Method for exploiting a gas deposit with a thick reservoir

Abstract

The application discloses a kind of thick storage layer gas mine mining methods, by excavating three-dimensional borehole and multiple with three-dimensional borehole vertical horizontal borehole, using perforating equipment in the internal horizontal borehole in the direction perpendicular to horizontal borehole storage layer cuts out multiple cracks, forms multiple crack zones, crack coupling between horizontal borehole forms crack through zone, while multiple groups of pre-set perforator are arranged in horizontal borehole to carry out segmented fracturing and increase surrounding rock permeability, and combined with electromagnetic recyclable gas extraction borehole plugging device carries out gas extraction.The application uses the way of multiple horizontal stratification-segmented fracturing and increases seepage to strengthen the mining of thick storage layer gas mine, prolongs gas mine extraction time and the service life of borehole, improves the gas permeability of gas storage layer and gas mine extraction efficiency.The application also solves the problems of traditional bag sealing not strict and extraction device not recyclable by setting electromagnetic sealing bag, and provides a new idea for the mining of thick storage layer gas mine.

Description

Technical Field

[0001] This invention relates to the field of gas extraction from low-permeability, dense rock formations, and thick reservoirs (coalbed methane, shale gas, and natural gas), and particularly to a method for extracting gas from thick reservoirs. Background Technology

[0002] With the rapid development of society, the demand for various mineral energy resources is increasing day by day. Therefore, there is an urgent need to develop a new method for gas field extraction that is conducive to the extraction and utilization of gas reserves. Summary of the Invention

[0003] The purpose of this invention is to address the problems of difficult and inefficient gas extraction from thick gas reservoirs by providing a method for extracting gas from thick reservoirs.

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

[0005] This invention provides an electromagnetic recyclable gas extraction borehole sealing device, characterized in that it comprises: an electromagnetic sealing bag, a grouting protection device, a suction pipe, a material injection pipe, and a power supply line. The electromagnetic sealing bag is composed of an outer bag and an inner magnetic ring structure. The outer bag includes a long, thin bag in the middle and short, thick bags on both sides. The inner magnetic ring is composed of magnetic ring one, magnetic ring two, magnetic ring three, a locking body, and an elastic cloth bag connected together, and its structure matches the structure of the outer bag. It includes a magnetic structure one in the middle and magnetic structures two on both sides. Magnetic structure one includes magnetic ring two at both ends of the long, thin bag and two magnetic ring three symmetrically arranged at a certain distance from magnetic ring two. Magnetic structure two includes magnetic ring three located at the short, thick bags respectively. The bag contains magnetic rings 2 and 1 on both sides, and a locking body located in the middle of magnetic rings 2 and 1. Magnetic rings 2 at both ends of the long, thin bag are integrally set close to magnetic rings 2 on both sides of the short, thick bag. Each magnetic ring and locking body is connected by an elastic cloth bag. When energized, the magnetism of magnetic ring 2 is opposite to that of magnetic ring 1 and 3. The internal magnetic ring structure is sleeved on the suction pipe, and the inner diameter of each magnetic ring and locking body is slightly larger than the outer diameter of the suction pipe. Magnetic ring 1 and 2 can slide on the suction pipe, while magnetic ring 3 and the locking body are fixed on the suction pipe. The grouting isolation device is sleeved on the outside of the electromagnetic sealing bag and wraps around the grouting pipe, providing isolation and protection for the electromagnetic sealing bag. The electromagnetic sealing bag is connected to the power supply line.

[0006] Furthermore, the magnetic ring body one and the magnetic ring body two are respectively provided with a circular ring fastening device for connecting and fastening the ports of the long thin bag and the short thick bag respectively.

[0007] Furthermore, the magnetic ring body and the locking body are provided with threads on the inner side, and threads are also provided at the corresponding positions on the outer side of the extraction tube. The magnetic ring body and the locking body are fixed on the extraction tube by thread matching.

