Three-plugging one-injection low-temperature propylene oxide efficient gasification fracturing and permeability improvement device and method

Abstract

The application discloses a "three plugging and one injection" low-temperature epoxy propane efficient gasification fracturing permeability improvement device and method, which comprises five functions of efficient hole sealing, hole cleaning and dust blocking, efficient heating, automatic control and safety and reliability. The device adopts a "three plugging and one injection + slip" technology to block the new fractures around the drilling hole, so that the artificial induced coal seam gas directional flow is realized. The coal seam is fractured by the high-pressure and low-temperature gas generated by the epoxy propane. The coal seam is fractured by the way that the low-temperature epoxy propane is injected into the fractured hole to make the low-temperature epoxy propane gasify. After the high-pressure gas enters the coal body, the high-pressure gas is uniformly distributed in the coal seam, the internal fractures of the coal body are promoted to develop, expand and penetrate, and the permeability of the coal seam is uniformly increased, so that the purpose of efficient fracturing and permeability improvement is realized, and the problem of significant disasters caused by gas over-limit is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine underground gas control, in particular to a "three plugging and one injection" low-temperature propylene oxide efficient gasification fracturing permeability improvement device and its operation method. BACKGROUND

[0002] With the increase of mining depth, the amount of gas emission is getting larger and larger, and the threat of gas explosion and gas outburst is getting more and more serious. The main measure to solve the gas problem in the process of mining low-permeability coal seam is to implement coal seam gas extraction in advance, and more than 95% of the outburst mines in China are mining coal seams with low permeability, and the permeability coefficient of the coal seam is only 0.004-0.04 m 2 / (mpa 2 ·d), the gas extraction is very difficult, and the poor gas extraction effect is the main problem to be solved at present, so improving the permeability of the coal seam is the key to the effectiveness of the pre-extraction gas outburst prevention measures.

[0003] The main measures to improve the permeability of the coal seam at present are hydraulic punching, deep hole loosening blasting, water jet slotting technology and water pressure pre-cracking. The explosive used in deep hole pre-cracking blasting is difficult to obtain administrative approval, and the transportation and storage process is controlled. The patent CN106368730A discloses a coal seam hydraulic pressure punching permeability improvement system and its construction method, which takes water pressure punching measures on the coal seam after water pressure cracking, the purpose is to increase the permeability of the coal seam by water pressure cracking and water pressure punching; the patent CN111197497B discloses a high-pressure hydraulic punching comprehensive permeability improvement method for stone door coal uncovering, which adopts static pressure water punching and high-pressure water pressure punching combined hydraulic punching measures. However, the above two simple hydraulic measures are prone to induce outburst due to the uneven pressure in the coal body, and the water in the coal body is difficult to discharge, which causes serious water accumulation in the extraction system, and the permeability improvement effect is not ideal, and the coal quantity is not easy to control during hydraulic punching, and the operation is not safe. SUMMARY

[0004] In view of the above technical problems, the present application adopts the following technical scheme:

[0005] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0006] In the study of the physical properties of coal rock mass under ultra-low temperature conditions, it is found that the ultra-low temperature impact has a certain damage effect on the pore structure of coal rock mass, and the pore volume and quantity of coal rock mass increase. Propylene oxide is an organic compound with the chemical formula C3H6O, colorless ether liquid, melting point: -112 DEG C, boiling point: 34 DEG C, molar volume (cm 3 / mol): 64.2; should be stored in a cool, ventilated, dry place below 25 DEG C, not directly exposed to sunlight and isolated from fire. The present application utilizes propylene oxide to generate high-pressure low-temperature gas to fracture the coal seam, so as to realize the purpose of increasing the permeability of the coal seam, and has great significance for the treatment and efficient utilization of coal seam gas.

[0007] The first object of the present application is to provide a "three plugging and one injection" low-temperature propylene oxide efficient gasification fracturing permeability device, which comprises a gasification fracturing mechanism, a low-temperature propylene oxide pressurizing mechanism, a water pressurizing mechanism, a slurry pressurizing mechanism and a hydraulic mechanism, the gasification fracturing mechanism is installed in a pre-set hole, the gasification fracturing mechanism comprises a hydraulic pipe, a grouting pipe, a water injection pipe and a liquid injection pipeline;

[0008] One end of the hydraulic pipe is connected with a hydraulic push rod, the upper end of the hydraulic push rod is provided with a slip, the slip is arranged on both sides of the grouting area, the other end of the hydraulic pipe is connected with the hydraulic mechanism, and the hydraulic mechanism comprises a switch eight, a pressurizing device, a switch seven and a hydraulic device which are connected in sequence;

