High-pressure pulse water injection device for coal bed gas exploitation

Abstract

The invention relates to a high-pressure pulse water injection device for coal bed gas exploitation, in particular to the technical field of coal bed exploitation. Comprising a first liquid storage part, the first liquid storage part is fixedly connected with a second liquid storage part, the side, close to the first liquid storage part, of the second liquid storage part is fixedly connected with and communicates with first liquid guide pipes distributed in a mirror image mode, and one-way valves are arranged in the first liquid guide pipes; the sides, away from the second liquid storage part, of the first liquid guide pipes in mirror image distribution are fixedly connected and communicated with the sides, away from the second liquid storage part, of the first liquid storage parts, the sides, away from the second liquid storage part, of the first liquid storage parts are fixedly connected and communicated with gas guide pipes, and the gas guide pipes penetrate through the second liquid storage part and are fixedly connected with the second liquid storage part. By changing the water injection mode of the coal seam and adopting the mode of injecting the fracturing fluid into the coal seam, the time for the fracturing fluid to permeate into the coal seam is shortened, and the fracturing fluid is accurately injected into the position needed by work in the coal seam.

Description

Technical Field

[0001] This invention relates to the field of coal seam mining technology, and in particular to a high-pressure pulse water injection device for coalbed methane extraction. Background Technology

[0002] In the process of coal mining, water injection replacement is usually used to treat the coal mine. The purpose of water injection replacement is to inject an appropriate amount of fracturing fluid into the coal seam, thereby increasing the formation pressure, improving the coal recovery rate, and fracturing the coal seam. The "water" in water injection replacement is a fracturing fluid composed of water and additives, or more of them.

[0003] The existing water-injection replacement method involves drilling suitable holes in the area requiring water replacement, then inserting an injection pipe into the hole to inject fracturing fluid. The fracturing fluid then seeps into the coal seam through the inner wall of the hole, thereby increasing formation pressure. However, with traditional water-injection replacement, the location of fracturing fluid penetration is uncontrollable, which can lead to the fracturing fluid failing to accurately penetrate to the required area. Furthermore, excessive fracturing fluid penetration into the coal seam can, at best, affect the stratification of the coal seam, and at worst, cause the coal seam to collapse. Summary of the Invention

[0004] This invention provides a high-pressure pulse water injection device for coalbed methane extraction, which solves the problem of uncontrollable fracturing fluid penetration in traditional water replacement methods.

[0005] The technical solution of the present invention is as follows: a high-pressure pulse water injection device for coalbed methane extraction, comprising a first liquid storage component, a second liquid storage component fixedly connected to the first liquid storage component, a first liquid guide pipe fixedly connected and connected to the side of the second liquid storage component near the first liquid storage component, a one-way valve disposed inside the first liquid guide pipe, and the sides of the mirror-distributed first liquid guide pipes away from the second liquid storage component being fixedly connected and connected to the side of the first liquid storage component away from the second liquid storage component, and a gas guide pipe fixedly connected and connected to the side of the first liquid storage component away from the second liquid storage component. The first liquid storage component is slidably connected to the second liquid storage component and the second liquid storage component is fixedly connected to and connected to the first liquid storage component on the side away from the first liquid storage component. The second liquid storage component is provided with a first electric push rod electrically connected to a remote control terminal. The telescopic end of the first electric push rod passes through the first liquid storage component and is fixedly connected to the first sliding plate. A rotating component is provided on the side of the first liquid storage component away from the second liquid storage component. A mirror-distributed liquid guide cylinder is fixedly connected to the rotating component. A pressure relief valve is provided on the opposite sides of the mirror-distributed liquid guide cylinder.

[0006] Furthermore, it is particularly preferred that each of the mirror-distributed liquid guide tubes is slidably connected to a liquid outlet, and the diameter of the orifice on the opposite side of the mirror-distributed liquid outlet is larger than the diameter of the orifice on the opposite side.

[0007] Furthermore, particularly preferably, the outer periphery of both the first and second liquid storage components is fixedly connected with guide wheels arranged in a ring array; the opposing sides of the mirror-distributed liquid guide cylinders are slidably connected with sliding frames; a spring is provided between the sliding frames and the rotating component; the sliding frames are rotatably engaged with adjacent liquid outlet components; the mirror-distributed pressure relief valves are all located between the mirror-distributed sliding frames; the sliding frames are fixedly connected with sealing plates that slidably engage with adjacent liquid guide cylinders; the opposing sides of the mirror-distributed liquid outlet components are fixedly connected with first spikes arranged in a ring array; the rotating component is fixedly connected with limiting blocks arranged in a ring array; the outer periphery of the liquid outlet component is provided with oblique grooves arranged in a ring array; the oblique grooves on the outer periphery of the liquid outlet component are slidably engaged with adjacent limiting blocks; the rotating component is provided with a second sliding plate, which is located below the mirror-distributed liquid guide cylinders.

[0008] Furthermore, particularly preferably, it also includes a pre-wetting component disposed within the rotating member. The pre-wetting component is used to pre-wet the coal seam. The pre-wetting component includes a fixing frame, which is fixedly connected to the side of the first liquid storage component near the rotating member. The side of the fixing frame away from the first liquid storage component passes through and slidably engages with the second sliding plate. A connecting frame is fixedly connected to the side of the fixing frame located within the rotating member. The connecting frame is fixedly connected to mirror-distributed third liquid storage components. Each of the mirror-distributed third liquid storage components has a piston rod slidably connected to it. The piston rod has a communicating hole, and a one-way valve is disposed within the communicating hole of the piston rod. The piston rod is located away from the connecting frame. The first liquid storage component is fixedly connected to the second sliding plate. The third liquid storage component is fixedly connected to and connected to the side of the connecting frame by an inlet pipe. The inlet pipe passes through the second sliding plate and slides with it. The third liquid storage component is connected to the first liquid storage component through the adjacent inlet pipe. The side of the third liquid storage component away from the connecting frame is fixedly connected to and connected to an outlet pipe that passes through the second sliding plate and the first liquid storage component. The side of the first liquid storage component near the rotating component is fixedly connected to a liquid guide ring. The liquid guide ring is located below the mirror-distributed first liquid guide pipes. The liquid guide ring is provided with annularly arrayed outlet holes. The second sliding plate slides with the rotating component. A spring is provided between the second sliding plate and the rotating component.

