CN107100664B - Hot-cold alternative coal breaking permeability-increasing gas enhanced extraction system and method - Google Patents
Hot-cold alternative coal breaking permeability-increasing gas enhanced extraction system and method Download PDFInfo
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- CN107100664B CN107100664B CN201710325902.6A CN201710325902A CN107100664B CN 107100664 B CN107100664 B CN 107100664B CN 201710325902 A CN201710325902 A CN 201710325902A CN 107100664 B CN107100664 B CN 107100664B
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- 238000000605 extraction Methods 0.000 title claims abstract description 228
- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title description 14
- 239000007789 gas Substances 0.000 claims abstract description 241
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 207
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 104
- 239000007788 liquid Substances 0.000 claims abstract description 64
- 238000003860 storage Methods 0.000 claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 230000007246 mechanism Effects 0.000 claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 238000004080 punching Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 230000001965 increasing effect Effects 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005422 blasting Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Extraction Or Liquid Replacement (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a hot-cold alternative coal-breaking permeability-increasing gas enhanced extraction system which comprises a gas extraction drill hole, an impact treatment drill hole, a bearing frame, a traveling mechanism, a liquid nitrogen storage steel cylinder, a high-pressure hot air blower, a liquid nitrogen booster pump, a temperature sensor, a pressure sensor, a gas flowmeter, a punch pipe, a pressure relief pipe, a gas extraction pump and a control circuit, wherein the gas extraction drill hole and the impact treatment drill hole are embedded in the wall of a coal seam, and the liquid nitrogen storage steel cylinder, the high-pressure hot air blower, the liquid nitrogen booster pump, the gas extraction pump and the control circuit are all arranged on the upper surface of the bearing frame through sliding rails and are in sliding connection with the bearing frame; the implementation mode comprises three steps of drilling, prefabricating drilling, circulating impact permeability-increasing extraction and the like. The invention effectively improves the effect and efficiency of fracturing permeability-increasing operation on one hand, and can perform gas extraction operation while performing permeability-increasing operation on the other hand.
Description
Technical Field
The invention relates to a heat-cold alternative coal breaking permeability-increasing gas enhanced extraction system and method, and belongs to the technical field of gas extraction.
Background
The method is characterized in that a plurality of underground gas extraction equipment methods are provided in China, the existing permeability-increasing technology mainly adopted for the coal seam with high gas and low gas permeability comprises large-aperture drilling, hydraulic punching, hydraulic slotting, hydraulic fracturing, deep hole blasting, chemical permeability increasing and the like, the hydraulic fracturing measure is one of common coal seam permeability increasing measures, but the measure has the technical problems of poor yield increasing effect, waste of water resource pollution and the like, and meanwhile, when the permeability-increasing operation is carried out on the gas extraction drilling hole, the permeability-increasing operation is usually directly carried out on the gas extraction drilling hole, although the use requirement can be met, on one hand, the sealing damage of the gas extraction hole is easily caused due to the structural damage of the gas extraction hole, so that the gas leakage is caused, on the other hand, when the permeability-increasing operation is carried out, the gas leakage is caused, the working efficiency of the gas extraction operation is also seriously influenced, so that the gas extraction operation is carried out while the gas leakage is caused, the whole new gas extraction operation is urgently required, and the risk of the gas extraction operation is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a hot-cold alternative coal-breaking permeability-increasing gas enhanced extraction system and method, a blasting impact implementation method, a using method of the blasting impact implementation method and a using method of the blasting impact implementation method.