An integrated multiple sealing device based on phase transformation and a method of use

Abstract

The application discloses a kind of based on phase conversion integrated multiple sealing device and use method, device includes the plug-pump integrated device of adaptive isolation device, can complete the accurate hole operation of adaptive isolation device.It abandons traditional cement slurry hole sealing, uses the solid-liquid two-phase state transformation of mine water, carries out drilling plugging and gas mine extraction.Under the control of main console, power station is connected into cold gas source to heat conversion pipe, so that sealing mine water solidification, complete drilling plugging;When gas mine extraction concentration reduces, recover cold gas source, after mine water liquefaction, re-water filling sealing area and solidification, complete secondary hole sealing, realize the secondary extraction of gas mine, such as cyclic operation, can realize multiple hole sealing operation, improve the service life of drilling and the extraction efficiency of gas mine.In addition, plug-pump integrated device can realize the recovery and reuse of hole sealing device and gas mine extraction device, with good application prospect.

Description

Technical Field

[0001] This invention relates to an integrated multi-sealing device and its usage method based on phase transformation, belonging to the fields of engineering borehole sealing and gas field extraction. Background Technology

[0002] Gas fields, including coalbed methane, natural gas, and shale gas, are important strategic energy sources for my country. Accelerating the extraction and utilization of gas fields has always been a key measure for my country to alleviate its energy crisis. However, gas extraction alters the stress distribution of the reservoir, causing the expansion of fractures around the extraction borehole and the formation of new fracture channels. This leads to leakage problems with traditional single-seal sealing, resulting in decreased gas extraction concentration and shortened borehole lifespan. Furthermore, current technologies often only allow for single-seal sealing and cannot perform multiple seals, further affecting borehole lifespan and consequently impacting gas extraction efficiency.

[0003] Therefore, in order to solve the above problems, an integrated multi-stage sealing device and method based on phase transformation is provided to meet the needs of engineering borehole sealing and gas field extraction. Summary of the Invention

[0004] The purpose of this invention is to address the problem of one-time sealing by providing an integrated multi-sealing device and method based on phase transformation.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] An integrated multi-stage sealing device based on phase transformation is characterized by comprising an integrated plugging and pumping device, a water injection pipe I, a water injection pipe II, a water injection pipe III, a pre-pumping pipe, and a water suction and injection device. The integrated plugging and pumping device consists of injection and pumping pipes, a heat conversion pipe, an adaptive sealing device I, an adaptive sealing device II, pipe I, pipe II, a power station, and a main control unit. The heat conversion pipe is located on the outer surface of the middle section of the injection and pumping pipes. Control switches are located at the upper parts of the injection and pumping pipes at both ends of the heat conversion pipe. The control switches are connected to pipe II located on the upper side of the injection and pumping pipe. Adaptive sealing devices I and II are respectively located on the injection and pumping pipes outside the control switches. A water passage hole is located at the lower part of each injection and pumping pipe inside the adaptive sealing device. This water passage hole is connected to the water passage hole located on the lower part of the injection and pumping pipe. The first and second side pipes are connected. The other ends of the first and second pipes are connected to the first and second water injection pipes respectively through the first and second joints on the injection and extraction pipes. The first and second water injection pipes are connected to the third water injection pipe through a three-way valve. The third water injection pipe is connected to the water suction and injection device. The pre-extraction pipe is connected to the third joint on the injection and extraction pipe. The left end of the injection and extraction pipe is connected to a power station. The upper part of the power station is the main control console. The first and second adaptive sealing devices are composed of a circular connecting piece fixed to the outer wall of the injection and extraction pipe, a circular sliding piece slidably set on the outer wall of the circular connecting piece, and an elastic sealing bag housed inside the circular sliding piece. The adaptive sealing device is connected to the main control console through a line. The main control console can complete the isolation and sealing operations by adjusting the integrated blocking and extraction device.

[0007] Furthermore, the annular connector has a sliding groove in the shape of a spatial trapezoid on the left and right sides of the annular space parallel to the horizontal central axis. The annular slider has two trapezoidal sliding clips on the left and right sides of its inner wall, parallel to the horizontal central axis, that match the sliding grooves. The elastic packing bag is fixedly connected around the inner ring of the annular slider to be stored in the inner and outer ring spaces. The outer ring of the annular slider has an annular through hole to allow the bag to be released from inside the annular slider. The annular connector also has a semi-circular arched channel in the bottom annular space for the telescopic tube to extend and retract. One end of the telescopic tube is connected to the pipe through the water passage of the injection pipe, and the other end passes through the slider and communicates with the elastic packing bag.