[0009] Furthermore, it is particularly preferred that the liquid outlet holes located on the outer periphery of the liquid guiding ring and distributed in a ring array are all set in an inclined state for impacting the coal seam.

[0010] Furthermore, particularly preferably, it also includes a driving assembly disposed within the rotating member. The driving assembly is used to drive the rotating member to rotate. The driving assembly includes a rotating member rotatably connected to the rotating member and rotatably engaged with the connecting frame. A torsion spring is disposed between the rotating member and the rotating member. The connecting frame is fixedly connected to a ring array of elastic members. A sliding ring is slidably connected to the side of the fixed frame near the connecting frame. The sliding ring is fixedly connected to the second sliding plate via mirror-distributed connecting rods. The sliding ring is fixedly connected to a ring array of limiting pins. The ring array of elastic members slidably engages with adjacent limiting pins. A limiting frame is fixedly connected to the side of the rotating member away from the connecting frame. All the ring array of limiting pins engages with the limiting frame. The limiting frame is located above the ring array of elastic members.

[0011] Furthermore, particularly preferably, it also includes a fall-prevention component, which is disposed on the side of the first liquid storage member away from the rotating member. The fall-prevention component is used to prevent the first liquid storage member from falling. The fall-prevention component includes a mirror-distributed first sliding member, each of which is slidably connected to the side of the second liquid storage member away from the first liquid storage member. A spring is provided between the first sliding member and the second liquid storage member. A second sliding member is slidably connected to the opposite side of each of the mirror-distributed first sliding members. A second spike distributed in a rectangular array is fixed to the opposite side of each of the mirror-distributed second sliding members. The second liquid storage member is provided with a control component, which is used to drive the mirror-distributed first sliding members to slide.

[0012] Furthermore, it is particularly preferred that the second spikes distributed in a rectangular array are all set in an inclined state to fix the adjacent first sliders.

[0013] Furthermore, it is particularly preferred that a spring is provided between the second slider and the adjacent first slider, the spring being used to provide cushioning for the adjacent first slider.

[0014] Furthermore, it is particularly preferred that the control component includes a second electric push rod, which is disposed on the side of the second liquid storage component away from the first liquid storage component. The second electric push rod is electrically connected to a remote control terminal. A third sliding member is fixedly connected to the telescopic end of the second electric push rod. The third sliding member is provided with mirror-distributed inclined surfaces. The opposing sides of the mirror-distributed first sliding member are each provided with inclined surfaces that respectively press against the mirror-distributed inclined surfaces of the third sliding member.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This invention changes the water injection method into the coal seam by injecting fracturing fluid directly into the coal seam, thereby shortening the time for the fracturing fluid to penetrate into the coal seam and accurately injecting the fracturing fluid to the required working location within the coal seam. This avoids the uncontrollable location of fracturing fluid penetration when using existing water injection penetration methods, which can lead to the fracturing fluid failing to accurately penetrate to the required working area.

[0017] 2. During the transfer of fracturing fluid, gas is injected into the fracturing fluid in the first reservoir through the gas delivery pipe. This causes the fracturing fluid in the first reservoir to generate bubbles and increases the pressure of the fracturing fluid. This increases the mixing degree of the fracturing fluid and prevents the fracturing fluid from settling in the first reservoir, which would reduce the mixing degree of the fracturing fluid in the first reservoir.

[0018] 3. During the process of injecting water into the borehole, the fracturing fluid in the first storage container is squeezed by the pressure relief valve and the first sliding plate, so that the fracturing fluid is sprayed out from the adjacent outlet in a pulse manner, impacting the inner wall of the borehole, and the fracturing fluid in the first storage container is guided to the coal seam around the borehole through the outlet, thereby achieving deep water injection into the coal seam.

[0019] 4. When the first liquid storage component and its parts fall upward, the first and third sliding components are mirror-distributed, causing the second sliding component to drive the second spike and move towards each other, thereby inserting the second spike into the hole to prevent the first liquid storage component and its parts from falling. Attached Figure Description

[0020] Figure 1 This is a three-dimensional front view of the present invention;

[0021] Figure 2 This is a rear view of the three-dimensional structure of the present invention;

[0022] Figure 3 This is a three-dimensional structural cross-sectional view of the second liquid storage component of the present invention;

[0023] Figure 4 This is a three-dimensional structural cross-sectional view of the first liquid storage component of the present invention;

[0024] Figure 5 This is a three-dimensional sectional view of the limiting block and the liquid outlet component of the present invention when they are in contact.

[0025] Figure 6 This is an exploded three-dimensional view of the liquid outlet component and the limiting block of the present invention;

[0026] Figure 7 This is a three-dimensional structural schematic diagram of the pre-wetting component of the present invention;

[0027] Figure 8 This is a three-dimensional structural cross-sectional view of the third liquid storage component of the present invention;

[0028] Figure 9 This is an exploded three-dimensional view of the pre-wetting component of the present invention;

[0029] Figure 10 This is a three-dimensional structural cross-sectional view of the first sliding member of the present invention.

