CN212054657U - Pressure and suction integrated device for branch drilling in coal mine - Google Patents
Pressure and suction integrated device for branch drilling in coal mine Download PDFInfo
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- CN212054657U CN212054657U CN202020752187.1U CN202020752187U CN212054657U CN 212054657 U CN212054657 U CN 212054657U CN 202020752187 U CN202020752187 U CN 202020752187U CN 212054657 U CN212054657 U CN 212054657U
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- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000005553 drilling Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 13
- 238000005336 cracking Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 15
- 238000010276 construction Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 230000035699 permeability Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The utility model discloses a pressing and pumping integrated device for branch drilling in a coal mine well, which comprises a pressing and cracking pipe, wherein a plurality of pressing and cracking sliding sleeves are connected on the pressing and cracking pipe in series, and a pressure difference sliding sleeve is connected on a pipe section of the pressing and cracking pipe close to the bottom of a drilling hole in series; the fracturing pipe is detachably connected with a gas-water separator through a bypass; the fracturing sliding sleeve and the differential pressure sliding sleeve are both composed of a piston and a pipe sleeve, a one-way sliding fit structure only allowing the piston to move in one direction is formed between the piston and the pipe sleeve, and the one-way sliding fit structure is formed by matching a spring piece and one-way teeth; the wall of the pipe sleeve is provided with a through hole penetrating through the pipe wall, the piston can move under the pushing of external force to open the through hole, and the piston of the fracturing sliding sleeve forms a ball seat with the inner hole channel. The beneficial effects of the utility model are that, the device has fracturing and takes out the drainage function concurrently, can effectively improve and take out drainage efficiency, reduces and takes out the drainage cost.
Description
Technical Field
The utility model belongs to the coal bed gas field of developing, concretely relates to colliery is integrative device is taken out with pressing in branch's drilling in pit.
Background
Due to the complexity of geological conditions of coal in Chongqing areas, after main coal measure strata are deposited, strong tectonic movement is carried out, coal body structures are damaged strongly, coal beds of the Chongqing areas are mostly soft coal beds, the Chongqing areas have the characteristics of low coal bed hardness, high gas pressure and content, poor air permeability and the like, and the difficulty in extracting coal bed gas (gas) is high. Through many years of exploration, the hydraulic fracturing permeability increase is one of key technical measures for gas extraction of a low-permeability coal seam, a core technology of water treatment of gas and a working mode of firstly pressing and then pumping are formed, and a certain effect is achieved. However, this method has the following limitations: (1) the conventional fracturing drilling mainly adopts floor roadway cross-layer drilling or the coal seam bedding drilling for fracturing, and the construction amount of the roadway and the drilling is large and the cost is high; (2) each fracturing drill hole is usually fractured at the bottom of the hole only once, so that the number of the fracturing drill holes is large, the hole sealing and fracturing cost is high, the single-hole fracture influence range is small, the gas extraction quantity is small, the drill hole utilization rate is low, the extraction efficiency is low, the standard reaching time is long, and the extraction, extraction and excavation deployment are short; the method for increasing the permeability of large-area regionalized hydraulic fracturing and efficiently extracting gas is urgently needed to be developed.
In recent years, with the development of unconventional oil and gas industry, horizontal well drilling technology and multi-stage staged fracturing technology are rapidly developed, such as the method for permeability increasing and gas extraction of coal mine underground coal seam long drilling staged fracturing published by the Chinese patent document CN 108643877A. Meanwhile, the horizontal well drilling technology is widely applied to long underground coal mine borehole drilling, but in the aspect of staged fracturing technology, due to the limitation of narrow space in the underground coal mine, huge ground fracturing equipment cannot be accommodated, the power of an underground fracturing pump is limited, the construction displacement is far smaller than that of the ground fracturing pump, and the requirement for whole fracturing permeability increase of long boreholes cannot be met, so that the technology for staged fracturing permeability increase of long underground coal mine boreholes and branch boreholes is urgently needed to be researched. The uniform permeability increase of the regional coal seam is realized, the gas extraction effect is improved, and the gas dynamic disaster risk is reduced.
For the staged fracturing device, in the development of oil and gas fields, tools such as open hole packers, soluble fracturing balls and fracturing sliding sleeves with soluble fracturing ball seats are used, but a certain problem exists when part of the tools are used for underground construction of coal mines, and therefore improvement and optimization are needed on the basis.