[0008] Furthermore, a sealing element is provided at the connection between the telescopic tube and the elastic septum bag. The sealing element is fixed to one end of the telescopic tube and its shape matches the semi-circular arched channel. A hydraulic telescopic column is provided at the end of the sliding groove away from the telescopic tube. The other end of the hydraulic telescopic column is connected to the sliding clip, which can drive the sliding clip to slide left and right in the sliding groove under the control of the main control panel.

[0009] Furthermore, the two side walls of the elastic septum extend into the inner and outer ring spaces of the annular sliding member, and are stacked in a layered structure by pressure rods set in the inner and outer ring spaces. The pressure rods are symmetrically distributed on both sides adjacent to and parallel to the annular through hole, with four on one side. The upper end of the pressure rod is an arc-shaped thick wall fixed to the inner wall of the outer ring of the annular sliding member. Each of the four ends of the arc-shaped thick wall is connected to a long rod. The middle and lower part of the long rod is connected to a spring. The end of the long rod is connected to a roller group formed by multiple rollers connected at intervals by an arc-shaped connecting member. The roller group presses the outer surface of the two side walls of the elastic septum.

[0010] Furthermore, the heat conversion pipe is formed by multiple turns of the pipe around the injection and extraction pipe. The pipes at both ends are inserted into the injection and extraction pipe to form an injection pipe and a return pipe, respectively. The injection pipe and the return pipe extend outwards within the injection and extraction pipe and connect to the storage tank, air compressor, and recovery tank in the power station. A temperature sensor is installed on the return pipe located in the blockage area. The outer ends of the injection pipe and the return pipe are wrapped with insulation sleeves. The main control console controls the power station to complete the injection and discharge of cold air sources, thereby completing the refrigeration operation.

[0011] Furthermore, the components of the injection and extraction pipes, pipe one, pipe two, heat conversion pipe, and adaptive sealing device all have the characteristics of high pressure resistance, high and low temperature resistance, and corrosion resistance, and the water injection device, water injection pipe one, water injection pipe two, and water injection pipe three have the characteristics of corrosion resistance.

[0012] Furthermore, the detector is mounted on the outer wall of the annular sliding member, and can monitor and transmit the position information of the first and second blocking holes, and transmit the information back to the main control console.

[0013] Furthermore, a check valve is also provided on the pre-extraction pipe.

[0014] This invention provides a method for using the integrated multi-sealing device based on phase transformation as described above, characterized by comprising the following steps:

[0015] a. Insert the integrated plugging and extraction device into the pre-extraction hole;

[0016] b. Connect connector one and water injection pipe one, connector two and water injection pipe two, connector three and pre-extraction pipe on the plugging and pumping integrated device respectively, and connect water injection pipe three and water suction device;

[0017] c. Connect the downhole power supply, the detector transmits the position of plugging hole one and plugging hole two, the main control console controls adaptive sealing device one and adaptive sealing device two to perform position calibration, the hydraulic telescopic column drives the sliding clamp to slide in the sliding groove in the annular connector, thereby driving the annular sliding component to move, so that the annular through hole is directly opposite plugging hole one and plugging hole two.

[0018] d. Start the water injection device, open the three-way valve to connect the water injection pipe three and the water injection pipe one. The water injection device will draw mine water into the elastic sealing bag through the pipe one and the telescopic pipe. When the mine water fills the bag, the folded bag inside the annular sliding part will be pulled up, which will drive the roller group under the pressure rod to rotate, ensuring that the elastic sealing bag inflates in an orderly manner and is released from the inside of the annular sliding part into the sealing hole.

[0019] e. When the water injection volume tends to stabilize, close the three-way valve and the water injection device to stop water injection. At this time, the elastic sealing bag is filled with the sealing hole, and the sealing operation is completed.

[0020] f. Operate the main control panel to turn on the control switch, open the three-way valve, connect water injection pipe two and water injection pipe three, and then start the water injection device to pressurize the mine water into the sealing area through pipe two and the control switch;

[0021] g. Once the water injection volume stabilizes, the main control panel closes the control switch and starts the power station for cooling operations. The pressurized gas tank injects cold air into the heat conversion tube through the injection pipe, where it exchanges heat with the mine water outside the heat conversion tube, causing it to solidify. When the temperature sensor detects that the cold air source temperature is higher than a certain temperature, the recovery gas tank is opened to recover the gas source. At the same time, the pressurized gas tank injects new cold air until the cold air source is refreshed. The injection and refresh of the cold air source is repeated until the gas extraction operation is completed. The mine water is rich in various salts and sulfate ions, which can dissolve the minerals in the gas storage rock layer, achieving the effect of expanding the pores and increasing permeability. This allows the mine water to penetrate deeper into the gas storage layer. At the same time, the cooling and solidification of the mine water can freeze a larger area of ​​the gas storage layer and make it a dense whole.