[0008] Furthermore, the inner side of the magnetic ring body and the card slot body is divided into four symmetrical areas, one set of opposite areas is smooth, and the other set of opposite areas is threaded. The corresponding position on the outside of the extraction tube is also set with threads in the same way.

[0009] Furthermore, the short, thick bladder is equipped with a wireless smart valve, which can be remotely controlled to open and close via a wireless control device, thereby releasing the high-pressure energy from the short, thick bladder and facilitating the removal of the device.

[0010] Furthermore, the structure of the grouting isolation device matches the structure of the electromagnetic sealing bag, and consists of an isolation tube, an isolation bag one, an isolation bag two, a closing elastic band one, a closing elastic band two, a semi-circular clamp tube one, a semi-circular clamp tube two, and a long magnetic plate. The isolation tube consists of two semi-circular tubes located in the middle area of ​​the grouting isolation device, with its two ends connected to the isolation bag one and the isolation bag two, respectively. The outer ends of the isolation bag one and the isolation bag two are fitted with the closing elastic band one, and the inner ends are fitted with the closing elastic band. Second, the first elastic band can wrap the outer end of the protective bag around the air extraction pipe to prevent the protective bag from folding and falling off when the device touches the coal wall during drilling. The second elastic band can wrap the inner end of the protective bag around the protective pipe. The two ends of the semi-circular clamps are equipped with oppositely shaped long magnetic plates, which attract each other to firmly clamp the inner end of the protective bag onto the protective pipe. The joint of the two semi-circular pipes is provided with a tight-fitting groove to ensure the tightness of the protective pipe joint.

[0011] Furthermore, the length of the protective tube matches the length between the two magnetic rings, and is used to fit the portion between the two magnetic rings on the long, thin bag. The protective bag one and the protective bag two have the same structure, both consisting of the portion fitted with the short, thick bag and the portion fitted between the magnetic rings two and three on the long, thin bag.

[0012] Furthermore, the first protective bag is provided with a hole for the injection tube to pass through. After the injection tube passes through the first protective bag, it is fastened to the first protective bag by a spring clip.

[0013] Furthermore, the spring clip body is composed of a spring body, a clip body tube wall, and a core. The core is fixed at the bottom center of the clip body tube wall, and the spring body is wrapped around the core. Its two wings extend to the top of the clip body tube wall. The inner wall of the clip body tube wall is circular, with the same diameter as the outer wall of the injection tube. The upper arc surface of its outer wall is consistent with the arc surface of the inner wall of the drill hole, and the lower arc surface can achieve maximum contact area with the short, thick, drum-shaped bag, thereby ensuring good sealing of the short, thick bag to the drill hole. The spring body is located inside the clip body tube wall. After the spring clip body opens, its two wings close around the core under the elastic force of the spring clip body. All the edges and corners of the spring clip body are blunted to avoid damage to other devices.

[0014] The present invention also provides a method for exploiting thick reservoir gas fields using the above-mentioned electromagnetic recyclable gas extraction borehole sealing device, characterized by comprising the following steps:

[0015] a. Using drilling equipment, drill a group of boreholes in the gas reservoir. The three-dimensional boreholes penetrate the cover layer and the gas reservoir. Horizontal boreholes one, two, and three follow the direction of the gas reservoir and are drilled perpendicular to the three-dimensional boreholes. The horizontal boreholes are spaced 5 to 7 meters apart.

[0016] b. Inside the three horizontal boreholes, use perforation equipment to cut multiple fractures in the gas reservoir perpendicular to the direction of the horizontal boreholes, forming multiple fracture zones. The fractures between the horizontal boreholes are coupled to form a fracture penetration zone. Multiple sets of pre-installed perforators are set at a distance of 5 to 6 meters in the depth of the horizontal boreholes.

