a vacuum pump is installed on the connecting pipeline.
10. The coal bed methane under-pressure well workover device according to claim 1 or 5, wherein the sealing assembly comprises a main body support connected with the first connecting flange or the first upper support, a third through hole is formed in the center of the main body support, two seventh hydraulic cylinders are connected to two sides of the main body support, clamp members are respectively connected to piston rods at the upper ends of the two seventh hydraulic cylinders, the two clamp members form a T-shaped revolving body with a cross section when in butt joint, a fourth through hole is formed in the center of the T-shaped revolving body, a conical hole with a small upper end and a large lower end is formed in the lower portion of the fourth through hole, two fourth sealing members are arranged in the third through hole of the main body support below the clamp members, the upper portions of the two fourth sealing members abut against the lower portions of the opposite surfaces of the two clamp members, and when the two clamp members move downwards along with the two seventh hydraulic cylinders, and the two fourth sealing elements are driven to move relatively, so that the oil pipe is clamped in a sealing manner.
11. A coal bed methane belt pressure well repairing method is characterized by comprising the following steps:
(1) tightly connecting and fixing a first connecting flange of the coal bed gas pressurized well repairing device with a wellhead flange plate, and completely lifting a sucker rod in a well upwards by using an external lifting device, wherein the two processes can be replaced sequentially;
(2) after the sucker rod is completely lifted out, throwing the plug throwing device into the oil pipe in the well, so that the plug throwing device seals the oil pipe in the well;
(3) an external oil pipe downwards passes through the coalbed methane pressurized workover rig by using an external lifting device and then is put at a wellhead, the external oil pipe is connected with an oil pipe hanger connected with the upper end of the oil pipe in the well, and then the external oil pipe is sealed by using a split blowout preventer of the coalbed methane pressurized workover rig;
(4) the external oil pipe is lifted by using an external lifting device, when the oil pipe hanger is observed by a camera, the fixed outer pipe is separated from the movable inner pipe, the movable inner pipe is lifted to a preset position by using a power mechanism, then the external oil pipe is sealed by a wellhead blowout preventer, and all residual gas above the wellhead blowout preventer in the coalbed methane pressurized workover rig is led to a gas production well;
(5) the split blowout preventer is opened to loosen the external oil pipe, and the movable inner pipe is fallen back by using the power mechanism, so that the oil pipe hanger is completely exposed in the air;
(6) the tubing hanger is removed using an external removal device.
12. The method for repairing a well under pressure of coal bed gas according to claim 11, wherein the plugging step of the plug thrower in the step (2) is as follows:
(a) putting the plug throwing device into an oil pipe in the well;
(b) when the plug throwing device descends, a sliding block is placed in a sliding block groove, so that the sliding block slides down along with the plug throwing device integrally, when an anti-skid opening device of the plug throwing device slides down to be in contact with a mechanical water pump, the plug throwing device is continuously pressed downwards by using a sucker rod, a conical sealing sleeve of the plug throwing device is opened, and finally the conical sealing sleeve completely seals between an oil pipe in a well and the plug throwing device;
(c) the sucker rod and other external devices are taken away.
13. The method for repairing a well under pressure of coal bed gas according to claim 11, wherein in the step (4), an external oil pipe is lifted by using an external lifting device, and when a cable clamp or an oil pipe centralizer is seen by a camera, the operation steps are as follows:
(A) when the camera sees that the cable clip or the oil pipe centralizer reaches above the inner pipe flange, the wellhead blowout preventer seals the outer oil pipe;
(B) the inner pipe flange and the outer pipe flange are disassembled, and the movable inner pipe is lifted upwards by utilizing a power mechanism, so that the cable clamp or the oil pipe centralizer is exposed in the air;
(C) dismantling the cable clamp or the oil pipe centralizer by using an external dismantling device;
(D) and the movable inner pipe is fallen back downwards to the initial position by utilizing the power mechanism, and the outer pipe flange and the inner pipe flange are connected.
14. The method for repairing a well under pressure of coal bed gas according to claim 11, further comprising:
(7) after the tubing hanger or a plurality of tubing hangers are removed, connecting a shield well device with the upper end of an oil tube in a well in the region of the removed tubing hanger, connecting the upper end of the shield well device with an upper oil tube, then dropping the shield well device to a position in the well which is convenient for a worker to operate and can seal gas between a gas production well and the oil tube in the well, and lifting an iron lifting rod of the shield well device by using an external lifting device to seal a well mouth by a sealing piece of the shield well device;
(8) the cable is lifted from the middle of the coal bed methane belt pressure well repairing device by using a tool, when the cable reaches a cable extraction port, the inner pipe flange is removed, the movable inner pipe is lifted upwards by using a power mechanism, and then the cable is extracted from the cable extraction port through a gap;
(9) and (4) restoring the lifting iron rod of the shield well device to the original position, so that the shield well device is convenient to take out.
15. The coalbed methane pressurized well workover method according to claim 14, further comprising:
(10) when the mechanical water pump is seen by a camera, the external half-sealing device is placed on the upper part of a blowout prevention floating slip of the coal bed gas belt pressure workover rig, so that an external main body of the external half-sealing device wraps an upper oil pipe and a lower oil pipe which are connected with the upper end and the lower end of the mechanical water pump, an oil pipe clamp on the lower oil pipe is placed in a sealing structure lower half chamber of the external half-sealing device, and a first sealing structure and a second sealing structure of the external half-sealing device are in tight contact with the upper oil pipe and the lower oil pipe;
(11) the oil pipe clamp is unscrewed by using an external device, the upper oil pipe is lifted into the upper half chamber of the sealing structure, the first sealing sliding part and the second sealing sliding part of the external half-sealing device are pushed into the sealing sliding structure chamber by using the push rod, and then the first sealing sliding part and the second sealing sliding part are fastened with the sealing sliding structure chamber, so that the first sealing sliding part and the second sealing sliding part completely seal the lower half chamber of the sealing structure;
(12) the upper oil pipe is firstly lifted by using an external lifting device, and then the external semi-sealing device, the lower oil pipe, the sieve tube and the cable support barrel are lifted together.
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| CN202011285226.2A CN112227997A (en) | 2020-11-17 | 2020-11-17 | Coal bed gas pressurized well repairing device and well repairing method |
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