A method for enhanced gas extraction from a gas deposit based on natural wind power

Abstract

The application discloses a kind of based on natural wind power's enhanced gas mine extraction method, applied to cold and windy mining area, rely on the negative pressure difference of natural wind, the heat of mine water in gas-bearing layer is taken away by cold wind flow, mine water solidification and volume expansion occur, can greatly extrude and crush gas-bearing layer;After closing the cold air inlet, mine water gradually liquefies thawing under the condition of underground mine heat, the conversion of mine water solid-liquid state can improve the crushability of gas-bearing layer, and then enhance the reaming and imbibition effect of cold layer, which helps to enhance the mining of gas mine.

Description

Technical Field

[0001] This invention relates to an enhanced gas extraction method based on natural wind power, belonging to the field of gas extraction (coalbed methane, shale gas and natural gas) in cold, windy climates and with low permeability. Background Technology

[0002] With the rapid development of society, my country's demand for various mineral energy sources is increasing daily. Gas fields are an important energy source in my country. Exploration has shown that my country's existing reserves of coalbed methane, shale gas, and natural gas reach 36.8 trillion cubic meters, 0.37 trillion cubic meters, and 5.96 trillion cubic meters, respectively. The exploitation and utilization of gas fields will effectively alleviate my country's energy consumption structure and contribute to its social development. However, the difficulties and low efficiency of gas extraction in cold, windy environments severely restrict the promotion of gas extraction operations in my country. Therefore, there is an urgent need to develop an enhanced gas extraction method based on natural wind power to ensure the efficient exploitation and utilization of gas fields. Summary of the Invention

[0003] The purpose of this invention is to address the problems of difficult and inefficient gas extraction in cold climates with frequent strong winds by providing an enhanced gas extraction method based on natural wind power.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] An enhanced gas extraction method based on natural wind power, characterized by comprising the following steps:

[0006] a. Along the vertical direction, drilling rigs are used to construct vertical borehole one and vertical borehole two in the overlying layer and gas-bearing layer respectively. Vertical borehole one and vertical borehole two are 50 to 500 m apart, and the bottom of the borehole is located in the middle of the gas-bearing layer.

[0007] b. Taking the bottom of vertical borehole 1 and vertical borehole 2 as the center, drill strike borehole 1 and strike borehole 2 at both ends of the gas-bearing layer in the horizontal direction. Taking the two ends and the middle of strike borehole 1 and strike borehole 2 as the beginning and end, drill dip borehole 1, dip borehole 3 and dip borehole 2 at both ends of the gas-bearing layer.

[0008] c. Pass cooling pipe 1 through vertical borehole 1, directional borehole 1, inclined borehole 1, directional borehole 2 and vertical borehole 2. Pass cooling pipe 2 through vertical borehole 1, inclined borehole 2 and vertical borehole 2. Pass cooling pipe 3 through vertical borehole 1, directional borehole 1, inclined borehole 3, directional borehole 2 and vertical borehole 2. Use four-way connector 1 and four-way connector 2 to connect to the three cooling pipes located in vertical borehole 1 and vertical borehole 2 respectively. Then connect four-way connector 1 and four-way connector 2 to the air inlet pipe and the air return pipe respectively.

[0009] d. Connect the air inlet duct and the exhaust fan, the delivery pipe and the water press, the return air duct and the negative pressure unit, the display and control console and the four-way connector and the wind speed sensor. The other end of the delivery pipe is located in the vertical drill hole. The first plug is set on the air inlet duct and the delivery pipe, and the second plug is set on the return air duct. Both the first plug and the second plug are located in the upper cover layer. The return air duct is also connected to the fan through a connecting pipe between the second plug and the negative pressure unit.

[0010] f. Use plugging device one and plugging device two to plug vertical borehole one and vertical borehole two respectively;

[0011] g. Open the stop valve, and the water pump will pressurize the mine water into the construction borehole. Under the action of gravity, salt ions and the sealing effect of the plug, the mine water flows into each construction borehole and penetrates into the pores and fissures of the gas-bearing layer.

