CN209855850U - Enhanced gas extraction device for step-by-step permeability-increasing coal seam - Google Patents
Enhanced gas extraction device for step-by-step permeability-increasing coal seam Download PDFInfo
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- CN209855850U CN209855850U CN201920621864.3U CN201920621864U CN209855850U CN 209855850 U CN209855850 U CN 209855850U CN 201920621864 U CN201920621864 U CN 201920621864U CN 209855850 U CN209855850 U CN 209855850U
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- 238000000605 extraction Methods 0.000 title claims abstract description 121
- 239000003245 coal Substances 0.000 title claims abstract description 83
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 164
- 239000007789 gas Substances 0.000 claims abstract description 105
- 238000005553 drilling Methods 0.000 claims abstract description 93
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 82
- 239000007788 liquid Substances 0.000 claims abstract description 71
- 238000002347 injection Methods 0.000 claims abstract description 60
- 239000007924 injection Substances 0.000 claims abstract description 60
- 238000003860 storage Methods 0.000 claims abstract description 14
- 238000010257 thawing Methods 0.000 claims description 22
- 230000000750 progressive effect Effects 0.000 claims 4
- 230000035699 permeability Effects 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 12
- 230000000149 penetrating effect Effects 0.000 description 5
- 230000008014 freezing Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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Abstract
The step-by-step permeability-increasing coal seam enhanced gas extraction device comprises a water injection pump, a water tank, an ultrasonic transmitter, an ultrasonic control switch, an ultrasonic generator, a liquid nitrogen pump, a nitrogen making machine, an extraction pump and a gas storage tank, wherein at least two freeze-thaw drill holes are drilled in a coal seam, and a gas extraction drill hole is drilled in the coal seam between every two adjacent freeze-thaw drill holes; a water injection pipe and a liquid nitrogen pipe are inserted into each freeze-thaw drilling hole, each water injection pipe is connected with a water injection pump, and the water injection pump is connected with a water tank; a plurality of ultrasonic transmitters are arranged in each freeze-thaw drilling hole and are connected with ultrasonic control switches, and the ultrasonic control switches are connected with an ultrasonic generator; each liquid nitrogen pipe is connected with a liquid nitrogen pump, and the liquid nitrogen pump is connected with a nitrogen making machine; and an extraction pipe is inserted into each gas extraction drill hole, the extraction pipe is connected with an extraction pump, and the extraction pump is connected with a gas storage tank. The utility model discloses can make coal seam crack quantity and crack length promote by a wide margin, increase the coal seam gas permeability, provide good gas drainage condition.
Description
Technical Field
The utility model relates to a coal seam gas takes out and adopts technical field, specific theory relates to a gas is taken out and is adopted device is reinforceed in anti-reflection coal seam step by step.
Background
China is a big coal resource country and is rich in sufficient coal bed gas resources. The reserves of coal bed gas are equivalent to natural gas, and with the severity of global warming problems, coal bed gas is receiving more and more attention as a clean energy source. The countries such as the United states and Canada mainly develop low-rank coal bed gas, and the coal bed gas industry of the countries has good development. And the coal bed gas development in China is mainly focused on high-grade coal, and the coal bed gas industry development is laggard. Because high-order coal is deeply buried, the ground pressure is high, the permeability of coal is low, most gas is concentrated in tiny pores, and the gas extraction effect is poor, so that the coal bed gas industry in China is relatively lagged behind. In order to improve the gas extraction rate, a plurality of permeability increasing methods are proposed at home and abroad: a hydraulic fracturing permeability increasing method, a hydraulic slotting permeability increasing method, a gas explosion permeability increasing method, a loosening blasting permeability increasing method, a hydraulic punching permeability increasing method and the like. However, with deep underground mining, the existing permeability-increasing method cannot meet the production requirements of modern mines.