[0017] c. Assemble the electromagnetic recyclable gas extraction borehole sealing device. Pass the extraction pipe through the magnetic rings and locking bodies of the electromagnetic sealing bag, making the threaded surface of the extraction pipe match the threaded surfaces of the magnetic rings and locking bodies, thereby securing the magnetic rings and locking bodies to the extraction pipe. Then, the electromagnetic sealing bag is secured to the extraction pipe. Pass the injection pipe through the first isolation bag, and then insert the spring clamp into the first isolation bag, securing the injection pipe to the first isolation bag with the spring clamp. Then, wrap the grouting isolation device with the spring clamp and injection pipe around the electromagnetic sealing bag, so that the injection pipe opening is located in the grout sealing area. Connect the power supply line and the electromagnetic sealing bag, and send the extraction pipe with the electromagnetic sealing bag and grouting isolation device into the three-dimensional borehole.

[0018] The specific operation involves wrapping the grouting isolation device with spring clips and injection pipes onto the electromagnetic sealing bag. Specifically, two semi-circular tubes are joined together, and the part between the two magnetic rings of the long, thin bag is wrapped in the middle to form an isolation tube. Isolation bags one and two with spring clips and injection pipes are passed through the short, thick bag, and the closing elastic bands one and two are wrapped around the air extraction pipe and the opening of the isolation tube, respectively. At the same time, the inner ports of isolation bags one and two are reinforced on the isolation tube using semi-circular clamps one and two.

[0019] d. Connect the circuit. The two side bags of the electromagnetic plugging bag change from a long strip shape to a round bulge shape, closely adhering to the hole wall, and forming a sealing zone in the middle. Start the pump tank, and the plugging material is transported to the sealing zone through the injection pipe.

[0020] e. After the plugging material has seeped into the surrounding rock wall and solidified, gas extraction can be carried out.

[0021] f. When a significant decrease in the concentration of gas extracted is detected, the wireless control console is used to remotely activate the pre-set perforators in the same column of three horizontal boreholes to generate new fractures in the horizontal boreholes, and then gas extraction is carried out.

[0022] g. Repeat step f to enhance the exploitation of thick reservoir gas fields;

[0023] h. Once the gas extraction in this section is complete, the high-pressure energy of the two bags on both sides of the electromagnetic sealing bag is discharged from the wireless control console, causing the volume to expand and contract. The circuit connection is then disconnected, and the magnetic rings lose their mutual attraction. Under the tension of the electromagnetic sealing bag itself, the magnetic rings move apart, causing the long, thin bag and the short, thick bag to return to their original shape. The extraction pipe containing the electromagnetic sealing bag is then removed, completing the recovery of the thick reservoir gas extraction device.

[0024] Furthermore, the pre-set perforator is equipped with a spring device in the middle and needle-tip structures at both ends, which can be deeply inserted into the upper and lower rock walls of the horizontal borehole under the action of elastic force. The ultra-wireless control console can remotely start the pre-set perforator.

[0025] Beneficial effects

[0026] Compared with existing technologies, this invention employs multi-level stratified-segmented fracturing to enhance the extraction of thick gas reservoirs. Segmented fracturing extends the gas extraction time and borehole lifespan. Multi-level stratified fracturing creates fracture coupling zones, improving the permeability of the gas reservoir and the gas extraction efficiency. Furthermore, this invention cleverly combines traditional bag sealing and grouting sealing using electromagnetic principles. This overcomes the problem of inadequate bag sealing leading to low extraction efficiency, and also solves the problem of non-recyclable sealing and extraction devices due to grouting sealing. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the sealing device of the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of the electromagnetic sealing bag of the present invention.

[0030] Figure 4 This is a schematic diagram of the grouting isolation device of the present invention before and after being powered on.

[0031] Figure 5 This is a schematic diagram of the structure of the spring clip body of the present invention.

[0032] Figure 6 This is a schematic diagram showing the effect of the device of the present invention before and after power-on and material injection.

[0033] Figure 7 This is a schematic diagram of the magnetic ring body or the locking body of the present invention being fixed to the extraction tube.

[0034] Figure 8 This is a flowchart of the installation process of the grouting isolation device of the present invention.

