CN219220388U - Top plate and coal seam combined hydraulic fracturing synergistic permeability-increasing device - Google Patents
Top plate and coal seam combined hydraulic fracturing synergistic permeability-increasing device Download PDFInfo
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- CN219220388U CN219220388U CN202320222905.8U CN202320222905U CN219220388U CN 219220388 U CN219220388 U CN 219220388U CN 202320222905 U CN202320222905 U CN 202320222905U CN 219220388 U CN219220388 U CN 219220388U
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Abstract
The utility model discloses a roof and coal seam combined hydraulic fracturing synergistic permeability-increasing device, which comprises a water storage tank, a hydraulic pump and a fracturing device, wherein the water storage tank is connected with the inlet end of the hydraulic pump through a water outlet pipeline, and the outlet end of the hydraulic pump is connected with the fracturing device through a high-pressure water pipe; the fracturing device comprises a hydraulic fracturing drill rod, hydraulic fracturing drilling holes are constructed under a mine, the hydraulic fracturing drilling holes sequentially penetrate through a bottom plate rock stratum and a coal seam until a roof rock stratum, the hydraulic fracturing drill rod is inserted into the hydraulic fracturing drilling holes, and one end of the hydraulic fracturing drill rod is connected with a high-pressure water pipe through a connecting device. According to the utility model, the three-soft low-permeability high-gas soft coal seam roof is subjected to water injection fracturing by the high-pressure fracturing water, so that gas extraction is facilitated, the device is simple in structure and easy to operate, and the gas extraction efficiency and the mine safety production coefficient are improved.
Description
Technical Field
The utility model relates to the field of gas extraction under mines, in particular to a roof and coal seam combined hydraulic fracturing synergistic permeability-increasing device.
Background
At present, most of coal seams mined by high-gas and protruding mines in China belong to low-permeability coal seams, have poor air permeability, difficult gas extraction and low efficiency, and are particularly prominent in coal mines which contain three soft coal seams, namely, have complex geological structures, poor occurrence conditions, soft coal seams and soft top and bottom plates, and severely restrict the safe production of the mines. As a pressure relief and permeability improvement measure for low-permeability coal seams, hydraulic fracturing has the advantages of simple process, wide influence range, low risk and the like, and is widely applied in recent years.
Aiming at how to perform high-efficiency anti-reflection extraction on a three-soft low-permeability coal seam, the method has become a critical technical problem, and meanwhile, a plurality of defects exist for the fracturing technology related to the soft coal-based stratum with difficult seam formation. How to produce a complex three-dimensional seam net structure in a coal-rock complex body with soft and difficult seam formation and a relatively stable overlying rock top plate, improve the pressure relief and permeability improvement effects of a coal seam in a fracturing area, realize long-term efficient extraction of coal seam gas in the fracturing area, and be the development trend of the application of a hydraulic fracturing technology in coal reservoirs.
Disclosure of Invention
The utility model aims to provide a roof and coal seam combined hydraulic fracturing synergistic permeability-increasing device, which is used for solving the problems that the existing underground low-permeability and high-gas three-soft coal seam is difficult to produce a complex three-dimensional seam net structure, and the gas extraction is difficult and the efficiency is low.
The technical scheme adopted by the utility model is as follows:
the roof and coal seam combined hydraulic fracturing synergistic permeability-increasing device comprises a water storage tank, a hydraulic pump and a fracturing device, wherein the water storage tank is connected with the inlet end of the hydraulic pump through a water outlet pipeline, and the outlet end of the hydraulic pump is connected with the fracturing device through a high-pressure water pipe;
the fracturing device comprises a hydraulic fracturing drill rod, hydraulic fracturing drilling holes are constructed under a mine, the hydraulic fracturing drilling holes sequentially penetrate through a bottom plate rock stratum and a coal seam until a roof rock stratum, the hydraulic fracturing drill rod is inserted into the hydraulic fracturing drilling holes, and one end of the hydraulic fracturing drill rod is connected with a high-pressure water pipe through a connecting device.
Preferably, a first plugging device is arranged on the hydraulic fracturing drill hole and corresponds to the junction of the roof stratum and the coal seam, and a second plugging device is arranged on the hydraulic fracturing drill hole and corresponds to the junction of the coal seam and the floor stratum.
Preferably, radial slots are provided at the roof strata and coal seam in communication with the hydraulic fracturing bore.
Preferably, the radial slits are provided at positions where the radial slits are provided, and the radial slits are provided in at least four directions, i.e., front, rear, left and right.
Preferably, a plurality of hydraulic fracturing drillings are arranged in parallel.
Preferably, a pressure gauge and a switch valve are arranged on the high-pressure water pipe.
