CN220815608U - Coal seam hydraulic fracturing device - Google Patents
Coal seam hydraulic fracturing device Download PDFInfo
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- CN220815608U CN220815608U CN202322788226.XU CN202322788226U CN220815608U CN 220815608 U CN220815608 U CN 220815608U CN 202322788226 U CN202322788226 U CN 202322788226U CN 220815608 U CN220815608 U CN 220815608U
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- hydraulic fracturing
- fracturing
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- 239000003245 coal Substances 0.000 title claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000000605 extraction Methods 0.000 abstract description 9
- 238000005065 mining Methods 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 230000035699 permeability Effects 0.000 description 7
- 238000005553 drilling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
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Abstract
The utility model discloses a coal seam hydraulic fracturing device, which relates to the technical field of prevention and control of underground gas of coal mines, and comprises a fracturing pump, wherein the water inlet end of the fracturing pump is connected with a water source, the water outlet end of the fracturing pump is connected with two high-pressure pipelines in parallel through a three-way valve, and each high-pressure pipeline is provided with a pressure gauge and a flowmeter; the water outlet of each high-pressure pipeline is connected with a hydraulic fracturing drill rod, one hydraulic fracturing drill rod is inserted into a hydraulic fracturing drill hole formed in the roof layer, the other hydraulic fracturing drill rod is inserted into a hydraulic fracturing drill hole formed in the coal seam, and a drill hole sealing bag is arranged between the hydraulic fracturing drill rod and the corresponding hydraulic fracturing drill hole. Two high-pressure pipelines are connected in parallel through a three-way valve, so that a fracturing scheme is formulated according to the site situation, namely, independent fracturing or simultaneous fracturing of the roof and the coal seam can be realized; and the opening and closing degree of the three-way valve is regulated, the fracturing pressure is regulated, and the gas extraction efficiency and the coal seam mining safety are improved.
Description
Technical Field
The utility model relates to the technical field of prevention and control of underground coal mine gas, in particular to a hydraulic fracturing device for a coal seam.
Background
The coal seam of the mine in China is generally accompanied with the characteristics of high ground stress and low air permeability, and the problem that gas extraction of the low air permeability coal seam is always a key link for ensuring safe production of the coal mine and improving the production efficiency of the coal mine is solved. And (3) carrying out pressure relief and permeability increase by utilizing hydraulic fracturing permeability increase measures, and implementing gas extraction. The hydraulic fracturing is to make use of high-pressure water to enter a coal body, the high-pressure water overcomes the friction resistance of a drilling hole wall by means of the supporting effect of the weak surface of the coal wall in the pore cracks of the coal body, the pressing speed is higher than the filtering stall degree of water, the internal water pressure of the high-pressure water is increased, after the tensile strength of the coal wall is achieved, stress concentration is formed at the tip of the cracks, the cracks are opened and enter the weak surface of the next stage, more artificial cracks are generated, the cracks are communicated with each other and form a crack network, the air permeability of the coal body is increased, the desorption effect of the coal body for absorbing gas is increased, the gas extraction effect is improved, and the gas content and the gas pressure are reduced.
The existing partial mine coal seam roof is hard in texture and has high stress and low air permeability similar to the coal seam, so that the roof needs to be cracked, and the fracturing of the roof and the coal seam needs to be flexibly arranged due to inconsistent depth or density, so that the fracturing pressure or the fracturing site situation is required to be flexibly arranged, otherwise, roof collapse can occur due to rock burst, the working efficiency is affected, and the safety is reduced.
Disclosure of utility model
The utility model aims to provide a hydraulic fracturing device for a coal seam, which can selectively carry out hydraulic fracturing on a roof or the coal seam singly or simultaneously by adopting double drilling holes of the roof and the coal seam and by means of a split electromagnetic valve, so that the hydraulic fracturing effect on the coal seam is accurately controlled, the air permeability of the coal seam is improved, the stress of the coal seam is reduced, and the underground working efficiency and safety are improved.
