A reusable integrated sealing device and its usage method

Abstract

This invention discloses a reusable integrated borehole sealing device and its usage method. The device includes an integrated sealing unit, a pre-extraction pipe, and a valve. Under the unified control of the kinetic energy unit, water injector, electrically controlled valve, and integrated pipe fittings, the device performs water injection, sealing, cooling and curing sealing, and drainage operations, respectively. Finally, the integrated sealing unit is recycled for reuse. This invention achieves the recycling of the sealing device without affecting the borehole sealing effect, demonstrating significant application value.

Description

Technical Field

[0001] This invention belongs to the field of gas extraction, and particularly relates to a reusable integrated sealing device and its usage method. Background Technology

[0002] High-gas coal seams are characterized by high gas content and high gas pressure. To ensure safe mining, it is necessary to pre-drain the gas through boreholes to reduce the gas content and ensure that gas levels do not exceed limits during mining. Domestically and internationally, the main methods used are polyurethane sealing and "two-plug-one-injection" sealing. The sealing materials are primarily cement mortar and polyurethane. However, this sealing method can leave sealing materials and extraction pipe residues in the coal seam, affecting subsequent mining operations.

[0003] Therefore, in order to solve the above problems, there is an urgent need for a new device and method to meet the current needs of coal mines. Summary of the Invention

[0004] The purpose of this invention is to address the problem of sealing materials and devices remaining in the coal seam, affecting subsequent mining operations, by providing a reusable integrated sealing device and its usage method.

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

[0006] A reusable integrated sealing device is characterized by comprising an integrated sealing unit and a pre-extraction pipe. The integrated sealing unit consists of an integrated pipe fitting, a water injection pipe, a water return pipe, a water injector, a kinetic energy generator, a controller, wiring, a small-diameter elongated pipe system, a second air source input pipe, and a second air source output pipe. The integrated pipe fitting is composed of a long pipe fitting and a large-diameter pipe fitting. The left side of the integrated pipe fitting has several interfaces. The integrated pipe fitting is connected to the water injection pipe and the water return pipe through interfaces one and two, to the second air source input pipe and the second air source output pipe through interfaces four and five, and to the small-diameter elongated pipe system through four interfaces three. The other ends of the small-diameter elongated pipe system, the second air source input pipe, and the second air source output pipe are respectively connected to the kinetic energy generator. The other ends of the water injection pipe and the water return pipe are connected to the water injector. A controller is provided above the kinetic energy generator. Wiring connects the integrated pipe fitting, the water injector, and the kinetic energy generator to the controller.

[0007] Furthermore, the large-diameter pipe fitting has a large-diameter cooling channel with a diameter slightly smaller than that of the large-diameter pipe fitting itself near its right end face. The front part of the long pipe fitting passes through the large-diameter pipe fitting to the left wall of the large-diameter cooling channel, and the rear part is connected to the right wall of the large-diameter cooling channel. The exhaust pipe passes through the entire long pipe fitting and the large-diameter pipe fitting to form an annular space inside the long pipe fitting. The front annular space is provided with an air source channel one for air intake and an air source channel two for air return. The rear annular space forms a long cooling channel, a large-diameter cooling channel, and a cooling... An L-shaped partition is provided on the upper and lower sides of the connecting area of ​​the long channel. The L-shaped partition divides the connecting area of ​​the two pipes into two parts: an air intake cooling channel and a return air cooling channel. The left wall of the large-diameter cooling channel has through holes that connect to air source channel one and air source channel two, as well as through holes that allow pre-extraction pipes to pass through. Air source channel one and air source channel two are respectively connected to the two parts of the air intake cooling channel and the return air cooling channel. The air sources in the air intake cooling channel and the return air cooling channel are connected at two through-holes at the right end of the long cooling channel.

[0008] Furthermore, the upper, middle, and lower sides of the left end face of the long pipe are connected to the second air source input pipe via interface four, to the pre-extraction pipe via interface six, and to the second air source output pipe via interface five, respectively.

[0009] Furthermore, the small-diameter elongated orifice pipe system consists of four long straight cooling pipes, connecting pipes and connectors, a pipe distributor, a gas source input pipe, and a gas source output pipe. The long straight cooling pipes extend into the small-diameter elongated orifice and are connected to the connecting pipes outside the orifice through the connectors. The four connecting pipes are connected to one end of the pipe distributor, and the other end of the pipe distributor connects to the gas source input pipe and the gas source output pipe. The other ends of the gas source input pipe and the gas source output pipe are connected to the kinetic energy generator. The long straight cooling pipes and connecting pipes are divided into two channels by a long partition: a gas source inflow channel and a gas source return channel. The end of the long straight cooling pipe is provided with a through-hole to form a gas communication channel. The pipe distributor separates and combines the gas source inflow channel and the gas source return channel of the four long straight cooling pipes to form a gas source input channel and a gas source output channel, and connects these two channels to the gas source input pipe and the gas source output pipe, respectively.

[0010] Furthermore, the large-diameter pipe fitting has four through channels inside for long straight cooling pipes to pass through. The left end of the through channel is interface three, which is connected to the connector. The large-diameter pipe fitting also has two built-in through pipes inside, which pass through the left and right ends of the large-diameter pipe fitting. The left end of the built-in through pipes is connected to interface one and interface two respectively, and the right end is provided with an outlet and an electric control valve one, a return outlet and an electric control valve two respectively.