[0012] h. Turn on the negative pressure unit and the exhaust fan. When the cold air blows through the negative pressure unit, it generates negative pressure suction. At the same time, the cold air blows into the exhaust fan and is sent along the air inlet duct to cooling pipe one, cooling pipe two, and cooling pipe three, and then merges into the return air duct. The cold air carries away the heat of the mine water, causing it to solidify. As the heat dissipates continuously, the mine water that has penetrated deep into the gas-bearing layer also solidifies. The solidification of the mine water causes its volume to expand, which greatly compresses and breaks up the gas-bearing layer. When the airflow is large, the flow rate can be adjusted by adjusting the flow restrictor inside the four-way connector one to limit the airflow channel.

[0013] i. With the negative pressure device and ventilator closed, the mine water gradually liquefies and thaws under the warm conditions of the underground mine. The mine water soaks the cold air layer, and the expansion and contraction changes can improve the fragility of the gas-bearing layer, thereby enhancing its porosity and permeability.

[0014] j. Repeat steps h to i to further improve the fragmentation and permeability of the gas-bearing strata, thereby enhancing the gas extraction effect.

[0015] Furthermore, the walls of the air inlet pipe, return air pipe, and three cooling pipes have good thermal conductivity. The cold airflow carries away the heat of the mine water through the pipe walls, causing the mine water temperature to drop.

[0016] Furthermore, the diameter of the vertical borehole is larger than that of the directional borehole and the inclined borehole, and the diameter of the air inlet duct and the return air duct is larger than that of the cooling duct. A wind speed sensor is installed in the second cooling duct located in the inclined borehole, and in the third cooling duct and the first cooling duct located in the second directional borehole.

[0017] Furthermore, the exhaust fan is an arc-shaped pipe with a wide opening and a narrow bottom, which can effectively capture the cold airflow in high-altitude and cold regions. At the connection between the bottom of the exhaust fan and the vertical drill hole, a sealing rotating component is provided, which can automatically rotate the exhaust fan to face the incoming wind direction. The negative pressure device is a trumpet-shaped pipe with a wide opening and a narrow bottom, which can greatly increase the negative pressure difference between the negative pressure device and the exhaust fan.

[0018] Furthermore, when the vertical borehole one and vertical borehole two are in a non-horizontal mine, vertical borehole one and the induced draft fan are located at a low level, while vertical borehole two and the negative pressure device are located at a high level.

[0019] Furthermore, both the four-way connector one and the four-way connector two include four connecting pipes, which can evenly distribute and collect airflow. These include one connecting pipe at the upper end and three identical connecting pipes at the lower end. The interface diameter of the upper connecting pipe matches the inlet and return air ducts, respectively, while the interface diameter of the three lower connecting pipes matches the cooling ducts. The connecting pipes are connected to their corresponding ducts via compression fittings. The three lower connecting pipes of the four-way connector one are equipped with flow restrictors, with flow restrictor fitting one and flow restrictor fitting two at their two ends. The flow-limiting pipe is screwed into the three cooling pipes at the lower end through the thread on the outer end of the second flow-limiting pipe. Eight folding components and two hydraulic columns are connected between the two flow-limiting pipes. The folding components are composed of connecting columns at both ends and bending columns one and two in the middle. The three are hinged in sequence. The hinge points of the folding components are all facing the central axis of the flow limiter. The connecting ends of bending columns one and two have an inward bending structure, so that when subjected to compressive force, the bending columns bend inward at the hinge point. The connecting columns at both ends are welded to flow-limiting pipe one and flow-limiting pipe two, respectively.

[0020] Furthermore, a fixing ring is also provided at the connection between the flow-limiting pipe and the connecting column. The diameter of the two fixing rings matches the inner wall circle diameter formed by the eight connecting columns at both ends, and the length is slightly smaller than that of the connecting column. The lower walls of the connecting column, the first bending column, and the second bending column are respectively provided with adhesive areas. The outer wall of the circular tube-shaped elastic cloth sleeve is pasted on the adhesive areas of the eight folding components. The elastic cloth sleeve is located between the connecting column and the fixing ring. The flow limiter is connected to the display and control console through the built-in circuit. The display and control console controls the extension and retraction of the hydraulic column, which drives the folding components to bend inward. The elastic cloth sleeve adapts to the change, reducing the airflow channel and realizing the function of regulating the airflow.

