A coal seam permeability improvement nanofluid and active agent combined injection device

Abstract

The application relates to the field of coal mining, and discloses a nano-fluid and active agent combined injection device for coal seam permeability improvement, which comprises a mounting frame, a pumping box is fixedly connected to the front side of the mounting frame, a first container and a second container are arranged at the bottom end of the rear side of the mounting frame, a gas pump is fixedly connected to the top of the rear side of the mounting frame, a partition plate is vertically arranged in the middle of the pumping box to form a chamber one and a chamber two, the top of the chamber one and the chamber two are communicated, a piston block is slidably connected in the chamber one and the chamber two, two vertical pipes are slidably connected to the top of the pumping box, the bottom end of the vertical pipes extends to the chamber one and the chamber two respectively, and a height adjusting mechanism is arranged at the top of the pumping box. The nano-fluid and the active agent are combined to be injected in a precise manner, the permeability improvement effect and benefit are improved, the two are combined to synergistically improve the permeability, the limitation of a single method is broken, and a more efficient and more reliable technical means is provided for coal seam permeability improvement.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, in particular to a device for jointly injecting nanofluid and active agent for increasing the permeability of coal seams. Background Art

[0002] As an important energy resource, coal occupies a key position in the global energy structure. However, the low permeability of coal seams poses a huge challenge to coal mining and coalbed methane development. To improve the permeability of coal seams, traditional coal seam permeability enhancement methods are widely used, but these methods often have limited effectiveness or obvious drawbacks. For example, although blasting permeability enhancement can increase coal seam permeability to a certain extent, it has disadvantages such as high safety risks and significant damage to coal seam structure; hydraulic fracturing permeability enhancement may lead to water resource waste and environmental pollution, and the permeability enhancement effect is unstable. At the same time, a single physical or chemical permeability enhancement method is usually difficult to fully meet the permeability enhancement needs under different coal seam conditions.

[0003] With the advancement of technology, nanofluids and active agents have begun to be introduced into the field of coal seam permeability enhancement. Nanoparticles in nanofluids possess unique properties, such as small size effects, which theoretically allow them to penetrate deep into the tiny pores of coal seams, transforming and expanding their structure. Active agents, on the other hand, can reduce the surface tension of the fluid and enhance its permeability. However, existing technologies often apply nanofluids and active agents independently, failing to fully exploit their synergistic effects.

[0004] On the one hand, when using nanofluids alone for coal seam permeability enhancement, the lack of an active agent limits the diffusion and effectiveness of the nanoparticles within the coal seam, making it difficult to fully transform the pore structure. On the other hand, when using active agents alone for permeability enhancement, the lack of nanoparticle support results in unsatisfactory penetration depth and permeability enhancement results.

[0005] In addition, the existing coal seam permeability enhancement technology lacks effective control measures for the combined injection of nanofluids and active agents, and is unable to accurately adjust the ratio, injection speed, and pressure of nanofluids and active agents according to the characteristics and needs of different coal seams, resulting in unstable permeability enhancement effects and poor adaptability. It may also cause waste of resources and increased costs. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present invention provides a device for combining nanofluid and active agent injection for coal seam permeability enhancement, which solves the problems of limited effect and drawbacks of traditional coal seam permeability enhancement methods.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for the combined injection of nanofluids and active agents for coal seam permeability enhancement, comprising a mounting frame, a pumping box fixedly connected to the front side of the mounting frame, a first container and a second container respectively provided at the bottom end of the rear side of the mounting frame, an air pump fixedly connected to the top of the rear side of the mounting frame, a partition vertically provided in the middle of the pumping box to form chamber one and chamber two, and the tops of chamber one and chamber two are connected, piston blocks are slidably connected in chamber one and chamber two, the top of the pumping box is slidably connected to two vertical pipes, the bottom ends of the vertical pipes extend to chamber one and chamber two respectively, and the pumping A height adjustment mechanism is provided on the top of the box and is connected to the vertical pipe. The top of the vertical pipe is provided with an end cap. The bottom of one side of chamber one and chamber two are connected to the bottom of one side of the first container and the second container respectively through a liquid inlet pipe. Nanofluid is provided in the first container, and active agent is provided in the second container. The air outlet of the air pump is connected to the main air pipe, and the main air pipe is connected to the two ends through two connecting hoses. The front bottoms of chamber one and chamber two are connected to the opposite ends of the tee through a liquid outlet pipe. A one-way valve 1 is provided on the liquid outlet pipe. The vertical end of the tee is connected to an injection pipe, and a one-way valve 2 is provided on the injection pipe.