[0011] Furthermore, a groove is provided at the outer port of the right end of the long pipe fitting, and a sealing ring with an elastic inner wall is fixed to the groove. A circular tube partition is provided on the outer wall of the right end face of the large-diameter pipe fitting. The second sealing ring is attached to the outer wall of the circular tube partition and the right end face of the large-diameter pipe fitting. The first and second sealing rings are filled with a material with water absorption expansion and water loss shrinkage properties. A pressure sensor is provided directly above the sealing ring.

[0012] Furthermore, the kinetic energy generator is equipped with two sets of cooling equipment, including two pressurized air tanks, an air compressor, a recovery air tank, and supporting pipelines. The two sets of cooling equipment are connected in the same way: the air source input pipe is connected to the pressurized air tank and the air compressor, and the air source output pipe is connected to the recovery air tank. There are connectors at the interfaces where the air source input pipe and the air source output pipe pass through the kinetic energy generator. The connectors can clamp the air source input pipe and the air source output pipe inside the kinetic energy generator to the outside. The controller can control the two sets of cooling equipment inside the kinetic energy generator to inject cold air into the integrated pipe fitting and the small-diameter long-hole pipe system and discharge cold air, respectively, thereby completing the pre-extraction hole and small-diameter long-hole cooling curing and sealing operation.

[0013] Furthermore, the outer wall material of the gas source input pipe, gas source output pipe, pipe distributor, connecting pipe and connector, and connector has heat insulation and high pressure resistance. The length of the small-diameter long hole is slightly shorter than the length of the long pipe fitting that extends into the hole. The diameter and thickness of the large-diameter thin hole are slightly larger than the outer diameter of the sealing ring two and the width of the circular pipe partition wall, respectively. Temperature sensors are provided on the long pipe fitting and the long straight cooling pipe to monitor the temperature of the cold air source inside the pipe.

[0014] Furthermore, the outer wall of the long cooling channel and the right end face of the large-diameter cooling channel have good thermal conductivity, while the inner wall of the long cooling channel and the left end face of the large-diameter cooling channel have thermal insulation properties.

[0015] The present invention also provides a method of using the above-described reusable integrated sealing device, characterized by comprising the following steps:

[0016] a. Drill a large-diameter thin hole and four small-diameter long holes at the outer end and around the pre-drilling hole, respectively;

[0017] b. Pass the four long straight cooling pipes through the through channel and into the small-diameter long hole. Then connect the small-diameter long hole pipe system to the integrated pipe fitting and the kinetic energy unit through interface three, connector, and connector. Connect the air source input pipe two and air source output pipe two to the kinetic energy unit and the integrated pipe fitting through interface four, interface five, and connector. Connect the water injection pipe and water return pipe to the water injector and the integrated pipe fitting through interface one and interface two.

[0018] c. The wiring connects the kinetic energy unit, water injector, integrated pipe fittings, and controller to the downhole power supply;

[0019] d. Install the packer ring: Use strong adhesive to bond the packer ring two to the outer wall of the round pipe partition and the right wall of the large diameter pipe fitting, and fix the packer ring one into the groove of the long pipe;

[0020] e. Insert the integrated sealing device into the hole so that the long pipe and the long straight cooling pipe go deep into the pre-extraction hole and the small-diameter long hole respectively. At this time, the large-diameter pipe is close to the coal wall, and the sealing ring 2 and the round pipe partition go deep into the large-diameter thin hole.

[0021] f. Complete the isolation of the filling area: The controller starts the water injector and the electric control valve one to slowly inject water into the integrated sealing device. The water flows to the sealing ring one and sealing ring two, causing them to absorb water, expand and seal the drill hole. The pressure sensor sends the pressure value back to the controller. When the pressure value tends to stabilize, the controller increases the water injection pressure until the water injection volume tends to stabilize, and then stops the water injection operation.

[0022] g. Performing refrigeration and curing sealing operations: The controller activates the two sets of cooling equipment within the kinetic energy unit to perform refrigeration operations. The pressurized gas tank pressurizes the cold air source into the gas source input pipe one, and then distributes it to four connecting pipes and the long straight cooling pipe through the pipe distributor. The cold air source flows into the return channel through the through-hole, and then converges into the gas source output pipe one through the pipe distributor, until it enters the recovery gas tank. In addition, the cold air source flows into the intake cooling channel in the connecting area between the large-diameter cooling channel and the long cooling channel through the gas source input pipe two and the gas source channel one, and then returns to the long cooling channel through the through-hole. The return air cooling channel in the large-diameter cooling channel connects to the return air cooling channel in the large-diameter cooling channel. Finally, it returns to the recovery air tank through the second air source channel and the second air source output pipe. The cold air source in the large-diameter cooling channel, the long cooling channel and the long straight cooling pipe can absorb the heat of the external filling water, so that it solidifies and seals the pre-extraction hole and the small-diameter long hole. Four small-diameter long holes are arranged around the pre-extraction hole, which can increase the range of filling water infiltration into the coal body. The refrigeration operation of multiple cold sources makes the filling water in the coal body between the small-diameter long hole and the pre-extraction hole form a synergistic refrigeration effect, improves the solidification range and quality of the filling water, and thus improves the drilling sealing effect.

