CN210422533U - Shaft cleaning string for cave completion - Google Patents
Shaft cleaning string for cave completion Download PDFInfo
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- CN210422533U CN210422533U CN201921476450.2U CN201921476450U CN210422533U CN 210422533 U CN210422533 U CN 210422533U CN 201921476450 U CN201921476450 U CN 201921476450U CN 210422533 U CN210422533 U CN 210422533U
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Abstract
The utility model discloses a pit shaft cleaning pipe post of cave well completion includes power oil pipe, bailing pump and support screen pipe, specifically does, and the piston rod and the power oil pipe of bailing pump are connected, and the sand storage oil pipe and the support screen pipe of bailing pump are connected. According to the shaft cleaning pipe column for cave well completion, the supporting screen pipe can descend along with the cleaning process of a sand face collapsed in a shaft by the bailing pump, namely the supporting screen pipe can descend along with the descending of the sand face collapsed in the shaft in real time, and the shaft in the cleaning process is protected in real time, so that the problem that the shaft of a coal-bed gas well of the cave well completion cannot be cleaned due to serious leakage and serious collapse drilling clamping risk is solved, the supporting screen pipe can be lost in the shaft after the shaft is cleaned, effective support for the shaft after the shaft is cleaned is realized, the shaft can be cleaned again conveniently in the later period, and the gas production capacity of the shaft is recovered.
Description
Technical Field
The utility model relates to a coal bed gas technical field, in particular to pit shaft clearance tubular column of cave well completion.
Background
The coalbed methane is hydrocarbon gas which is stored in a coalbed and takes methane as a main component, is mainly adsorbed on the surface of coal matrix particles, is partially dissociated in coal pores or dissolved in coalbed water, and is an associated mineral resource of coal.
In order to improve the development benefit of coal bed gas, cave completion is adopted for some special coal beds. Cave completion is a particular completion technique. Specifically, firstly, a casing is put in, the casing in the coal seam section is a glass fiber reinforced plastic casing, then well cementation is carried out, finally, a hydraulic cutting and hole expanding tool is put in, a cave is made at the glass fiber reinforced plastic casing in the coal seam section, well completion is carried out, and communication between the well and the coal seam is realized.
The coal seam is an under-pressure reservoir, and the cave section of the coal seam gas well collapses to cause the shaft of the cave section to be buried, so that the normal production of the coal seam gas well can be ensured after the shaft is cleaned.
In the prior art, the shaft of the cave section collapses again due to reservoir stratum, so that the drill is stuck, namely the drilling tool is sunk in the shaft and cannot move freely, the shaft cannot be cleaned continuously, and the coal-bed gas well is scrapped.
Therefore, how to achieve effective cleaning of the wellbore to recover the production of the coal bed gas well becomes a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a pit shaft cleaning string of cave completion to realize the effective washing of pit shaft, in order to resume the production of coal bed gas well.
In order to achieve the above object, the utility model provides a following technical scheme:
a wellbore cleaning string for cavern completion comprising:
a power oil pipe;
the bailing pump comprises a piston rod, a pump barrel, a sand storage oil pipe and a sand shovel from top to bottom in sequence,
the piston rod is connected with the power oil pipe, a circulation cavity is arranged in the piston rod and is communicated with the shaft through a one-way valve, a piston is arranged at the tail end of the piston rod, a piston hole communicated with the circulation cavity and the sand storage oil pipe is arranged on the piston,
the pump cylinder is sleeved on the piston rod,
the sand storage oil pipe is connected with the lower end of the pump barrel, the lower end of the sand storage oil pipe is provided with a bottom valve,
the sand shovel is arranged at the lower end of the sand storage oil pipe; and
and the supporting sieve tube is connected with the sand storage oil pipe through a release, and the lower end of the supporting sieve tube is higher than the sand shovel.
Preferably, in the shaft cleaning pipe column for cave completion, the release is a buckle joint, the buckle joint is provided with an inner cylinder and an outer cylinder connected with the inner cylinder, the upper end of the inner cylinder is connected with the pump cylinder, the lower end of the inner cylinder is connected with the sand storage oil pipe, and the lower end of the outer cylinder is connected with the upper end of the support screen pipe.