In order to solve the above problems, people are always seeking an ideal technical solution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gas drainage device is reinforceed in anti-reflection coal seam step by step, the utility model discloses can make coal seam crack quantity and crack length promote by a wide margin, increase the coal seam gas permeability, provide good gas drainage condition.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the step-by-step permeability-increasing coal seam reinforced gas extraction device comprises a hydraulic fracturing module, an ultrasonic fracturing module, a liquid nitrogen freeze-thaw module and a gas extraction module, wherein at least two freeze-thaw drill holes are drilled in a coal seam at intervals, a gas extraction drill hole is drilled in the coal seam between every two adjacent freeze-thaw drill holes, and the outer ends of the freeze-thaw drill holes and the gas extraction drill holes are plugged by hole packers;
the hydraulic fracturing module comprises a water injection pump and a water tank, wherein a water injection pipe is inserted into each freeze-thaw drilling hole along the length direction of the freeze-thaw drilling hole, the outer end of each water injection pipe penetrates through the corresponding hole packer and extends out of the corresponding freeze-thaw drilling hole, the outer ends of the water injection pipes are connected in parallel and are connected with the outlet end of the water injection pump, the outlet end of the water injection pump is provided with a water injection control valve, and the inlet end of the water injection pump is connected with the water tank;
the ultrasonic fracturing module comprises ultrasonic transmitters, an ultrasonic control switch and ultrasonic generators, wherein the ultrasonic transmitters are uniformly arranged in each freeze-thaw drilling hole along the length direction of the freeze-thaw drilling hole, the ultrasonic transmitters in each freeze-thaw drilling hole are sequentially connected in parallel and connected with the ultrasonic control switch through leads, and the ultrasonic control switch is connected with the ultrasonic generators;
the liquid nitrogen freeze-thawing module comprises a liquid nitrogen pump and a nitrogen making machine, a liquid nitrogen pipe is inserted into each freeze-thawing drill hole along the length direction of the freeze-thawing drill hole, the outer end of each liquid nitrogen pipe penetrates through the corresponding hole packer and extends out of the corresponding freeze-thawing drill hole, the outer ends of the liquid nitrogen pipes are connected in parallel and are connected with the outlet end of the liquid nitrogen pump, the outlet end of the liquid nitrogen pump is provided with a liquid nitrogen control valve, and the inlet end of the liquid nitrogen pump is connected with the nitrogen making machine;
the gas extraction module comprises an extraction pump and a gas storage tank, wherein an extraction pipe is inserted into each gas extraction drill hole along the length direction of the gas extraction drill hole, the outer end of each extraction pipe penetrates through the corresponding hole packer and extends out of the corresponding gas extraction drill hole, the outer ends of the extraction pipes are connected in parallel and are connected with the inlet end of the extraction pump, the inlet end of the extraction pump is provided with an extraction control valve, and the outlet end of the extraction pump is connected with the gas storage tank.
A supporting pipe is arranged in each freeze-thaw drilling hole along the length direction of the freeze-thaw drilling hole, one end of each supporting pipe is inserted into the hole packer, the ultrasonic transmitters in each freeze-thaw drilling hole are arranged on the outer side wall of each supporting pipe at equal intervals, and the conducting wires penetrate through the inside of the supporting pipes; the outlet end of the water injection pipe and the other end of the supporting pipe are positioned at the top of the inner end of the freeze-thaw drilling hole, and the outlet end of the liquid nitrogen pipe is positioned on the inner side of the hole packer and close to the hole packer.
The distance between two adjacent freeze-thaw drill holes is 6m, and the distance between the freeze-thaw drill hole and the gas extraction drill hole is 3 m.
The working frequency of the ultrasonic generator is 20-30kHz, and the maximum output power is 1000W.
The length of the freeze-thaw drilling hole and the gas extraction drilling hole is 30-100m, and the diameter of the freeze-thaw drilling hole and the gas extraction drilling hole is 80-110 mm.