[0023] h. Connect the pre-extraction pipe and interface six. The valve is connected to the controller via the line. Open the valve to start the gas field extraction operation. The temperature data of each location point in the hole is transmitted back through the temperature sensor. When the temperature of the location point is higher than a certain temperature, the circulation cooling operation is carried out. The recovery gas tank is opened to recover the gas source. At the same time, the pressure storage tank is injected with new cold gas flow until the cold gas source is updated. The injection and updating of the cold gas source is repeated until the gas extraction operation is completed.

[0024] i. When the gas extraction concentration drops significantly, stop the extraction operation, disconnect the valve and controller, disconnect the pre-extraction pipe and interface six, and start the power generator at the same time. The two sets of refrigeration equipment use air compressors to press the cold air source in the pipeline into the recovery gas tank. After the solid sealing water loses its cold source, it slowly melts into liquid under the influence of the mine temperature.

[0025] j. Activate the water injector to pressurize the filling water in the blocked area back into the water injector;

[0026] k. The expansion material loses water and shrinks under the influence of the mine temperature, and gaps are formed between the sealing ring one and sealing ring two and the coal wall. The remaining filling water flows out of the sealing area and the integrated sealing device is recycled. After the maintenance is completed, the next round of sealing and extraction operations are started to achieve the purpose of reuse.

[0027] Beneficial effects

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] This device utilizes the solid-liquid phase transformation principle of water to carry out isolation and sealing borehole operations. On one hand, four small-diameter elongated holes are drilled around the pre-extraction hole. The filling water in the coal body between the small-diameter elongated holes and the pre-extraction hole forms a synergistic cooling effect, improving the solidification range and quality of the filling water, thereby improving the borehole sealing effect. On the other hand, after the extraction operation is completed, the sealing water liquefies and is drained, allowing the entire integrated sealing and extraction component to be recovered. Attached Figure Description

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

[0031] Figure 2 This is a schematic diagram of the structure of the device of the present invention for performing sealing and extraction operations.

[0032] Figure 3 This is a schematic diagram of the integrated pipe fittings and long straight cooling pipes of the device of the present invention.

[0033] Figure 4 This is a schematic diagram of the pipe connection structure of the integrated pipe fitting of the device of the present invention.

[0034] Figure 5 This is a schematic diagram of the connection structure between the long cooling channel and the large-diameter cooling channel of the present invention and the L-shaped partition wall.

[0035] Figure 6 This is a schematic diagram of the small-diameter elongated hole pipe system of the device of the present invention.

[0036] Figure 7 This is a schematic diagram of the composition and structure of the kinetic energy generator of the present invention.

[0037] Figure 8 This is a schematic diagram of the sealing ring and the grooved fastening structure of the long tube in the device of the present invention.

[0038] Figure 9 This is a schematic diagram showing the connection between the second sealing ring of the device of the present invention and the large-diameter pipe fitting.

[0039] Figure 10 This is a schematic diagram showing the distribution of the circular tube partition, the second sealing ring, and the large-diameter thin hole in the device of the present invention.

[0040] In the diagram: 1. Gas storage layer, 2. Pre-extraction hole, 3. Large-diameter thin hole, 3-1. Small-diameter long hole, 4. Integrated sealing device, 4-1. Integrated pipe fitting, 4-2. Long pipe fitting, 4-21. Gas source channel one, 4-22. Gas source channel two, 4-23. Long cooling channel, 4-24. Long partition, 4-3. Large-diameter pipe fitting, 4-31. Large-diameter cooling channel, 4-32. L-shaped partition, 4-33. Through channel, 4-34. Circular pipe partition, 4-41. Water injection pipe, 4-42. Water return pipe, 4-431. Interface one, 4-432. Interface two, 4-433. Interface three, 4-434. Interface four, 4-435. Interface five, 4-436. Interface six, 4-441. Water outlet, 4-442. Water return port, 4- 45. Built-in through pipe, 4-461. Electric control valve one, 4-462. Electric control valve two, 4-5. Water injector, 4-6. Kinetic energy unit, 4-61. Pressurized air tank, 4-62. Air compressor, 4-63. Recovered air tank, 4-7. Controller, 4-8. Wiring, 4-9. Small diameter long hole pipe system, 4-91. Long straight cooling pipe, 4-92. Connecting pipe, 4-93. Pipe distributor, 4-941. Air source input pipe one, 4-942. Air source input pipe two, 4-951. Air source output pipe one, 4-952. Air source output pipe two, 4-96. Connector, 4-97. Connecting piece, 4-10. Temperature sensor, 4-111. Sealing ring one, 4-112. Sealing ring two, 5. Pre-extraction pipe, 5-1. Valve. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] Example 1