[0022] h. When the temperature sensor temperature slowly decreases, open the check valve to start gas extraction operation;

[0023] i. When the gas concentration in the gas field decreases significantly, the main control console starts the power station. The air compressor pump pressurizes the cold air source in the injection pipe and return pipe into the recovery gas tank. After the solid mine water loses its cold source, it slowly melts into liquid under the influence of the mine temperature.

[0024] j. Repeat steps d and e to fill the elastic packing bag with sufficient mine water, and re-seal the disc holes whose shape has changed after gas extraction. This solves the problem of stress redistribution in the gas reservoir and the impact of disc hole shape changes on sealing quality.

[0025] k. Repeat step f to inject more mine water into the sealing area, causing the mine water to fill the new fractures and channels created by the gas reservoir;

[0026] l. Repeat steps g to h to carry out new borehole plugging and gas extraction operations;

[0027] m. After multiple sealing and extraction operations are completed, the gas content in the gas reservoir will decrease significantly. At this time, operate the main control panel, turn on the air compressor and recovery gas tank to discharge the cold air source in the pipeline. When the mine water is liquefied again, open the three-way valve to connect the water injection device and the elastic packing bag. Use the water injection device to perform negative pressure water injection to empty the water filling in the elastic packing bag. As the elastic packing bag retracts, the sealing area is connected to the outside of the pre-extraction hole, and the mine water in the sealing area flows out. Finally, disconnect the integrated sealing and extraction device from the water injection pipe 1, water injection pipe 2 and pre-extraction pipe, and retrieve the integrated sealing and extraction device.

[0028] Beneficial effects

[0029] By adopting the above-mentioned technical solution, this invention abandons the traditional method of sealing boreholes with cement slurry and uses the solid-liquid two-phase transformation of mine water to seal boreholes in gas extraction. The use of mine water can avoid the impact of solid cement slurry sealing on coal mining operations. Secondly, the use of an adaptive sealing device can achieve precise sealing operations. In addition, the integrated sealing and extraction device can realize the recycling and reuse of the sealing device and the gas extraction device. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the integrated plugging and pumping device of the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of the device of the present invention.

[0032] Figure 3 This is a structural diagram of the connection between the adaptive sealing device one and two and the integrated plugging and pumping device.

[0033] Figure 4 This is a schematic diagram of the internal structure of the annular connector.

[0034] Figure 5 This is a structural diagram of the telescopic tube, sealing grid, and channel.

[0035] Figure 6 This is a schematic diagram of the water injection sealing channel and the water injection sealing drilling channel of the device of the present invention.

[0036] Figure 7 This is a cross-sectional view of the adaptive packer and injection / extraction pipeline.

[0037] Figure 8 This is a schematic diagram showing the distribution of the pressure rod within the sliding component.

[0038] Figure 9 This is a cross-sectional schematic diagram of a circular sliding component.

[0039] Figure 10This is a schematic diagram of the structure of the pressure bar stacking on the elastic septum bag and a schematic diagram of the pressure bar structure.

[0040] Figure 11 This is a schematic diagram of the connection structure between the trapezoidal sliding groove and the sliding card body.

[0041] In the diagram: 1. Gas storage layer, 2. Pre-extraction hole, 3-1. Plugging hole one, 3-2. Plugging hole two, 4. Integrated ploughing and plugging device, 4-1. Injection and extraction pipeline, 4-2. Heat conversion pipe, 4-21. Insulation jacket, 4-31. Adaptive packing device one, 4-32. Adaptive packing device two, 4-41. Pipeline one, 4-42. Pipeline two, 4-5. Power station, 4-51. Pressurized gas tank, 4-52. Compressed air pump, 4-53. Recovered gas tank, 4-6. Main control panel, 4-71. Connector one, 4-72. Connector two, 4- 73. Connector 3, 5-1. Water Injection Pipe 1, 5-2. Water Injection Pipe 2, 5-3. Water Injection Pipe 3, 6. Pre-extraction Pipe, 7-1. Three-way Valve, 7-2. Check Valve, 8. Water Suction and Injection Device, 9. Mine Water, 10-1. Circular Connector, 10-2. Sliding Groove, 10-3. Circular Sliding Part, 10-4. Sliding Clamp, 10-5. Elastic Sealing Bag, 10-6. Telescopic Pipe, 10-7. Circular Through Hole, 10-8. Pressure Rod, 10-9. Detector, 10-10. Hydraulic Telescopic Column, 10-11. Seal. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] Example 1