Preferably, a drilling hole sealing device is arranged on the bottom plate rock stratum and corresponds to the hydraulic fracturing drilling hole, and the outlet end of the high-pressure water pipe is connected with the tail part of the hydraulic fracturing drill rod at the drilling hole sealing device.
Preferably, the water storage tank is connected with a mine tunnel water source pipeline, and the water storage tank and the water pressure pump are both arranged in the mine tunnel.
Preferably, a drainage pipeline is further arranged in the mine tunnel and connected with the high-pressure water pipe through a connecting device.
Preferably, the bottoms of the water storage tank and the hydraulic pump are respectively provided with a movable roller.
The beneficial technical effects of the utility model are as follows:
according to the utility model, the three-soft low-permeability high-gas soft coal seam roof is subjected to water injection fracturing by the high-pressure fracturing water, so that gas extraction is facilitated, the device is simple in structure and easy to operate, and the gas extraction efficiency and the mine safety production coefficient are improved.
According to the hydraulic fracturing device, radial slots are formed in the circumferences of the corresponding positions of the hydraulic fracturing drill holes, so that the hydraulic fracturing device can play a role in guiding fracturing of later-stage high-pressure water, and the high-pressure water is expanded along the radial slots to form a fracture network; and then the roof strata and the coal seam are subjected to fracturing successively through the cooperative control of the first plugging device and the second plugging device, so that a mutually communicated fracture network structure is formed between the roof strata and the coal seam, the water injection fracturing effect is good, and the roof and the coal seam can realize cooperative permeability increase and gas extraction.
The utility model is especially suitable for the three-soft coal seam permeability improvement of low air permeability and high gas under a mine, and by combining the roof-coal seam drilling pre-slotting technology with hydraulic fracturing, a complex three-dimensional seam net structure is generated in a coal-rock composite body which is soft, difficult to form seams and relatively stable in overlying rock roof, so that the pressure relief and permeability improvement effects of the coal seam in a fracturing area are improved, and the long-term efficient extraction of the gas of the coal seam in the fracturing area is realized. The utility model can effectively solve the problems of difficult gas extraction and low efficiency caused by the difficulty in producing complex three-dimensional seam net structures in the existing mine low-permeability and high-gas three-soft coal seam.
Drawings
The utility model is further described with reference to the drawings and detailed description which follow:
FIG. 1 is a schematic diagram of the structural principle of one embodiment of the roof and coal seam combined hydraulic fracturing synergistic permeability increasing device of the present utility model;
FIG. 2 is a schematic view of a plurality of hydraulic fracturing drillings of the present utility model arranged in parallel on a floor strata, a coal seam and a roof strata;
FIG. 3 is a schematic illustration of radial slot crack propagation in accordance with the present utility model.
In the figure: 1. a roof formation; 2. a coal seam; 3. a floor strata; 4. hydraulic fracturing; 5. radial slotting; 6. a first occlusion device; 7. a hole drilling and sealing device; 8. hydraulically fracturing a drill pipe; 9. a connecting device; 10. a high pressure water pipe; 11. a pressure gauge; 12. a switch valve; 13. a water pressure pump; 14. a water outlet pipeline; 15. a water storage tank; 16. a mine tunnel water source pipeline; 17. mine roadways; 18. a second occluding device.
Detailed Description
As shown in fig. 1, the roof and coal seam combined hydraulic fracturing collaborative permeability-increasing device comprises a water storage tank 15, a hydraulic pump 13 and a fracturing device, wherein the water storage tank 15 is connected with the inlet end of the hydraulic pump 13 through a water outlet pipeline 14, and the outlet end of the hydraulic pump 13 is connected with the fracturing device through a high-pressure water pipe 10. The fracturing device comprises a hydraulic fracturing drill rod 8, hydraulic fracturing drill holes are constructed under a mine, sequentially penetrate through a bottom plate rock layer 3 and a coal bed 2 until a roof rock layer 1, penetrate through the coal bed 2 and penetrate into the region, which is attached to the coal bed 2, of the roof rock layer 1. The hydraulic fracturing drill rod 8 is inserted into a hydraulic fracturing drill hole, and the tail end of the hydraulic fracturing drill rod is placed at different positions of the hydraulic fracturing drill hole, such as the position corresponding to the roof stratum 1 or the position corresponding to the coal seam 2 according to hydraulic fracturing requirements during construction. The other end of the hydraulic fracturing drill rod 8 is connected with a high-pressure water pipe 10 through a connecting device 9, and the whole hydraulic fracturing device forms a passage.
As a further design of the utility model, a first plugging device 6 is arranged on the hydraulic fracturing drill hole and corresponds to the junction of the roof strata 1 and the coal seam 2, and a second plugging device 18 is arranged on the hydraulic fracturing drill hole and corresponds to the junction of the coal seam 2 and the floor strata 3. The first plugging device 6 and the second plugging device 18 can adopt the conventional structure, and the main purpose of the plugging device is to plug different sections of hydraulic fracturing drilling holes, so that high-pressure water is injected by matching with a hydraulic fracturing drill rod, and the roof strata 1 and the coal seam 2 are respectively fractured.