[0044] like Figure 1-10As shown, a reusable integrated sealing device is characterized by comprising an integrated sealing unit 4 and a pre-extraction pipe 5. The integrated sealing unit 4 is composed of an integrated pipe fitting 4-1, a water injection pipe 4-41, a water return pipe 4-42, a water injector 4-5, a kinetic energy unit 4-6, a controller 4-7, a wiring 4-8, a small-diameter long-hole pipe system 4-9, a second air source input pipe 4-942, and a second air source output pipe 4-952. The integrated pipe fitting 4-1 is composed of a long pipe fitting 4-2 and a large-diameter pipe fitting 4-3. The left side of the integrated pipe fitting 4-1 is provided with several interfaces, which are connected to the water injection unit 4-1 through interface 4-431 and interface 4-432 respectively. Water pipe 4-41 and return water pipe 4-42 are connected to air source input pipe 4-942 and air source output pipe 4-952 via interface 4-434 and interface 5-435. They are connected to small-diameter long-hole pipe system 4-9 via four interfaces 4-433. The other ends of small-diameter long-hole pipe system 4-9, air source input pipe 4-942 and air source output pipe 4-952 are respectively connected to kinetic energy unit 4-6. The other ends of water injection pipe 4-41 and return water pipe 4-42 are connected to water injector 4-5. Controller 4-7 is located above kinetic energy unit 4-6. Line 4-8 connects integrated pipe fitting 4-1, water injector 4-5 and kinetic energy unit 4-6 to controller 4-7.

[0045] Furthermore, the large-diameter pipe 4-3 has a large-diameter cooling channel 4-31 with a diameter slightly smaller than that of the large-diameter pipe 4-3 near its right end face. The front part of the long pipe 4-2 passes through the large-diameter pipe 4-3 to the left wall of the large-diameter cooling channel 4-31, and the rear part is connected to the right wall of the large-diameter cooling channel 4-31. The exhaust pipe passes through the entire long pipe 4-2 and the large-diameter pipe 4-3 to form an annular space inside the long pipe 4-2. The front annular space is provided with an air source channel 4-21 for air intake and an air source channel 4-22 for air return. The rear annular space forms a long cooling channel 4-23. An L-shaped partition 4-32 is provided on the upper and lower sides of the connecting area of ​​the large-diameter cooling channel 4-31 and the long cooling channel 4-23. The L-shaped partition 4-32 divides the connecting area of ​​the two pipes into two parts: the air intake cooling channel and the air return cooling channel. The left wall of the large-diameter cooling channel 4-31 is provided with a through hole that connects to the first air source channel and the second air source channel, as well as a through hole that allows the pre-extraction pipe 5 to pass through. The first air source channel and the second air source channel are respectively connected to the two parts of the air intake cooling channel and the air return cooling channel. The air source in the air intake cooling channel and the air return cooling channel is connected to two through holes at the right end of the long cooling channel 4-23.

[0046] Furthermore, the upper, middle and lower sides of the left end face of the long pipe 4-2 are connected to the air source input pipe 4-942 via interface 4-434, to the pre-extraction pipe 5 via interface 6-436, and to the air source output pipe 4-952 via interface 5.

[0047] Furthermore, the small-diameter elongated orifice piping system 4-9 consists of four long straight cooling pipes 4-91, connecting pipes 4-92, connectors 4-96, a pipe splitter 4-93, an air source inlet pipe 4-941, and an air source outlet pipe 4-951. The long straight cooling pipes 4-91 extend into the small-diameter elongated orifice 3-1 and are connected to the connecting pipes 4-92 outside the orifice via connectors 4-96. The four connecting pipes 4-92 are connected to one end of the pipe splitter 4-93, and the other end of the pipe splitter 4-93 connects to the air source inlet pipe 4-941 and the air source outlet pipe 4-951. The air source inlet pipe 4-941... The other end of the air source output pipe 4-951 is connected to the kinetic energy unit 4-6. The long straight cooling pipe 4-91 and the connecting pipe 4-92 are divided into two channels by a long partition 4-24: an air source inflow channel and an air source return channel. The end of the long straight cooling pipe 4-91 is provided with a through port to form a gas communication channel. The pipe splitter 4-93 separates and combines the air source inflow channel and the air source return channel of the four long straight cooling pipes 4-91 to form an air source input channel and an air source output channel. These two channels are connected to the air source input pipe 4-941 and the air source output pipe 4-951, respectively.

[0048] Furthermore, the large-diameter pipe fitting 4-3 has four through channels 4-33 inside for the long straight cooling pipe 4-91 to pass through. The left port of the through channel 4-33 is interface three 4-433, which is connected to connector 4-96. The large-diameter pipe fitting 4-3 also has two built-in through pipes 4-45 inside, which pass through the left and right ends of the large-diameter pipe fitting 4-3. The left port of the built-in through pipe 4-45 is connected to interface one 4-431 and interface two 4-432 respectively. Its right port is provided with water outlet 4-441 and solenoid valve one 4-461, water return port 4-442 and solenoid valve two 4-462 respectively.

[0049] Furthermore, a groove is provided at the outer right end of the long pipe 4-2, and a sealing ring 4-111 with an inner wall of elastic material is fitted onto the groove. A circular tube partition 4-34 is provided on the outer right end face of the large-diameter pipe 4-3, and a sealing ring 4-112 is fitted and adhered to the outer wall of the circular tube partition 4-34 and the right end face of the large-diameter pipe 4-3. The sealing rings 4-111 and 4-112 are filled with a material that has the properties of swelling upon absorbing water and shrinking upon losing water. A pressure sensor is provided directly above the sealing rings.