In order to achieve the above object, the technical scheme of the present utility model is as follows:
The hydraulic fracturing device for the coal seam comprises a fracturing pump, wherein the water inlet end of the fracturing pump is connected with a water source, the water outlet end of the fracturing pump is connected with two high-pressure pipelines in parallel through a three-way valve, and each high-pressure pipeline is provided with a pressure gauge and a flowmeter; the hydraulic fracturing drill pipes are connected to the water outlet of each high-pressure pipeline, one hydraulic fracturing drill pipe is inserted into a hydraulic fracturing drill hole formed in the roof layer, the other hydraulic fracturing drill pipe is inserted into a hydraulic fracturing drill hole formed in the coal seam, and a drill hole sealing bag is arranged between the hydraulic fracturing drill pipe and the corresponding hydraulic fracturing drill hole.
And each high-pressure pipeline is also provided with a one-way stop valve.
Wherein, two hydraulic fracturing drilling rods parallel arrangement.
The water inlet end of the fracturing pump is connected with a water tank, and the water tank is connected with a water pipe of a roadway.
Wherein, the three-way valve is a three-position three-way electromagnetic valve.
Wherein, the three-way valve is a four-position three-way electromagnetic valve.
Wherein, be connected with the multi-control switch on the three-way valve.
After the technical scheme is adopted, the utility model has the beneficial effects that:
The utility model relates to a coal seam hydraulic fracturing device which comprises a fracturing pump, wherein the water inlet end of the fracturing pump is connected with a water source, the water outlet end of the fracturing pump is connected with two high-pressure pipelines in parallel through a three-way valve, and each high-pressure pipeline is provided with a pressure gauge and a flowmeter; the hydraulic fracturing drill pipes are connected to the water outlet of each high-pressure pipeline, one hydraulic fracturing drill pipe is inserted into a hydraulic fracturing drill hole formed in the roof layer, the other hydraulic fracturing drill pipe is inserted into a hydraulic fracturing drill hole formed in the coal seam, and a drill hole sealing bag is arranged between the hydraulic fracturing drill pipe and the corresponding hydraulic fracturing drill hole. Two high-pressure pipelines are connected in parallel through the three-way valve, and a pressure gauge and a flow meter are arranged on each high-pressure pipeline, so that a fracturing scheme is formulated according to the site conditions, namely, independent fracturing of a roof/coal seam or simultaneous fracturing of the roof/coal seam can be realized, and when the fracturing is performed, the opening and closing degree of the three-way valve can be adjusted according to the measured values of the pressure gauge and the flow meter, the fracturing pressure can be adjusted, the operation is convenient, flexible arrangement of hydraulic fracturing is realized, and the gas extraction efficiency and the coal seam mining safety are improved.
And a one-way stop valve is further arranged on each high-pressure pipeline, so that backflow of the fracturing water is prevented.
Through two hydraulic fracturing drilling rods parallel arrangement to convenient operation can guarantee the biggest fracturing net coverage simultaneously.
The water inlet end of the fracturing pump is connected with a water tank, and the water inlet end of the water tank is connected with a water pipe of a roadway, so that the device can be reasonably arranged.
The three-way valve is a three-position three-way electromagnetic valve, so that separate fracturing or simultaneous fracturing of the roof and the coal seam can be realized.
The three-way valve is a four-position three-way electromagnetic valve, so that a normally closed position is added, and the stability of equipment is improved.
The hydraulic fracturing device for the coal seam solves the technical problems that in the prior art, a fracturing roof and the coal seam of the hydraulic fracturing device for the coal seam cannot be flexibly arranged according to actual conditions, so that the extraction efficiency of the coal seam is low and the safety of coal seam exploitation is low.
Drawings
FIG. 1 is a schematic diagram of a hydraulic fracturing device for coal seams in accordance with the present utility model;
Fig. 2 is a schematic diagram of a four-position three-way solenoid valve in the third embodiment.
In the figure, 1, a fracturing pump, 11, a power system, 2, a water tank, 5, a high-pressure pipeline, 51, a pressure gauge, 52, a flowmeter, 53, a one-way stop valve, 6, a hydraulic fracturing drill rod, 61, a drilling hole sealing bag, 7, a three-way valve, 70, a valve body, 71, a water inlet, 721, a first water outlet, 722, a second water outlet, 73, an electromagnetic valve rod, 74, a piston, 8 and a multi-control switch.