[0035] In the diagram: 1. Cover layer, 2. Gas storage layer, 3. Three-dimensional borehole, 4. Horizontal borehole one, 5. Horizontal borehole two, 6. Horizontal borehole three, 7. Pre-installed perforator, 8. Ejection pipe, 9. Electromagnetic sealing bag, 9-1. Long and thin bag, 9-2. Short and thick bag, 9-3. Magnetic ring one, 9-4. Magnetic ring two, 9-5. Magnetic ring three, 9-6. Locking body, 9-7. Intelligent valve, 9-8. Elastic cloth bag, 10. Grouting isolation device, 10-1. 10-2. Isolation bag 1, 10-3. Isolation bag 2, 10-4. Closing elastic band 1, 10-5. Closing elastic band 2, 10-6. Semi-circular clamp 1, 10-7. Semi-circular clamp 2, 10-8. Long magnetic plate, 11. Injection pipe, 12. Blockage, 13. Pump tank, 14. Power supply line, 15. Spring clip body, 15-1. Spring body, 15-2. Clip body wall, 15-3. Core, 16. Ultra-wireless control console, 17. Thread. Detailed implementation method:

[0036] 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.

[0037] 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.

[0038] Example 1

[0039] like Figures 1-8 As shown, this invention provides an electromagnetic recyclable gas extraction borehole sealing device, comprising: an electromagnetic sealing bag 9, a grouting protection device 10, an extraction pipe 8, a material injection pipe 11, and a power supply line 14. The electromagnetic sealing bag 9 is composed of an outer bag and an inner magnetic ring structure. The outer bag includes a long, thin bag 9-1 located in the middle and short, thick bags 9-2 located on both sides. The inner magnetic ring is composed of magnetic ring 1 9-3, magnetic ring 2 9-4, magnetic ring 3 9-5, a locking body 9-6, and an elastic cloth bag 9-8 connected together. Its structure matches the structure of the outer bag, including a magnetic structure 1 located in the middle and magnetic structures 2 located on both sides. Magnetic structure 1 includes magnetic ring 2 9-4 located at both ends of the long, thin bag and two magnetic ring 3 9-5 symmetrically arranged at a certain distance from magnetic ring 2 9-4. Magnetic structure 2 includes... The magnetic rings 9-4 and 9-3 are located on both sides of the short, thick bag, and the locking body 9-6 is located in the middle of the magnetic rings 9-4 and 9-3. The magnetic rings 9-4 at both ends of the long, thin bag are integrally formed with the magnetic rings 9-4 on both sides of the short, thick bag. The magnetic rings and locking bodies 9-6 are connected by an elastic cloth bag 9-9. When energized, the magnetism of the magnetic ring 9-4 is similar to that of the magnetic ring 9-3. 3. The magnetic properties of magnetic ring 9-5 are opposite, causing magnetic ring 9-3 to move towards magnetic ring 9-4, while magnetic ring 9-4 moves towards magnetic ring 9-5. This causes the long, thin bag 9-1 and the short, thick bag 9-2 to become rounded and bulging, thus sealing the protective tube 10-1 and the borehole. The locking body 9-6 is used to prevent magnetic ring 9-3, which is affected by the magnetic force, from moving further towards magnetic ring 9-4.

[0040] The internal magnetic ring structure is sleeved on the air extraction pipe 8, and the inner diameter of each magnetic ring and the locking body 9-6 is slightly larger than the outer diameter of the air extraction pipe 8. Magnetic ring one 9-3 and magnetic ring two 9-4 can slide on the air extraction pipe 8, and magnetic ring three 9-5 and locking body 9-6 are fixed on the air extraction pipe 8. The grouting isolation device 10 is sleeved on the outside of the electromagnetic sealing bag 9, and the injection pipe 11 is wrapped on it, which plays a role in isolating and protecting the electromagnetic sealing bag 9. The electromagnetic sealing bag 9 is connected to the power supply line 14.

[0041] Furthermore, the magnetic ring body 9-3 and the magnetic ring body 9-4 are respectively provided with a circular ring fastening device for connecting and fastening the ports of the long thin bag and the short thick bag respectively.