Further, radial slots 5 are provided at the roof strata 1 and coal seam 2 in communication with the hydraulic fracturing bore holes. The high pressure water ejected by the hydraulic fracturing drill pipe 8 propagates along the radial slot positions of the rock formation to form a fracture network. Radial slits 5 serve as guides for the formation of a network of cracks.
The radial slits 5 are provided when the hydraulic fracturing drill holes are opened, and can be formed by means of hydraulic slits and the like. If each position point provided with radial slits at least comprises radial slits in front, back, left and right directions, the hydraulic pressure slits are expanded along the 4 directions, and the expansion schematic diagram of the radial slits is shown in fig. 3. Of course, radial slots can be arranged along more directions of the circumference of the hydraulic fracturing drilling hole.
Further, a plurality of hydraulic fracturing drilling holes are arranged in parallel, and a layout diagram of the plurality of hydraulic fracturing drilling holes is shown in fig. 2. High-pressure water is injected into a plurality of hydraulic fracturing drilling holes through the hydraulic fracturing drill rod 8 in sequence, so that the roof strata 1 and the coal bed 2 form a three-dimensional complex hydraulic fracture network, and pressure relief and permeability improvement of the roof strata and the coal bed are realized.
The aperture and depth of the hydraulic fracturing drilling holes, the spacing among the hydraulic fracturing drilling holes, the hydraulic pressure parameters at the outlet of the hydraulic pump and the like can be set according to different actual conditions of the mine.
Further, a pressure gauge 11 and an on-off valve 12 are provided on the high-pressure water pipe 10. The pressure gauge 11 and the switch valve 12 are arranged at the outlet end of the water pump 13, so that the real-time monitoring of the water pressure in the water pump 13, and the switching and flow control of the high-pressure water pipe can be realized.
Further, a drilling hole sealing device 7 is arranged on the bottom plate rock stratum 3 and corresponds to the hydraulic fracturing drilling hole, and the hydraulic fracturing drilling hole can be plugged through the drilling hole sealing device 7. The outlet end of the high-pressure water pipe 10 is connected with the tail part of the hydraulic fracturing drill rod 8 at the position of the drilling hole sealing device 7.
Further, the water storage tank 15 is connected with a mine tunnel water source pipeline 16, and the water storage tank 15 and the water pump 13 are both arranged in a mine tunnel 17. A drainage pipeline is also arranged in the mine tunnel 17 and is connected with the high-pressure water pipe 10 through a connecting device 9. After the high-pressure water injection fracturing is completed, the high-pressure water pipe 10 can be connected with a drainage pipeline through the connecting device 9 to conduct gas drainage. The utility model is suitable for the three-soft low-permeability high-gas coal seam.
Further, a movable roller 19 is provided at the bottom of both the water storage tank 15 and the hydraulic pump 13. Through the arrangement of the movable roller 19, the water storage tank 15, the hydraulic pump 13 and the like can conveniently move in the mine tunnel 17, and the convenience of hydraulic fracturing is further improved.
The implementation method of the roof and coal seam combined hydraulic fracturing synergistic permeability-increasing device comprises the following steps:
(1) Perforating the hole
And selecting the positions of the hydraulic fracturing drilling holes, and arranging a plurality of hydraulic fracturing drilling holes which are parallel to each other. The hydraulic fracturing drilling holes sequentially penetrate through the bottom plate rock stratum 3 and the coal bed 2 to the top plate rock stratum 1, and radial slots 5 are formed in the circumferences of the corresponding positions of the hydraulic fracturing drilling holes, corresponding to the coal bed and the top plate rock stratum.
(2) Filling drill rod
After the hydraulic fracturing drilling construction is completed, the hydraulic fracturing drill rod 8 is filled into the hydraulic fracturing drilling hole, and the tail end of the hydraulic fracturing drilling hole is sealed through the drilling hole sealing device 7.