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a hot-cold alternative coal-breaking permeability-increasing gas enhanced extraction system comprises a gas extraction drill hole, an impact treatment drill hole, a bearing frame, a traveling mechanism, a liquid nitrogen storage steel cylinder, a high-pressure air heater, a liquid nitrogen booster pump, a temperature sensor, a pressure sensor, a gas flowmeter, a punch pipe, a pressure relief pipe, a gas extraction pump and a control circuit, wherein the gas extraction drill hole and the impact treatment drill hole are embedded in a coal seam wall, the included angle between the axis of the gas extraction drill hole and the axis of the impact treatment drill hole and the front surface of the coal seam wall is 90 degrees, the included angle between the axis of the gas extraction drill hole and the axis of the impact treatment drill hole is 0 degree, the aperture of the gas extraction drill hole and the aperture of the impact treatment drill hole are 60-100 mm, the depth is 50-80 m, and the distance between the gas extraction drill hole and the interval between the impact treatment drill hole are 2-5 m, wherein, in the gas extraction drill holes and the impact treatment drill holes, three gas extraction drill holes and one impact treatment drill hole form an extraction operation group, at least two gas extraction operation groups are uniformly distributed on the coal seam wall, the three gas extraction drill holes in the extraction operation group are distributed in a triangular structure, the impact treatment drill holes are positioned in the triangular structure formed by the three gas extraction drill holes, the distance from the axis of the impact treatment drill hole to the axis of the three gas extraction drill holes is the same, a plurality of stamping pipes, pressure relief pipes and gas extraction pipes are arranged, wherein the gas extraction pipes are embedded in the gas extraction drill holes and are coaxially distributed with the gas extraction drill holes, one stamping pipe and one pressure relief pipe form an impact group, the impact group is embedded in the impact treatment drill holes, one impact group is arranged in each impact treatment drill hole, and the impact groups and the impact treatment drill holes are coaxially distributed, the gas extraction pipe and the impact group are respectively connected with the front end ports of the gas extraction drill hole and the impact treatment drill hole through a pressure self-adaptive bag, the drill holes are sealed by the pressure self-adaptive bag, the temperature sensor and the pressure sensor are respectively and uniformly distributed on the outer surfaces of a punch pipe and a pressure relief pipe of each impact group, the gas flowmeter is arranged on the outer surface of each gas extraction pipe, the punch pipe is respectively and mutually communicated with a liquid nitrogen booster pump and a high-pressure hot air blower through an air duct, wherein the liquid nitrogen booster pump is mutually communicated with a liquid nitrogen storage steel cylinder, the high-pressure hot air blower is mutually communicated with a nitrogen storage steel cylinder, one end of the pressure relief pipe is embedded in the impact treatment drill hole, and the other end of the pressure relief pipe is positioned outside the impact treatment drill hole, and a pressure relief valve is arranged on a pressure relief pipe positioned outside the impact treatment drill hole, the gas extraction pipe is communicated with a gas extraction pump, a liquid nitrogen storage steel bottle, a high-pressure hot air blower, a liquid nitrogen booster pump, the gas extraction pump and a control circuit are arranged on the upper surface of a bearing frame through a slide rail and are in sliding connection with the bearing frame, the lower surface of the bearing frame is connected with a travelling mechanism, the high-pressure hot air blower, the liquid nitrogen booster pump and an air guide pipe, the liquid nitrogen storage steel bottle, a control valve is arranged at the connection position of the nitrogen storage steel bottle, and the control circuit is respectively electrically connected with the travelling mechanism, the high-pressure hot air blower, the liquid nitrogen booster pump, a temperature sensor, a pressure sensor, a gas flowmeter and the gas extraction pump.
Furthermore, the liquid nitrogen storage steel cylinder and the nitrogen storage steel cylinder are at least one, and when the number of the liquid nitrogen storage steel cylinders and the number of the nitrogen storage steel cylinders are two or more, the liquid nitrogen storage steel cylinders and the nitrogen storage steel cylinders are connected in parallel.
Furthermore, the punching pipe and the pressure relief pipe in the impact group are connected through at least two positioning hoops.
Further, bear the frame and include base, work panel, lift actuating mechanism, revolving stage mechanism, guide block and guided way, the base be the frame construction of rectangle for the cross section, the work panel pass through lift actuating mechanism and install directly over the base and with the coaxial distribution of base, lift actuating mechanism distribute with base and work panel mutually perpendicular respectively, lift actuating mechanism terminal pass through revolving stage mechanism and base interconnect, the guided way install and be the annular structure distribution around revolving stage mechanism axis at the base upper surface, the guide block at least two, encircle work panel axis and distribute at work panel lower surface, just the terminal and guided way sliding connection of guide block.
Furthermore, the guide block comprises a telescopic rod, a guide wheel and a bearing spring, wherein the axis of the telescopic rod is hinged with the lower surface of the working panel and forms an included angle of 0-90 degrees, the guide wheel is connected with the front end of the telescopic rod through a wheel carrier and is embedded in the guide rail, the bearing spring is coated outside the telescopic rod, and the two ends of the bearing spring are respectively abutted against the lower surface of the working panel and the wheel carrier.