[0045] like Figures 1-11As shown, this invention provides an integrated multi-stage sealing device based on phase transformation, comprising an integrated plugging and pumping device 4, a water injection pipe 1 5-1, a water injection pipe 2 5-2, a water injection pipe 3 5-3, a pre-pumping pipe 6, and a water suction and injection device 8. The integrated plugging and pumping device 4 is composed of an injection and pumping pipe 4-1, a heat conversion pipe 4-2, an adaptive sealing device 1 4-31, an adaptive sealing device 2 4-32, a pipe 1 4-41, a pipe 2 4-42, a power station 4-5, and a main control unit 4-6. The heat conversion pipe 4-2 is equipped with... A control switch is located on the outer surface of the middle part of the injection / extraction pipe 4-1. The control switch is connected to a second pipe 4-42 located inside the upper part of the injection / extraction pipe 4-1. An adaptive sealing device 4-31 and an adaptive sealing device 4-32 are respectively installed on the injection / extraction pipe 4-1 outside the control switch. A water passage hole is located at the lower part of each injection / extraction pipe 4-1 inside the adaptive sealing device. This water passage hole communicates with the first pipe 4-41 located inside the lower part of the injection / extraction pipe 4-1. The other ends of pipe 4-41 and pipe 4-42 are connected to water injection pipe 5-1 and water injection pipe 5-2 respectively via connectors 4-71 and 4-72 on injection pipe 4-1. Water injection pipe 5-1 and water injection pipe 5-2 are connected to water injection pipe 5-3 via three-way valve 7-1. Water injection pipe 5-3 is connected to water suction device 8. Pre-extraction pipe 6 is connected to connector 4-73 on injection pipe 4-1. The left end of injection pipe 4-1 is connected to power station 4-5. The upper part of power station 4-5 is the main control unit. The adaptive sealing device 4-31 and the adaptive sealing device 4-32 are composed of an annular connector 10-1 fixed to the outer wall of the injection / extraction pipe 4-1, an annular sliding member 10-3 slidably disposed on the outer wall of the annular connector 10-1, and an elastic sealing bag 10-5 housed inside the annular sliding member 10-3. The adaptive sealing device is connected to the main control console 4-6 through a line. The main control console 4-6 can complete the isolation and sealing operations by adjusting the integrated plugging / extraction device 4.

[0046] Furthermore, the annular connector 10-1 has sliding grooves 10-2 in the shape of spatial trapezoids on the left and right sides of the annular space parallel to the horizontal central axis. The annular slider 10-3 has two trapezoidal sliding clips 10-4 on the left and right sides of its inner wall parallel to the horizontal central axis, which match the sliding grooves 10-2. The elastic septum 10-5 is fixedly connected around the inner ring of the annular slider 10-3 so as to be stored in the inner and outer ring space. The annular slider 10-3 has an annular through hole 10-7 at the corresponding position on the outer ring so as to allow the septum to be released from the inside of the annular slider 10-3. The annular connector 10-1 also has a semi-circular arched channel in the bottom annular space for the telescopic tube 10-6 to move telescopically. One end of the telescopic tube 10-6 is connected to the pipe 4-41 through the water passage of the injection pipe 4-1, and the other end passes through the slider 10-3 and communicates with the elastic septum 10-5.

[0047] Furthermore, a sealing element 10-11 is provided at the connection between the telescopic tube 10-6 and the elastic sealing bag 10-5. The sealing element 10-11 is fixedly connected to one end of the telescopic tube 10-6, and its shape matches the semi-circular arched channel. A hydraulic telescopic column 10-10 is provided at one end of the sliding groove 10-2 away from the telescopic tube 10-6. The other end of the hydraulic telescopic column 10-10 is connected to the sliding clamp 10-4, which can drive the sliding clamp 10-4 to slide left and right in the sliding groove 10-2 under the control of the main control panel 4-6.

[0048] Furthermore, the two side walls of the elastic septum 10-5 extend into the inner and outer ring spaces of the annular sliding member 10-3, and are stacked in a layered structure by the pressure rods 10-8 set in the inner and outer ring spaces. The pressure rods 10-8 are symmetrically distributed on both sides adjacent to and parallel to the annular through hole 10-7, with 4 on one side. The upper end of the pressure rod 10-8 is a thick arc wall fixed to the inner wall of the outer ring of the annular sliding member 10-3. Each of the four ends of the thick arc wall is connected to a long rod. The middle and lower part of the long rod is connected to a spring. The end of the long rod is connected to a roller group formed by multiple rollers connected at intervals by an arc connecting member. The roller group presses the outer surface of the two side walls of the elastic septum 10-5.