[0030] Reference numerals: 101, First liquid storage component; 1011, First liquid guide tube; 1012, Gas guide tube; 1013, First sliding plate; 102, Second liquid storage component; 1021, Second liquid guide tube; 1022, First electric push rod; 1023, Guide wheel; 103, Rotating component; 1031, Liquid guide cylinder; 1032, Pressure relief valve; 1033, Liquid outlet component; 1034, Sliding frame; 1035, Sealing plate; 1036, First spike; 1037, Limiting block; 1038 202. Second sliding plate, 203. Fixed frame, 204. Connecting frame, 205. Third liquid storage component, 206. Piston rod, 207. Liquid inlet pipe, 208. Liquid outlet pipe, 209. Liquid guide ring, 301. Liquid outlet hole, 302. Rotating component, 303. Elastic component, 304. Sliding ring, 305. Limiting pin, 306. Limiting frame, 407. First sliding component, 408. Second sliding component, 409. Second spike, 500. Second electric push rod, 501. Third sliding component. Detailed Implementation

[0031] The following description provides many different embodiments or examples for implementing various features of the invention. The elements and arrangements described in the specific examples below are only for concise expression of the invention and are merely examples, not intended to limit the invention.

[0032] Example 1: A high-pressure pulse water injection device for coalbed methane extraction, such as... Figures 1-6As shown, the device includes a first liquid storage component 101, and a second liquid storage component 102 fixedly connected to the upper side of the first liquid storage component 101. The volume of the second liquid storage component 102 is half the volume of the first liquid storage component 101. Two first liquid guide pipes 1011, arranged in a left-right mirror image, are fixedly connected to the lower side of the second liquid storage component 102. The lower sides of the two first liquid guide pipes 1011 are both fixedly connected to the lower side of the first liquid storage component 101. The second liquid storage component 102 communicates with the first liquid storage component 101 through the two first liquid guide pipes 1011. A one-way valve is installed inside the first liquid guide pipe 1011. When the second liquid storage component 102 transports fracturing fluid into the first liquid storage component 101 through the two first liquid guide pipes 1011, the first liquid guide pipe 1011... When the one-way valve is open, and conversely, when the second liquid storage unit 102 no longer supplies fracturing fluid to the first liquid storage unit 101 through the two first liquid guide pipes 1011, the one-way valve of the first liquid guide pipe 1011 is closed. A gas guide pipe 1012 is fixedly connected to and connected to the lower side of the first liquid storage unit 101. The gas guide pipe 1012 is located between the two mirror-distributed first liquid guide pipes 1011. Gas is supplied to the first liquid storage unit 101 through the gas guide pipe 1012. The gas entering the first liquid storage unit 101 contacts the fracturing fluid inside and moves upward as bubbles, agitating the fracturing fluid and increasing its mixing degree, thereby increasing the fracturing fluid's fracturing ability in coal mines. The gas guide pipe 1012... A first sliding plate 1013 is slidably connected to the rear side of the second liquid storage component 102. A second liquid guide tube 1021 is fixedly connected to and communicates with the upper side of the second liquid storage component 102. A first electric push rod 1022 is provided on the side of the second liquid storage component 102 near its center. The first electric push rod 1022 is electrically connected to a remote control terminal. The telescopic end of the first electric push rod 1022 passes through the upper side of the first liquid storage component 101 and is fixedly connected to the upper side of the first sliding plate 1013. When the first electric push rod 1022 drives the first sliding plate 1013 to slide upward in the first liquid storage component 101, a negative pressure environment is formed in the first liquid storage component 101. The two first liquid guide tubes 1011 connect the first liquid storage component 101 and the second liquid storage component 102. Under the action of the fluid storage device 102 being connected, the fracturing fluid in the second fluid storage device 102 is drawn into the two first fluid guide pipes 1011, and the two first fluid guide pipes 1011 transport the fracturing fluid to the first fluid storage device 101 to complete the transfer of fracturing fluid. A rotating member 103 is provided on the lower side of the first fluid storage device 101. Two fluid guide cylinders 1031, which are arranged in a mirror image, are fixed to the left and right sides of the rotating member 103, respectively. Pressure relief valves 1032 are provided on the opposing sides of the mirror-arranged fluid guide cylinders 1031. When the pressure in the first fluid storage device 101 exceeds the threshold of the two pressure relief valves 1032, the first fluid storage device 101 is connected to the two fluid guide cylinders 1031. At this time, the fracturing fluid in the first fluid storage device 101 is ejected from the two fluid guide cylinders 1031.Two mirror-image fluid guide cylinders 1031 are each slidably connected to a fluid outlet 1033. The orifice diameters on the facing sides of the mirror-image fluid outlets 1033 are both larger than the orifice diameters on their opposing sides. When fracturing fluid is ejected from the fluid guide cylinders 1031, the fluid guide cylinders 1031 transport the fracturing fluid to the adjacent fluid outlet 1033. Due to the different orifice diameters on both sides of the fluid outlet 1033, when the fracturing fluid enters the fluid outlet 1033, it pushes the fluid outlet 1033 towards the direction of the orifice.

[0033] like Figures 1-6 As shown, four guide wheels 1023 arranged in a ring array are fixed to the outer periphery of the first liquid storage component 101 and the second liquid storage component 102. When the guide wheels 1023 contact the inner wall of the hole, they guide the first liquid storage component 101, the second liquid storage component 102 and their components, allowing them to slide stably within the hole. Sliding frames 1034 are slidably connected to the opposing sides of the two mirror-distributed liquid guide cylinders 1031. A spring for resetting the sliding frame 1034 is provided between the sliding frame 1034 and the rotating component 103. The sliding frame 1034 is in a limiting, sealing, and rotating engagement with the adjacent liquid outlet component 1033. Two pressure relief valves 1032 are located between the two mirror-distributed sliding frames 1034. A sealing plate 10 is fixed to the middle of the sliding frame 1034, which is in a sealing and sliding engagement with the adjacent liquid guide cylinder 1031. 35. The sealing plate 1035 is used to block the sliding trajectory of the adjacent sliding frame 1034 on the adjacent liquid guide cylinder 1031. The side of the liquid outlet 1033 away from the adjacent pressure relief valve 1032 is fixed with a first spike 1036 distributed in a ring array. The first spike 1036 is used to break the inner wall of the hole. The rotating part 103 is fixed with four limiting blocks 1037 that are mirror images of each other and distributed in a ring array. The outer periphery of the liquid outlet 1033 is provided with a circumferentially distributed inclined sliding groove. The inclined sliding groove on the outer periphery of the liquid outlet 1033 is limited and slidably engaged with the adjacent limiting block 1037. Through the engagement of the inclined sliding groove on the outer periphery of the liquid outlet 1033 with the adjacent limiting block 1037, the two liquid outlets 1033 rotate during the back-to-back movement. The upper side of the rotating part 103 is provided with a second sliding plate 1038. The second sliding plate 1038 is located below the mirror-distributed liquid guide cylinder 1031.