[0021] Furthermore, all pipelines and devices under the gas field are resistant to high pressure, low temperature and acid salts.

[0022] Furthermore, the elastic sleeve is a round tube with good strength, elasticity and density, and the fixing ring is located inside the elastic sleeve and is spot welded to the connecting column.

[0023] Furthermore, the plugging device one and the plugging device two can be composed of a casing that matches the borehole diameter, a conventional grouting plugging device, or an airbag.

[0024] Beneficial effects

[0025] Because of the above-mentioned technical solution, the mine water contains a large number of ions, which can dissolve the minerals in the gas-bearing layer and thus achieve the effect of increasing permeability. This invention uses mine water as a rock stratum permeability enhancement material, and cleverly uses the natural cold air flow in high-altitude and cold regions as the cooling and solidification power of the mine water. At the same time, a flow restrictor is set in the pipeline to realize the function of regulating the air flow, which has a green and sustainable development effect. The solid-liquid conversion of the mine water, its expansion and contraction changes, improves the fragility and permeability of the cold gas layer, thereby enhancing the extraction of gas. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention.

[0027] Figure 2 This is a top view of the piping device of the present invention.

[0028] Figure 3 This is a schematic diagram of the structure of the four-way connectors one and two of the present invention.

[0029] Figure 4 This is a schematic diagram showing the structural changes of the flow regulator of the present invention.

[0030] Figure 5 This is a structural schematic diagram of the folding component of the present invention.

[0031] Figure 6 This is a schematic diagram illustrating the structural changes of the elastic fabric cover of the present invention.

[0032] In the diagram: 1. Overburden, 2. Gas-bearing layer, 3-1. Vertical borehole one, 3-2. Vertical borehole two, 4-1. Strike borehole one, 4-2. Strike borehole two, 5-1. Dip borehole one, 5-2. Dip borehole two, 5-3. Dip borehole three, 6-1. Inlet duct, 6-2. Return duct, 7-1. Cooling duct one, 7-2. Cooling duct two, 7-3. Cooling duct three, 8-1. Four-way connector one, 8-2. Four-way connector two, 9. Exhaust fan, 10. Delivery pipe, 11. Check valve, 12. 13. Water pump, 14. Negative pressure device, 15. Connecting pipe, 16. Fan, 16-1. Blocker 1, 16-2. Blocker 2, 17. Mine water, 18. Flow regulator, 18-1. Flow limiting fitting 1, 18-2. Flow limiting fitting 2, 18-3. Folding component, 18-31. Connecting column, 18-32. Bending column 1, 18-33. Bending column 2, 18-34. Adhesive area, 18-4. Hydraulic column, 18-5. Fixing ring, 18-6. Elastic cloth sleeve, 19. Wind speed sensor, 20. Display and control console. Detailed implementation method:

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0035] like Figures 1-6 As shown, the present invention provides an enhanced gas extraction method based on natural wind power, comprising the following steps:

[0036] a. Along the vertical direction, drilling rigs are used to construct vertical borehole 1 3-1 and vertical borehole 2 3-2 in the overlying layer 1 and the gas-bearing layer 2 respectively. Vertical borehole 1 3-1 and vertical borehole 2 3-2 are 50 to 500 m apart, and the bottom of the borehole is located in the middle of the gas-bearing layer 2.

[0037] b. Taking the bottom of vertical borehole 1-3-1 and vertical borehole 2-2 as the center, along both ends of the gas-bearing layer 2 in the horizontal direction, drill strike borehole 1-4-1 and strike borehole 2-4-2 respectively. Taking the two ends and the middle of strike borehole 1-4-1 and strike borehole 2-4-2 as the beginning and end, drill dip borehole 1-5-1, dip borehole 3-3 and dip borehole 2-5-2 respectively along the gas-bearing layer 2.