Detailed Description
The utility model is further elucidated below in conjunction with the accompanying drawings.
The orientations referred to in the specification are all based on the orientations of the coal seam hydraulic fracturing device in normal operation, are not limited to the orientations in storage and transportation, and only represent relative positional relationships and not absolute positional relationships.
Embodiment one:
As shown in fig. 1, the coal seam hydraulic fracturing device is installed in a roadway and comprises a fracturing pump 1, and a power system 11 is arranged on one side of the fracturing pump 1. The water inlet end of the fracturing pump 1 is connected with a water source, and can be directly connected with an external water source, and in the embodiment, the water inlet end of the fracturing pump 1 is conveniently and directly connected with a water pipe of a roadway, and in order to ensure the working water pressure of the fracturing pump 1, a water tank 2 is arranged on the water pipe of the roadway, the water inlet end of the fracturing pump 1 is connected with the water tank 2, and the water tank 2 provides water storage for the fracturing pump 1.
The water outlet end of the fracturing pump 1 is connected with two high-pressure pipelines 5 in parallel through a three-way valve 7, and a pressure gauge 51, a flowmeter 52 and a one-way stop valve 53 are arranged at the water inlet of each high-pressure pipeline 5. When high-pressure water flow enters the high-pressure pipeline 5 of a preset scheme from the fracturing pump 1, the water pressure and the flow can be accurately controlled through the readings of the pressure gauge 51 and the flow meter 52, and then the hydraulic fracturing effect is controlled.
The three-way valve 7 can be a solenoid valve or other valves respectively arranged on each branch of a common three-way valve, and the fracturing effect of fracturing water entering the corresponding high-pressure pipeline 5 is controlled by controlling the opening and closing of each solenoid valve.
The water outlet of each high-pressure pipeline 5 is connected with a hydraulic fracturing drill rod 6, and the outer side of the hydraulic fracturing drill rod 6 is sleeved with a hydraulic fracturing drill rod jacket. One of the hydraulic fracturing drill rods 6 is inserted into a hydraulic fracturing drill hole formed in the roof layer A, the other hydraulic fracturing drill rod 6 is inserted into a hydraulic fracturing drill hole formed in the coal seam B, a drill hole sealing bag 61 is arranged between the hydraulic fracturing drill rod 6 and the corresponding hydraulic fracturing drill hole, and the hydraulic fracturing drill hole is sealed through the drill hole sealing bag 61.
Further, two hydraulic fracturing stems 6 are arranged in parallel.
The three-way valve 7 is connected with a multi-control switch 8, and the multi-control switch 8 is pulled to different contacts to select the path of the three-way valve 7 allowing water to pass through.
As shown in fig. 1, a working process of the hydraulic fracturing device for the coal seam comprises the following steps:
The hydraulic fracturing device of the coal seam is arranged in a mine tunnel, a water inlet of a water tank 2 is connected with a water pipe of the mine tunnel, and the tail end of a high-pressure pipeline 5 is arranged in a hydraulic fracturing drill hole and connected with a hydraulic fracturing drill rod 6; determining a hydraulic fracturing scheme according to the conditions of the roof layer A and the coal seam B, and controlling the opening condition of the corresponding three-way valve 7; then sequentially starting a power system 11, a fracturing pump 1 and a mine tunnel water pipe switch, pressurizing water flow through the fracturing pump 1, and realizing hydraulic fracturing on coal strata around a hydraulic fracturing borehole after the water flow enters a high-pressure pipeline 5; after the fracturing process is finished, the mine tunnel water pipe switch, the fracturing pump 1 and the power system 11 are sequentially closed, the hydraulic fracturing system is closed, and then the tunnel gas extraction pipeline is switched to carry out gas extraction.
Embodiment two:
As shown in fig. 2, this embodiment is basically the same as the first embodiment, except that the three-way valve 7 is a three-position three-way solenoid valve.