[0034] When water injection is required into the coal seam (the injected water is not pure water, but a mixed liquid called fracturing fluid, which usually includes water, chemical additives or other substances to increase the fracturing effect), the workers first drill holes in the water injection area that meet the requirements of the work, and then the coal seam is injected with water using this device.

[0035] Before using this device to inject water into the coal seam, the operator connects the upper side of the gas guide pipe 1012 to the gas inlet, and then connects the upper side of the second liquid guide pipe 1021 to the liquid inlet. The liquid inlet delivers fracturing fluid from the second liquid guide pipe 1021 to the second liquid storage container 102, filling the second liquid storage container 102 with fracturing fluid (after the second liquid storage container 102 is filled with fracturing fluid, the liquid inlet stops delivering fracturing fluid into the second liquid storage container 102). Finally, the device is suspended from the rope end of an existing delivery device (e.g., winch, hoist, and hoist), and then the operator places the device into the hole that needs to be injected with water.

[0036] After the staff places the device into the hole that needs to be filled with water, the eight guide wheels 1023 fit against the inside of the hole, thereby providing auxiliary movement for the first liquid storage component 101 and the second liquid storage component 102 and their parts, and allowing the first liquid storage component 101 and the second liquid storage component 102 to move adaptively along the curvature of the hole. Then, the device is slowly placed into the hole that needs to be filled with water through the delivery device.

[0037] When the device reaches the borehole requiring water injection (the existing water injection method involves inserting an injection pipe into the borehole, then injecting the required amount of fracturing fluid into the borehole through the injection pipe; the fracturing fluid entering the borehole permeates into the coal seam through its inner wall to increase the pressure in the formation), the operator no longer manipulates the external delivery device to move the device. At this time, the operator uses a remote control terminal to operate the first electric push rod 1022 to pull the first sliding plate 1013 at its telescopic end upwards (the first sliding plate 1013 is not...). When pulled: The first sliding plate 1013 is located on the lower side of the first liquid storage component 101 and above the lower side of the two first liquid guide pipes 1011. As the first sliding plate 1013 moves upward, a negative pressure environment is gradually formed between the first liquid storage component 101 and the rotating component 103. Under the action of the negative pressure environment in the first liquid storage component 101, the one-way valves in the two first liquid guide pipes 1011 are opened, so that the fracturing fluid in the second liquid storage component 102 is transported to the first liquid storage component 101 through the two first liquid guide pipes 1011.

[0038] When the first sliding plate 1013 is slidably connected to the middle of the first liquid storage container 101, all the fracturing fluid in the second liquid storage container 102 has flowed into the first liquid storage container 101. Then, the workers use the air intake machine connected to the air pipe 1012 to transport gas into the first liquid storage container 101. The gas entering the first liquid storage container 101 first enters the fracturing fluid in the first liquid storage container 101 (the gas entering the liquid will generate bubbles and move upward). As the bubbles move from the fracturing fluid on the lower side of the first liquid storage container 101 to the upper side, they agitate the fracturing fluid in the first liquid storage container 101, increase the mixing degree of the fracturing fluid, and increase the pressure of the fracturing fluid, thereby increasing the fracturing fluid's fracturing ability in coal mines.

[0039] Once the gas entering the first liquid storage container 101 reaches the required working value, the operator no longer supplies gas into the first liquid storage container 101 through the air intake fan connected to the air guide pipe 1012. The first electric push rod 1022 no longer moves the first sliding plate 1013 at its telescopic end. At this time, the first sliding plate 1013 is in contact with the upper side of the first liquid storage container 101 (e.g., ...). Figure 3 As shown, the one-way valves in the two first liquid guide pipes 1011 remain closed, and then the external liquid inlet of the second liquid guide pipe 1021 supplies fracturing fluid to the second liquid storage container 102. After the second liquid storage container 102 is filled with fracturing fluid, the external liquid inlet of the second liquid guide pipe 1021 stops supplying fracturing fluid to the second liquid storage container 102.

[0040] During water injection into the coal seam, workers remotely control the first electric push rod 1022 to push the first sliding plate 1013 at its telescopic end downwards. As the first sliding plate 1013 moves downwards, it compresses the gas inside the first liquid storage unit 101, increasing the pressure within it. When the pressure inside the first liquid storage unit 101 exceeds the threshold values ​​of the two pressure relief valves 1032, the fracturing fluid inside the first liquid storage unit 101 instantly opens the two pressure relief valves 1032, allowing the first liquid storage unit to... 101 is connected to two liquid guide cylinders 1031 and two liquid outlets 1033, so that the fracturing fluid in the first liquid storage container 101 instantly enters the two liquid guide cylinders 1031 and the two liquid outlets 1033. Through the instantaneous force generated above, a pulse is formed. Taking one of the liquid guide cylinders 1031 and the adjacent liquid outlet 1033 as an example, the fracturing fluid entering the liquid guide cylinder 1031 and the adjacent liquid outlet 1033 is ejected from the side of the liquid outlet 1033 near the hole, impacting the inner wall of the hole.