[0049] Furthermore, the heat conversion pipe 4-2 is formed by multiple turns of pipes around the injection and extraction pipe 4-1. The pipes at both ends are inserted into the injection and extraction pipe 4-1 to form an injection pipe and a return pipe, respectively. The injection pipe and the return pipe extend outwards from the injection and extraction pipe 4-1 and connect to the pressurized gas tank 4-51, the air compressor 4-52, and the recovery gas tank 4-53 in the power station 4-5. A temperature sensor is installed on the return pipe located in the blockage area. The outer ends of the injection pipe and the return pipe are wrapped with insulation sleeves 4-21. The main control console 4-6 controls the power station 4-5 to complete the injection and discharge of cold air sources, thereby completing the refrigeration operation.

[0050] Furthermore, the components of the injection and extraction pipe 4-1, pipe one 4-41, pipe two 4-42, heat conversion pipe 4-2, and adaptive sealing device all have the characteristics of high pressure resistance, high and low temperature resistance, and corrosion resistance. The water injection device 8, water injection pipe one 5-1, water injection pipe two 5-2, and water injection pipe three 5-3 have the characteristics of corrosion resistance.

[0051] Furthermore, the detector 10-9 is mounted on the outer wall of the sliding member 10-3, and can monitor and transmit the position information of the first blocking hole 3-1 and the second blocking hole 3-2, and transmit the information back to the main control console 4-6.

[0052] Furthermore, a check valve 7-2 is also provided on the pre-extraction pipe 6.

[0053] Example 2

[0054] This invention provides a method of using the integrated multi-sealing device based on phase transformation as described above, comprising the following steps:

[0055] a. Insert the integrated plugging and extraction device 4 into the pre-extraction hole 2;

[0056] b. Connect connector 4-71 and water injection pipe 5-1, connector 4-72 and water injection pipe 5-2, connector 4-73 and pre-extraction pipe 6 to the plugging and pumping integrated device 4 respectively, and connect water injection pipe 5-3 and water suction device 8.

[0057] c. Connect the downhole power supply. The detector 10-9 transmits the positions of the first plug hole 3-1 and the second plug hole 3-2. The main control console 4-6 controls the adaptive packer 1 4-31 and the adaptive packer 2 4-32 to perform position calibration. The hydraulic telescopic column 10-10 drives the sliding clamp 10-4 to slide in the sliding groove 10-2 in the annular connector 10-1, which in turn drives the annular sliding member 10-3 to move, so that the annular through hole 10-7 is directly aligned with the first plug hole 3-1 and the second plug hole 3-2.

[0058] d. Start the water injection device 8, open the three-way valve 7-1 to connect the water injection pipe 3 5-3 and the water injection pipe 1 5-1. The water injection device 8 will introduce mine water 9 into the elastic sealing bag 10-5 through the pipe 1 4-41 and the telescopic pipe 10-6. Under the filling of mine water, the bag folded inside the annular sliding member 10-3 will be pulled up, which will drive the roller group under the pressure rod 10-8 to rotate, ensuring that the elastic sealing bag 10-5 inflates in an orderly manner and is released from the inside of the annular sliding member 10-3 into the sealing hole.

[0059] e. When the water injection volume tends to stabilize, close the three-way valve 7-1 and the water injection device 8 to stop water injection. At this time, the elastic sealing bag 10-5 is filled with the sealing hole, and the sealing operation is completed.

[0060] f. Operate the main control panel 4-6 to turn on the control switch, open the three-way valve 7-1, connect the water injection pipe 2 5-2 and the water injection pipe 3 5-3, and then start the water injection device 8 to press the mine water 9 into the sealing area through the pipe 2 4-42 and the control switch;

[0061] g. When the water injection volume tends to stabilize, after the main control panel 4-6 turns off the control switch, the power station 4-5 is started to carry out the cooling operation. The pressurized gas tank 4-51 injects cold air into the heat conversion tube 4-2 through the gas injection pipe, and exchanges heat with the mine water 9 outside the heat conversion tube 4-2 to solidify it. When the temperature sensor detects that the temperature of the cold air source is higher than a certain temperature, the recovery gas tank 4-53 is opened to recover the gas source. At the same time, the pressurized gas tank 4-51 injects new cold air until the cold air source is updated. The injection and updating of the cold air source is repeated until the gas extraction operation is completed. The mine water 9 is rich in various salts and sulfate ions, which can dissolve the minerals in the gas storage rock layer, achieve the effect of expanding the pores and increasing the permeability, and thus allow the mine water to penetrate deeper into the gas storage layer 1. At the same time, the cooling and solidification of the mine water 9 can freeze a larger area of ​​the gas storage layer 1 and make it into a dense whole.