Preferably, in the shaft cleaning string for cave completion, the inner cylinder is connected with the pump cylinder through a first thread, the inner cylinder is connected with the sand storage oil pipe through a second thread, the outer cylinder is connected with the supporting screen pipe through a third thread, the thread directions of the first thread and the second thread are the same, and the thread directions of the second thread and the third thread are opposite.
Preferably, in the wellbore clearing string for cavern completion, the diameter of the support screen is 20-60mm smaller than the diameter of the wellbore.
Preferably, in the wellbore cleanup string for cavern completion described above,
the diameter of the pump cylinder is 110-150 mm;
the length of the support screen is greater than or equal to the sum of the length of the cavity section of the shaft and the length of the pocket.
Preferably, in the wellbore-cleaning string for cavernous completion, the piston rod is a regular prism piston rod.
Preferably, the shaft cleaning string for cave completion further comprises a support plate for collecting coal briquettes, the support plate is connected with the inner wall of the sand storage oil pipe, and the number of the support plates is multiple and is uniformly arranged along the inner wall of the sand storage oil pipe.
Preferably, in the wellbore cleaning string for cave completion, the support plate is an arc support plate or a semi-conical support plate.
Preferably, in the wellbore clearing string for cavern completion described above, the base valve comprises:
the valve seat is connected with the pipe wall of the sand storage oil pipe, a valve port for coal blocks, coal powder and the like to pass through is arranged on the valve seat, and the diameter of the valve port is 20-40mm smaller than that of the sand storage oil pipe;
and the valve plate is used for plugging the valve port and is connected with the valve seat through a hinge.
Preferably, in the wellbore clearing string for cavern completion described above, the sand shovel comprises:
the fixed cylinder is connected with the sand storage oil pipe;
the crushing teeth are arranged on the fixed cylinder and used for crushing coal blocks, and wear-resistant layers are arranged on the crushing teeth.
According to the above technical scheme, the utility model provides a pit shaft cleaning string of cave completion includes power oil pipe, bailing pump and support screen pipe, specifically does, and the piston rod and the power oil pipe of bailing pump are connected, and the storage sand oil pipe and the support screen pipe of bailing pump are connected.
The method comprises the following steps that a bailing pump and a support screen pipe are lowered into a resistance position of a cave well completion through a power oil pipe, a sand shovel of the bailing pump crushes collapsed sand surfaces in a shaft of a cave section, the power oil pipe is lifted up to drive a piston rod of the bailing pump to move upwards to the highest position of a pump barrel, a one-way valve is closed at the moment, a bottom valve is opened, negative pressure is formed in the pump barrel and a sand storage oil pipe, coal blocks, coal powder and the like in the cave section are sucked into the sand storage oil pipe at high speed and layered in the sand storage oil pipe (the upper layer is liquid, the lower layer is solid such as the coal blocks, the coal powder and the like), the collapsed sand surfaces in the shaft descend, and the sand storage oil pipe and the support screen pipe sink; after pumping is finished, lowering the power oil pipe to push the piston rod to move downwards in the pump cylinder, opening the check valve, closing the bottom valve, and discharging upper-layer liquid in the sand storage oil pipe to a shaft through the check valve after entering the circulation cavity through the piston hole; and repeating the steps of lifting the power oil pipe and lowering the power oil pipe until the sand shovel is contacted with the bottom of the artificial well, namely the cleaning of the collapsed sand surface in the shaft of the cave section is finished, at the moment, the support screen pipe is placed in the shaft through the release, and the sand bailing pump and the release are lifted out of the shaft through the power oil pipe.
According to the shaft cleaning pipe column for cave well completion, the supporting screen pipe can descend along with the cleaning process of a sand face collapsed in a shaft by the bailing pump, namely the supporting screen pipe can descend along with the descending of the sand face collapsed in the shaft in real time, and the shaft in the cleaning process is protected in real time, so that the problem that the shaft of a coal-bed gas well of the cave well completion cannot be cleaned due to serious leakage and serious collapse drilling clamping risk is solved, the supporting screen pipe can be lost in the shaft after the shaft is cleaned, effective support for the shaft after the shaft is cleaned is realized, the shaft can be cleaned again conveniently in the later period, and the gas production capacity of the shaft is recovered.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a wellbore cleanup string for cavern completion provided by an embodiment of the present invention;
fig. 2 is a schematic structural view of coal bailing on a piston rod of a shaft cleaning string for cave completion according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of piston rod lowering drainage of a wellbore cleaning string for cave completion provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a wellbore cleaning string for cave completion after cleaning a wellbore according to an embodiment of the present invention;
fig. 5 is a schematic structural view of the sand storage oil pipe and the sand shovel provided by the embodiment of the utility model.