By adopting the technical scheme, the use method of the step-by-step permeability-increasing coal seam reinforced gas extraction device comprises the following steps:
(1) drilling operation: drilling at least two freeze-thaw drill holes at intervals in a coal seam, drilling a gas extraction drill hole in the coal seam between every two adjacent freeze-thaw drill holes, wherein the distance between every two adjacent freeze-thaw drill holes is 6m, and the distance between each freeze-thaw drill hole and the gas extraction drill hole is 3 m;
(2) installing corresponding components of an ultrasonic fracturing module and a liquid nitrogen freezing and thawing module in the freezing and thawing borehole, and installing corresponding components of a gas extraction module in the gas extraction borehole;
(3) starting a water injection control valve and a water injection pump, pumping water in a water tank into each freeze-thaw drilling hole through a water injection pipe by the water injection pump until the water pressure in each freeze-thaw drilling hole reaches 10MPa, stopping injecting water into the freeze-thaw drilling holes, and closing the water injection control valve and the water injection pump, wherein the water in the freeze-thaw drilling holes performs primary fracturing on the coal bed;
(4) then starting an ultrasonic generator and switching on an ultrasonic control switch, continuously transmitting ultrasonic waves to the coal bed in each freeze-thaw drilling hole by each ultrasonic transmitter for 15min, performing secondary fracturing on the coal bed to achieve the effect of impacting the coal bed to generate new fractures, and then switching off the ultrasonic control switch and switching off the ultrasonic generator;
(5) opening a liquid nitrogen control valve, a liquid nitrogen pump and a nitrogen making machine, and injecting liquid nitrogen into each freeze-thaw drilling hole through a liquid nitrogen pipe, so that water in the freeze-thaw drilling holes is frozen and thawed into ice, and the coal bed is cracked for three times;
(6) repeating the step (5) for multiple times to completely freeze and thaw the freeze-thaw drill holes and the water in the coal seam, fully fracturing the coal seam, greatly increasing the number and the length of fractures of the coal seam, increasing the air permeability of the coal seam, and gathering the gas in the coal seam into the gas extraction drill holes;
(7) and opening the extraction pump, the gas storage tank and the extraction control valve, and pumping the gas in the gas extraction drill hole into the gas storage tank through the extraction pipe by the extraction pump.
The step (2) is specifically as follows: after the freeze-thaw drilling and gas extraction drilling construction is completed, respectively inserting a water injection pipe, a liquid nitrogen pipe and a supporting pipe into each freeze-thaw drilling along the axial direction of the freeze-thaw drilling, installing a plurality of ultrasonic transmitters on the outer side wall of the supporting pipe at equal intervals along the length direction of the supporting pipe, respectively inserting an extraction pipe into each gas extraction drilling along the axial direction of the gas extraction drilling, plugging the freeze-thaw drilling and the outer end of the gas extraction drilling by a hole packer, respectively penetrating the water injection pipe, the liquid nitrogen pipe and the supporting pipe through corresponding hole packers and extending out corresponding freeze-thaw drilling, and penetrating the extraction pipes through corresponding hole packers and extending out corresponding gas extraction drilling;
the outer ends of the extraction pipes are connected in parallel and are connected with the inlet end of an extraction pump, the outlet end of the extraction pump is connected with an air storage tank, the ultrasonic transmitters in each freeze-thaw drilling hole are connected in parallel and are connected with an ultrasonic control switch in sequence through conducting wires, the ultrasonic control switch is connected with an ultrasonic generator, the outer ends of the water injection pipes are connected in parallel and are connected with the outlet end of a water injection pump, the inlet end of the water injection pump is connected with a water tank, the outer ends of the liquid nitrogen pipes are connected in parallel and are connected with the outlet end of the liquid nitrogen pump, the inlet end of the liquid nitrogen pump is connected with a nitrogen making machine, an extraction control valve is installed on a pipeline of the inlet end of the extraction pump, a water injection control valve is installed on a pipeline of the outlet end of the water injection pump, and a liquid.