[0038] c. Pass cooling pipe 1 7-1 through vertical drill hole 1 3-1, directional drill hole 1 4-1, inclined drill hole 1 5-1, directional drill hole 2 4-2 and vertical drill hole 2 3-2. Pass cooling pipe 2 7-2 through vertical drill hole 1 3-1, inclined drill hole 2 5-2 and vertical drill hole 2 3-2. Pass cooling pipe 3 7-3 through vertical drill hole 1 3-1, directional drill hole 1 4-1, inclined drill hole 3 5-3, directional drill hole 2 4-2 and vertical drill hole 2 3-2. Use four-way connector 1 8-1 and four-way connector 2 8-2 to connect to the three cooling pipes located in vertical drill hole 1 3-1 and vertical drill hole 2 3-2 respectively. Then connect four-way connector 1 8-1 and four-way connector 2 8-2 to air inlet pipe 6-1 and air return pipe 6-2 respectively.

[0039] d. Connect the air inlet duct 6-1 to the induced draft fan 9, the delivery pipe 10 to the water press 12, the return air duct 6-2 to the negative pressure unit 13, the display and control console 20 to the four-way connector 8-1 and the wind speed sensor 19. The other end of the delivery pipe 10 is located in the vertical drill hole 3-1. The first blocker 16-1 is set on the air inlet duct 6-1 and the delivery pipe 10, and the second blocker 16-2 is set on the return air duct 6-2. Both the first blocker 16-1 and the second blocker 16-2 are located in the upper cover layer 1. The return air duct 6-2 is also connected to the fan 15 through the connecting pipe 14 between the second blocker 16-2 and the negative pressure unit 13.

[0040] f. Use plugger 16-1 and plugger 26-2 to plug vertical borehole 13-1 and vertical borehole 23-2 respectively;

[0041] g. Open the stop valve 11, and the water pump 12 will press the mine water 17 into the construction borehole. Under the action of gravity, salt ions and the sealing effect of the plug, the mine water 17 flows into each construction borehole and penetrates into the pores and fissures of the gas-bearing layer 2.

[0042] h. Turn on the negative pressure unit 13 and the exhaust fan 9. When the cold air blows through the negative pressure unit 13, it generates negative pressure suction. At the same time, the cold air blows into the exhaust fan 9 and is sent along the air inlet pipe 6-1 to the cooling pipe 7-1, cooling pipe 7-2, and cooling pipe 7-3 respectively, and then merges into the return air pipe 6-2. The cold air carries away the heat of the mine water, causing it to solidify. As the heat dissipates continuously, the mine water 17 that has penetrated into the gas-bearing layer 2 also solidifies. The solidification of the mine water 17 causes its volume to expand, which greatly compresses and breaks the gas-bearing layer 2. When the airflow is large, the flow rate can be adjusted by adjusting the flow restrictor inside the four-way connector 8-1 to limit the airflow channel.

[0043] i. With the negative pressure device 13 and the ventilator 9 closed, the mine water gradually liquefies and thaws under the warm conditions of the underground mine. The mine water soaks the cold air layer, and the expansion and contraction changes can improve the fragility of the gas-bearing layer 2, thereby enhancing its porosity expansion and permeability enhancement effect.

[0044] j. Repeat steps h to i to further improve the fragility and permeability of gas-bearing layer 2, thereby enhancing the gas extraction effect.

[0045] Furthermore, the walls of the air inlet pipe 6-1, the return air pipe 6-2, and the three cooling pipes have good thermal conductivity. The cold airflow carries away the heat of the mine water through the pipe walls, causing the mine water temperature to drop.

[0046] Furthermore, the diameter of the vertical borehole is larger than that of the directional borehole and the inclined borehole, and the diameter of the air inlet duct and the return air duct is larger than that of the cooling duct. A wind speed sensor 19 is installed in the cooling duct 2 located in the inclined borehole 2 5-2, the cooling duct 3 located in the directional borehole 2 4-2, and the cooling duct 1, respectively.

[0047] Furthermore, the exhaust fan 9 is an arc-shaped pipe with a wide opening and a narrow bottom, which can effectively capture the cold airflow in high-altitude and cold regions. At the connection between the bottom of the exhaust fan 9 and the vertical drill hole 3-1, a sealing rotating component is provided, which can automatically rotate the exhaust fan to face the incoming wind direction. The negative pressure device 13 is a trumpet-shaped pipe with a wide opening and a narrow bottom, which can greatly increase the negative pressure difference between the negative pressure device 13 and the exhaust fan 9.