[0050] Furthermore, the kinetic energy unit 4-6 is equipped with two sets of cooling equipment, including two pressurized gas tanks 4-61, an air compressor 4-62, a recovery gas tank 4-63, and supporting pipelines. The two sets of cooling equipment are connected in the same way. The gas source input pipe is connected to the pressurized gas tank 4-61 and the air compressor 4-62, and the gas source output pipe is connected to the recovery gas tank 4-63. A connector 4-97 is provided at the interface where the gas source input pipe and the gas source output pipe pass through the kinetic energy unit. The connector 4-97 can connect the gas source input pipe and the gas source output pipe inside the kinetic energy unit with the outside. The controller 4-7 can control the two sets of cooling equipment inside the kinetic energy unit 4-6 to inject cold air into the integrated pipe fitting 4-1 and the small-diameter long hole pipeline system 4-9 respectively, thereby completing the cooling, curing and sealing operation of the pre-extraction hole 2 and the small-diameter long hole 3-1.

[0051] Furthermore, the outer wall material of the gas source input pipe, gas source output pipe, pipe distributor 4-93, connecting pipe 4-92, connector 4-96, and connector 4-97 has heat insulation and high pressure resistance. The length of the small-diameter long hole 3-1 is slightly shorter than the length of the long pipe 4-2 that extends into the hole. The diameter and thickness of the large-diameter thin hole 3 are slightly larger than the outer diameter of the sealing ring 4-112 and the width of the circular pipe partition 4-34, respectively. Temperature sensors 4-10 are provided on both the long pipe 4-2 and the long straight cooling pipe 4-91 to monitor the temperature of the cold air source inside the pipe.

[0052] Furthermore, the outer wall of the long cooling channel 4-23 and the right end face of the large-diameter cooling channel 4-31 have good thermal conductivity, while the inner wall of the long cooling channel 4-23 and the left end face of the large-diameter cooling channel 4-31 have thermal insulation properties.

[0053] Example 2

[0054] The present invention also provides a method of using the reusable integrated sealing device according to Embodiment 1, comprising the following steps:

[0055] a. Drill large-diameter thin holes 3 and four small-diameter long holes 3-1 at the outer end and around the pre-drilling hole 2, respectively;

[0056] b. Pass the four long straight cooling pipes 4-91 through the through channel 4-33 and into the small diameter long hole 3-1. Then, connect the small diameter long hole pipe system 4-9 to the integrated pipe fitting 4-1 and the kinetic energy unit 4-6 through interface three 4-433, connector 4-96, and connector 4-97. Connect the air source input pipe two 4-942 and the air source output pipe two 4-952 to the kinetic energy unit 4-6 and the integrated pipe fitting 4-1 through interface four 4-434, interface five 4-435, and connector 4-97. Connect the water injection pipe 4-41 and the water return pipe 4-42 to the water injector 4-5 and the integrated pipe fitting 4-1 through interface one 4-431 and interface two 4-432.

[0057] c. The circuit connects the kinetic energy unit 4-6, the water injector 4-5, the integrated pipe fitting 4-1, and the controller 4-7, and connects to the downhole power supply;

[0058] d. Install the sealing rings: Use strong adhesive to bond the sealing ring 4-112 to the outer wall of the round pipe partition 4-34 and the right wall of the large diameter pipe fitting 4-3, and fit the sealing ring 4-111 into the groove of the long pipe fitting 4-2;

[0059] e. Insert the integrated sealing device 4 into the hole, so that the long pipe 4-2 and the long straight cooling pipe 4-91 are respectively inserted into the pre-extraction hole 2 and the small-diameter long hole 3-1. At this time, the large-diameter pipe 4-3 is tightly attached to the coal wall, and the sealing ring 2 4-112 and the round pipe partition 4-34 are inserted into the large-diameter thin hole 3.

[0060] f. Complete the isolation of the filling area: Controller 4-7 starts water injector 4-5 and solenoid valve 4-461 to slowly inject water into the integrated sealing device 4. The water flows to sealing ring 4-111 and sealing ring 4-112, causing them to absorb water, expand and seal the borehole. The pressure sensor sends the pressure value back to controller 4-7. When the pressure value tends to stabilize, controller 4-7 increases the water injection pressure until the water injection volume tends to stabilize, and then stops the water injection operation.

[0061] g. Performing refrigeration and curing sealing operations: Controller 4-7 activates the two sets of cooling equipment within the kinetic energy unit 4-6 to perform refrigeration operations. The pressurized gas tank 4-61 pressurizes the cold air source into the gas source input pipe 4-941, and then distributes it through the pipe distributor 4-93 to the four connecting pipes 4-92 and the long straight cooling pipe 4-91. The cold air source flows into the return channel through the through-hole, and then converges through the pipe distributor 4-93 into the gas source output pipe 4-951, until it enters the recovery gas tank 4-63. In addition, the cold air source flows into the intake cooling channel in the connecting area of ​​the large-diameter cooling channel 4-31 and the long cooling channel 4-23 through the gas source input pipe 4-942 and the gas source channel 4-21, and then returns sequentially through the through-hole. The return air cooling channel in the area connecting the long cooling channel 4-23 and the large-diameter cooling channel 4-31 finally returns to the recovery gas tank 4-63 through the second gas source channel 4-22 and the second gas source output pipe 4-952. The cold air source in the large-diameter cooling channel 4-31, the long cooling channel 4-23, and the long straight cooling pipe 4-91 can absorb the heat of the external filling water, so that it solidifies and seals the pre-extraction hole 2 and the small-diameter long hole 3-1. The four small-diameter long holes 3-1 arranged around the pre-extraction hole 2 can increase the range of filling water penetration into the coal body. The refrigeration operation of multiple cold sources makes the filling water in the coal body between the small-diameter long hole 3-1 and the pre-extraction hole 2 form a synergistic refrigeration effect, improve the solidification range and quality of the filling water, and thus improve the drilling sealing effect.