1. The device comprises a power oil pipe, 2, a piston rod, 3, a pump cylinder, 4, a sand storage oil pipe, 5, a sand shovel, 6, a one-way valve, 7, a bottom valve, 8, a support sieve pipe, 9, a releasing tool, 10 and a supporting plate.
Detailed Description
The utility model discloses a pit shaft cleaning pipe column of cave completion to realize the effective washing of pit shaft, with the production of recovering coal bed gas well.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-5, fig. 1 is a schematic structural diagram of a wellbore cleaning string for cavern completion according to an embodiment of the present invention; fig. 2 is a schematic structural view of coal bailing on a piston rod of a shaft cleaning string for cave completion according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of piston rod lowering drainage of a wellbore cleaning string for cave completion provided by an embodiment of the present invention; fig. 4 is a schematic structural diagram of a wellbore cleaning string for cave completion after cleaning a wellbore according to an embodiment of the present invention; fig. 5 is a schematic structural view of the sand storage oil pipe and the sand shovel provided by the embodiment of the utility model.
The utility model discloses a pit shaft clearance tubular column of cave completion, including power oil pipe 1, bailing pump and support screen pipe 8.
The power oil pipe 1 can drive the bailing pump to move up and down in the shaft and can also drive the piston rod 2 of the bailing pump to move up and down;
the bailing pump comprises a piston rod 2, a pump barrel 3, a sand storage oil pipe 4 and a sand shovel 5 from top to bottom in sequence, wherein the piston rod 2 is connected with a power oil pipe 1, a circulation cavity is arranged in the piston rod 2 and is communicated with a shaft through a one-way valve 6, a piston is arranged at the tail end of the piston rod 2, a piston hole communicated with the circulation cavity and the sand storage oil pipe 4 is arranged on the piston,
the pump barrel 3 is sleeved on the piston rod 2, the piston rod 2 moves up and down along the axial direction of the pump barrel 3,
the sand storage oil pipe 4 is connected with the lower end of the pump barrel 3, the lower end of the sand storage oil pipe 4 is provided with a bottom valve 7, the opening and closing of the bottom valve 7 controls whether reservoir coal blocks and coal dust enter the sand storage oil pipe 4 or not,
the sand shovel 5 is arranged at the lower end of the sand storage oil pipe 4 and used for crushing coal blocks.
The support screen pipe 8 is connected with the sand storage oil pipe 4 through the release 9, the release 9 can realize the connection of the support screen pipe 8 and the sand storage oil pipe 4 with the pump barrel 3, and the throwing of the support screen pipe 8 in a shaft can also be realized.
In order to ensure that the sand shovel 5 can perform its function of crushing the coal, it is preferable that the lower end of the support screen 8 is higher than the sand shovel 5 to ensure that the sand shovel 5 can contact the reservoir.
The specific cleaning process is as follows:
lifting the power oil pipe 1 to drive the piston rod 2 to move upwards to the highest position of the pump barrel 3, closing the check valve 6, opening the bottom valve 7, forming negative pressure in the pump barrel 3 and the sand storage oil pipe 4, sucking coal blocks and coal powder into the sand storage oil pipe 4 at a high speed and layering the coal blocks and the coal powder in the sand storage oil pipe 4 (the upper layer is liquid, and the lower layer is solid such as coal blocks, coal powder and the like), descending a collapsed sand surface in the shaft, and sinking the whole shaft cleaning pipe column for cave completion under the action of gravity to be in contact with the collapsed sand surface in the descending shaft; after pumping, lowering the power oil pipe 1, driving the piston rod 2 to move downwards in the pump barrel 3, opening the one-way valve 6, closing the bottom valve 7, enabling upper-layer liquid in the sand storage oil pipe 4 to enter the circulation cavity through the piston hole and then to be discharged to a shaft through the one-way valve 6; and repeating the steps of lifting the power oil pipe 1 and lowering the power oil pipe 1 until the sand shovel 5 is contacted with the bottom of the artificial well, namely the cleaning of the collapsed sand surface in the shaft of the cave section is finished, at the moment, the support screen pipe 8 is thrown in the shaft through the release 9, and the bailing pump and the release 9 are lifted out of the shaft through the power oil pipe 1.