Compared with the prior art, the utility model has substantive characteristics and progress, specifically speaking, the utility model discloses combine hydraulic fracturing technique, ultrasonic wave fracturing technique, liquid nitrogen freeze thawing technique ingenious, bore and establish two at least freeze thawing drilling holes to the coal seam interval of locating, bore and establish a gas and take out the drilling hole in the coal seam between two adjacent freeze thawing drilling holes, pour into the water of certain pressure into through the water injection pump in each freeze thawing drilling hole, carry out the initial fracturing to the coal seam; then starting an ultrasonic generator, and continuously transmitting ultrasonic waves to the coal seam by each ultrasonic transmitter in each freeze-thaw drilling hole to perform secondary fracturing on the coal seam; and finally, a liquid nitrogen pump is started, liquid nitrogen is injected into each freeze-thaw drilling hole through a liquid nitrogen pipe, so that water in the freeze-thaw drilling holes is freeze-thawed into ice, the coal bed is cracked for three times, and liquid nitrogen is injected into each freeze-thaw drilling hole for multiple times, so that the freeze-thaw drilling holes and the water in the coal bed are completely freeze-thawed, the coal bed is fully cracked, the number of fractures and the length of the fractures of the coal bed are greatly increased, the air permeability of the coal bed is favorably increased, and good gas extraction conditions are provided.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1, the step-by-step permeability-increasing coal seam reinforced gas extraction device comprises a hydraulic fracturing module, an ultrasonic fracturing module, a liquid nitrogen freeze-thawing module and a gas extraction module, wherein two freeze-thaw drill holes 2 are drilled in a coal seam 1 at intervals, a gas extraction drill hole 3 is drilled in the coal seam 1 between the two freeze-thaw drill holes 2, and the outer ends of the freeze-thaw drill holes 2 and the gas extraction drill hole 3 are plugged by a hole packer 4;
the hydraulic fracturing module comprises a water injection pump 5 and a water tank 6, a water injection pipe 7 is inserted into each freeze-thaw drilling hole 2 along the length direction of the freeze-thaw drilling hole 2, the outer end of each water injection pipe 7 penetrates through the corresponding hole packer 4 and extends out of the corresponding freeze-thaw drilling hole 2, the outer end of each water injection pipe 7 is connected with the outlet end of the water injection pump 5 in parallel, the outlet end of the water injection pump 5 is provided with a water injection control valve 8, and the inlet end of the water injection pump 5 is connected with the water tank 6;
the ultrasonic fracturing module comprises ultrasonic transmitters 9, ultrasonic control switches 10 and ultrasonic generators 11, wherein the ultrasonic transmitters 9 are respectively and uniformly arranged in each freeze-thaw drilling hole 2 along the length direction of the freeze-thaw drilling hole 2, the ultrasonic transmitters 9 in each freeze-thaw drilling hole 2 are sequentially connected in parallel and connected with the ultrasonic control switches 10 through leads 12, and the ultrasonic control switches 10 are connected with the ultrasonic generators 10;
the liquid nitrogen freeze-thaw module comprises a liquid nitrogen pump 13 and a nitrogen making machine 14, a liquid nitrogen pipe 15 is inserted into each freeze-thaw drilling hole 2 along the length direction of the freeze-thaw drilling hole 2, the outer end of each liquid nitrogen pipe 15 penetrates through the corresponding hole packer 4 and extends out of the corresponding freeze-thaw drilling hole 2, the outer end of each liquid nitrogen pipe 15 is connected in parallel and connected with the outlet end of the liquid nitrogen pump 13, the outlet end of the liquid nitrogen pump 13 is provided with a liquid nitrogen control valve 16, and the inlet end of the liquid nitrogen pump 13 is connected with the nitrogen making machine 14;
the gas extraction module comprises an extraction pump 17 and a gas storage tank 18, an extraction pipe 19 is inserted into the gas extraction borehole 3 along the length direction of the gas extraction borehole 3, the outer end of the extraction pipe 19 penetrates through the corresponding hole packer 4 and extends out of the gas extraction borehole 3, the outer end of the extraction pipe 19 is connected with the inlet end of the extraction pump 17, an extraction control valve 20 is arranged at the inlet end of the extraction pump 17, and the outlet end of the extraction pump 17 is connected with the gas storage tank 18.
A supporting tube 21 is arranged in each freeze-thaw drilling hole 2 along the length direction of the freeze-thaw drilling hole 2, one end of the supporting tube 21 is inserted into the hole packer 4, the ultrasonic emitters 9 in each freeze-thaw drilling hole 2 are arranged on the outer side wall of the supporting tube 21 at equal intervals, and the lead 12 is arranged in the supporting tube 21 in a penetrating manner; the outlet end of the water injection pipe 7 and the other end of the support pipe 21 are positioned at the top of the inner end of the freeze-thaw drilling hole 2, and the outlet end of the liquid nitrogen pipe 15 is positioned inside the hole packer 4 and close to the hole packer 4.
The distance between the two freeze-thaw drill holes 2 is 6m, and the distance between the freeze-thaw drill hole 2 and the gas extraction drill hole 3 is 3 m.
The working frequency of the ultrasonic generator 10 is 20-30kHz, and the maximum output power is 1000W.