In addition, at present, research on a long borehole staged fracturing technology of a coal mine underground has been carried out domestically, mainly aiming at a casing pipe under a directional long borehole along a coal seam, and staged packing and multistage fracturing are realized in the casing pipe, but the coal seam in southern areas is generally softer, the difficulty in implementing the long borehole in the coal seam is high, only long boreholes with branches on a top plate or a bottom plate can be implemented (namely, a main borehole of a long borehole is implemented on the top plate or the bottom plate of a target coal seam, and then branches are formed from the main borehole and enter the coal seam), the difficulty in placing the casing pipe in the long boreholes with branches is high, and the formed branch boreholes can be sealed by implementing cement slurry fixed holes in the branch boreholes, so that the fracturing transformation of the coal seam cannot be effectively carried out during fracturing, and therefore, a technical method for staged fracturing of open-hole long boreholes and efficient gas. Meanwhile, the power of the mining fracturing pump is small, most construction discharge capacity is below 1 square/hour, the construction discharge capacity is generally more than several square/minute according to the ground hydraulic fracturing experience of the oil and gas industry, the underground construction discharge capacity of the coal mine is far smaller than the ground fracturing, and the coal seam cannot be subjected to better volume transformation. Therefore, a method for increasing the underground hydraulic fracturing construction discharge capacity of the coal mine needs to be explored, and the construction discharge capacity and the fracturing effect are improved to the maximum extent.
The dissolvable fracturing ball in a staged fracturing device is made of an aluminum magnesium alloy material commonly used in oil and gas field development, the fracturing ball is high in density and free of any problem when being used for underground well drilling, however, most underground coal mine gas treatment holes are upward holes, the power of a fracturing pump for coal mines is far lower than that of a fracturing pump for ground well drilling, the construction discharge capacity is less than 1 cubic meter per minute, the available fracturing ball made of the aluminum magnesium alloy material is difficult to send to a preset position in a fracturing hole, and corresponding improvement is needed.
However, after fracturing of the existing fracturing sliding sleeve and the pressure difference sliding sleeve is completed, the reliability that the sliding sleeve can be stably kept at the original position is poor, along with the pressure relief process, the sliding sleeve can gradually return to form partial plugging or complete plugging of a fracturing hole of the sliding sleeve, and the extraction requirement cannot be met, so that improvement is needed.
Disclosure of Invention
The utility model aims at being exactly to prior art staged fracturing release back, the sliding sleeve has the return hidden danger to lead to gas to take out and take out not enough of difficulty, a colliery is integrative device is taken out with pressing to branch's drilling in the pit, the device passes through spring leaf and one-way tooth cooperation formation one-way sliding fit structure with pressure differential sliding sleeve and fracturing sliding sleeve, with after the fracturing in-process sliding sleeve piston removes the settlement position, keep the position unchangeable by one-way structure, effectively prevent the phenomenon of returning back after the release, ensure to press and take out integrative device and have the function of reliably taking out gas, and then reduce and take out the cost.
In order to achieve the above purpose, the present invention adopts the following technical solution.
A pressure pumping integrated device for branch drilling in a coal mine well comprises a fracturing pipe, wherein a plurality of fracturing sliding sleeves are connected to the fracturing pipe in series, and a pressure difference sliding sleeve is connected to a pipe section, close to the bottom of a drilling hole, of the fracturing pipe in series; the fracturing pipe is detachably connected with a gas-water separator through a bypass; the fracturing sliding sleeve and the differential pressure sliding sleeve are both composed of a piston and a pipe sleeve, a one-way sliding fit structure only allowing the piston to move in one direction is formed between the piston and the pipe sleeve, and the one-way sliding fit structure is formed by matching a spring piece and one-way teeth; the wall of the pipe sleeve is provided with a through hole penetrating through the pipe wall, the piston can move under the pushing of external force to open the through hole, and the piston of the fracturing sliding sleeve forms a ball seat with an inner hole channel.
By adopting the device of the scheme, the plurality of fracturing sliding sleeves are connected in series on the fracturing pipe, and the differential pressure sliding sleeves are connected in series on the pipe section of the fracturing pipe close to the bottom of the drilled hole, so that a structure suitable for a staged fracturing mode of ball-throwing fracturing is formed; meanwhile, the gas-water separator is arranged at the pipe opening of the fracturing pipe, so that the gas-water separator can be connected with a gas extraction system, the purpose that the fracturing pipe is used as a gas extraction pipe is achieved, gas extraction preparation work is reduced, extraction efficiency can be effectively improved, and extraction cost is reduced. The fracturing sliding sleeve structure refers to a fracturing sliding sleeve structure in 'a fracturing sliding sleeve with a dissoluble fracturing ball seat and a fracturing method' announced by CN201410638145, and the pressure difference sliding sleeve and the fracturing sliding sleeve are different in that a piston of the pressure difference sliding sleeve does not form a ball seat structure and is not provided with an internal channel, and the piston slides under the pushing of fracturing fluid at high pressure to open a through hole in the wall of the sliding sleeve. But with prior art's difference point, also be the common characteristics of differential pressure sliding sleeve and fracturing sliding sleeve in this application, be formed with the one-way sliding fit structure that only supplies piston one-way removal between piston and the pipe box promptly to keep open mode after the release, be convenient for take out and adopt coal seam gas.