[0041] Because the diameter of the outlet component 1033 on the side closer to the hole is smaller than that on the side farther from the hole, the flow rate of fracturing fluid entering the mirror-distributed outlet component 1033 on the opposite side is greater than the flow rate of fracturing fluid exiting the mirror-distributed outlet component 1033 on the opposite side. This causes the outlet component 1033 to move towards the inner wall of the hole when it is ejected from the opposite side. During this movement, the adjacent sliding frame 1034 and sealing plate 1035 slide along the adjacent guide tube 1031. During the sliding process of frame 1034, the adjacent spring is squeezed. Through the cooperation of the inclined sliding groove on the outer periphery of liquid outlet 1033 and the adjacent limiting block 1037, the liquid outlet 1033 and the first spike 1036 rotate as they move towards the inner wall of the hole, so as to achieve the effect of breaking the soil. Through the contact between the first spike 1036 and the hole, the speed of the liquid outlet 1033 moving towards the inner wall of the hole is accelerated. Then, the fracturing fluid in the first liquid storage 101 is guided to the coal seam around the hole through the liquid outlet 1033, thereby realizing the deep water injection of the coal seam.

[0042] After the water injection into the coal seam in this area is completed, the staff uses a remote control terminal to stop the movement of the first sliding plate 1013 at the telescopic end of the first electric push rod 1022. At this time, the pressure in the first liquid storage component 101 is less than the threshold of the two pressure relief valves 1032. The two pressure relief valves 1032 block the opposing sides of the two liquid guide cylinders 1031, so that the first liquid storage component 101 is no longer connected to the two liquid outlet components 1033 and the liquid guide cylinders 1031. After the two liquid outlet components 1033 lose the impact of the fracturing fluid, under the action of the adjacent springs of the two sliding frames 1034, the two sliding frames 1034 drive the two liquid outlet components 1033 to move towards each other. During the process of the two liquid outlet components 1033 moving towards each other, they gradually detach from the contact with the coal seam and the hole.

[0043] Once the fracturing fluid in the first fluid storage unit 101 is emptied, the above injection process can be repeated.

[0044] Once the coal seam is no longer required to be injected with water, the staff can remove the device from the borehole using an external delivery device.

[0045] Example 2: Based on Example 1, such as Figure 3 , Figure 4 , Figure 7 and Figure 8As shown, it also includes a pre-wetting component, which is disposed within the rotating member 103. The pre-wetting component is used to pre-wet the coal seam. The pre-wetting component includes a fixing frame 202 fixed to the lower side of the first liquid storage member 101. The fixing frame 202 passes through the second sliding plate 1038 and is in a sealed sliding fit with it. The rotating member 103 is in a sealed rotational fit with the lower side of the first liquid storage member 101. A connecting frame 203 is fixed to the lower side of the fixing frame 202. The connecting frame 203 is located within the rotating member 103. Two third liquid storage members 203 are fixed to the connecting frame 203 and are distributed in a front-to-back mirror image. 4. A piston rod 205 is slidably connected to each of the two mirror-distributed third liquid storage components 204. Each piston rod 205 has a connecting hole, and a one-way valve is installed within this connecting hole. The one-way valve in the connecting hole of the piston rod 205 is open when the piston rod 205 slides downwards and closed when the piston rod 205 slides upwards. The upper side of the piston rod 205 is fixedly connected to the lower side of the second sliding plate 1038. The lower side of the third liquid storage component 204 is fixedly connected to and connected to the second sliding plate 1038 via a through-hole. A sealed sliding fit inlet pipe 206 is provided. A third liquid storage component 204 is connected to a first liquid storage component 101 via an adjacent inlet pipe 206, with the upper side of the inlet pipe 206 located inside the first liquid storage component 101. An outlet pipe 207, penetrating a second sliding plate 1038, is fixedly connected to and connected to the upper side of the third liquid storage component 204. The upper side of the outlet pipe 207 penetrates the first liquid storage component 101. A guide ring 208 is fixedly connected to the lower side of the first liquid storage component 101, located above two mirror-distributed guide cylinders 1031. The guide ring 208 is located within the mirror-distributed first guide pipe 1011. Below, the liquid guiding ring 208 is provided with a ring array of liquid outlet holes 209. The liquid outlet holes 209 located on the outer periphery of the liquid guiding ring 208 and arranged in a ring array are all set to be inclined downwards to impact the coal seam. The fracturing fluid sprayed through the liquid outlet holes 209 wets the inner wall of the hole. Under the action of the downwardly inclined distribution of the liquid outlet holes 209, the wetted area of ​​the hole by the fracturing fluid is increased. The second sliding plate 1038 is sealed and slidably engaged with the rotating part 103. A spring for resetting the second sliding plate 1038 is provided between the second sliding plate 1038 and the rotating part 103.

[0046] like Figures 7-9As shown, it also includes a drive assembly, which is disposed within the rotating member 103. The drive assembly is used to drive the rotating member 103 to rotate. The drive assembly includes a rotating member 301 that is rotatably connected to the rotating member 103 with a limit. The rotating member 301 is rotatably engaged with the connecting frame 203. A torsion spring is provided between the rotating member 301 and the rotating member 103 to drive the rotating member 103 to rotate. An elastic member 302 distributed in a ring array is fixedly connected to the upper side of the connecting frame 203. The elastic member 302 is a C-shaped elastic tab. A sliding ring 303 is slidably connected to the lower side of the fixed frame 202. The sliding ring 303 is fixedly connected to the lower side of the second sliding plate 1038 through a mirror-distributed connecting rod. A limit pin 3031 distributed in a ring array is fixedly connected to the sliding ring 303. The elastic members 302 distributed in a ring array are slidably engaged with adjacent limit pins 3031. A limit frame 303 is fixedly connected to the side of the rotating member 301 away from the connecting frame 203. 04. The limiting frame 304 is provided with vertical and inclined sides arranged in a ring array. The elastic element 302 is located below the adjacent vertical side of the limiting frame 304. The limiting pins 3031 arranged in the ring array are all in a limiting sliding fit with the limiting frame 304. The limiting frame 304 is located above the elastic element 302 in the ring array. When the limiting pin 3031 presses the adjacent elastic element 302, the elastic element 302 deforms, causing the limiting pin 3031 to disengage from the adjacent elastic element 302 and the adjacent vertical side of the limiting frame 304, so that the limiting pin 3031 contacts the adjacent inclined side of the limiting frame 304. When the limiting pin 3031 moves upward, the limiting pin 3031 drives the limiting frame 304 to rotate. During the rotation of the limiting frame 304, the adjacent torsion spring is tightened. The elastic force released by the torsion spring drives the rotating element 103 to rotate, so as to achieve the direction of self-adjusting the spraying of the two liquid outlet elements 1033.