[0008] Preferably, the height adjustment mechanism includes a top frame and a sliding lock box, the top frame is fixedly connected to the top of the pumping box, the inner middle part of the top frame is fixedly connected to the frame rod, and a plurality of corresponding card slots are equidistantly provided on both sides of the top frame and the frame rod, the sliding lock box is fixedly connected to the outer side of the vertical tube near the top, the left and right sides of the sliding lock box are provided with inner slide grooves, the upper and lower sides of the inner slide grooves are provided with transverse slide grooves, and the transverse slide grooves pass through the sliding lock box, and the middle and rear sides of the sliding lock box are rotatably connected to the grip rod, the rod wall of the grip rod is provided with vertical slide grooves, the inner slide grooves are slidably connected with plug blocks, the adjacent sides of the plug blocks are provided with springs, the plug blocks are fixedly connected to the central axis rod, the two ends of the central axis rod respectively pass through the corresponding transverse slide grooves and extend into the vertical slide grooves, and the plug blocks are engaged with the card slots.

[0009] Preferably, a sealing ring is provided at the sliding connection between the pumping box and the vertical pipe, and a plug is provided at the top end of each piston block, and the plugs respectively correspond to the bottom ends of the vertical pipes.

[0010] Preferably, both sides of the chamber 1 and the chamber 2 are fixedly connected with limit plates located above the liquid inlet pipe and the liquid outlet pipe near the bottom.

[0011] Preferably, a scale is provided on the front side of the rack, and two liquid level windows are vertically provided on the front side of the pumping box, and the liquid level windows correspond to chamber one and chamber two respectively.

[0012] Preferably, a liquid infusion port is provided on the top of one side of the first container and the second container, and a sealing cover is threadedly connected to the liquid infusion port, and a pressure relief valve is provided on the top of the first container and the second container.

[0013] Preferably, a connecting frame is fixedly connected to the middle of the rear side of the mounting frame, the front side of the connecting frame is fixed to the top frame, and a hanger is provided on the main air pipe, and the hanger is fixedly connected to the inner top end of the connecting frame.

[0014] Preferably, the nanofluid is one or more of nanoalumina fluid, nanosilver fluid and carbon nanotube fluid.

[0015] Preferably, the active agent is one or more of sodium alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether and cocamidopropyl betaine.

[0016] Working principle: First, lower the injection pipe into the coal seam that needs to be permeable, then add nanofluid and active agent into the first container and the second container respectively, drive the air pump to exhaust and let the piston blocks in chamber one and chamber two sink to the bottom position, determine the injection ratio of nanofluid and active agent according to the characteristics and needs of the coal seam, and adjust the suction amount of nanofluid and active agent by controlling the height of the two vertical pipes to control the injection ratio, pinch the two handles and slide the lock box to adjust the height of the vertical pipe, release the handle and insert the block into the slot of the corresponding height to fix it, and after fixing the two vertical pipes, drive the air pump to inhale. At this time, the piston block rises due to the negative pressure generated at the top, and the nanofluid and active agent are sucked into chamber one and chamber two at the same time. When the two piston blocks rise to contact with the corresponding vertical pipes, they stop. Finally, control the air pump to discharge air, and the air pressure simultaneously pushes the piston block to synchronously squeeze out the nanofluid and active agent in chamber one and chamber two, and inject them into the coal seam through the liquid outlet pipe and the injection pipe.