The three-position three-way electromagnetic valve comprises a valve body 70, and a water inlet 71, a first water outlet 721 and a second water outlet 722 which are arranged on the valve body 70. The valve body 70 is provided with a solenoid valve stem 73 and a piston 74 fixed to the solenoid valve stem 73, and the solenoid valve stem 73 is controlled to move left and right by electromagnetic energization, so that the piston 74 is controlled to switch among the water inlet 71, the first water outlet 721, and the second water outlet 722. The water outlet end of the fracturing pump 1 is connected with the water inlet 71, and the two high-pressure pipelines 5 are respectively connected to the first water outlet 721 and the second water outlet 722.
The three-position three-way electromagnetic valve is provided with three positions, namely when the piston 74 blocks the position of the first water outlet 721, the water inlet 71 is opened, the second water outlet 722 is opened, and the corresponding hydraulic fracturing drill rod 6 on the high-pressure pipeline 5 works; when the piston 74 blocks the second water outlet 722, the water inlet 71 is opened, the first water outlet 721 is opened, and the corresponding hydraulic fracturing drill rod 6 on the high-pressure pipeline 5 works; when the piston 74 is in the rim position (position in the figure), the water inlet 71 is open, both the first water outlet 721 and the second water outlet 722 are open, and both hydraulic fracturing stems 6 are working.
Embodiment III:
The present embodiment is basically identical to the second embodiment, except that the three-way valve 7 is a four-position three-way solenoid valve. I.e. on the basis of embodiment two, the normally closed position is increased, i.e. when the piston 74 blocks the water inlet 71, the water inlet 71 is closed and the fracturing pump 1 is not operated.
The hydraulic fracturing device for the coal seam solves the technical problems that in the prior art, a fracturing roof and the coal seam of the hydraulic fracturing device for the coal seam cannot be flexibly arranged according to actual conditions, so that the extraction efficiency of the coal seam is low and the safety of coal seam exploitation is low.
It should be understood that the above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, and that the utility model is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the utility model.
Claims (7)
1. The utility model provides a coal seam hydraulic fracturing device which characterized in that: the fracturing device comprises a fracturing pump, wherein the water inlet end of the fracturing pump is connected with a water source, the water outlet end of the fracturing pump is connected with two high-pressure pipelines in parallel through a three-way valve, and each high-pressure pipeline is provided with a pressure gauge and a flowmeter; the hydraulic fracturing drill pipes are connected to the water outlet of each high-pressure pipeline, one hydraulic fracturing drill pipe is inserted into a hydraulic fracturing drill hole formed in the roof layer, the other hydraulic fracturing drill pipe is inserted into a hydraulic fracturing drill hole formed in the coal seam, and a drill hole sealing bag is arranged between the hydraulic fracturing drill pipe and the corresponding hydraulic fracturing drill hole.
2. A coal seam hydraulic fracturing apparatus according to claim 1, wherein: and each high-pressure pipeline is also provided with a one-way stop valve.
3. A coal seam hydraulic fracturing apparatus according to claim 1, wherein: the two hydraulic fracturing drill rods are arranged in parallel.
4. A coal seam hydraulic fracturing apparatus according to claim 1, wherein: the water inlet end of the fracturing pump is connected with a water tank, and the water tank is connected with a water pipe of a roadway.
5. A coal seam hydraulic fracturing apparatus according to claim 1, wherein: the three-way valve is a three-position three-way electromagnetic valve.
6. A coal seam hydraulic fracturing apparatus according to claim 1, wherein: the three-way valve is a four-position three-way electromagnetic valve.
7. A coal seam hydraulic fracturing apparatus according to claim 1, wherein: and the three-way valve is connected with a multi-control switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322788226.XU CN220815608U (en) | 2023-10-17 | 2023-10-17 | Coal seam hydraulic fracturing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322788226.XU CN220815608U (en) | 2023-10-17 | 2023-10-17 | Coal seam hydraulic fracturing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220815608U true CN220815608U (en) | 2024-04-19 |
Family
ID=90705008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322788226.XU Active CN220815608U (en) | 2023-10-17 | 2023-10-17 | Coal seam hydraulic fracturing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220815608U (en) |
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2023
- 2023-10-17 CN CN202322788226.XU patent/CN220815608U/en active Active
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