Preferably, the far end of the pressure difference sliding sleeve on the fracturing pipe is provided with a guide shoe through a hole bottom pipe section. So that the integrated device can be smoothly placed into the drill hole, and the extraction efficiency is improved.
Preferably, the inner hole channels of the ball seat on the fracturing sliding sleeve are sequentially enlarged from the bottom of the drilling hole to the hole opening, and the dissolvable fracturing ball can be used for fracturing by the adjacent fracturing section towards the bottom of the hole; the fracturing sliding sleeve and the differential pressure sliding sleeve are provided with a naked hole packer in the direction of the drilling hole opening, and the naked hole packer is fixedly connected to the fracturing pipe; the bypass is located the end that the fracturing pipe exposes the drilling, and this bypass constitutes the release bypass, is equipped with the pressure relief valve on this release bypass, the exit end of release bypass with gas-water separator is connected. The staged fracturing of the branched long drill holes can be realized, and the gas-water separator is arranged by utilizing the pressure relief bypass, so that the aims of simplifying the structure and reducing the manufacturing and using cost are fulfilled.
Preferably, the open hole packer is a bag type packer, and the inside of the packer is communicated with the inside of the fracturing pipe through a first one-way valve. So that the hole sealing pressure of the hole sealer is increased along with the increase of the fracturing pressure, and the purpose of reliable plugging is achieved.
Preferably, the end part of the fracturing pipe, which is exposed out of the drilling hole, is also provided with a ball throwing bypass with a ball throwing port, and the ball throwing bypass is provided with a valve capable of sealing the ball throwing port. The purpose of convenient ball injection is realized, and reliable sealing can be realized after ball injection.
The beneficial effects of the utility model are that, the device has fracturing and takes out the drainage function concurrently, can effectively improve and take out drainage efficiency, reduces and takes out the drainage cost.
Drawings
Fig. 1 is a schematic structural view of the medium-pressure pumping integrated device of the present invention.
Fig. 2 is a schematic view of a partial structure of the middle sliding sleeve of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the scope of the embodiments described herein.
Referring to fig. 1 and 2, the pressing and pumping integrated device for the branch drilling of the underground coal mine comprises a pressing and cracking pipe 1, wherein a plurality of pressing and cracking sliding sleeves 2 are connected to the pressing and cracking pipe 1 in series, a pressure difference sliding sleeve 3 is connected to a pipe section, close to the bottom of a drilling hole, of the pressing and cracking pipe 1 in series, and a guide shoe 5 is arranged at the far end of the pressure difference sliding sleeve 3 through the pipe section at the bottom of the drilling hole; from the hole bottom of the drilled hole to the orifice, the inner hole channels of the ball seat on the fracturing sliding sleeve 2 are sequentially enlarged, and the dissolvable fracturing balls of each fracturing section can be smoothly delivered in place in the staged fracturing process from the hole bottom to the orifice direction through the dissolvable fracturing balls for fracturing close to the fracturing sections towards the hole bottom direction; the fracturing sliding sleeve 2 and the differential pressure sliding sleeve 3 are provided with a naked hole packer 4 in the direction of the drilling hole opening, and the naked hole packer 4 is fixedly connected to the fracturing pipe 1; a pressure relief bypass 10 is arranged at the end part of the fracturing pipe 1 exposed out of the drill hole, a pressure relief valve 6 is arranged on the pressure relief bypass 10, and an outlet end of the pressure relief bypass 10 is provided with a connector connected with a gas-water separator 7; the pressure relief bypass 10 is detachably connected with a gas-water separator 7 through the interface, and the gas-water separator 7 is provided with a gas outlet 7a and a liquid outlet 7 b; the fracturing sliding sleeve 2 and the differential pressure sliding sleeve 3 are both composed of a piston and a pipe sleeve, a one-way sliding fit structure which only allows the piston to move in one direction is formed between the piston and the pipe sleeve, and the one-way sliding fit structure is formed by matching a spring piece 17 and one-way teeth; the spring piece 17 is fixed on the pipe sleeve 18, the one-way teeth are arranged on the piston 19, the wall of the pipe sleeve is provided with a through hole 20 penetrating through the pipe wall, the piston can move under the pushing of external force to open the through hole, and the piston of the fracturing sliding sleeve 2 forms a ball seat with the inner hole channel, and the ball seat is used for seating the dissoluble fracturing ball 16. When the differential pressure sliding sleeve and the fracturing sliding sleeve are manufactured, the diameter of the through hole in the sleeve wall of the differential pressure sliding sleeve and the fracturing sliding sleeve meets the requirement of the extraction drift diameter, and the aperture of the differential pressure sliding sleeve is larger than that of the sliding sleeve only used for fracturing.