[0042] Furthermore, the magnetic ring body 9-5 and the locking body 9-6 are provided with threads 17 on their inner sides, and threads 17 are also provided at the corresponding positions on the outer side of the air extraction pipe 8. The magnetic ring body 9-5 and the locking body 9-6 are fixed on the air extraction pipe 8 through thread matching.

[0043] Furthermore, the inner sides of the magnetic ring body 9-5 and the card slot body 9-6 are divided into four symmetrical regions, one set of opposite regions is smooth, and the other set of opposite regions is threaded. The corresponding positions on the outer side of the air extraction pipe are also threaded in the same way.

[0044] Furthermore, the short, thick bladder is equipped with a wireless smart valve 9-7, which can be remotely controlled to open and close via a wireless control console 16, thereby releasing the high-pressure energy from the short, thick bladder and facilitating the removal of the device.

[0045] Furthermore, the structure of the grouting isolation device matches the structure of the electromagnetic sealing bag 9, and consists of an isolation tube 10-1, an isolation bag one 10-2, an isolation bag two 10-3, a closing elastic band one 10-4, a closing elastic band two 10-5, a semi-circular clamp tube one 10-6, a semi-circular clamp tube two 10-7, and a long magnetic plate 10-8. The isolation tube 10-1 consists of two semi-circular tubes, which are located in the middle area of ​​the grouting isolation device 10, and its two ends are respectively connected to the isolation bag one 10-1 and the isolation bag two 10-2. The outer ends of the isolation bag one and the isolation bag two are fitted with the closing elastic band one 10-4. The inner end is fitted with a second elastic band 10-5. The first elastic band 10-4 can wrap the outer end of the protective bag around the air extraction pipe 8 to prevent the protective bag from folding and falling off when the device touches the coal wall during drilling. The second elastic band 10-5 can fit the inner end of the protective bag onto the protective pipe 10-1. The two ends of the semi-circular clamp pipe 10-6 and the second semi-circular clamp pipe 10-7 are provided with oppositely shaped long magnetic plates 10-8, which attract each other to firmly clamp the inner end of the protective bag onto the protective pipe 10-1. The joint of the two semi-circular pipes is provided with a tight-fitting groove to ensure the tightness of the protective pipe joint.

[0046] Furthermore, the length of the protective tube 10-1 matches the length between the two magnetic rings 9-5, and is used to fit the part between the two magnetic rings on the long thin bag. The protective bag 10-2 and the protective bag 2 10-3 have the same structure, both consisting of the part fitted with the short thick bag and the part fitted between the magnetic rings 2 and 3 of the long thin bag.

[0047] Furthermore, the protective bag 10-2 is provided with a hole for the injection tube 11 to pass through. After the injection tube 11 passes through the protective bag 10-2, it is fastened to the protective bag 10-2 by the spring clip 15.

[0048] Furthermore, the spring clip 15 is composed of a spring body 15-1, a clip tube wall 15-2, and a core 15-3. The core 15-3 is fixed at the bottom center of the clip tube wall 15-2. The spring body 15-1 is wrapped around the core, and its two wings extend to the top of the clip tube wall 15-2. The inner wall of the clip tube wall 15-2 is circular, with the same diameter as the outer wall of the injection tube. The upper arc surface of its outer wall is consistent with the arc surface of the inner wall of the drill hole, and the lower arc surface can achieve maximum contact area with the short, thick, drum-shaped bag, thereby ensuring good sealing of the short, thick bag to the drill hole. The spring body 15-1 is located inside the clip tube wall 15-2. After the spring clip 15 is opened, its two wings close around the core under the elastic force of the spring clip 15. All the edges and corners of the spring clip 15 are blunted to avoid damage to other devices.