The length of the freeze-thaw drilling hole 2 and the length of the gas extraction drilling hole 3 are 30-100m, and the diameter of the freeze-thaw drilling hole and the diameter of the gas extraction drilling hole are 80-110 mm.
By adopting the technical scheme, the use method of the step-by-step permeability-increasing coal seam reinforced gas extraction device comprises the following steps:
(1) drilling operation: drilling at least two freeze-thaw drill holes 2 at intervals in the coal seam 1, drilling a gas extraction drill hole 3 in the coal seam 1 between every two adjacent freeze-thaw drill holes 2, wherein the distance between every two adjacent freeze-thaw drill holes 2 is 6m, and the distance between each freeze-thaw drill hole 2 and the gas extraction drill hole 3 is 3 m;
(2) installing corresponding components of an ultrasonic fracturing module and a liquid nitrogen freezing and thawing module in the freezing and thawing borehole 2, and installing corresponding components of a gas extraction module in the gas extraction borehole 3;
(3) starting a water injection control valve 8 and a water injection pump 5, pumping water in a water tank 6 into each freeze-thaw drilling hole 2 by the water injection pump 5 through a water injection pipe 7 until the water pressure in each freeze-thaw drilling hole 2 reaches 10MPa, stopping injecting water into the freeze-thaw drilling hole 2, and closing the water injection control valve 8 and the water injection pump 5, wherein the water in the freeze-thaw drilling hole 2 performs primary fracturing on the coal seam 1;
(4) then starting an ultrasonic generator 10 and switching on an ultrasonic control switch 10, continuously transmitting ultrasonic waves to the coal seam 1 by each ultrasonic transmitter 9 in each freeze-thaw drilling hole 2 for 15min, performing secondary fracturing on the coal seam 1 to achieve the effect of impacting the coal seam 1 to generate new fractures, and then switching off the ultrasonic control switch 10 and switching off the ultrasonic generator 10;
(5) opening a liquid nitrogen control valve 16, a liquid nitrogen pump 13 and a nitrogen making machine 14, and injecting liquid nitrogen into each freeze-thaw drilling hole 2 through a liquid nitrogen pipe 15, so that water in the freeze-thaw drilling holes 2 is frozen and thawed into ice, and the coal seam 1 is cracked for three times;
(6) repeating the step (5) for multiple times to completely freeze and thaw the freeze-thaw drill holes 2 and the water in the coal seam 1, fully fracturing the coal seam 1, greatly increasing the number and the length of fractures of the coal seam 1, increasing the air permeability of the coal seam 1, and gathering the gas in the coal seam 1 into the gas extraction drill hole 3;
(7) and (3) opening the extraction pump 17, the gas storage tank 18 and the extraction control valve 20, and extracting the gas in the gas extraction drilled hole 3 into the gas storage tank 18 through the extraction pipe 19 by the extraction pump 17.
The step (2) is specifically as follows: after the construction of the freeze-thaw drill holes 2 and the gas extraction drill holes 3 is completed, respectively inserting a water injection pipe 7, a liquid nitrogen pipe 15 and a support pipe 21 into each freeze-thaw drill hole 2 along the axial direction of the freeze-thaw drill hole 2, respectively, installing a plurality of ultrasonic transmitters 9 on the outer side wall of the support pipe 21 at equal intervals along the length direction of the support pipe 21, simultaneously respectively inserting an extraction pipe 19 into each gas extraction drill hole 3 along the axial direction of the gas extraction drill hole 3, then plugging the freeze-thaw drill hole 2 and the outer ends of the gas extraction drill holes 3 by using the hole packer 4, respectively penetrating the water injection pipe 7, the liquid nitrogen pipe 15 and the support pipe 21 through the corresponding hole packer 4 and extending out of the corresponding freeze-thaw drill hole 2, and penetrating the extraction pipe 19 through the corresponding hole packer 4 and extending out of the corresponding gas extraction drill hole 3;
(2) the outer ends of the extraction pipes 19 are connected in parallel with the inlet end of an extraction pump 17, the outlet end of the extraction pump 17 is connected with an air storage tank 18, the ultrasonic transmitters 9 in each freeze-thaw drilling hole 2 are sequentially connected in parallel with an ultrasonic control switch 10 through leads 12, the ultrasonic control switch 10 is connected with an ultrasonic generator 10, the outer ends of the water injection pipes 7 are connected in parallel with the outlet end of the water injection pump 5, the inlet end of the water injection pump 5 is connected with a water tank 6, the outer ends of the liquid nitrogen pipes 15 are connected in parallel with the outlet end of a liquid nitrogen pump 13, the inlet end of the liquid nitrogen pump 13 is connected with a nitrogen generator 14, the extraction control valve 20 is installed on a pipeline at the inlet end of the extraction pump 17, the water injection control valve 8 is installed on a pipeline at the outlet end of the water injection pump 5, and the liquid nitrogen control valve 16 is installed on a pipeline at the outlet end of the liquid.