An extraction method of a heat-cold alternative coal-breaking permeability-increasing gas enhanced extraction system comprises the following steps:
firstly, drilling holes, namely, according to the requirements of design and mining operation, forming a plurality of gas extraction drill holes and a plurality of impact treatment drill holes on the side surface of the coal seam wall of an operation surface, wherein the axes of the gas extraction drill holes and the impact treatment drill holes form an included angle of 90 degrees with the front surface of the coal seam wall, the included angles between the axes of the gas extraction drill holes and the impact treatment drill holes are 0 degree, the apertures of the gas extraction drill holes and the impact treatment drill holes are 60-100 mm and the depth is 50-80 m, the distance between the gas extraction drill holes and the distance between the gas extraction drill holes and the impact treatment drill holes are 2-5 m, the three gas extraction drill holes and the one impact treatment drill holes form one gas extraction operation group, at least two gas extraction operation groups are uniformly distributed on the wall, the three gas extraction drill holes in the gas extraction operation group are distributed in a triangular structure, and the impact treatment drill holes are positioned in the triangular structure formed by the three gas extraction drill holes, and the distances between the axes of the impact treatment drill holes are the same;
secondly, prefabricating a drill hole, after the operation of the first step is finished, installing a gas extraction pipe into the gas extraction drill hole through a pressure self-adaptive bag, sealing the port of the gas extraction pipe by the pressure self-adaptive bag, installing an impact group into the impact treatment drill hole through the pressure self-adaptive bag, sealing the port of the impact treatment drill hole by the pressure self-adaptive bag, then communicating the gas extraction pipe with a gas extraction pump, communicating a punch pipe in the impact group with a high-pressure hot air blower and a liquid nitrogen booster pump through gas guide pipes, finally communicating the high-pressure hot air blower and the liquid nitrogen booster pump with a liquid nitrogen storage steel bottle and a nitrogen storage steel bottle respectively, and electrically connecting a control circuit with each electrical device,
thirdly, circularly impacting and permeability-increasing extraction operation, after the second operation is completed, firstly heating the nitrogen in the nitrogen storage steel cylinder to 200-300 ℃ by a high-pressure hot air blower, pressurizing to 2-5 MPa, then guiding the nitrogen into the impact treatment drill hole through a punching pipe, injecting the nitrogen into the impact treatment drill hole, simultaneously performing gas extraction on three gas extraction drill holes at the periphery of the impact treatment drill hole through a gas extraction pump, and when the gas flow of the gas extraction drill hole is reduced and stabilized to 0.003-0.009 m 3 And in the time of/min, closing the high-pressure air heater, stopping conveying high-temperature nitrogen to the impact treatment drill hole, simultaneously pressurizing liquid nitrogen in a liquid nitrogen storage steel cylinder to 2-5 MPa by a liquid nitrogen booster pump, conveying the liquid nitrogen into the impact treatment drill hole, cooling the impact treatment drill hole, injecting the liquid nitrogen into the impact treatment drill hole, simultaneously performing gas extraction on three gas extraction drill holes at the periphery of the impact treatment drill hole by a gas extraction pump, and reducing the gas flow in the gas extraction drill hole to 0.003-0.009 m 3 And during the time of/min, closing the liquid nitrogen booster pump to complete an impact anti-reflection cycle, returning to the running state of the starting pressure hot air blower in the impact anti-reflection cycle after completing the impact anti-reflection cycle, thereby realizing cold and hot cycle impact anti-reflection operation on the impact treated drill hole while gas extraction is carried out, and continuously reducing the gas flow in the gas extraction drill hole to 0.003-0.009 m 3 After min, ending the cold and hot circulating impact anti-reflection operation on the impact processing drilling hole,when high-temperature nitrogen and liquid nitrogen are introduced into the impact treatment drill hole for operation, after the pressure in the impact treatment drill hole is larger than the set pressure of a pressure release valve on a pressure release pipe, the pressure of the high-temperature nitrogen in the impact treatment drill hole is released by the pressure release pipe.
Further, when the gas extraction drill holes and the impact treatment drill holes in the first step are simultaneously formed on both sides of the coal seam wall, the gas extraction drill holes and the impact treatment drill holes are distributed at intervals, and the stubble pressing length of not less than 10m is arranged at the tail end positions of the adjacent gas extraction drill holes and the adjacent impact treatment drill holes.
Furthermore, the total area of the coal seam wall covered by the extraction operation group in the first step is more than 90% of the area of the coal seam wall.
Further, the pressure of the pressure relief valve in the third step is set to be 5MPa.