[0049] Example 2

[0050] Embodiment 2 of the present invention provides a method for exploiting thick reservoir gas fields using the electromagnetic recyclable gas extraction borehole sealing device of Embodiment 1, comprising the following steps:

[0051] a. Using drilling equipment, drill a group of holes in the gas reservoir. The three-dimensional borehole 3 penetrates the cover layer 1 and the gas reservoir 2. The horizontal boreholes 1, 2, 5 and 3 follow the direction of the gas reservoir 2 and are drilled perpendicular to the three-dimensional borehole 3. The horizontal boreholes are spaced 5 to 7 meters apart.

[0052] b. Inside the three horizontal boreholes, multiple fractures are cut in the gas reservoir 2 perpendicular to the direction of the horizontal boreholes using perforation equipment, forming multiple fracture zones. The fractures between the horizontal boreholes are coupled to form a fracture penetration zone. Multiple sets of pre-installed perforators 7 are set at a distance of 5 to 6 meters in the depth of the horizontal boreholes.

[0053] c. Assemble the electromagnetic recyclable gas extraction borehole sealing device. Pass the extraction pipe 8 through the magnetic rings and locking bodies of the electromagnetic sealing bag, ensuring that the threaded surface of the extraction pipe 3 matches the threaded surfaces of the magnetic ring 9-5 and locking body 9-6, thus securing the magnetic ring 9-5 and locking body 9-6 to the extraction pipe 8. Then, secure the electromagnetic sealing bag to the extraction pipe 8. Pass the injection pipe 11 through the protective bag 10-2, and then attach the spring locking body. 15 is inserted into the grouting bag 10-2, and the injection pipe 11 is fastened to the grouting bag 10-2 by the spring clip 15; then the grouting grouting device 10 with the spring clip and injection pipe is wrapped around the electromagnetic sealing bag, so that the injection pipe opening is located in the grout sealing area, the power supply line 14 is connected to the electromagnetic sealing bag 9, and the air extraction pipe 8 with the electromagnetic sealing bag 9 and the grouting grouting device 10 is sent into the three-dimensional borehole 3;

[0054] Specifically, the grouting isolation device 10, which includes a spring clip 15 and an injection pipe 11, is wrapped around an electromagnetic sealing bag. The operation is as follows: two semi-circular tubes are joined together, and the part between the two magnetic rings 9-5 of the long, thin bag is wrapped in the middle to form an isolation tube 10-1. Isolation bags 10-2 and 10-3, which include spring clips and injection pipes, are passed through the short, thick bag 9-2. The closing elastic bands 10-4 and 10-5 are wrapped around the air extraction pipe 8 and the opening of the isolation tube 10-1, respectively. At the same time, the inner ends of isolation bags 10-2 and 10-3 are reinforced to the isolation tube 10-1 using semi-circular clamps 10-6 and 10-7.

[0055] d. Connect the circuit. The two side bags of the electromagnetic plugging bag 9 change from long strips to round bulges, closely adhering to the hole wall, forming a sealing and airtight area in the middle. Start the pump tank, and the plugging material 12 is transported to the sealing and airtight area through the injection pipe.

[0056] e. After the plugging material 12 has seeped into the surrounding rock wall and solidified, gas extraction can be carried out.

[0057] f. When a significant decrease in the concentration of gas extracted is detected, the wireless control console 16 is operated to remotely activate the pre-set perforators 7 in the same column of three horizontal boreholes to generate new fractures in the horizontal boreholes, and then gas extraction is carried out.

[0058] g. Repeat step f to enhance the exploitation of thick reservoir gas fields;

[0059] h. Once the gas extraction in this section is complete, the high-pressure energy of the two bags on both sides of the electromagnetic sealing bag 9 is discharged by the wireless control console 16, causing the volume to shrink and the circuit connection to be disconnected. The magnetic rings lose their mutual attraction and, under the tension of the electromagnetic sealing bag 9 itself, the magnetic rings move apart, causing the long thin bag and the short thick bag to return to their original shape. The extraction pipe 8 containing the electromagnetic sealing bag is then removed, completing the recovery of the thick reservoir gas extraction device.

[0060] Furthermore, the pre-set perforator 7 is equipped with a spring device in the middle and needle-tip structures at both ends, which can be deeply inserted into the upper and lower rock walls of the horizontal borehole under the action of elastic force. The ultra-wireless control console can remotely start the pre-set perforator.