[0017] The present invention provides a device for combined injection of nanofluid and active agent for increasing coal seam permeability. It has the following beneficial effects:

[0018] 1. The present invention achieves precise control over the combined injection of nanofluids and active agents, and can adjust the ratio of nanofluids and active agents, injection speed, and pressure according to the characteristics and requirements of different coal seams. This ensures that the optimal permeability enhancement effect can be achieved under different coal seam conditions, thereby improving the adaptability and practicality of the device. At the same time, precise control of the injection process can also reduce waste, lower costs, and improve the economic and environmental benefits of coal seam permeability enhancement.

[0019] 2. The present invention combines nanofluids with active agents, utilizing the unique properties of nanoparticles in the nanofluid to penetrate deep into the tiny pores of the coal seam, transforming and expanding the pore structure. At the same time, the active agent reduces the surface tension of the fluid and improves the permeability. The two work synergistically to greatly improve the permeability of the coal seam. This synergistic permeability enhancement mechanism breaks through the limitations of a single permeability enhancement method and provides a more efficient and reliable technical means for coal seam permeability enhancement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front perspective of the stereogram of the present invention;

[0021] Figure 2 This is the back perspective of the stereogram of the present invention;

[0022] Figure 3 Schematic diagram of the internal structure of the pumping box of the present invention;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the sliding lock box of the present invention;

[0024] Figure 5 It is a three-dimensional exploded view of the slide lock box of the present invention.

[0025] Among them, 1. Pumping box; 101. Chamber 1; 102. Chamber 2; 2. Mounting frame; 3. First container; 4. Liquid inlet pipe; 5. One-way valve 1; 6. Liquid filling port; 7. Air pump; 8. One-way valve 2; 9. Injection pipe; 10. Tee; 11. Liquid outlet pipe; 12. Liquid level window; 13. Top frame; 14. Rack rod; 15. Connecting frame; 16. Card slot; 17. Terminal; 18. Slide lock box ; 19. Vertical pipe; 20. Connecting hose; 21. Hanger; 22. Second container; 23. Main air pipe; 24. Pressure relief valve; 25. Scale; 26. Partition; 27. Limit plate; 28. Piston block; 29. ​​Plug; 30. Inner slide; 31. Sealing ring; 32. Insert; 33. Handle rod; 34. Vertical slide; 35. Center axis rod; 36. Horizontal slide; 37. Spring. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Please see the attached Figure 1 - Attachment Figure 2, an embodiment of the present invention provides a device for jointly injecting nanofluids and active agents for coal seam permeability enhancement, including a mounting frame 2, a pumping box 1 being fixedly connected to the front side of the mounting frame 2, a first container 3 and a second container 22 being respectively provided at the bottom end of the rear side of the mounting frame 2, a liquid replenishing port 6 being provided on one side top of the first container 3 and the second container 22, and a sealing cover being threadedly connected to the liquid replenishing port 6, a pressure relief valve 24 being provided on the top of the first container 3 and the second container 22, the pressure relief valve 24 balances the air pressure in the first container 3 and the second container 22 when the nanofluid and the active agent are extracted, ensuring that the nanofluid and the active agent can be smoothly extracted when the sealing cover seals the liquid replenishing port 6, an air pump 7 being fixedly connected to the top of the rear side of the mounting frame 2, the air pump 7 being a variable frequency speed regulating air pump 7, and the speed and pressure of the gas outlet can be controlled by adjusting the speed of the air pump 7 and the flow control valve, a partition 26 is vertically provided in the middle part of the inner part of the pumping box 1 to form a chamber 101 and a chamber 102. The chamber 101 and the chamber 2 102 are connected at the top, and the piston blocks 28 are slidably connected in the chamber 101 and the chamber 2 102. The top of the piston blocks 28 are provided with plugs 29. The connected chamber 101 and the chamber 2 102 make the gas output by the air pump 7 keep the same pressure after entering the chamber 101 and the chamber 2 102, pushing the piston blocks 28 to squeeze downward synchronously, realizing the synchronous joint infusion of the nanofluid and the active agent, and the pumping box 1 is slidably connected to two vertical pipes 19 at the top. A sealing ring 31 is provided at the sliding connection between the pumping box 1 and the vertical pipe 19 to increase the airtightness of the vertical pipe 19 and the pumping box 1. The bottom ends of the vertical pipes 19 extend to chamber 1 101 and chamber 2 102 respectively. The plugs 29 correspond to the bottom ends of the vertical pipes 19 respectively. When the piston block 28 rises, the plug 29 blocks the bottom end of the vertical pipe 19 and the corresponding piston block 28 stops moving. A height adjustment mechanism is provided on the top of the pumping box 1.