[0009] The liquid injection pipeline is located in the central part of the gasification fracturing mechanism, one end of the liquid injection pipeline is connected with a gas storage space and a gas pressure initial space, the gas storage space is located in the liquid injection pipeline, and a linkage card mechanism is arranged in the gas storage space; the linkage card mechanism comprises linkage card one and linkage card two which are arranged at two ends of the gas storage space respectively; the other end of the liquid injection pipeline is connected with the low-temperature propylene oxide pressurizing mechanism, the low-temperature propylene oxide pressurizing mechanism comprises a switch two, a liquid injection pump, a switch one and a low-temperature propylene oxide container which are connected in sequence, and the low-temperature propylene oxide container is wrapped with a heat preservation device;

[0010] One end of the water injection pipe is connected with a bag, a heat transfer guide pipe and a cleaning spray head in sequence, the heat transfer guide pipe is wound around the gas storage space, and the cleaning spray head is located at the top end of the gasification fracturing mechanism and arranged in the inside of a protective cover; the cleaning spray head converts the pressure water into atomized water, and humidifies the small coal dust so that the small coal dust is captured; the other end of the water injection pipe is provided with the water pressurizing mechanism, and the water pressurizing mechanism comprises a switch four, a water injection pump, a switch three and a water container which are connected in sequence;

[0011] One end of the grouting pipe is provided with a grouting port, the grouting port is located in the grouting area and ensures that the grouting area is located in the drilling broken circle, and the other end is connected with the slurry pressurizing mechanism; the slurry pressurizing mechanism comprises a switch five, a grouting pump, a switch six and a slurry container which are connected in sequence;

[0012] Preferably, the linkage card one and the linkage card two comprise a fixed card and a movable card connected by a cylinder, the fixed card and the movable card are provided with misaligned holes, a cap at the end of the cylinder is provided with a reset spring between the cap and the card, the compression force of the reset spring is set, when the movable card on the linkage card one is pushed away, the airflow can enter the gas storage space through the misaligned holes; the low-temperature propylene oxide pressurizing device can push away the linkage card one, the propylene oxide gasification volume expansion generates pressure to push the linkage card two to move and close the linkage card one.

[0013] Preferably, the heat transfer conduit and the gas storage space have good heat transfer performance, and the materials of the two belong to high-pressure-resistant materials.

[0014] Preferably, the position limiter is installed at a fixed position of the device according to the stress distribution of the use environment, and is located on both sides of the capsule bag, the slip and the grouting area.

[0015] Preferably, the heat preservation device should ensure that the temperature of the low-temperature propylene oxide is below 25 DEG C.

[0016] Preferably, the liquid non-solidified slurry is non-solidified in the whole construction cycle and is in a flowing state, and is green, environmentally friendly and non-polluting.

[0017] Preferably, the pressure-bearing water is added with a surfactant to ensure that the coal dust surface has good hydrophilicity.

[0018] The second object of the application is to provide a running method of the "three-sealing and one-grouting" low-temperature propylene oxide high-efficiency gasification fracturing permeability improvement device, comprising the following steps:

[0019] S1: after the preset hole construction is completed, the device is placed in the preset hole; after the water injection pump is operated for 5±0.5 min at a constant water injection pressure, 35 DEG C-100 DEG C warm water flows from the water container through the water injection pipe into the capsule bag, the heat transfer conduit and the cleaning nozzle in turn, the capsule bag expands, the slip is clamped on the coal rock of the preset hole, and the initial sealing of the preset hole is performed, and the cleaning nozzle starts to wash the protective cover;

[0020] S2: the hydraulic device and the pressurizing device are opened, the hydraulic push rod pushes the slip to move upward and tightly clamp on the coal rock wall of the preset hole;

[0021] S3: after the water injection is performed for 15 min±0.5 min, the water injection pump continues to operate at a constant water injection pressure; after the grouting pump is operated for 5±0.5 min at a constant grouting pressure, the liquid non-solidified slurry enters the grouting pipe from the slurry container through the grouting pump, and enters the grouting area and the drilling broken ring from the grouting port in turn, and the second sealing of the to-be-sealed hole area is performed; after the grouting pump is operated for 15±0.5 min at a constant grouting pressure, the preset hole position is sealed for the third time by using polyurethane;

[0022] S4: After the polyurethane hole sealing for 10±0.5 min, the liquid injection pump is operated at a constant liquid injection pressure for 2 min±0.5 min, then the liquid propylene oxide is flowed into the gas storage space from the liquid injection pipeline, linkage card one, and the heat transfer conduit is used to transfer heat to the gas storage space to heat the liquid propylene oxide to 35℃ for gasification, the liquid injection pump stops working for 5 min±0.5 min, and when the gasification pressure in the gas storage space is greater than the spring compression force of linkage card two, linkage card two is pushed, and the gaseous propylene oxide enters the gas pressure initial space through the linkage card two hole to fracture the coal body;

[0023] S5: After the expected effect of fracturing is achieved, all switches and pumps are turned off, the polyurethane is taken out, the water in the bag is discharged through the water injection pipe, the slips and the hydraulic push rod are decompressed to return to the original position, and the gasification and fracturing mechanism is taken out, which can be repeatedly used for multiple times.