[0062] h. When the temperature sensor temperature slowly decreases, open the check valve 7-2 to carry out gas extraction operations.

[0063] i. When the gas concentration drops significantly, the main control console 4-6 starts the power station 4-5, and the air compressor 4-52 pressurizes the cold air source in the gas injection pipe and return pipe into the recovery gas tank 4-53. After the solid mine water loses its cold source, it slowly melts into liquid under the influence of the mine temperature.

[0064] j. Repeat steps d and e to fill the elastic packing bag with sufficient mine water by 10-5, and re-seal the disc holes whose shape has changed after gas extraction. This solves the problem of stress redistribution in the gas reservoir and the impact of disc hole shape change on sealing quality.

[0065] k. Repeat step f to inject more mine water 9 into the sealing area, causing the mine water to fill the new fractures and new channels generated by the gas reservoir 1;

[0066] l. Repeat steps g to h to carry out new borehole plugging and gas extraction operations;

[0067] m. After multiple sealing and extraction operations are completed, the gas content in the gas reservoir 1 will decrease significantly. At this time, operate the main control panel 4-6, turn on the air compressor 4-52 and the recovery gas tank 4-53 to discharge the cold air source in the pipeline. When the mine water 9 is liquefied again, open the three-way valve 7-1 to connect the water injection device 8 and the elastic sealing bag 10-5. Use the water injection device 8 to perform negative pressure water injection operation to drain the filling water in the elastic sealing bag 10-5. As the elastic sealing bag 10-5 retracts, the sealing area is connected to the outside of the pre-extraction hole 2, and the mine water 9 in the sealing area flows out. Finally, disconnect the integrated sealing and extraction device 4 from the water injection pipe 1 5-1, the water injection pipe 2 5-2 and the pre-extraction pipe 6, and retrieve the integrated sealing and extraction device 4.

[0068] 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. An integrated multi-stage sealing device based on phase transformation, characterized in that, The device includes an integrated plugging and pumping device (4), a water injection pipe 1 (5-1), a water injection pipe 2 (5-2), a water injection pipe 3 (5-3), a pre-pumping pipe (6), and a water suction and injection device (8). The integrated plugging and pumping device (4) consists of an injection and pumping pipe (4-1), a heat conversion pipe (4-2), an adaptive sealing device 1 (4-31), an adaptive sealing device 2 (4-32), a pipe 1 (4-41), a pipe 2 (4-42), a power station (4-5), and a main control console (4-6). The heat conversion pipe (4-2) is located on the outer surface of the middle part of the injection and pumping pipe (4-1). The injection and extraction pipes (4-1) at both ends are equipped with control switches at their upper parts. The control switches are connected to pipe two (4-42) located inside the upper side of the injection and extraction pipe (4-1). Adaptive sealing device one (4-31) and adaptive sealing device two (4-32) are respectively installed on the injection and extraction pipe (4-1) outside the control switches. Each injection and extraction pipe (4-1) inside the adaptive sealing device has a water passage hole at its lower part. This water passage hole is connected to pipe one (4-41) located inside the lower side of the injection and extraction pipe (4-1). Pipe one (4-41) and pipe two (4-42) are further... One end is connected to water injection pipe 1 (5-1) and water injection pipe 2 (5-2) respectively through connector 1 (4-71) and connector 2 (4-72) on the injection and extraction pipe (4-1). Water injection pipe 1 (5-1) and water injection pipe 2 (5-2) are connected to water injection pipe 3 (5-3) through a three-way valve (7-1). Water injection pipe 3 (5-3) is connected to the water suction and injection device (8). The pre-extraction pipe (6) is connected to connector 3 (4-73) on the injection and extraction pipe (4-1). The left end of the injection and extraction pipe (4-1) is connected to the power station (4-5). The upper part of the power station (4-5) is the main control console. 4-6), the adaptive sealing device one (4-31) and the adaptive sealing device two (4-32) are composed of an annular connector (10-1) fixed to the outer wall of the injection and extraction pipe (4-1), an annular sliding member (10-3) slidably disposed on the outer wall of the annular connector (10-1), and an elastic sealing bag (10-5) housed inside the annular sliding member (10-3). The adaptive sealing device is connected to the main control console (4-6) through a line. The main control console (4-6) can complete the isolation operation and sealing operation by adjusting the integrated blocking and extraction device (4). The annular connector (10-1) has trapezoidal sliding grooves (10-2) on its left and right sides, parallel to the horizontal central axis, within annular spaces. The annular slider (10-3) has two trapezoidal sliding clips (10-4) on its inner wall, parallel to the horizontal central axis, matching the sliding grooves (10-2). The elastic sealing bag (10-5) is fixedly connected around the inner ring of the annular slider (10-3) to be housed within the inner and outer annular spaces. An annular through hole (10-7) is opened at the corresponding position of the outer ring of the sliding member (10-3) to allow the bag to be released from the inside of the annular sliding member (10-3). The annular connector (10-1) is also provided with a semi-circular arched channel in its bottom annular space for the telescopic tube (10-6) to telescopically move. One end of the telescopic tube (10-6) is connected to the first pipe (4-41) through the water passage of the injection pipe (4-1), and the other end passes through the sliding member (10-3) and communicates with the elastic sealing bag (10-5).