(3) Staged fracturing
The water is injected into the water storage tank 15 through the mine tunnel water source pipeline 16, the water pump 13 is started, and the water in the water storage tank 15 is pressurized by the water pump 13 and then is sequentially conveyed into the hydraulic fracturing drilling hole through the high-pressure water pipe 10 and the hydraulic fracturing drill pipe 8. The hydraulic fracturing drilling sections corresponding to the roof strata are plugged through the first plugging device 6, high-pressure water is input through the hydraulic fracturing drill rod to fracture the roof strata 1, and at the moment, the tail end of the hydraulic fracturing drill rod stretches into the roof strata. The high pressure water propagates along the radial slot locations in multiple directions of the roof strata to form hydraulic fractures 4, which in turn form a fracture network. And then the hydraulic fracturing drilling sections corresponding to the coal bed 2 are plugged through the first plugging device 6 and the second plugging device 18, high-pressure water is input through the hydraulic fracturing drill rod to fracture the coal bed, and at the moment, the tail end of the hydraulic fracturing drill rod moves to the coal bed 2. The high-pressure water is expanded along radial slotting positions of the coal seam in multiple directions to form a water pressure crack, so that a crack network is formed, and a crack network structure which is communicated with each other is formed between the roof strata 1 and the coal seam 2. And then high-pressure water is injected into the hydraulic fracturing drill holes sequentially, so that the roof strata 1 and the coal bed 2 form a three-dimensional complex hydraulic fracture network, and pressure relief and permeability improvement of the roof strata 1 and the coal bed 2 are realized.
(4) Collaborative extraction
And disconnecting the connecting device 9 between the hydraulic pump 13 and the hydraulic fracturing drill rod 8, connecting a drainage pipeline in the mine tunnel with the hydraulic fracturing drill rod 8 through the connecting device 9, and carrying out collaborative drainage of the roof and the coal seam gas.
The parts not described in the above modes can be realized by adopting or referring to the prior art.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.
Claims (8)
1. The utility model provides a roof and coal seam combine hydraulic fracturing to cooperate anti-reflection device which characterized in that: the device comprises a water storage tank, a water pressure pump and a fracturing device, wherein the water storage tank is connected with the inlet end of the water pressure pump through a water outlet pipeline, and the outlet end of the water pressure pump is connected with the fracturing device through a high-pressure water pipe;
the fracturing device comprises a hydraulic fracturing drill rod, hydraulic fracturing drilling holes are constructed under a mine, the hydraulic fracturing drilling holes sequentially penetrate through a bottom plate rock stratum and a coal seam to a roof rock stratum, the hydraulic fracturing drill rod is inserted into the hydraulic fracturing drilling holes, and one end of the hydraulic fracturing drill rod is connected with a high-pressure water pipe through a connecting device;
a first plugging device is arranged on the hydraulic fracturing drilling hole and corresponds to the joint of the roof stratum and the coal seam, and a second plugging device is arranged on the hydraulic fracturing drilling hole and corresponds to the joint of the coal seam and the floor stratum;
radial slots are provided at the roof strata and the coal seam in communication with the hydraulic fracturing bore.
2. A roof and coal seam combination hydraulic fracturing co-reflection enhancing apparatus as claimed in claim 1, wherein: the radial slots at the positions of the radial slots at least comprise front, back, left and right radial slots.
3. A roof and coal seam combination hydraulic fracturing co-reflection enhancing apparatus as claimed in claim 1, wherein: the hydraulic fracturing drill holes are arranged in parallel.
4. A roof and coal seam combination hydraulic fracturing co-reflection enhancing apparatus as claimed in claim 1, wherein: the high-pressure water pipe is provided with a pressure gauge and a switch valve.
5. A roof and coal seam combination hydraulic fracturing co-reflection enhancing apparatus as claimed in claim 1, wherein: and a drilling hole sealing device is arranged on the bottom plate rock stratum and corresponds to the hydraulic fracturing drilling hole, and the outlet end of the high-pressure water pipe is connected with the tail part of the hydraulic fracturing drill rod at the drilling hole sealing device.
6. A roof and coal seam combination hydraulic fracturing co-reflection enhancing apparatus as claimed in claim 1, wherein: the water storage tank is connected with a mine tunnel water source pipeline, and the water storage tank and the hydraulic pump are both arranged in the mine tunnel.
7. The roof and coal seam combination hydraulic fracturing co-reflection reducing apparatus of claim 6, wherein: and a drainage pipeline is also arranged in the mine tunnel and is connected with the high-pressure water pipe through a connecting device.
8. A roof and coal seam combination hydraulic fracturing co-reflection enhancing apparatus as claimed in claim 1, wherein: the bottoms of the water storage tank and the hydraulic pump are respectively provided with a movable roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320222905.8U CN219220388U (en) | 2023-01-31 | 2023-01-31 | Top plate and coal seam combined hydraulic fracturing synergistic permeability-increasing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320222905.8U CN219220388U (en) | 2023-01-31 | 2023-01-31 | Top plate and coal seam combined hydraulic fracturing synergistic permeability-increasing device |
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| CN219220388U true CN219220388U (en) | 2023-06-20 |
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| CN202320222905.8U Active CN219220388U (en) | 2023-01-31 | 2023-01-31 | Top plate and coal seam combined hydraulic fracturing synergistic permeability-increasing device |
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