[0048] Furthermore, when the vertical borehole 3-1 and vertical borehole 3-2 are in a non-horizontal mine, vertical borehole 3-1 and the induced draft fan 9 are located at a low horizontal position, while vertical borehole 3-2 and the negative pressure device 13 are located at a high horizontal position.

[0049] Furthermore, both the four-way connector 8-1 and the four-way connector 8-2 include four connecting pipes, capable of evenly distributing and converging airflow. Each includes one connecting pipe at the upper end and three identical connecting pipes at the lower end. The interface diameter of the upper connecting pipe matches the inlet air duct 6-1 and the return air duct 6-2, respectively, while the interface diameter of the three lower connecting pipes matches the cooling ducts. The connecting pipes are connected to their corresponding ducts via compression fittings. A flow restrictor 18 is installed within the three lower connecting pipes of the four-way connector 8-1. The two ends of the flow restrictor 18 are respectively a flow restrictor fitting 18-1 and a flow restrictor fitting 18-2. The flow restrictor 18 passes through the outer end of the flow restrictor fitting 18-2... The threads are screwed into the three cooling pipes at the lower end. Eight folding components 18-3 and two hydraulic columns 18-4 are connected between the two flow-limiting pipes. The folding component 18-3 is composed of connecting columns 18-31 at both ends and bending columns 18-32 and 18-33 in the middle. The three are hinged in sequence. The hinge points of the folding component 18-3 are all facing the central axis of the flow limiter 18. The connecting ends of bending columns 18-32 and 18-33 are provided with an inward bending structure, so that when subjected to compressive force, the bending columns bend inward at the hinge point. The connecting columns 18-31 at both ends are welded to flow-limiting pipe 18-1 and flow-limiting pipe 28-2, respectively.

[0050] Furthermore, a fixing ring 18-5 is also provided at the connection between the flow limiting pipe and the connecting column. The diameter of the two fixing rings 18-5 matches the inner wall circle diameter formed by the eight connecting columns 18-31 at both ends, and the length is slightly smaller than that of the connecting column 18-31. The lower walls of the connecting column 18-31, the first bending column 18-32, and the second bending column 18-33 are respectively provided with a pasting area. The outer wall of the round tube-shaped elastic cloth sleeve 18-6 is pasted on the pasting area of ​​the eight folding components 18-3. The elastic cloth sleeve 18-6 is located between the connecting column 18-31 and the fixing ring 18-5. The flow limiter 18 is connected to the display and control console 20 through the built-in circuit. The display and control console 20 controls the extension and retraction of the hydraulic column 18-4, which drives the folding components 18-3 to bend inward. The elastic cloth sleeve 18-6 adapts to the change, reducing the airflow channel and realizing the function of regulating the airflow.

[0051] Furthermore, all pipelines and devices under the gas field are resistant to high pressure, low temperature and acid salts.

[0052] Furthermore, the elastic sleeve 18-6 is a round tube with good strength, elasticity and density. The fixing ring 18-5 is located inside the elastic sleeve 18-6 and is spot welded to the connecting column 18-31.