[0062] h. Connect the pre-extraction pipe 5 and interface 6 4-436. Connect valve 5-1 to controller 4-7 via line 4-8. Open valve 5-1 to start gas field extraction operation. Use temperature sensor 4-10 to transmit temperature data at each location point in the hole. When the temperature at a location point is higher than a certain temperature, perform circulating cooling operation. Open recovery gas tank 4-63 to recover the gas source. At the same time, inject new cold gas flow into pressurized gas tank 4-61 until the cold gas source is updated. Repeat the injection and update of cold gas source until the gas extraction operation ends.

[0063] i. When the gas extraction concentration drops significantly, stop the extraction operation, disconnect the connection between valve 5-1 and controller 4-7, disconnect the connection between pre-extraction pipe 5 and interface 6 4-436, and at the same time start the kinetic energy unit 4-6. The two sets of refrigeration equipment respectively use air compressor 4-62 to press the cold air source in the pipeline into the recovery gas tank 4-63. After the solid sealing water loses its cold source, it slowly melts into liquid under the influence of the mine temperature.

[0064] j. Start water injector 4-5 to pressurize the filling water in the blocked area back to water injector 4-5;

[0065] k. Under the influence of mine temperature, the expansion material loses water and shrinks, and gaps are formed between the sealing ring 1 4-111 and sealing ring 2 4-112 and the coal wall. The remaining filling water flows out of the sealing area and the integrated sealing device 4 is recycled. After the maintenance is completed, the next round of sealing and extraction operations are started to achieve the purpose of reuse.

[0066] 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 reusable integrated sealing device, characterized in that, The device includes an integrated sealing device (4) and a pre-extraction pipe (5). The integrated sealing device (4) is composed of an integrated pipe fitting (4-1), a water injection pipe (4-41), a water return pipe (4-42), a water injector (4-5), a kinetic energy device (4-6), a controller (4-7), a circuit (4-8), a small-diameter long-hole pipe system (4-9), a second air source input pipe (4-942), and a second air source output pipe (4-952). The integrated pipe fitting (4-1) is composed of a long pipe fitting (4-2) and a large-diameter pipe fitting (4-3). The left side of the integrated pipe fitting (4-1) is provided with several interfaces. The integrated pipe fitting (4-1) is connected to the water injection pipe (4-41) and the water return pipe (4-42) through interface one (4-431) and interface two (4-432), respectively. -42) Connect the gas source input pipe 2 (4-942) and the gas source output pipe 2 (4-952) through interface 4 (4-434) and interface 5 (4-435), and connect the small diameter long hole pipe system (4-9) through 4 interfaces 3 (4-433). The other ends of the small diameter long hole pipe system (4-9), the gas source input pipe 2 (4-942) and the gas source output pipe 2 (4-952) are respectively connected to the kinetic energy unit (4-6). The other ends of the water injection pipe (4-41) and the water return pipe (4-42) are connected to the water injector (4-5). The controller (4-7) is located above the kinetic energy unit (4-6). The line (4-8) connects the integrated pipe fitting (4-1), the water injector (4-5) and the kinetic energy unit (4-6) to the controller (4-7). The small-diameter elongated pipe system (4-9) consists of four long straight cooling pipes (4-91), connecting pipes (4-92), connectors (4-96), a pipe splitter (4-93), an air source inlet pipe (4-941), and an air source outlet pipe (4-951). The long straight cooling pipes (4-91) extend into the small-diameter elongated hole (3-1) and are connected to the connecting pipes (4-92) outside the hole via connectors (4-96). The four connecting pipes (4-92) are connected to one end of the pipe splitter (4-93), and the other end of the pipe splitter (4-93) connects to the air source inlet pipe (4-941) and the air source outlet pipe (4-951). -941) and the other end of the air source output pipe (4-951) are connected to the kinetic energy unit (4-6). The long straight cooling pipe (4-91) and the connecting pipe (4-92) are divided into two channels, an air source inflow channel and an air source return channel, by a long partition (4-24). The end of the long straight cooling pipe (4-91) is provided with a through port to form a gas communication channel. The pipe splitter (4-93) separates and combines the air source inflow channel and the air source return channel of the four long straight cooling pipes (4-91) to form an air source input channel and an air source output channel, and connects these two channels to the air source input pipe (4-941) and the air source output pipe (4-951) respectively. The kinetic energy unit (4-6) is equipped with two sets of cooling equipment, including two pressurized gas tanks (4-61), an air compressor (4-62), a recovery gas tank (4-63), and supporting pipelines. The two sets of cooling equipment are connected in the same way. The gas source input pipe is connected to the pressurized gas tank (4-61) and the air compressor (4-62), and the gas source output pipe is connected to the recovery gas tank (4-63). The interface where the gas source input pipe and the gas source output pipe pass through the kinetic energy unit is provided with a connector (4-97). The connector (4-97) can connect the gas source input pipe and the gas source output pipe inside the kinetic energy unit with the outside. The controller (4-7) can control the two sets of cooling equipment inside the kinetic energy unit (4-6) to inject cold air into the integrated pipe fitting (4-1) and the small-diameter long hole pipe system (4-9) respectively, thereby completing the cooling, curing and sealing operation of the pre-extraction hole (2) and the small-diameter long hole (3-1).