2. The integrated multi-stage sealing device based on phase transformation according to claim 1, characterized in that, A sealing element (10-11) is provided at the connection between the telescopic tube (10-6) and the elastic sealing bag (10-5). The sealing element (10-11) is fixed to one end of the telescopic tube (10-6) and its shape matches the semi-circular arched channel. A hydraulic telescopic column (10-10) is provided at one end of the sliding groove (10-2) away from the telescopic tube (10-6). The other end of the hydraulic telescopic column (10-10) is connected to the sliding clamp (10-4), which can drive the sliding clamp (10-4) to slide left and right in the sliding groove (10-2) under the control of the main control panel (4-6).

3. The integrated multi-stage sealing device based on phase transformation according to claim 1, characterized in that, The two side walls of the elastic septum (10-5) extend into the inner and outer ring spaces of the annular sliding member (10-3), and are stacked in a layered structure by pressure rods (10-8) set in the inner and outer ring spaces. The pressure rods (10-8) are symmetrically distributed on both sides adjacent to and parallel to the annular through hole (10-7), with 4 on one side. The upper end of the pressure rod (10-8) is a thick arc wall fixed to the inner wall of the outer ring of the annular sliding member (10-3). Each of the four ends of the thick arc wall is connected to a long rod. A spring is connected to the middle of the long rod. The end of the long rod is connected to a roller group formed by multiple rollers connected at intervals by an arc connecting member. The roller group presses the outer surface of the two side walls of the elastic septum (10-5).

4. The integrated multi-stage sealing device based on phase transformation according to claim 1, characterized in that, The heat conversion pipe (4-2) is formed by multiple turns of the pipe around the injection pipe (4-1). The pipes at both ends are inserted into the injection pipe (4-1) to form an injection pipe and a return pipe. The injection pipe and the return pipe extend outward in the injection pipe (4-1) and are connected to the pressurized gas tank (4-51), the air compressor (4-52), and the recovery gas tank (4-53) in the power station (4-5). A temperature sensor is installed on the return pipe located in the blockage area. The outer ends of the injection pipe and the return pipe are wrapped with an insulation sleeve (4-21). The main control console (4-6) controls the power station (4-5) to complete the injection and discharge of cold air source, thereby completing the refrigeration operation.

5. The integrated multi-stage sealing device based on phase transformation according to claim 1, characterized in that, The components of the injection and extraction pipe (4-1), pipe one (4-41), pipe two (4-42), heat conversion pipe (4-2), and adaptive sealing device all have the characteristics of high pressure resistance, high and low temperature resistance, and corrosion resistance. The water injection device (8), water injection pipe one (5-1), water injection pipe two (5-2), and water injection pipe three (5-3) have the characteristics of corrosion resistance.

6. The integrated multi-stage sealing device based on phase transformation according to claim 1, characterized in that, The detector (10-9) is installed on the outer tube wall of the sliding member (10-3) and can monitor and transmit the position information of the first blocking hole (3-1) and the second blocking hole (3-2) and transmit the information back to the main control console (4-6).

7. The integrated multi-stage sealing device based on phase transformation according to claim 1, characterized in that, The pre-extraction pipe (6) is also equipped with a stop valve (7-2).