[0047] When water is injected into the coal seam, the first electric push rod 1022 drives the first sliding plate 1013 to move downward within the first liquid storage container 101 and squeezes the fracturing fluid inside. After being pressurized, the fracturing fluid in the first liquid storage container 101 squeezes the second sliding plate 1038 downward. During the downward movement of the second sliding plate 1038, it squeezes the adjacent spring. The second sliding plate 1038 drives the sliding ring 303, the ring array of limiting pins 3031, and the two piston rods 205 to move downward.

[0048] Taking the movement of one of the piston rods 205 as an example (since the third liquid storage component 204 is connected to the first liquid storage component 101 through the adjacent liquid inlet pipe 206, the fracturing fluid in the first liquid storage component 101 will be introduced into the adjacent third liquid storage component 204 through the adjacent liquid inlet pipe 206), during the downward movement of the piston rod 205, the one-way valve inside is opened, so that the fracturing fluid in the third liquid storage component 204 flows through the connecting hole of the adjacent piston rod 205 and gradually flows into the space between the upper side of the adjacent piston rod 205 and the lower side of the adjacent third liquid storage component 204, so as to realize the transfer of fracturing fluid. When the lower side of the piston rod 205 is in contact with the lower side inside the adjacent third liquid storage component 204, the second sliding plate 1038 has moved to the limit position.

[0049] As the sliding ring 303 moves downward, it drives the limiting pins 3031 distributed in the ring array to slide along the vertical side of the limiting frame 304. When the limiting pins 3031 of the ring array are between the elastic members 302 of the ring array, the limiting pins 3031 of the ring array are located on the lower side of the limiting frame 304 between the elastic members 302 of the ring array. As the sliding ring 303 moves downward, the limiting pins 3031 of the ring array compress the elastic members 302 of the ring array. The elastic element 302 of the ring array is deformed, creating space for the limiting pin 3031 of the ring array to move downward. When the limiting pin 3031 of the ring array moves downward and no longer contacts the upper side of the elastic element 302 of the ring array, the elastic element 302 of the ring array is reset, providing a reversal for the limiting pin 3031 of the ring array to move upward, changing the contact position between the limiting pin 3031 of the ring array and the limiting frame 304, and converting the contact on the vertical side to the contact on the inclined side.

[0050] After the water injection into the coal seam is completed, the first electric push rod 1022 no longer drives the first sliding plate 1013 to move. The second sliding plate 1038 moves upward and resets under the action of the spring. The second sliding plate 1038 drives the sliding ring 303, the ring array of limiting pins 3031, and the two piston rods 205 to move upward. Taking the movement of one of the piston rods 205 as an example, the one-way valve inside the piston rod 205 is closed during the upward movement. The piston rod 205 moves upward and pushes the fracturing fluid in the upper side and the adjacent third liquid storage device 204 into the adjacent liquid outlet pipe 207. The liquid outlet pipe 207 transports the fracturing fluid to the guide ring 208 and sprays it out from the ring array of liquid outlet holes 209 on the guide ring 208 to wet the inner wall of the hole, so that the two liquid outlet devices 1033 can drill into the inner wall of the hole. Under the action of the downwardly inclined distribution of the liquid outlet holes 209, the wetted area of ​​the hole by the fracturing fluid is increased.

[0051] As the sliding ring 303 and the ring-shaped array of limiting pins 3031 move upward, the ring-shaped array of limiting pins 3031 slides upward along the inclined side of the limiting frame 304, causing the limiting frame 304 to rotate. During the rotation of the limiting frame 304, the rotating component 301 rotates, and the rotating component 301 tightens the adjacent torsion spring. Since the two liquid outlets 1033 gradually move away from the hole at this time, and the two liquid outlets 1033 have not broken contact with the hole, the hole still limits the two liquid outlets 1033, thereby limiting the rotating component 103 so that it will not rotate under the action of the torsion spring's release force. When the two liquid outlets 1033 break contact with the hole, the rotating component 103 drives the parts on it to rotate under the action of the torsion spring, thereby adjusting the water injection position of the two liquid outlets 1033, avoiding the two liquid outlets 1033 from fixing the water injection position of the coal seam too much, which would cause excessive injection in the water-injected area of ​​the coal seam, thus causing a collapse.

[0052] Example 3: Based on Example 2, such as Figure 1 , Figure 3 and Figure 10 As shown, it also includes a fall protection component, which is disposed on the upper side of the first liquid storage component 101. The fall protection component is used to prevent the first liquid storage component 101 from falling. The fall protection component includes two first sliding members 401 that are mirror-distributed to the left and right. The opposing sides of the two mirror-distributed first sliding members 401 are provided with inclined surfaces. The mirror-distributed first sliding members 401 are slidably connected to the top of the second liquid storage component 102. A spring for resetting the first sliding member 401 is provided between the first sliding member 401 and the second liquid storage component 102. The opposing sides of the two mirror-distributed first sliding members 401 are slidably connected to the second sliding members 402. The opposing sides of the mirror-distributed second sliding members 402 are fixedly connected with second spikes 403 arranged in a rectangular array. All spikes 403 are set to a downward tilted state. The first sliding member 401 is fixed in the hole by the contact between the second spike 403 and the hole. The second liquid storage member 102 is provided with a control component, which is used to drive the mirror-distributed first sliding members 401 to slide. A spring is provided between the second sliding member 402 and the adjacent first sliding member 401. The spring is used to provide buffer for the adjacent first sliding member 401. Through the relative movement of the second sliding member 402 and the first sliding member 401, and by squeezing the adjacent spring, a flexible buffer is provided for the fall of the second liquid storage member 102 and its parts, so as to avoid the second spike 403 piercing into the hole instantly, causing the second liquid storage member 102 and its parts to suddenly jerk, so as to affect the parts inside the second liquid storage member 102.