According to the shaft cleaning pipe column for cave well completion, the whole shaft cleaning pipe column for cave well completion can descend along with descending of a collapsed sand surface in a shaft, namely the supporting screen pipe 8 can descend along with descending of the collapsed sand surface in the shaft in real time, real-time protection of the shaft in the cleaning process is achieved, the problem that the shaft of a coal-bed gas well for cave well completion cannot be cleaned due to serious leakage and serious collapse drilling clamping risk is solved, the supporting screen pipe 8 can be placed in the shaft after shaft cleaning is completed, effective support of the shaft after shaft cleaning is achieved, and later shaft cleaning is facilitated.
In the prior art, after the collapse of the coal-bed gas well with the cave completion, due to the limitation of reservoir geological conditions, the cleaning difficulty of a shaft is very high, and a common coal-bed gas well is scrapped.
The shaft cleaning pipe column for cave well completion is suitable for a vertical well of a coal-bed gas well.
In one embodiment of the present solution, the release 9 is a snap joint having an inner cylinder and an outer cylinder connected to the inner cylinder, wherein the upper end of the inner cylinder is connected to the pump cylinder, the lower end of the inner cylinder is connected to the sand storage oil pipe, and the lower end of the outer cylinder is connected to the upper end of the support screen.
Specifically, the inner cylinder is connected with the pump cylinder through a first thread, the inner cylinder is connected with the sand storage oil pipe through a second thread, the outer cylinder is connected with the support sieve pipe through a third thread, the thread directions of the first thread and the second thread are the same, and the thread directions of the second thread and the third thread are opposite. The back-off 9 is driven by the power oil pipe to rotate, so that the support sieve pipe is separated from the back-off, and the inner cylinder is connected with the pump cylinder 3 and the sand storage oil pipe 4 more tightly in one specific embodiment of the scheme, wherein the back-off 9 is connected with the support sieve pipe 8 through 25-30 threads.
Specifically, the releasing part 9 and the supporting sieve tube 8 can be connected through a shearing pin, and the shearing pin is sheared by providing a shearing force to the supporting sieve tube 8, so that the releasing part 9 and the supporting sieve tube 8 are separated.
In order to ensure the use strength of the releasing gadget 9, the releasing gadget 9 adopts an N80 steel pipe in the scheme.
The diameter of the support screen pipe 8 is 20-60mm smaller than that of the shaft, namely, the clearance between the outer wall of the support screen pipe 8 and the inner wall of the shaft is 10-30mm, and the diameter of the support screen pipe 8 is designed to be as large as possible, so that the cleaned shaft is close to the size before collapse to the maximum extent, and the normal production of the shaft is ensured.
The length and the diameter of bailing pump have been increased in this scheme promptly the size of bailing pump to improve the bailing ability of bailing pump, the bailing ability not only indicates the storage sand ability of bailing pump, but also has the suction capacity of bailing pump. Specifically, the diameter of the pump barrel 3 and the diameter of the sand oil storage pipe 4 are increased, and the length of the pump barrel 3 and the length of the sand oil storage pipe 4 are increased. In the scheme, the diameter of the pump barrel 3 is 110-150mm, the length of the pump barrel is 6-8m, the diameter of the sand oil storage pipe 4 is 80-100mm, and the length of the sand oil storage pipe is greater than the sum of the length of the cave section of the shaft and the length of the pocket.
In the scheme, the length of the support screen pipe 8 is greater than or equal to the sum of the length of the cave section of the shaft and the length of the pocket, so that after the support screen pipe 8 is thrown in the cave well, the support screen pipe 8 can effectively support the cave section and the pocket, and the protection is the most perfect. Preferably, the length of the support screen 8 is greater than 5m the sum of the length of the cavity section of the well bore and the length of the pocket. The length of the sand oil storage pipe 4 is longer than that of the support sieve pipe 8 so as to ensure that the sand shovel 5 can be in contact with a collapsed sand surface in the shaft.
The support screen 8 may be made up of several screens to meet the length requirements of the cavity for the support screen 8.
The support screen 8 may be a slotted screen, a drilled screen, or another type of screen capable of implementing the present solution.
When the supporting screen pipe 8 is a drilling screen pipe, the diameter of the holes is 60-80mm, and the hole density is 10-15/m.