[0061] 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 exploiting gas from thick reservoirs, characterized in that, Includes the following steps: a. Using drilling equipment, drill a group of boreholes in the gas reservoir. The three-dimensional boreholes penetrate the cover layer and the gas reservoir. Horizontal boreholes one, two, and three follow the direction of the gas reservoir and are drilled perpendicular to the three-dimensional boreholes. The horizontal boreholes are spaced 5 to 7 meters apart. b. Inside the three horizontal boreholes, use perforation equipment to cut multiple fractures in the gas reservoir perpendicular to the direction of the horizontal boreholes, forming multiple fracture zones. The fractures between the horizontal boreholes are coupled to form a fracture penetration zone. Multiple sets of pre-installed perforators are set at a distance of 5 to 6 meters in the depth of the horizontal boreholes. c. Assemble the electromagnetic recyclable gas extraction borehole sealing device. When passing the extraction pipe through the electromagnetic sealing bag, match the threaded surface of the extraction pipe with the threaded surface of the magnetic ring body and the locking body, so that the magnetic ring body and the locking body are fixed to the extraction pipe. Then, the electromagnetic sealing bag is fixed on the extraction pipe. Pass the injection pipe through the first isolation bag, and then send the spring clip into the first isolation bag. The spring clip is used to fix the injection pipe to the first isolation bag. Then, wrap the grouting isolation device with the spring clip and injection pipe around the electromagnetic sealing bag, so that the injection pipe opening is located in the grout sealing area. Connect the power supply line and the electromagnetic sealing bag, and send the extraction pipe with the electromagnetic sealing bag and grouting isolation device into the three-dimensional borehole. The specific operation involves wrapping the grouting isolation device with spring clips and injection pipes onto the electromagnetic sealing bag. Specifically, two semi-circular tubes are joined together, and the part between the two magnetic rings of the long, thin bag is wrapped in the middle to form an isolation tube. Isolation bag one and isolation bag two with spring clips and injection pipes are passed through the short, thick bag respectively. A set of closing elastic bands is wrapped around the air extraction pipe, and a set of closing elastic bands is wrapped around the opening of the isolation tube. At the same time, the inner ports of isolation bag one and isolation bag two are reinforced to the isolation tube using semi-circular clamps one and two. The electromagnetic occlusion bag is composed of an outer bag and an inner magnetic ring structure. The outer bag includes a long, thin bag in the middle and short, thick bags on both sides. The inner magnetic ring structure includes a magnet structure one in the middle and magnet structures two on both sides. Magnet structure one includes magnet structures two at both ends of the long, thin bag and two magnet structures three symmetrically arranged at a certain distance from magnet structures two. Magnet structure two includes magnet structures two and magnet structures one on both sides of the short, thick bags, and a locking body in the middle of magnet structures two and magnet structures one. After being energized, the magnetism of magnet structures two is opposite to that of magnet structures one and magnet structures three. d. Connect the circuit. The two side bags of the electromagnetic plugging bag change from long strips to round drums, closely adhering to the hole wall, forming a sealing zone in the middle. Start the pump tank, and the plugging material is transported to the sealing zone through the injection pipe. e. After the plugging material has seeped into the surrounding rock wall and solidified, gas extraction can be carried out. f. When a significant decrease in the concentration of gas extracted is detected, the wireless control console is used to remotely activate the pre-set perforators in the same column of three horizontal boreholes to generate new fractures in the horizontal boreholes, and then gas extraction is carried out. g. Repeat step f to enhance the exploitation of thick reservoir gas fields.

2. The method for exploiting thick reservoir gas fields according to claim 1, characterized in that, The pre-set perforator is equipped with a spring device in the middle and needle-tip structures at both ends, which can be deeply inserted into the upper and lower rock walls of the horizontal borehole under the action of elastic force. The ultra-wireless control console can remotely start the pre-set perforator.

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