The device structure and the implementation method are simple and flexible, the operation cost is low, on one hand, the effect and the efficiency of fracturing permeability-increasing operation are effectively improved, so that the gas extraction flow and the extraction efficiency of the drill hole are greatly improved, the effective coverage range of the gas extraction operation of the drill hole coal seam is increased, the purpose of reducing the gas extraction cost is effectively achieved while the extraction period is prolonged, on the other hand, the gas extraction operation can be synchronously performed while the permeability-increasing operation is effectively realized, the phenomenon that the gas extraction hole sealing structure is damaged by the permeability-increasing operation is greatly reduced, the resource waste phenomenon, the environmental pollution and the flammable and explosive risks caused by gas leakage are effectively reduced while the gas extraction operation efficiency is improved, and the purposes of improving the safety and the reliability of the gas extraction operation are achieved.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description;
FIG. 1 shows the distribution structure of gas extraction drilled holes and impact treatment drilled holes on the surface of a coal seam wall;
FIG. 2 is a schematic diagram of a side view distribution structure of gas extraction drill holes and impact treatment drill holes in a coal seam wall;
FIG. 3 is a schematic diagram of the system of the present invention;
FIG. 4 is a flow chart of a method of use of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The heat-cooling alternate coal-breaking permeability-increasing gas enhanced extraction system comprises a gas extraction drill hole 1, an impact processing drill hole 2, a bearing frame 3, a traveling mechanism 4, a liquid nitrogen storage steel cylinder 5, a nitrogen storage steel cylinder 6, a high-pressure air heater 7, a liquid nitrogen booster pump 8, a temperature sensor 9, a pressure sensor 10, a gas flowmeter 11, a punching pipe 12, a pressure relief pipe 13, a gas extraction pipe 14, a gas extraction pump 15 and a control circuit 16, wherein the gas extraction drill hole 1 and the impact processing drill hole 2 are embedded in a coal seam wall 17, an included angle of 90 degrees is formed between the axis of the gas extraction drill hole 1 and the axis of the impact processing drill hole 2 and the front surface of the coal seam wall 17, an included angle of 0 degree is formed between the axes of the gas extraction drill hole 1 and the impact processing drill hole 2, the aperture of the gas extraction drill hole 1 and the impact processing drill hole 2 is 60 mm-100 mm, the depth is 50 m-80 m, the gas extraction drill holes 1 and the impact processing drill hole 2 are distributed between the gas extraction drill holes 1 and the impact processing drill hole 2, the distance of the three drill holes 1 and the impact processing drill holes 2 is at least one of the same, and the three impact processing drill holes 2 is distributed in a triangle-drilling operation group, and the three gas extraction drill hole 1 and the three impact processing drill holes 2 are distributed in the impact processing operation of the three impact processing drill hole 1 and the impact processing operation of the impact processing group, and the three impact processing group.
In the embodiment, the number of the punching pipes 12, the pressure relief pipes 13 and the number of the gas extraction pipes 14 are multiple, wherein the gas extraction pipes 14 are embedded in the gas extraction drill holes 1 and are coaxially distributed with the gas extraction drill holes 1, one punching pipe 12 and one pressure relief pipe 13 in the punching pipes 12 and the pressure relief pipes 13 form an impact group, the impact group is embedded in the impact treatment drill holes 2, an impact group is arranged in each impact treatment drill hole 2 and is coaxially distributed with the impact treatment drill holes 2, the gas extraction pipes 14 and the impact group are respectively connected with front end ports of the gas extraction drill holes 1 and the impact treatment drill holes 2 through pressure self-adaptive bags 18, and the drill holes are sealed through the pressure self-adaptive bags 18.
In this embodiment, the temperature sensor 9 and the pressure sensor 10 are respectively and uniformly distributed on the outer surfaces of the punch pipe 12 and the pressure relief pipe 13 of each impact group, the gas flowmeter 11 is installed on the outer surface of each gas extraction pipe 14, the punch pipe 12 is respectively and mutually communicated with the liquid nitrogen booster pump 8 and the high-pressure hot air blower 7 through the gas guide pipe 19, wherein the liquid nitrogen booster pump 8 is mutually communicated with the liquid nitrogen storage steel cylinder 5, the high-pressure hot air blower 7 is mutually communicated with the nitrogen storage steel cylinder 6, one end of the pressure relief pipe 13 is embedded in the impact treatment drill hole 2, the other end of the pressure relief pipe is positioned outside the impact treatment drill hole 2, the pressure relief valve 20 is arranged on the pressure relief pipe 13 positioned outside the impact treatment drill hole 2, the gas extraction pipe 14 is mutually communicated with the gas pump 15, the liquid nitrogen storage steel cylinder 5, the nitrogen storage steel cylinder 6, the high-pressure hot air blower 7, the liquid nitrogen booster pump 8, the gas extraction pump 15 and the control circuit 16 are all installed on the upper surface of the bearing frame 3 through the slide rail 21 and are in sliding connection with the hot air blower 3, the lower surface of the bearing frame 3 is mutually connected with the traveling mechanism 4, the high-pressure sensor 9 and the gas flowmeter 11 are respectively connected with the gas extraction pump 7, the gas flowmeter 11 and the gas flowmeter 11.