2. The reusable integrated sealing device according to claim 1, characterized in that, The large-diameter pipe fitting (4-3) has a large-diameter cooling channel (4-31) with a diameter slightly smaller than that of the large-diameter pipe fitting (4-3) near its right end face. The front part of the long pipe fitting (4-2) passes through the large-diameter pipe fitting (4-3) to the left wall of the large-diameter cooling channel (4-31), and the rear part is connected to the right wall of the large-diameter cooling channel (4-31). The exhaust pipe passes through the entire long pipe fitting (4-2) and the large-diameter pipe fitting (4-3) to form an annular space inside the long pipe fitting (4-2). The front annular space is provided with an air source channel one (4-21) for air intake and an air source channel two (4-22) for air return. The rear annular space forms a long cooling channel (4-21). 23) An L-shaped partition (4-32) is provided on the upper and lower sides of the connecting area of ​​the large-diameter cooling channel (4-31) and the long cooling channel (4-23). ​​The L-shaped partition (4-32) divides the connecting area of ​​the two pipes into two parts: the air intake cooling channel and the air return cooling channel. The left wall of the large-diameter cooling channel (4-31) is provided with a through hole connected to the first air source channel and the second air source channel, as well as a through hole that allows the pre-extraction pipe (5) to pass through. The first air source channel and the second air source channel are respectively connected to the two parts of the air intake cooling channel and the air return cooling channel. The air source in the air intake cooling channel and the air return cooling channel is connected at the two through holes at the right end of the long cooling channel (4-23).

3. The reusable integrated sealing device according to claim 1, characterized in that, The upper, middle and lower sides of the left end face of the long pipe fitting (4-2) are connected to the gas source input pipe two (4-942) through interface four (4-434), to the pre-extraction pipe (5) through interface six (4-436), and to the gas source output pipe two (4-952) through interface five (4-435).

4. The reusable integrated sealing device according to claim 1, characterized in that, The large-diameter pipe fitting (4-3) has four through channels (4-33) inside for the long straight cooling pipe (4-91) to pass through. The left port of the through channel (4-33) is interface three (4-433), which is connected to the connector (4-96). The large-diameter pipe fitting (4-3) also has two built-in through pipes (4-45) inside, which pass through the left and right ends of the large-diameter pipe fitting (4-3). The left port of the built-in through pipe (4-45) is connected to interface one (4-431) and interface two (4-432) respectively. Its right port is provided with water outlet (4-441) and electric control valve one (4-461), water return port (4-442) and electric control valve two (4-462) respectively.

5. The reusable integrated sealing device according to claim 1, characterized in that, A groove is provided at the outer port of the right end of the long pipe fitting (4-2). A sealing ring one (4-111) with an inner wall of elastic material is fixed on the groove. A circular tube partition (4-34) is provided on the outer wall of the right end face of the large-diameter pipe fitting (4-3). A sealing ring two (4-112) is fitted and adhered to the outer wall of the circular tube partition (4-34) and the right end face of the large-diameter pipe fitting (4-3). The sealing ring one (4-111) and the sealing ring two (4-112) are filled with a material with water absorption expansion and water loss shrinkage properties. A pressure sensor is provided directly above the sealing ring.

6. The reusable integrated sealing device according to claim 1, characterized in that, The outer wall material of the gas source input pipe, gas source output pipe, pipe splitter (4-93), connecting pipe (4-92), connector (4-96), and connector (4-97) has heat insulation and high pressure resistance. The length of the small-diameter long hole (3-1) is slightly shorter than the length of the long pipe fitting (4-2) that extends into the hole. The diameter and thickness of the large-diameter thin hole (3) are slightly larger than the outer diameter of the sealing ring II (4-112) and the width of the circular pipe partition wall (4-34), respectively. Temperature sensors (4-10) are provided on both the long pipe fitting (4-2) and the long straight cooling pipe (4-91) to monitor the temperature of the cold air source inside the pipe.

7. A reusable integrated sealing device according to claim 2, characterized in that, The outer wall of the long cooling channel (4-23) and the right end face of the large-diameter cooling channel (4-31) have good thermal conductivity, while the inner wall of the long cooling channel (4-23) and the left end face of the large-diameter cooling channel (4-31) have thermal insulation properties.