In order to ensure the use strength of the shaft cleaning pipe column, the supporting sieve pipe 8 adopts an N80 steel pipe, and the corresponding sand storage oil pipe 4 also adopts an N80 steel pipe.
In the scheme, the piston rod 2 is a positive prism piston rod. Specifically, the piston rod 2 may be a piston rod 2 with a square cross section, or may be a piston rod 2 with a pentagonal cross section, which is not limited herein.
The piston rod 2 is a regular prism-shaped piston rod 2, and the pump cylinder and the piston rod 2 can rotate together to realize the throwing of the support sieve tube 8.
In order to avoid the coal block from falling on the valve port of the bottom valve 7 and influencing the opening and closing of the bottom valve 7, a supporting plate 10 for collecting the coal block is arranged in the sand storage oil pipe 4. After the pump barrel 3 and the sand storage oil pipe 4 form negative pressure, coal briquettes and coal dust are sucked into the sand storage oil pipe 4 at a high speed, but part of the coal briquettes are large in size and large in corresponding mass, the suspension time in liquid is short, the coal briquettes and coal dust may be pressed on a valve plate of the bottom valve 7, if the valve plate of the bottom valve 7 is pressed by the coal briquettes, the valve plate of the bottom valve 7 cannot be normally opened, the coal briquettes and coal dust on a collapsed sand surface in a shaft cannot be sucked into the sand storage oil pipe 4, and the cleaning of the shaft is affected. This scheme has add layer board 10 in sand storage oil pipe 4, and layer board 10 can be collected the coal cinder to reduce the coal cinder and fall the risk on the valve plate of bottom valve 7, guarantee the normal of bottom valve 7 and open, the cleaning work of pit shaft can work smoothly.
The shaft cleaning pipe column for cave well completion is characterized by further comprising a supporting plate 10 used for collecting coal blocks, wherein the supporting plate 10 is connected with the inner wall of the sand storage oil pipe 4, and the number of the supporting plate 10 is multiple and is uniformly arranged along the inner wall of the sand storage oil pipe 4. Specifically, the support plate 10 is uniformly and linearly arranged along the direction of the sand storage oil pipe 4 parallel to the axis of the sand storage oil pipe 4 to form a support plate group, the support plate group is uniformly arranged along the circumferential direction of the sand storage oil pipe 4, the adjacent support plate groups have a height difference, and the height difference is the height of one support plate 10.
In one embodiment of the present disclosure, the support plate 10 is an arc-shaped support plate or a semi-conical support plate.
The present solution also relates to an improvement of the foot valve 7. The size of the bottom valve 7 is increased by the scheme, particularly the size of the valve port of the bottom valve 7 is increased, so that the valve port of the bottom valve 7 is ensured to allow large-size coal blocks to pass through, and the shaft is effectively cleaned.
The base valve 7 includes a valve seat and a valve plate. In particular, the method comprises the following steps of,
the valve seat is connected with the pipe wall of the sand storage oil pipe 4, a valve port for coal blocks, coal powder and the like to pass through is arranged on the valve seat, and the diameter of the valve port is 20-40mm smaller than that of the sand storage oil pipe 4;
the valve plate is used for shutoff valve port, and the valve plate passes through hinge connection with the disk seat.
The valve plate passes through hinge connection with the disk seat, can guarantee the normal opening and shutting of valve plate, and has reduced the installation degree of difficulty of valve plate.
Because the coal briquette size of the reservoir is large, the coal briquette with large size can not pass through the bottom valve 7, and the cleaning effect on the shaft is influenced. This scheme has still improved sand shovel 5, and sand shovel 5 includes: a fixed cylinder and crushing teeth. Wherein, the solid fixed cylinder is connected and is linked together with sand storage oil pipe 4, smashes the tooth setting on the solid fixed cylinder, realizes the crushing to the coal cinder through smashing the tooth.
The crushing teeth are uniformly arranged along the circumferential direction of the fixed cylinder, the length extending direction of the crushing teeth is parallel to the axis of the fixed cylinder, when coal blocks are crushed, the power oil pipe drives the whole shaft cleaning pipe column for cave well completion to move upwards, then the whole shaft cleaning pipe column for cave well completion descends under the action of gravity, and the coal blocks are crushed through the action of gravity of the shaft cleaning pipe column for cave well completion.