In this embodiment, at least one of the liquid nitrogen storage steel cylinders 5 and the nitrogen storage steel cylinders 6 is provided, and when two or more of the liquid nitrogen storage steel cylinders 5 and the nitrogen storage steel cylinders 6 are provided, the liquid nitrogen storage steel cylinders 5 and the nitrogen storage steel cylinders 6 are connected in parallel.
In this embodiment, the pressing pipe 12 and the pressure relief pipe 13 in the impact set are connected by at least two positioning hoops 23.
In this embodiment, the carriage 3 includes a base 31, a working panel 32, a lifting driving mechanism 33, a turntable mechanism 34, a guide block 35 and a guide rail 36, the base 31 is a frame structure with a rectangular cross section, the working panel 32 is installed right above the base 31 through the lifting driving mechanism 33 and coaxially distributed with the base 31, the lifting driving mechanism 33 is respectively vertically distributed with the base 31 and the working panel 32, the tail end of the lifting driving mechanism 33 is connected with the base 31 through the turntable mechanism 34, the guide rail 35 is installed on the upper surface of the base and distributed in an annular structure around the axis of the turntable mechanism 34, at least two guide blocks 35 are distributed on the lower surface of the working panel 32 around the axis of the working panel 32, and the tail end of the guide block 35 is slidably connected with the guide rail 36.
In this embodiment, the guide block 35 includes an expansion link 351, a guide wheel 352, and a bearing spring 353, wherein an axis of the expansion link 351 is hinged to the lower surface of the working panel 32 and forms an included angle of 0 ° to 90 °, the guide wheel 352 is connected to a front end of the expansion link 351 through a wheel frame 354, the guide wheel 352 is embedded in the guide rail 36, the bearing spring 353 covers the expansion link 351, and two ends of the bearing spring 353 respectively abut against the lower surface of the working panel 32 and the wheel frame 354.
As shown in fig. 4, an extraction method of a hot and cold alternative coal-breaking permeability-increasing gas enhanced extraction system includes the following steps:
firstly, forming drill holes, namely forming a plurality of gas extraction drill holes and a plurality of impact treatment drill holes on the lateral surface of the coal seam wall of an operation surface according to the requirements of design and mining operation, wherein the axes of the gas extraction drill holes and the impact treatment drill holes form an included angle of 90 degrees with the front surface of the coal seam wall, the axial lines of the gas extraction drill holes and the impact treatment drill holes form an included angle of 0 degree, the apertures of the gas extraction drill holes and the impact treatment drill holes are 60-100 mm and the depth is 50-80 m, the distances between the gas extraction drill holes and between the gas extraction drill holes and the impact treatment drill holes are 2-5 m, the three gas extraction drill holes and one impact treatment drill hole form a gas extraction operation group, at least two gas extraction operation groups are uniformly distributed on the wall, the three gas extraction drill holes in the gas extraction operation group are distributed in a triangular structure, the impact treatment drill holes are positioned in the triangular structure formed by the three gas extraction drill holes, and the axial lines of the three impact treatment drill holes are the same in distance to the axial lines of the gas extraction drill holes;
secondly, prefabricating a drill hole, after the operation of the first step is finished, installing a gas extraction pipe into the gas extraction drill hole through a pressure self-adaptive bag, sealing the port of the gas extraction pipe by the pressure self-adaptive bag, installing an impact group into the impact treatment drill hole through the pressure self-adaptive bag, sealing the port of the impact treatment drill hole by the pressure self-adaptive bag, then communicating the gas extraction pipe with a gas extraction pump, communicating a punch pipe in the impact group with a high-pressure hot air blower and a liquid nitrogen booster pump through gas guide pipes, finally communicating the high-pressure hot air blower and the liquid nitrogen booster pump with a liquid nitrogen storage steel bottle and a nitrogen storage steel bottle respectively, and electrically connecting a control circuit with each electrical device,
thirdly, circulating the impact permeability-increasing extraction operation, after the second step of operation is finished, firstly heating the nitrogen in the nitrogen storage steel cylinder to 200-300 ℃ by a high-pressure hot air blower, boosting the nitrogen to 2-5 MPa, then guiding the nitrogen into the impact treatment drill hole through a punching pipe, injecting the nitrogen into the impact treatment drill hole, simultaneously performing gas extraction on three gas extraction drill holes at the periphery of the impact treatment drill hole through a gas extraction pump, and when the temperature in the gas extraction drill hole reaches 100 ℃ and the gas flow rate is reduced to 0.003-0.009 m 3 And when any item in the/min is available, the high-pressure air heater is turned off, the high-temperature nitrogen conveying operation to the impact treatment drill hole is stopped, liquid nitrogen in a liquid nitrogen storage steel cylinder is pressurized to 2-5 MPa by a liquid nitrogen booster pump and conveyed into the impact treatment drill hole, the impact treatment drill hole is cooled, three gas extraction drill holes at the periphery of the impact treatment drill hole are subjected to gas extraction by a gas extraction pump while liquid nitrogen is injected into the impact treatment drill hole, and the gas flow in the gas extraction drill hole is reduced to 0.003-0.009 m 3 And during the time of/min, closing the liquid nitrogen booster pump to complete an impact anti-reflection cycle, returning to the running state of the starting pressure hot air blower in the impact anti-reflection cycle after completing the impact anti-reflection cycle, thereby realizing cold and hot cycle impact anti-reflection operation on the impact treated drill hole while gas extraction is carried out, and continuously reducing the gas flow in the gas extraction drill hole to 0.003-0.009 m 3 After/min, finish cooling the impact treated drilled holeAnd (3) performing thermal cycle impact permeability improvement operation, wherein when high-temperature nitrogen and liquid nitrogen are introduced into the impact treatment drill hole for operation, after the pressure in the impact treatment drill hole is greater than the set pressure of a pressure release valve on the pressure release pipe, the pressure release pipe releases the pressure of the high-temperature nitrogen in the impact treatment drill hole.