[0053] like Figure 1 and Figure 10As shown, the control component includes a second electric push rod 501 disposed on the upper side of the second liquid storage component 102. The second electric push rod 501 is electrically connected to a remote control terminal. A third sliding member 502 is fixedly connected to the telescopic end of the second electric push rod 501. The third sliding member 502 is provided with two inclined surfaces that are mirror-distributed to the left and right. The two inclined surfaces that are mirror-distributed to the left and right on the third sliding member 502 respectively cooperate with the inclined surfaces of the adjacent first sliding members 401. When the inclined surfaces of the third sliding member 502 press against the inclined surfaces of the two first sliding members 401, the two first sliding members 401 move in opposite directions.

[0054] During the process of injecting water into the coal seam using this device, if the external delivery device malfunctions and disconnects from the device, the device will fall downwards along the hole. At this time, the operator will use a remote control terminal to operate the second electric push rod 501 to pull the third sliding member 502 downwards. As the third sliding member 502 moves downwards, it will press the inclined surfaces of the two first sliding members 401 on opposite sides through the inclined surfaces on both sides, causing the two first sliding members 401 to move in opposite directions. During the movement of the first sliding members 401, the adjacent springs will be stretched.

[0055] Taking the movement of one of the first sliding members 401 as an example, the first sliding member 401 drives the adjacent second sliding member 402 and the second spikes 403 distributed in a rectangular array on it to move towards one side of the hole. When the second spikes 403 contact the hole, they gradually reduce the downward speed of the second liquid storage member 102 and its parts. Under the tilting action of the second spikes 403, they insert into the hole and fix the adjacent second sliding member 402. After the second spikes 403 insert into the hole, the second liquid storage member 102 and its parts are still in a downward falling state. By moving the second slider 402 relative to the first slider 401 and squeezing the adjacent spring, a flexible buffer is provided for the fall of the second liquid storage component 102 and its parts, preventing the second spike 403 from instantly piercing the hole and causing the second liquid storage component 102 and its parts to momentarily jerk, thus affecting the parts inside the second liquid storage component 102. When the spring adjacent to the second slider 402 is squeezed to its limit, the second liquid storage component 102 and its parts no longer fall downwards, thereby completing the fixation of the second liquid storage component 102 and its parts.

[0056] After the second liquid storage component 102 and its parts are fixed in the hole, the staff retrieves the device. During the retrieval process, the staff reconnects the new delivery device to the device. After the connection is completed, the staff operates the delivery device to pull the device upward, causing the second spike 403 to disengage from the hole. Then, the staff operates the second electric push rod 501 through the control terminal to push the third sliding member 502 upward, so that the two inclined surfaces of the third sliding member 502 no longer contact the inclined surfaces of the two first sliding members 401 facing each other. The two first sliding members 401 move towards each other under the action of adjacent springs, and the two second sliding members 402 move downward to reset under the action of adjacent springs.

[0057] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A high-pressure pulse water injection device for coalbed methane extraction, characterized in that, The system includes a first liquid storage component (101), to which a second liquid storage component (102) is fixedly connected. The second liquid storage component (102) is fixedly connected to and connected to a mirror-distributed first liquid guide tube (1011) on the side closest to the first liquid storage component (101). A one-way valve is installed inside the first liquid guide tube (1011). The sides of the mirror-distributed first liquid guide tubes (1011) away from the second liquid storage component (102) are all fixedly connected to and connected to the side of the first liquid storage component (101) away from the second liquid storage component (102). A venting tube (1012) is fixedly connected to and connected to the side of the first liquid storage component (101) away from the second liquid storage component (102). The venting tube (1012) penetrates the second liquid storage component (102) and is fixedly connected to it. A first sliding plate (1013) is slidably connected inside the liquid storage component (101). A second liquid storage component (102) is fixedly connected to and connected to a second liquid guide tube (1021) on the side away from the first liquid storage component (101). The second liquid storage component (102) is provided with a first electric push rod (1022) electrically connected to a remote control terminal. The telescopic end of the first electric push rod (1022) passes through the first liquid storage component (101) and is fixedly connected to the first sliding plate (1013). A rotating component (103) is provided on the side of the first liquid storage component (101) away from the second liquid storage component (102). A mirror-distributed liquid guide tube (1031) is fixedly connected to the rotating component (103). A pressure relief valve (1032) is provided on the opposite sides of the mirror-distributed liquid guide tube (1031).

2. The high-pressure pulse water injection device for coalbed methane extraction according to claim 1, characterized in that, Each of the mirror-distributed liquid guide tubes (1031) is slidably connected to a liquid outlet (1033), and the diameter of the holes on the opposite side of the mirror-distributed liquid outlets (1033) is larger than the diameter of the holes on the opposite side.