8. A method of using an integrated multi-stage sealing device based on phase transformation according to any one of claims 1-7, characterized in that, Includes the following steps: a. Insert the plugging and pumping integrated device (4) into the pre-pumping hole (2); b. Connect the connector one (4-71) and water injection pipe one (5-1), connector two (4-72) and water injection pipe two (5-2), connector three (4-73) and pre-extraction pipe (6) on the plugging and pumping integrated device (4) respectively, and connect water injection pipe three (5-3) and water suction device (8). c. Connect the downhole power supply. The detector (10-9) transmits the positions of plugging hole one (3-1) and plugging hole two (3-2). The main control console (4-6) controls the adaptive packer one (4-31) and adaptive packer two (4-32) to perform position calibration. The hydraulic telescopic column (10-10) drives the sliding clamp (10-4) to slide in the sliding groove (10-2) in the annular connector (10-1), which in turn drives the annular sliding member (10-3) to move, so that the annular through hole (10-7) is directly opposite plugging hole one (3-1) and plugging hole two (3-2). d. Start the water injection device (8), open the three-way valve (7-1) to connect the water injection pipe three (5-3) and the water injection pipe one (5-1). The water injection device (8) will bring the mine water (9) into the elastic sealing bag (10-5) through the pipe one (4-41) and the telescopic pipe (10-6). Under the filling of mine water, the bag folded in the annular sliding part (10-3) will be pulled up, which will drive the roller group under the pressure rod (10-8) to rotate, ensuring that the elastic sealing bag (10-5) expands in an orderly manner and is released from the inside of the annular sliding part (10-3) into the sealing hole. e. When the water injection volume tends to stabilize, close the three-way valve (7-1) and the water injection device (8) to stop water injection. At this time, the elastic sealing bag (10-5) is filled with the sealing hole, and the sealing operation is completed. f. Operate the main control panel (4-6) to turn on the control switch, open the three-way valve (7-1), connect water injection pipe two (5-2) and water injection pipe three (5-3), and then start the water injection device (8) to press the mine water (9) into the sealing area through pipe two (4-42) and the control switch; g. When the water injection volume tends to be stable, the main control panel (4-6) closes the control switch and starts the power station (4-5) to carry out the cooling operation. The pressure tank (4-51) pressurizes the cold air source into the heat conversion tube (4-2) through the gas injection pipe, and exchanges heat with the mine water (9) outside the heat conversion tube (4-2) to solidify it. When the temperature sensor detects that the temperature of the cold air source is higher than a certain temperature, the recovery tank (4-53) is opened to recover the gas source. At the same time, the pressure tank (4-51) injects new cold air flow until the cold air source is updated. The injection and update of the cold air source are repeated until the gas extraction operation is completed. The mine water (9) is rich in various salts and sulfate ions, which can dissolve the minerals in the gas storage rock layer to achieve the effect of expanding the pores and increasing the permeability, thereby allowing the mine water to penetrate deeper into the gas storage layer (1). At the same time, the mine water (9) cools down and solidifies, which can freeze a larger area of ​​the gas storage layer (1) and make it a dense whole. h. When the temperature sensor temperature slowly decreases, open the check valve (7-2) to carry out gas extraction operation; i. When the extraction concentration of the gas field decreases significantly, the main control console (4-6) starts the power station (4-5), and the air compressor (4-52) pressurizes the cold air source in the gas injection pipe and return pipe into the recovery gas tank (4-53). After the solid mine water loses its cold source, it slowly melts into liquid under the influence of the mine temperature. j. Repeat steps d and e to fill the elastic packing bag (10-5) with sufficient mine water, and re-seal the disc holes whose shape has changed after gas extraction. This solves the problem of stress redistribution in the gas reservoir and the impact of disc hole shape change on sealing quality. k. Repeat step f to inject more mine water (9) into the sealing area, causing the mine water to fill the new fractures and new channels generated by the gas reservoir (1); l. Repeat steps g~h to carry out new borehole plugging and gas extraction operations; m. After multiple sealing and extraction operations are completed, the gas content in the gas reservoir (1) will decrease significantly. At this time, operate the main control panel (4-6), turn on the air compressor (4-52) and the recovery gas tank (4-53), and discharge the cold air source in the pipeline. When the mine water (9) is liquefied again, open the three-way valve (7-1) to connect the water injection device (8) and the elastic sealing bag (10-5). Use the water injection device (8) to perform negative pressure water injection operation, drain the filling water in the elastic sealing bag (10-5). As the elastic sealing bag (10-5) shrinks, the sealing area is connected to the outside of the pre-extraction hole (2), and the mine water (9) in the sealing area flows out. Finally, disconnect the integrated sealing and extraction device (4) from the water injection pipe one (5-1), the water injection pipe two (5-2) and the pre-extraction pipe (6), and retrieve the integrated sealing and extraction device (4).

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