In this embodiment, when the gas extraction drill holes and the impact treatment drill holes in the first step are simultaneously drilled on both sides of the coal seam wall, the gas extraction drill holes and the impact treatment drill holes are distributed at intervals, and the stubble pressing length of not less than 10m is arranged at the tail end of each adjacent gas extraction drill hole and each adjacent impact treatment drill hole
In this embodiment, the total area of the coal seam wall covered by the extraction operation group in the first step is more than 90% of the area of the coal seam wall.
In this embodiment, the pressure of the pressure relief valve in the third step is set to 5 to 8 MPa.
The equipment structure and the implementation method are simple and flexible, the operation cost is low, on one hand, the effect and the efficiency of fracturing permeability-increasing operation are effectively improved, so that the gas extraction flow and the extraction efficiency of the drilled hole are greatly improved, the effective coverage range of the gas extraction operation of the drilled coal seam is increased, the purpose of reducing the gas extraction cost is effectively achieved while the extraction period is prolonged, on the other hand, the gas extraction operation can be synchronously performed while the permeability-increasing operation is effectively realized, the phenomenon that the gas extraction hole sealing structure is damaged by the permeability-increasing operation is greatly reduced, the resource waste phenomenon, the environmental pollution, the flammable and the explosive risks caused by gas leakage are effectively reduced while the gas extraction operation efficiency is improved, and the purposes of improving the safety and the reliability of the gas extraction operation are achieved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A hot and cold alternative coal breaking permeability-increasing gas enhanced extraction system is characterized in that: the hot-cold alternative coal-breaking permeability-increasing gas reinforced extraction system comprises a gas extraction drill hole, an impact treatment drill hole, a bearing frame, a traveling mechanism, a liquid nitrogen storage steel cylinder, a high-pressure air heater, a liquid nitrogen booster pump, a temperature sensor, a pressure sensor, a gas flowmeter, a punch pipe, a pressure relief pipe, a gas extraction pump and a control circuit, wherein the gas extraction drill hole and the impact treatment drill hole are embedded in the wall of a coal seam, the gas extraction drill hole and the impact treatment drill hole are perpendicular to the coal wall and form an included angle of 90 degrees, an included angle of 0 degree is formed between the axes of the gas extraction drill hole and the impact treatment drill hole, the aperture of the gas extraction drill hole and the aperture of the impact treatment drill hole are 60-100 mm, the depth is 50-80 m, and the distance between the gas extraction drill hole and the interval between the impact treatment drill hole are 2-5 m, wherein, in the gas extraction drill holes and the impact treatment drill holes, three gas extraction drill holes and one impact treatment drill hole form an extraction operation group, the extraction operation group is uniformly distributed on the coal seam wall, three gas extraction drill holes in the extraction operation group are distributed in a triangular structure, the impact treatment drill holes are positioned in the triangular structure formed by the three gas extraction drill holes, the distances from the axis of the impact treatment drill hole to the axes of the three gas extraction drill holes are the same, a plurality of stamping pipes, pressure relief pipes and gas extraction pipes are arranged, wherein the gas extraction pipes are embedded in the gas extraction drill holes and are coaxially distributed with the gas extraction drill holes, one stamping pipe and one pressure relief pipe form an impact group, the impact group is embedded in the impact treatment drill holes, and each impact treatment drill hole is internally provided with an impact group, the impact groups and the impact processing drill holes are coaxially distributed, the gas extraction pipes and the impact groups are respectively connected with front end ports of the gas extraction drill holes and the impact processing drill holes through pressure self-adaptive bags, the drill holes are sealed by the pressure self-adaptive bags, the temperature sensors and the pressure sensors are respectively and uniformly distributed on the outer surfaces of the punch pipes and the pressure relief pipes of the impact groups, the gas flow meters are installed on the outer surfaces of the gas extraction pipes, the punch pipes are respectively and mutually communicated with the liquid nitrogen booster pumps and the high-pressure hot air blowers through gas guide pipes, the liquid nitrogen booster pumps are mutually communicated with a liquid nitrogen storage steel bottle, the high-pressure hot air blowers are mutually communicated with a nitrogen storage steel bottle, one end of