3. A high-pressure pulse water injection device for coalbed methane extraction according to claim 2, characterized in that, Both the first liquid storage component (101) and the second liquid storage component (102) are fixedly connected to the outer periphery of a ring-shaped array of guide wheels (1023). The mirror-distributed liquid guide cylinders (1031) are slidably connected to opposing sides by sliding frames (1034). A spring is provided between the sliding frame (1034) and the rotating component (103). The sliding frame (1034) rotates with the adjacent liquid outlet component (1033). The mirror-distributed pressure relief valves (1032) are all located between the mirror-distributed sliding frames (1034). The sliding frame (1034) is fixedly connected to the adjacent liquid guide cylinder (1031) and slides with it. The sealing plate (1035) is matched with the liquid outlet (1033) which is mirror-distributed. The back side of each of the liquid outlet (1033) is fixed with a first spike (1036) distributed in a ring array. The rotating part (103) is fixed with a limiting block (1037) which is mirror-distributed in a ring array. The outer periphery of the liquid outlet (1033) is provided with a slanted sliding groove distributed in a ring array. The slanted sliding groove on the outer periphery of the liquid outlet (1033) is slidably engaged with the adjacent limiting block (1037). The rotating part (103) is provided with a second sliding plate (1038). The second sliding plate (1038) is located below the liquid guide cylinder (1031) which is mirror-distributed.

4. A high-pressure pulse water injection device for coalbed methane extraction according to claim 3, characterized in that, It also includes a pre-wetting component, which is disposed within the rotating member (103). The pre-wetting component is used to pre-wet the coal seam. The pre-wetting component includes a fixing frame (202), which is fixed to the side of the first liquid storage member (101) near the rotating member (103). The side of the fixing frame (202) away from the first liquid storage member (101) passes through the second sliding plate (1038) and slides with it. The fixing frame (202) is located at... A connecting frame (203) is fixedly connected to one side of the rotating component (103). The connecting frame (203) is fixedly connected to mirror-distributed third liquid storage components (204). Each mirror-distributed third liquid storage component (204) is slidably connected to a piston rod (205). Each piston rod (205) has a connecting hole, and a one-way valve is installed within the connecting hole. The side of the piston rod (205) away from the connecting frame (203) is fixedly connected to the second sliding plate (1038). The third liquid storage component... The liquid component (204) is fixedly connected to and connected to an inlet pipe (206) on the side near the connecting frame (203). The inlet pipe (206) passes through and slides with the second sliding plate (1038). The third liquid storage component (204) is connected to the first liquid storage component (101) through the adjacent inlet pipe (206). The side of the third liquid storage component (204) away from the connecting frame (203) is fixedly connected to and connected to a pipe that passes through the second sliding plate (1038) and the first liquid storage component (101). The liquid outlet pipe (207) of the first liquid storage component (101) is fixedly connected to a liquid guide ring (208) on the side of the first liquid storage component (101) near the rotating component (103). The liquid guide ring (208) is located below the mirror-distributed first liquid guide pipe (1011). The liquid guide ring (208) is provided with liquid outlet holes (209) distributed in a ring array. The second sliding plate (1038) is slidably engaged with the rotating component (103). A spring is provided between the second sliding plate (1038) and the rotating component (103).

5. A high-pressure pulse water injection device for coalbed methane extraction according to claim 4, characterized in that, The outlet holes (209) located on the outer periphery of the liquid guiding ring (208) and distributed in a ring array are all set in an inclined state for impacting the coal seam.

6. A high-pressure pulse water injection device for coalbed methane extraction according to claim 4, characterized in that, It also includes a drive assembly disposed within the rotating member (103). The drive assembly is used to drive the rotating member (103) to rotate. The drive assembly includes a rotating member (301) rotatably connected to the rotating member (103). The rotating member (301) rotatably engages with the connecting frame (203). A torsion spring is provided between the rotating member (301) and the rotating member (103). The connecting frame (203) is fixedly connected with elastic members (302) arranged in a ring array. The fixed frame (202) is slidably connected to a sliding member on the side near the connecting frame (203). The moving ring (303) is fixed to the second sliding plate (1038) via mirror-distributed connecting rods. The sliding ring (303) is fixed with a ring array of limiting pins (3031). The ring array of elastic members (302) slides with the adjacent limiting pins (3031). The rotating member (301) is fixed with a limiting frame (304) on the side away from the connecting frame (203). The ring array of limiting pins (3031) all cooperate with the limiting frame (304). The limiting frame (304) is located above the ring array of elastic members (302).

7. A high-pressure pulse water injection device for coalbed methane extraction according to claim 4, characterized in that, It also includes a fall protection component, which is disposed on the side of the first liquid storage component (101) away from the rotating component (103). The fall protection component is used to prevent the first liquid storage component (101) from falling. The fall protection component includes a mirror-distributed first sliding component (401). The mirror-distributed first sliding component (401) is slidably connected to the side of the second liquid storage component (102) away from the first liquid storage component (101). A spring is provided between the first sliding component (401) and the second liquid storage component (102). The back side of the mirror-distributed first sliding component (401) is slidably connected to a second sliding component (402). The back side of the mirror-distributed second sliding component (402) is fixed with a rectangular array of second spikes (403). The second liquid storage component (102) is provided with a control component, which is used to drive the mirror-distributed first sliding component (401) to slide.

8. A high-pressure pulse water injection device for coalbed methane extraction according to claim 7, characterized in that, The second spikes (403) distributed in a rectangular array are all set to an inclined state to fix the adjacent first sliders (401).

9. A high-pressure pulse water injection device for coalbed methane extraction according to claim 7, characterized in that, A spring is provided between the second slider (402) and the adjacent first slider (401), and the spring is used to provide cushioning for the adjacent first slider (401).

10. A high-pressure pulse water injection device for coalbed methane extraction according to claim 7, characterized in that, The control component includes a second electric push rod (501), which is located on the side of the second liquid storage component (102) away from the first liquid storage component (101). The second electric push rod (501) is electrically connected to a remote control terminal. A third sliding member (502) is fixedly connected to the telescopic end of the second electric push rod (501). The third sliding member (502) is provided with mirror-distributed inclined surfaces. The opposing sides of the mirror-distributed first sliding member (401) are each provided with inclined surfaces that are respectively pressed and engaged with the mirror-distributed inclined surfaces of the third sliding member (502).

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