The utility model skillfully combines the hydraulic fracturing technology, the ultrasonic fracturing technology and the liquid nitrogen freeze-thawing technology, at least two freeze-thaw drill holes 2 are drilled at intervals in the coal seam 1, a gas extraction drill hole 3 is drilled in the coal seam 1 between two adjacent freeze-thaw drill holes 2, water with certain pressure is injected into each freeze-thaw drill hole 2 through a water injection pump 5, and the coal seam 1 is subjected to primary fracturing; then starting an ultrasonic generator 10, and continuously transmitting ultrasonic waves to the coal seam 1 by each ultrasonic transmitter 9 in each freeze-thaw drilling hole 2 to perform secondary fracturing on the coal seam 1; and finally, a liquid nitrogen pump 13 is started, liquid nitrogen is injected into each freeze-thaw drilling hole 2 through a liquid nitrogen pipe 15, so that water in the freeze-thaw drilling holes 2 is freeze-thawed into ice, the coal seam 1 is cracked for three times, liquid nitrogen is injected into each freeze-thaw drilling hole 2 for multiple times, the water in the freeze-thaw drilling holes 2 and the water in the coal seam 1 are completely freeze-thawed, the coal seam 1 is fully fractured, the number of fractures and the length of the fractures of the coal seam 1 are greatly increased, the gas permeability of the coal seam 1 is favorably increased, and good gas extraction conditions are provided.
The utility model discloses well hole packer 4, ultrasonic transmitter 9, ultrasonic wave control switch 10, supersonic generator 11 and nitrogen generator 14 are current conventional part, and concrete structure and theory of operation are no longer repeated.
The above embodiments are only used for illustrating but not limiting the technical solution of the present invention, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the invention, which should be construed as being limited only by the claims.
Claims (5)
1. Enhanced gas drainage device in permeability-increasing coal seam step by step, its characterized in that: the system comprises a hydraulic fracturing module, an ultrasonic fracturing module, a liquid nitrogen freeze-thawing module and a gas extraction module, wherein at least two freeze-thawing drill holes are drilled in a coal seam at intervals, a gas extraction drill hole is drilled in the coal seam between every two adjacent freeze-thawing drill holes, and the outer ends of the freeze-thawing drill holes and the gas extraction drill holes are plugged through hole packers;
the hydraulic fracturing module comprises a water injection pump and a water tank, wherein a water injection pipe is inserted into each freeze-thaw drilling hole along the length direction of the freeze-thaw drilling hole, the outer end of each water injection pipe penetrates through the corresponding hole packer and extends out of the corresponding freeze-thaw drilling hole, the outer ends of the water injection pipes are connected in parallel and are connected with the outlet end of the water injection pump, the outlet end of the water injection pump is provided with a water injection control valve, and the inlet end of the water injection pump is connected with the water tank;
the ultrasonic fracturing module comprises ultrasonic transmitters, an ultrasonic control switch and ultrasonic generators, wherein the ultrasonic transmitters are uniformly arranged in each freeze-thaw drilling hole along the length direction of the freeze-thaw drilling hole, the ultrasonic transmitters in each freeze-thaw drilling hole are sequentially connected in parallel and connected with the ultrasonic control switch through leads, and the ultrasonic control switch is connected with the ultrasonic generators;
the liquid nitrogen freeze-thawing module comprises a liquid nitrogen pump and a nitrogen making machine, a liquid nitrogen pipe is inserted into each freeze-thawing drill hole along the length direction of the freeze-thawing drill hole, the outer end of each liquid nitrogen pipe penetrates through the corresponding hole packer and extends out of the corresponding freeze-thawing drill hole, the outer ends of the liquid nitrogen pipes are connected in parallel and are connected with the outlet end of the liquid nitrogen pump, the outlet end of the liquid nitrogen pump is provided with a liquid nitrogen control valve, and the inlet end of the liquid nitrogen pump is connected with the nitrogen making machine;
the gas extraction module comprises an extraction pump and a gas storage tank, wherein an extraction pipe is inserted into each gas extraction drill hole along the length direction of the gas extraction drill hole, the outer end of each extraction pipe penetrates through the corresponding hole packer and extends out of the corresponding gas extraction drill hole, the outer ends of the extraction pipes are connected in parallel and are connected with the inlet end of the extraction pump, the inlet end of the extraction pump is provided with an extraction control valve, and the outlet end of the extraction pump is connected with the gas storage tank.