[0028] The top of each vertical tube 19 is provided with an end cap 17, which serves to seal the top of the vertical tube 19. The bottom of one side of chamber 101 and chamber 2 102 are respectively connected to the bottom of one side of the first container 3 and the second container 22 through a liquid inlet pipe 4. A nanofluid is provided in the first container 3, and an active agent is provided in the second container 22. The nanofluid is one of nanoalumina fluid, nanosilver fluid and carbon nanotube fluid, and the active agent is one of sodium alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether and cocamidopropyl betaine.

[0029] Nano-alumina fluid: Nano-alumina particles have a high hardness, which can support coal seam pores to a certain extent and prevent them from closing. At the same time, alumina has good thermal and chemical stability, making it suitable for various coal seam environments.

[0030] Nanosilver fluid: Nanosilver has antibacterial properties, which can reduce the impact of microorganisms on coal seams during the coal seam permeability enhancement process. Furthermore, silver has excellent electrical conductivity, which may have a certain effect on electron transfer in coal seams, thereby affecting the physical properties of coal seams.

[0031] Carbon nanotube fluid: Carbon nanotubes possess extremely high strength and unique electrical and thermal properties. Their small size and high aspect ratio allow them to penetrate deep into the tiny pores of coal seams, reinforcing and transforming the pore structure and improving the permeability of coal seams.

[0032] Sodium alkylbenzene sulfonate: A common anionic surfactant with good surface activity and emulsifying properties. It can effectively reduce the surface tension of nanofluids and improve their penetration into coal seams.

[0033] Fatty alcohol polyoxyethylene ether: A nonionic surfactant with low foaming and high detergency. It can improve the interfacial properties between nanofluids and coal seams during coal seam permeability enhancement, promoting nanofluid penetration. Cocamidopropyl betaine: An amphoteric surfactant, it combines the advantages of both anionic and cationic surfactants. It exhibits excellent surface activity under varying coal seam conditions, enhancing the penetration of nanofluids.

[0034] The air outlet of the air pump 7 is connected to the main air pipe 23, which is connected to the two end heads 17 through two connecting hoses 20. The front bottoms of chamber 101 and chamber 2 102 are connected to the opposite ends of the tee 10 through the liquid outlet pipe 11. The liquid outlet pipe 11 is provided with a one-way valve 15. The one-way valve 15 prevents the nanofluid and active agent in chamber 101 and chamber 2 102 from flowing back due to air pressure. The vertical end of the tee 10 is connected to the injection pipe 9. The injection pipe 9 is provided with a one-way valve 2 8. The one-way valve 2 8 seals the injection pipe 9 when chamber 1 101 and chamber 2 102 inhale the nanofluid and active agent, so that the nanofluid and active agent can be smoothly inhaled into chamber 1 101 and chamber 2 102.