The open hole packer 4 is a bag type packer, and the inside of the packer is communicated with the inside of the fracturing pipe 1 through a first one-way valve 8. The end part of the fracturing pipe 1 exposed out of the drill hole is also provided with a ball throwing bypass 9 with a ball throwing port and a pressure gauge 15, and the ball throwing bypass is provided with a valve 12 capable of sealing the ball throwing port; a second one-way valve 13 is arranged at the pipe orifice of the fracturing pipe 1, and the second one-way valve 13 is used for fracturing and pressure maintaining; the pipe orifice of the fracturing pipe 1 is provided with a pipeline interface 14, and the fracturing pipe 1 is connected with a fracturing pump or a fracturing pump set through the pipeline interface 14 by a high-pressure pipeline.
In the implementation, the number of the fracturing sliding sleeves 2 is three, the pressure difference sliding sleeve 3 is provided with 1 fracturing sliding sleeve which is close to the hole bottom of the long drilled hole, from the hole opening to the hole bottom, inner hole channels of pistons on the three fracturing sliding sleeves 2 are gradually increased, and a dissolvable fracturing ball which is seated on the fracturing sliding sleeve 2 which is close to the pressure difference sliding sleeve 3 can penetrate through the inner hole channels of the other two fracturing sliding sleeves 2 facing to the hole opening direction; the dissolvable fracturing ball seated on the fracturing sliding sleeve 2 at the intermediate position can pass through the internal bore passage of the fracturing sliding sleeve 2 near the orifice.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A pressure pumping integrated device for branch drilling in a coal mine is characterized by comprising a fracturing pipe (1), wherein a plurality of fracturing sliding sleeves (2) are connected to the fracturing pipe (1) in series, and a pressure difference sliding sleeve (3) is connected to a pipe section, close to the bottom of a drilling hole, of the fracturing pipe (1) in series; the fracturing pipe (1) is detachably connected with a gas-water separator (7) through a bypass; the fracturing sliding sleeve (2) and the differential pressure sliding sleeve (3) are both composed of a piston and a pipe sleeve, a one-way sliding fit structure which only allows the piston to move in one direction is formed between the piston and the pipe sleeve, and the one-way sliding fit structure is formed by matching a spring piece and one-way teeth; the wall of the pipe sleeve is provided with a through hole penetrating through the pipe wall, the piston can move under the pushing of external force to open the through hole, and the piston of the fracturing sliding sleeve (2) forms a ball seat with an inner hole channel.
2. The device according to claim 1, characterized in that the fracturing tube (1) is provided with a guide shoe (5) at the far end of the differential pressure sliding sleeve (3) through the bottom hole tube section.
3. The device according to claim 1 or 2, characterized in that the ball seat inner hole passage on the fracturing sliding sleeve (2) is sequentially enlarged from the drilling hole bottom to the hole opening and can be used for dissolving the fracturing ball by the adjacent fracturing section towards the hole bottom; the fracturing sliding sleeve (2) and the pressure difference sliding sleeve (3) are provided with a naked hole packer (4) in the direction of the drilling hole opening, and the naked hole packer (4) is fixedly connected to the fracturing pipe (1); the bypass is located the end that fracturing pipe (1) exposes the drilling, and this bypass constitutes release bypass (10), is equipped with pressure relief valve (6) on this release bypass (10), the exit end of release bypass (10) with deareator (7) are connected.
4. The device according to claim 3, characterized in that the open hole packer (4) is a bag type packer, the inside of which is communicated with the inside of the fracturing pipe (1) through a first one-way valve (8).
5. The device according to claim 3, characterized in that the end of the fracturing pipe (1) exposed out of the borehole is further provided with a ball-throwing bypass with a ball-throwing port, and the ball-throwing bypass is provided with a valve capable of closing the ball-throwing port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020752187.1U CN212054657U (en) | 2020-05-08 | 2020-05-08 | Pressure and suction integrated device for branch drilling in coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020752187.1U CN212054657U (en) | 2020-05-08 | 2020-05-08 | Pressure and suction integrated device for branch drilling in coal mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212054657U true CN212054657U (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020752187.1U Expired - Fee Related CN212054657U (en) | 2020-05-08 | 2020-05-08 | Pressure and suction integrated device for branch drilling in coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212054657U (en) |
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2020
- 2020-05-08 CN CN202020752187.1U patent/CN212054657U/en not_active Expired - Fee Related
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Granted publication date: 20201201 |