each pressure relief pipe is embedded in the impact processing drill holes, the other end of each pressure relief pipe is located outside the impact processing drill holes, the pressure relief valves are arranged on the pressure relief pipes located outside the impact processing drill holes, the gas extraction pipes are mutually communicated with the gas extraction pumps, the liquid nitrogen storage steel bottle, the high-pressure pumps, the gas extraction pumps and the control circuits are respectively connected with the temperature control sensors, the gas storage pressure sensors, the gas storage steel bottle, the gas storage pressure gauges, the gas storage steel bottle and the gas storage hydraulic pressure sensors are respectively arranged on the bearing frame of the hot air blower and the high-pressure control mechanism;
the bearing frame comprises a base, a working panel, a lifting driving mechanism, a rotary table mechanism, at least two guide blocks and guide rails, wherein the base is of a frame structure with a rectangular cross section, the working panel is arranged right above the base through the lifting driving mechanism and is coaxially distributed with the base, the lifting driving mechanism is respectively vertically distributed with the base and the working panel, the tail end of the lifting driving mechanism is mutually connected with the base through the rotary table mechanism, the guide rails are arranged on the upper surface of the base and are distributed in an annular structure around the axis of the rotary table mechanism, the guide blocks are distributed on the lower surface of the working panel around the axis of the working panel, and the tail ends of the guide blocks are connected with the guide rails in a sliding manner;
the guide block comprises a telescopic rod, a guide wheel and a bearing spring, wherein the axis of the telescopic rod is hinged with the lower surface of the working panel and forms an included angle of 0-90 degrees, the guide wheel is connected with the front end of the telescopic rod through a wheel carrier, the guide wheel is embedded in the guide rail, the bearing spring is coated outside the telescopic rod, and the two ends of the bearing spring are respectively abutted against the lower surface of the working panel and the wheel carrier.
2. The hot-cold alternative coal-breaking permeability-increasing gas enhanced extraction system of claim 1, characterized in that: the liquid nitrogen storage steel cylinder and the nitrogen storage steel cylinder are at least one, and when the number of the liquid nitrogen storage steel cylinders and the number of the nitrogen storage steel cylinders are two or more, the liquid nitrogen storage steel cylinders and the nitrogen storage steel cylinders are connected in parallel.
3. The hot and cold alternative coal-breaking permeability-increasing gas enhanced extraction system according to claim 1, characterized in that: the punching pipe and the pressure relief pipe in the impact group are connected through at least two positioning hoops.
4. An extraction method of the hot-cold alternate coal-breaking permeability-increasing gas enhanced extraction system according to claim 1, characterized by comprising the following steps: the extraction method of the heat-cold alternative coal-breaking permeability-increasing gas enhanced extraction system comprises the following steps of:
firstly, drilling holes, namely, according to the requirements of design and mining operation, forming a plurality of gas extraction drill holes and a plurality of impact treatment drill holes on the side surface of the coal seam wall of an operation surface, wherein the axes of the gas extraction drill holes and the impact treatment drill holes form an included angle of 90 degrees with the front surface of the coal seam wall, the included angles between the axes of the gas extraction drill holes and the impact treatment drill holes are 0 degree, the apertures of the gas extraction drill holes and the impact treatment drill holes are 60-100 mm and the depth is 50-80 m, the distance between the gas extraction drill holes and the distance between the gas extraction drill holes and the impact treatment drill holes are 2-5 m, the three gas extraction drill holes and the one impact treatment drill holes form one gas extraction operation group, at least two gas extraction operation groups are uniformly distributed on the wall, the three gas extraction drill holes in the gas extraction operation group are distributed in a triangular structure, and the impact treatment drill holes are positioned in the triangular structure formed by the three gas extraction drill holes, and the distances between the axes of the impact treatment drill holes are the same;