In order to prolong the service life of the sand shovel 5, the grinding teeth are provided with wear-resistant layers. Preferably, the wear-resistant layer is a tungsten alloy wear-resistant layer or a carbide wear-resistant layer.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A wellbore clearing string for cavern completion, comprising:
a power oil pipe (1);
the bailing pump comprises a piston rod (2), a pump barrel (3), a sand storage oil pipe (4) and a sand shovel (5) from top to bottom in sequence, wherein,
the piston rod (2) is connected with the power oil pipe (1), a circulation cavity is arranged in the piston rod (2), the circulation cavity is communicated with a shaft through a one-way valve (6), a piston is arranged at the tail end of the piston rod (2), a piston hole for communicating the circulation cavity with the sand storage oil pipe (4) is arranged on the piston,
the pump cylinder (3) is sleeved on the piston rod (2),
the sand storage oil pipe (4) is connected with the lower end of the pump cylinder (3), the lower end of the sand storage oil pipe (4) is provided with a bottom valve (7),
the sand shovel (5) is arranged at the lower end of the sand storage oil pipe (4); and
and the supporting sieve tube (8), the supporting sieve tube (8) is connected with the sand storage oil pipe (4) through a releasing part (9), and the lower end of the supporting sieve tube (8) is higher than the sand shovel (5).
2. The wellbore clearing string for cavity completion according to claim 1, wherein said release (9) is a snap joint having an inner cylinder and an outer cylinder connected to said inner cylinder, wherein the upper end of said inner cylinder is connected to said pump cylinder (3), the lower end of said inner cylinder is connected to said sand storage tubing (4), and the lower end of said outer cylinder is connected to the upper end of said support screen (8).
3. A wellbore clearing string for cavity completion according to claim 2, wherein said inner barrel is connected to said pump barrel (3) by a first thread, said inner barrel is connected to said sand storage tubing (4) by a second thread, said outer barrel is connected to said support screen (8) by a third thread, said first and second threads having the same thread direction, said second and third threads having the opposite thread direction.
4. A wellbore clearing string for cavity completion according to claim 1, wherein said support screen (8) has a diameter 20-60mm smaller than the diameter of said wellbore.
5. The wellbore cleaning string for cavity completion of claim 1,
the diameter of the pump cylinder (3) is 110-150 mm;
the length of the supporting screen pipe (8) is larger than or equal to the sum of the length of the cavity section of the shaft and the length of the pocket.
6. Wellbore clearing string for cavity completion according to claim 1, characterized in that said piston rod (2) is a right prism piston rod.
7. A shaft cleaning string for cavity completion according to claim 1, further comprising a supporting plate (10) for collecting coal, wherein the supporting plate (10) is connected with the inner wall of the sand storage oil pipe (4), and the number of the supporting plate (10) is multiple and is uniformly arranged along the inner wall of the sand storage oil pipe (4).
8. Wellbore cleaning string for cavity completion according to claim 7, characterized in that the support plate (10) is an arc-shaped support plate or a semi-conical support plate.
9. Wellbore cleaning string for cavity completion according to claim 1, characterized in that the bottom valve (7) comprises:
the valve seat is connected with the pipe wall of the sand storage oil pipe (4), a valve port for coal blocks, coal powder and the like to pass through is arranged on the valve seat, and the diameter of the valve port is 20-40mm smaller than that of the sand storage oil pipe (4);
and the valve plate is used for plugging the valve port and is connected with the valve seat through a hinge.
10. Wellbore cleaning string for cavity completion according to claim 1, characterized in that the sand shovel (5) comprises:
the fixed cylinder is communicated with the sand storage oil pipe (4);
the crushing teeth are arranged on the fixed cylinder and used for crushing coal blocks, and wear-resistant layers are arranged on the crushing teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921476450.2U CN210422533U (en) | 2019-09-05 | 2019-09-05 | Shaft cleaning string for cave completion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921476450.2U CN210422533U (en) | 2019-09-05 | 2019-09-05 | Shaft cleaning string for cave completion |
Publications (1)
| Publication Number | Publication Date |
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| CN210422533U true CN210422533U (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921476450.2U Active CN210422533U (en) | 2019-09-05 | 2019-09-05 | Shaft cleaning string for cave completion |
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| CN (1) | CN210422533U (en) |
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2019
- 2019-09-05 CN CN201921476450.2U patent/CN210422533U/en active Active
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