[0053] Furthermore, the plugging device 16-1 and the plugging device 26-2 can be composed of a casing that matches the borehole diameter, a conventional grouting plugging device, or an airbag.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any equivalent structures or equivalent transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for enhanced gas extraction from a gas deposit based on natural wind power, characterized in that, Includes the following steps: a. Along the vertical direction, drilling rigs are used to construct vertical borehole 1 (3-1) and vertical borehole 2 (3-2) in the overlying layer (1) and the gas-bearing layer (2) respectively. Vertical borehole 1 (3-1) and vertical borehole 2 (3-2) are 50~500m apart, and the bottom of the borehole is located in the middle of the gas-bearing layer (2). b. Taking the bottom of vertical borehole 1 (3-1) and vertical borehole 2 (3-2) as the center, along the two ends of the gas-bearing layer (2) in the horizontal direction, drill strike borehole 1 (4-1) and strike borehole 2 (4-2) respectively. Taking the two ends and the middle of strike borehole 1 (4-1) and strike borehole 2 (4-2) as the beginning and end, drill dip borehole 1 (5-1), dip borehole 3 (5-3) and dip borehole 2 (5-2) respectively along the gas-bearing layer (2). c. Pass cooling pipe one (7-1) through vertical borehole one (3-1), directional borehole one (4-1), inclined borehole one (5-1), directional borehole two (4-2), and vertical borehole two (3-2). Pass cooling pipe two (7-2) through vertical borehole one (3-1), inclined borehole two (5-2), and vertical borehole two (3-2). Pass cooling pipe three (7-3) through vertical borehole one (3-1), directional borehole one (4-1), and vertical borehole two (3-2). -1) For inclined borehole 3 (5-3), directional borehole 2 (4-2) and vertical borehole 2 (3-2), use four-way connector 1 (8-1) and four-way connector 2 (8-2) to connect to the three cooling pipes located in vertical borehole 1 (3-1) and vertical borehole 2 (3-2) respectively. Then connect four-way connector 1 (8-1) and four-way connector 2 (8-2) to the air inlet pipe (6-1) and air return pipe (6-2) respectively. d. Connect the air inlet pipe (6-1) and the induced draft fan (9), the delivery pipe (10) and the water press (12), the return air pipe (6-2) and the negative pressure device (13), the display console (20) and the four-way connector (8-1) and the wind speed sensor (19). The other end of the delivery pipe (10) is located in the vertical drill hole (3-1). The first plug (16-1) is set on the air inlet pipe (6-1) and the delivery pipe (10). The second plug (16-2) is set on the return air pipe (6-2). Both the first plug (16-1) and the second plug (16-2) are located on the upper cover layer (1). The return air pipe (6-2) is also connected to the fan (15) through the connecting pipe (14) between the second plug (16-2) and the negative pressure device (13). f. Use plugging device one (16-1) and plugging device two (16-2) to plug vertical borehole one (3-1) and vertical borehole two (3-2) respectively; g. Open the stop valve (11), and the water pump (12) will press the mine water (17) into the construction borehole. Under the action of gravity, salt ions and the sealing of the plug, the mine water (17) flows into each construction borehole and penetrates into the pores and fissures of the gas-bearing layer (2). h. Turn on the negative pressure device (13) and the induced draft fan (9). When the cold air blows through the negative pressure device (13), it generates negative pressure suction. At the same time, the cold air blows into the induced draft fan (9) and is sent to the cooling pipe one (7-1), cooling pipe two (7-2), and cooling pipe three (7-3) along the air inlet pipe (6-1) respectively, and then merges into the return air pipe (6-2). The cold air carries away the heat of the mine water and causes it to solidify. As the heat dissipates continuously, the mine water (17) that penetrates into the gas-bearing layer (2) also solidifies. The solidification of the mine water (17) causes its volume to expand, which greatly squeezes and breaks the gas-bearing layer (2). When the airflow is large, the flow rate can be adjusted by adjusting the flow restrictor inside the four-way connector one (8-1) to limit the airflow channel. i. Close the negative pressure device (13) and the ventilator (9). Under the warm conditions of the underground mine, the mine water gradually liquefies and thaws. The mine water soaks the cold air layer. The expansion and contraction can improve the fragility of the gas-bearing layer (2) and thus enhance its pore-expanding and permeability-enhancing effect. j. Repeat steps h~i to further improve the fragmentation and permeability of the gas-bearing layer (2) and achieve the effect of strengthening gas extraction.

2. The enhanced gas extraction method based on natural wind power as described in claim 1, wherein the pipe walls of the air intake pipe (6-1), the return air pipe (6-2) and the three cooling pipes have good thermal conductivity, and the cold airflow carries away the heat of the mine water through the pipe walls, resulting in a drop in the mine water temperature.

3. The enhanced gas extraction method based on natural wind power according to claim 1, characterized in that, The diameter of the vertical borehole is larger than that of the directional borehole and the inclined borehole. The diameter of the air inlet duct and the return air duct is larger than that of the cooling duct. A wind speed sensor (19) is installed in the second cooling duct located in the inclined borehole (5-2), the third cooling duct located in the second directional borehole (4-2), and the first cooling duct.