[0035] Limit plates 27 are fixedly connected to both sides of chamber 1 101 and chamber 2 102 near the bottom, above the liquid inlet pipe 4 and the liquid outlet pipe 11, to limit the minimum height of the piston block 28 and prevent the piston block 28 from sinking to the bottom and blocking the liquid inlet pipe 4 and being unable to be sucked up. A scale ruler 25 is provided on the front side of the rack 14 for observing and measuring the fixed height of the vertical pipe 19. Two liquid level windows 12 are vertically provided on the front side of the pumping box 1, and the liquid level windows 12 correspond to chamber 1 101 and chamber 2 102 respectively.

[0036] Please see the attached Figure 3 - Attachment Figure 5The height adjustment mechanism includes a top frame 13 and a slide lock box 18. The top frame 13 is fixedly connected to the top of the pumping box 1. The middle part of the inner side of the top frame 13 is fixedly connected to the rack rod 14. A plurality of corresponding card slots 16 are equidistantly provided on both sides of the top frame 13 and the rack rod 14. The slide lock box 18 is fixedly connected to the outer side of the vertical pipe 19 near the top. The left and right sides of the slide lock box 18 are provided with inner slide grooves 30. The upper and lower sides of the inner slide groove 30 are provided with horizontal slide grooves 36, and the horizontal The lateral slide grooves 36 all pass through the slide lock box 18, and the handle rods 33 are rotatably connected on both sides of the middle and rear part of the slide lock box 18. Vertical slide grooves 34 are opened on the rod wall of the handle rod 33. Insert blocks 32 are slidably connected in the inner slide grooves 30, and springs 37 are provided on the adjacent sides of the insert blocks 32. A central axis rod 35 is fixedly connected to the insert blocks 32. The two ends of the central axis rod 35 respectively pass through the corresponding horizontal slide grooves 36 and extend into the vertical slide grooves 34. The insert blocks 32 are engaged with the card slots 16.

[0037] Pinch the two handle rods 33, and the vertical slide groove 34 pulls the two central axis rods 35 and the insert block 32 to slide inward, and the insert block 32 disengages from the corresponding slot 16. At this time, the sliding lock box 18 adjusts the height of the vertical pipe 19. After loosening the handle rods 33, the insert block 32 is snapped into the slot 16 of the corresponding height and fixed. The injection ratio of the nanofluid and the active agent is determined according to the characteristics and needs of the coal seam. The height of the vertical pipe 19 is proportional to the intake amount of the nanofluid and the active agent. The height of the vertical pipe 19 is adjusted by the height adjustment mechanism to control the ratio of the nanofluid and the active agent inhaled into chamber 1 101 and chamber 2 102.