2. The progressive permeability-increasing coal seam reinforced gas extraction device according to claim 1, characterized in that: a supporting pipe is arranged in each freeze-thaw drilling hole along the length direction of the freeze-thaw drilling hole, one end of each supporting pipe is inserted into the hole packer, the ultrasonic transmitters in each freeze-thaw drilling hole are arranged on the outer side wall of each supporting pipe at equal intervals, and the conducting wires penetrate through the inside of the supporting pipes; the outlet end of the water injection pipe and the other end of the supporting pipe are positioned at the top of the inner end of the freeze-thaw drilling hole, and the outlet end of the liquid nitrogen pipe is positioned on the inner side of the hole packer and close to the hole packer.
3. The progressive permeability-increasing coal seam reinforced gas extraction device according to claim 1, characterized in that: the distance between two adjacent freeze-thaw drill holes is 6m, and the distance between the freeze-thaw drill hole and the gas extraction drill hole is 3 m.
4. The progressive permeability-increasing coal seam enhanced gas extraction device according to claim 1, 2 or 3, characterized in that: the working frequency of the ultrasonic generator is 20-30kHz, and the maximum output power is 1000W.
5. The progressive permeability-increasing coal seam reinforced gas extraction device according to claim 4, characterized in that: the length of the freeze-thaw drilling hole and the gas extraction drilling hole is 30-100m, and the diameter of the freeze-thaw drilling hole and the gas extraction drilling hole is 80-110 mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915199A (en) * | 2019-05-05 | 2019-06-21 | 河南理工大学 | Gas drainage device and its application method are strengthened in anti-reflection coal seam step by step |
| CN111173513A (en) * | 2020-03-16 | 2020-05-19 | 中国矿业大学 | Low-temperature fracturing roof caving method for hard roof of coal mine goaf |
| CN111472685A (en) * | 2020-04-16 | 2020-07-31 | 四川省科建煤炭产业技术研究院有限公司 | Intermittent dynamic condensation deep hole drilling method |
| CN113234503A (en) * | 2021-06-03 | 2021-08-10 | 中国地质大学（北京） | Low-coal-rank coal bed gas high-efficiency mining dust treatment device |
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2019
- 2019-05-05 CN CN201920621864.3U patent/CN209855850U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915199A (en) * | 2019-05-05 | 2019-06-21 | 河南理工大学 | Gas drainage device and its application method are strengthened in anti-reflection coal seam step by step |
| CN109915199B (en) * | 2019-05-05 | 2024-05-07 | 河南理工大学 | Progressive permeability-increasing coal seam reinforced gas extraction device and use method thereof |
| CN111173513A (en) * | 2020-03-16 | 2020-05-19 | 中国矿业大学 | Low-temperature fracturing roof caving method for hard roof of coal mine goaf |
| CN111173513B (en) * | 2020-03-16 | 2020-11-27 | 中国矿业大学 | Low-temperature fracturing roof caving method for hard roof of coal mine goaf |
| CN111472685A (en) * | 2020-04-16 | 2020-07-31 | 四川省科建煤炭产业技术研究院有限公司 | Intermittent dynamic condensation deep hole drilling method |
| CN111472685B (en) * | 2020-04-16 | 2021-10-01 | 四川省科建煤炭产业技术研究院有限公司 | Intermittent dynamic condensation deep hole drilling method |
| CN113234503A (en) * | 2021-06-03 | 2021-08-10 | 中国地质大学（北京） | Low-coal-rank coal bed gas high-efficiency mining dust treatment device |
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