4. The enhanced gas extraction method based on natural wind power according to claim 1, characterized in that, The blower (9) is an arc-shaped pipe with a large opening and a small bottom, which can capture the cold wind in high-altitude and cold regions very well. At the connection between the bottom of the blower (9) and the vertical drill hole (3-1), there is a sealing rotating component that can automatically rotate the blower so that it faces the incoming wind. The negative pressure device (13) is a trumpet-shaped pipe with a large opening and a small bottom, which can greatly increase the negative pressure difference between the negative pressure device (13) and the blower (9).

5. The enhanced gas extraction method based on natural wind power according to claim 1, characterized in that, When the vertical borehole 1 (3-1) and vertical borehole 2 (3-2) are in a non-horizontal mine, vertical borehole 1 (3-1) and the ventilator (9) are located at a low level, while vertical borehole 2 (3-2) and the negative pressure device (13) are located at a high level.

6. The enhanced gas extraction method based on natural wind power according to claim 1, characterized in that, Both the four-way connector 1 (8-1) and the four-way connector 2 (8-2) include four connecting pipes, which can evenly distribute and collect airflow. Each includes one connecting pipe at the upper end and three identical connecting pipes at the lower end. The interface diameter of the upper connecting pipe matches the inlet air duct (6-1) and the return air duct (6-2), respectively. The interface diameter of the three lower connecting pipes matches the cooling ducts, respectively. The connecting pipes are connected to their corresponding ducts via compression fittings. The three lower connecting pipes of the four-way connector 1 (8-1) are equipped with flow restrictors (18). The two ends of the flow restrictor (18) are flow restrictor fitting 1 (18-1) and flow restrictor fitting 2 (18-2), respectively. The flow restrictor (18) is screwed onto the threaded end of the flow restrictor fitting 2 (18-2). Inside the three cooling pipes at the bottom, there are eight folding components (18-3) and two hydraulic columns (18-4) connected between the two flow limiting pipes. The folding component (18-3) is composed of connecting columns (18-31) at both ends and bending column one (18-32) and bending column two (18-33) in the middle. The three are hinged in sequence. The hinge points of the folding component (18-3) are all facing the central axis of the flow limiter (18). The connecting ends of bending column one (18-32) and bending column two (18-33) are provided with an inward bending structure, so that when subjected to compressive force, the bending column bends inward at the hinge point. The connecting columns (18-31) at both ends are welded to flow limiting pipe one (18-1) and flow limiting pipe two (18-2) respectively.

7. The enhanced gas extraction method based on natural wind power according to claim 6, characterized in that, A retaining ring (18-5) is also provided at the connection between the flow-limiting pipe fitting and the connecting column. The diameter of the two retaining rings (18-5) matches the inner wall circle diameter formed by the eight connecting columns (18-31) at both ends, and the length is slightly smaller than that of the connecting column (18-31). The lower walls of the connecting column (18-31), the first bent column (18-32), and the second bent column (18-33) are respectively provided with adhesive areas. The outer wall of the circular tube-shaped elastic cloth sleeve (18-6) is pasted on the eight folded components. On the pasting area of ​​component (18-3), the elastic cloth sleeve (18-6) is located between the connecting column (18-31) and the fixing ring (18-5). The flow limiter (18) is connected to the display and control console (20) through the built-in circuit. The display and control console (20) controls the extension and retraction of the hydraulic column (18-4) to drive the folding component (18-3) to bend inward. The elastic cloth sleeve (18-6) makes an adaptive change, reducing the airflow channel and realizing the function of regulating the airflow.

8. The enhanced gas extraction method based on natural wind power as described in claim 1, characterized in that, All pipelines and equipment in the gas field are resistant to high pressure, low temperature and acid salts.

9. The enhanced gas extraction method based on natural wind power as described in claim 7, characterized in that, The elastic sleeve (18-6) is a round tube with good strength, elasticity and density. The fixing ring (18-5) is located inside the elastic sleeve (18-6) and is spot welded to the connecting column (18-31).

10. The enhanced gas extraction method based on natural wind power as described in claim 1, characterized in that, The plugging device one (16-1) and the plugging device two (16-2) are composed of a casing or a conventional grouting plugging device or an airbag that matches the borehole diameter.

Images