8. The method of using the reusable integrated sealing device according to any one of claims 1-7, characterized in that, Includes the following steps: a. Drill large-diameter thin holes (3) and four small-diameter long holes (3-1) at the outer end and around the pre-drilling hole (2). b. Pass the four long straight cooling pipes (4-91) through the through channel (4-33) and into the small-diameter long hole (3-1). Then connect the small-diameter long hole pipe system (4-9) with the integrated pipe fitting (4-1) and the kinetic energy unit (4-6) through interface three (4-433), connector (4-96), and connector (4-97). Connect the air source input pipe two (4-942) and air source output pipe two (4-952) with the kinetic energy unit (4-6) and the integrated pipe fitting (4-1) through interface four (4-434), interface five (4-435), and connector (4-97). Connect the water injection pipe (4-41) and the water return pipe (4-42) with the water injector (4-5) and the integrated pipe fitting (4-1) through interface one (4-431) and interface two (4-432). c. The line connects the kinetic energy unit (4-6), water injector (4-5), integrated pipe fitting (4-1) and controller (4-7), and connects to the downhole power supply; d. Install the sealing rings: Use strong adhesive material to bond the second sealing ring (4-112) to the outer wall of the round pipe partition (4-34) and the right wall of the large diameter pipe fitting (4-3), and fit the first sealing ring (4-111) into the groove of the long pipe fitting (4-2); e. Insert the integrated sealing device (4) into the hole so that the long pipe (4-2) and the long straight cooling pipe (4-91) penetrate into the pre-extraction hole (2) and the small diameter long hole (3-1) respectively. At this time, the large diameter pipe (4-3) is close to the coal wall, and the sealing ring 2 (4-112) and the round pipe partition (4-34) penetrate into the large diameter thin hole (3). f. Complete the isolation of the filling area: The controller (4-7) starts the water injector (4-5) and the first electric control valve (4-461) to slowly inject water into the integrated sealing device (4). The water flows to the first sealing ring (4-111) and the second sealing ring (4-112) to cause them to absorb water, expand and seal the borehole. The pressure sensor sends the pressure value back to the controller (4-7). When the pressure value tends to stabilize, the controller (4-7) increases the water injection pressure until the water injection volume tends to stabilize, and then stops the water injection operation. g. Performing refrigeration and curing sealing operations: The controller (4-7) starts the two sets of cooling equipment in the kinetic energy unit (4-6) to perform refrigeration operations. The pressure tank (4-61) pressurizes the cold air source into the first air source input pipe (4-941), and distributes it to the four connecting pipes (4-92) and the long straight cooling pipe (4-91) through the pipe distributor (4-93). The cold air source flows into the return channel through the through port, and then flows into the first air source output pipe (4-951) through the pipe distributor (4-93) until it enters the recovery tank (4-63). In addition, the cold air source flows into the intake cooling channel in the connecting area of ​​the large diameter cooling channel (4-31) and the long cooling channel (4-23) through the second air source input pipe (4-942) and the first air source channel (4-21), and then returns through the through port. The return air cooling channel in the area connected to the long cooling channel (4-23) and the large-diameter cooling channel (4-31) finally returns to the recovery gas tank (4-63) through the second gas source channel (4-22) and the second gas source output pipe (4-952). The cold air source in the large-diameter cooling channel (4-31), the long cooling channel (4-23) and the long straight cooling pipe (4-91) can absorb the heat of the external filling water, so that it solidifies and seals the pre-extraction hole (2) and the small-diameter long hole (3-1). Four small-diameter long holes (3-1) are arranged around the pre-extraction hole (2), which can increase the range of filling water infiltration into the coal body. The refrigeration operation of multiple cold sources makes the filling water in the coal body between the small-diameter long hole (3-1) and the pre-extraction hole (2) form a synergistic refrigeration effect, improve the solidification range and quality of the filling water, and thus improve the drilling sealing effect. h. Connect the pre-extraction pipe (5) and interface six (4-436). Connect the valve (5-1) to the controller (4-7) through the line (4-8). Open the valve (5-1) to start the gas field extraction operation. Transmit the temperature data of each position point in the hole through the temperature sensor (4-10). When the temperature of the position point is higher than a certain temperature, perform the circulating cooling operation. Open the recovery gas tank (4-63) to recover the gas source. At the same time, inject new cold gas flow into the pressure storage tank (4-61) until the cold gas source is updated. Repeat the injection and update of the cold gas source until the gas extraction operation ends. i. When the gas extraction concentration drops significantly, stop the extraction operation, disconnect the valve (5-1) and controller (4-7), disconnect the pre-extraction pipe (5) and interface six (4-436), and start the kinetic energy unit (4-6). The two sets of refrigeration equipment respectively use air compressors (4-62) to press the cold air source in the pipeline into the recovery gas tank (4-63). After the solid sealing water loses its cold source, it slowly melts into liquid under the influence of the mine temperature. j. Start the water injector (4-5) to pressurize the filling water in the blocked area back to the water injector (4-5); k. The expansion material loses water and shrinks under the influence of the mine temperature. The sealing ring 1 (4-111) and sealing ring 2 (4-112) create gaps with the coal wall. The remaining filling water flows out of the sealing area and the integrated sealing device (4) is recycled. After the maintenance is completed, the next round of sealing and extraction operations are started to achieve the purpose of reuse.

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