[0038] A connecting frame 15 is fixedly connected to the middle of the rear side of the mounting frame 2, and the front side of the connecting frame 15 is fixed to the top frame 13. A hanger 21 is provided on the main air pipe 23, and the hanger 21 is fixedly connected to the inner top end of the connecting frame 15 to suspend the main air pipe 23 to prevent the pipes from stacking and bending and affecting the air intake and exhaust of the air pump 7.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for injecting nanofluid and active agent for coal seam permeability enhancement, comprising a mounting frame (2), characterized in that: The front side of the mounting frame (2) is fixedly connected to a pumping box (1), the bottom end of the rear side of the mounting frame (2) is respectively provided with a first container (3) and a second container (22), the top of the rear side of the mounting frame (2) is fixedly connected to an air pump (7), a partition (26) is vertically provided in the middle of the inner part of the pumping box (1) to form chamber one (101) and chamber two (102), and the tops of chamber one (101) and chamber two (102) are connected, and piston blocks (28) are slidably connected in chamber one (101) and chamber two (102), the top of the pumping box (1) is slidably connected to two vertical pipes (19), the bottom ends of the vertical pipes (19) extend to chamber one (101) and chamber two (102), respectively, the top of the pumping box (1) is provided with a height adjustment mechanism, and is connected to the vertical pipe (19), The top of each vertical tube (19) is provided with an end cap (17), and the bottom of each side of each chamber (101) and chamber (102) is connected to the bottom of each side of each first container (3) and second container (22) respectively through a liquid inlet pipe (4), the first container (3) is provided with a nanofluid, and the second container (22) is provided with an active agent, the air outlet of the air pump (7) is connected to a main air pipe (23), and the main air pipe (23) is connected to the two end caps (17) through two connecting hoses (20), the front bottoms of each chamber (101) and chamber (102) are connected to the opposite ends of the three-way valve (10) through a liquid outlet pipe (11), and a one-way valve (5) is provided on each of the liquid outlet pipes (11), the vertical end of the three-way valve (10) is connected to an injection pipe (9), and a one-way valve (8) is provided on the injection pipe (9); The height adjustment mechanism includes a top frame (13) and a sliding lock box (18), the top frame (13) is fixedly connected to the top of the pumping box (1), the middle part of the inner side of the top frame (13) is fixedly connected to the rack rod (14), and a plurality of corresponding card slots (16) are equidistantly provided on both sides of the top frame (13) and the rack rod (14), the sliding lock box (18) is fixedly connected to the outer side of the vertical pipe (19) near the top, the left and right sides of the sliding lock box (18) are provided with inner slide grooves (30), the upper and lower sides of the inner slide groove (30) are provided with transverse slide grooves (36), and the transverse slide grooves (36) are provided. The grooves (36) all pass through the slide lock box (18), and the middle and rear sides of the slide lock box (18) are rotatably connected to the grip rod (33), and the rod wall of the grip rod (33) is provided with a vertical slide groove (34). The inner slide groove (30) is slidably connected to the plug block (32), and the adjacent side of the plug block (32) is provided with a spring (37). The plug block (32) is fixedly connected to the central axis rod (35), and the two ends of the central axis rod (35) respectively pass through the corresponding horizontal slide groove (36) and extend into the vertical slide groove (34), and the plug block (32) is engaged with the slot (16); A sealing ring (31) is provided at the sliding connection between the pumping box (1) and the vertical pipe (19), and a plug (29) is provided at the top end of each piston block (28), and the plug (29) corresponds to the bottom end of the vertical pipe (19) respectively.

2. The device for combined injection of nanofluid and active agent for coal seam permeability enhancement according to claim 1, characterized in that: Both sides of the chamber 1 (101) and the chamber 2 (102) are fixedly connected to a limiting plate (27) located above the liquid inlet pipe (4) and the liquid outlet pipe (11) near the bottom.

3. The device for combined injection of nanofluid and active agent for coal seam permeability enhancement according to claim 1, characterized in that: A scale (25) is provided on the front side of the rack (14), and two liquid level windows (12) are vertically provided on the front side of the pumping box (1), and the liquid level windows (12) correspond to chamber one (101) and chamber two (102) respectively.

4. The device for combined injection of nanofluid and active agent for coal seam permeability enhancement according to claim 1, characterized in that: A liquid infusion port (6) is provided on the top of one side of the first container (3) and the second container (22), and a sealing cover is threadedly connected to the liquid infusion port (6). A pressure relief valve (24) is provided on the top of the first container (3) and the second container (22).

5. The device for combined injection of nanofluid and active agent for coal seam permeability enhancement according to claim 1, characterized in that: A connecting frame (15) is fixedly connected to the middle of the rear side of the mounting frame (2), the front side of the connecting frame (15) is fixed to the top frame (13), and a hanger (21) is sleeved on the main air pipe (23), and the hanger (21) is fixedly connected to the inner top end of the connecting frame (15).

6. The device for combined injection of nanofluid and active agent for coal seam permeability enhancement according to claim 1, characterized in that: The nanofluid is one or more of nanoalumina fluid, nanosilver fluid and carbon nanotube fluid.

7. The device for combined injection of nanofluid and active agent for coal seam permeability enhancement according to claim 1, characterized in that: The active agent is one or more of sodium alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether and cocamidopropyl betaine.

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