secondly, prefabricating a drill hole, after the operation of the first step is finished, installing a gas extraction pipe into the gas extraction drill hole through a pressure self-adaptive bag, sealing the port of the gas extraction pipe by the pressure self-adaptive bag, installing an impact group into the impact treatment drill hole through the pressure self-adaptive bag, sealing the port of the impact treatment drill hole by the pressure self-adaptive bag, then communicating the gas extraction pipe with a gas extraction pump, communicating the impact pipe in the impact group with a high-pressure hot air blower and a liquid nitrogen booster pump through an air duct, finally communicating the high-pressure hot air blower and the liquid nitrogen booster pump with a liquid nitrogen storage steel cylinder and a nitrogen storage steel cylinder respectively, and electrically connecting a control circuit with each electrical device,
thirdly, circulating the impact permeability-increasing extraction operation, after the second step of operation is finished, firstly heating the nitrogen in the nitrogen storage steel cylinder to 200-300 ℃ by a high-pressure hot air blower, pressurizing to 2-5 MPa, then leading the nitrogen into an impact treatment drill hole through a punching pipe, injecting nitrogen into the impact treatment drill hole, simultaneously performing gas extraction on three gas extraction drill holes at the periphery of the impact treatment drill hole through a gas extraction pump, when the gas flow rate is reduced and stabilized to 0.003-0.009m3/min, the high-pressure hot air blower is closed, the operation of conveying high-temperature nitrogen to the impact treatment drilling hole is stopped, and simultaneously the liquid nitrogen in the liquid nitrogen storage steel cylinder is pressurized to 2-5 MPa by a liquid nitrogen booster pump and is conveyed into the impact treatment drill hole, cooling the impact treatment drill hole, injecting liquid nitrogen into the impact treatment drill hole, simultaneously performing gas extraction on three gas extraction drill holes at the periphery of the impact treatment drill hole through a gas extraction pump, and when the gas flow in the gas extraction drill hole is reduced and stabilized to 0.003-0.009m3/min, the liquid nitrogen booster pump is closed, thereby completing an impact anti-reflection cycle, and returning to the running state of the start-up pressure hot-air blower in the impact anti-reflection cycle after completing the impact anti-reflection cycle, thereby realizing that when gas extraction is carried out, performing cold and hot circulating impact permeability increasing operation on the impact treatment drill hole, finishing the cold and hot circulating impact permeability increasing operation on the impact treatment drill hole after the gas flow in the gas extraction drill hole is continuously reduced and stabilized to 0.003-0.009m3/min, when high-temperature nitrogen and liquid nitrogen are introduced into the impact treatment drill hole for operation, after the pressure in the impact treatment drill hole is larger than the set pressure of a pressure release valve on a pressure release pipe, the pressure of the high-temperature nitrogen in the impact treatment drill hole is released by the pressure release pipe.
5. The extraction method of the hot-cold alternative coal-breaking permeability-increasing gas enhanced extraction system according to claim 4, characterized by comprising the following steps: when the gas extraction drill holes and the impact treatment drill holes in the first step are simultaneously formed on two sides of the coal seam wall, the gas extraction drill holes and the impact treatment drill holes are distributed at intervals, and stubble pressing lengths of not less than 10m are arranged at the tail ends of the adjacent gas extraction drill holes and the adjacent impact treatment drill holes.
6. The extraction method of the hot and cold alternate coal breaking permeability-increasing gas enhanced extraction system according to claim 4, characterized by comprising the following steps: the total area of the coal seam wall covered by the extraction operation group in the first step is more than 90% of the area of the coal seam wall.
7. The extraction method of the hot and cold alternate coal breaking permeability-increasing gas enhanced extraction system according to claim 4, characterized by comprising the following steps: and the pressure of the pressure relief valve in the third step is set to be 5MPa.
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| CN107476794B (en) * | 2017-09-28 | 2019-05-07 | 徐州工程学院 | Note high temperature nitrogen increases the method for coal body gas permeability after a kind of liquid nitrogen gasification circulation |
| CN109854221B (en) * | 2019-03-08 | 2020-09-04 | 中国矿业大学 | Underground cooling and heating alternate working cycle fracturing and permeability increasing coal seam system and extraction method |
| CN112647909B (en) * | 2020-12-16 | 2022-06-14 | 华能煤炭技术研究有限公司 | Gas extraction system and method |
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| CN103016044B (en) * | 2012-11-27 | 2014-12-10 | 河南理工大学 | Comprehensive method of drilling, permeability increasing, repairing and gas-driven displacing of drill hole underground coal mine |
| CN204402550U (en) * | 2014-11-18 | 2015-06-17 | 山西潞安矿业(集团)有限责任公司 | A kind of hypotonic seam area pit shaft gas phase pressure break rapid uncovering coal device |
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