[0024] Preferably, the constant water injection pressure, the constant grouting pressure and the constant liquid injection pressure are 4-6 MPa, the spring force of the linkage card one is controlled below the constant liquid injection pressure, the spring compression force of the linkage card two is greater than the constant liquid injection pressure, and the gasification volume expansion of the propylene oxide generates pressure to push the card to move.

[0025] Preferably, the pre-set borehole outside includes a low-temperature propylene oxide pressurizing mechanism, a water pressurizing mechanism and a slurry pressurizing mechanism, which are connected with a terminal device through wires, and a dynamic pressure compensation effect is achieved through a pre-set pressure value, and when the parameter is lower than the pre-set value, the three pressurizing mechanisms are automatically started, and when the designed pressure value is reached, the pressurizing work is stopped, and automatic control pressurizing is realized.

[0026] Preferably, the device includes a plurality of gasification and fracturing mechanisms, the gasification and fracturing mechanisms are installed in the pre-set holes, and each gasification and fracturing mechanism is connected with the low-temperature propylene oxide pressurizing mechanism, the water pressurizing mechanism, the slurry pressurizing mechanism and the hydraulic mechanism through an integrated switch, and multi-hole linkage is realized.

[0027] The present application has the following advantages:

[0028] (1) Efficient hole sealing: the "three plugging and one injection + slip" technology is used to realize efficient plugging of the new fissures around the borehole, so as to induce the directional flow of coal seam gas; three plugging is to use two bags + borehole polyurethane, and the two bags are inflated to tightly adhere to the coal wall through a water injection pump, so as to achieve the effect of one-time hole sealing of the pre-set hole; non-solidified slurry is injected into the injection area to penetrate into the fissure channel around the pre-set hole, and dynamic grouting achieves the effect of twice hole sealing of the pre-set hole; after the grouting pressure reaches the pre-set pressure, the borehole is sealed by polyurethane material for three times, so that the pre-set hole reaches the best sealing state; the slip mechanism is located on both sides of the grouting area and can be controlled to move up and down by a hydraulic push rod, which can be firmly clamped into the coal wall and has good gripping force, so that it can withstand greater grouting pressure and avoid excessive pressure from pressing out the permeability equipment;

[0029] (2) Hole cleaning and dust prevention: The gas fracturing process breaks the original shape of the coal, generating fine coal dust, and the blocking shield reduces the desired effect of the permeability increasing device; the top end of the device is provided with a cleaning nozzle and a protective cover, and a water injection pump delivers pressurized water to the hole cleaning nozzle through a pipeline, and the cleaning nozzle converts the pressurized water into atomized water to capture the fine coal dust;

[0030] (3) Efficient heating: The construction site uses low-temperature propylene oxide to heat the volume expansion to fracture the coal seam, and the device is provided with a gas storage space and a heat transfer pipe, the heat transfer pipe is spirally wound around the gas storage space, and the water injection pump delivers 35°C pressurized water through the heat transfer pipe to transfer heat to the low-temperature propylene oxide inside the gas storage space. Preferably, the heat transfer pipe and the gas storage space have good heat transfer performance, and the materials of the two are high-pressure-resistant materials;

[0031] (4) Automatic control: The pre-set drilling outside includes three automatic control pressurizing devices of low-temperature propylene oxide pressurizing device, water pressurizing device and slurry pressurizing device, and the dynamic pressure compensation effect can be achieved by pre-setting the pressure value, if it is lower than the pre-set value, the three pressurizing devices can be automatically started, and the pressurizing work is stopped after the designed pressure value is reached, realizing automatic control of fracturing and permeability increasing;

[0032] (5) Safety and reliability: The low-temperature propylene oxide is transported to the construction site by low-pressure bottle, and the pressurizing device is used to deliver the low-temperature propylene oxide to the gas storage space every 2 minutes, and then stop working for 5 minutes. The intermittent pressurization form and the linkage card mechanism designed by the card + spring at both ends of the gas storage space are used, this process cycle is normally operated, avoiding the leakage of high-pressure gas during the process of going down the well, causing significant loss, and the fracturing and permeability increasing is safe and reliable;

[0033] (6) High-efficiency fracturing and permeability increasing: The coal seam is fractured by injecting low-temperature propylene oxide to make it heat up and gasify, and when the temperature of the gas storage space rises, it can fully heat up and gasify to generate a huge pressure to push away the linkage card, and the high-pressure propylene oxide is pressed out to the gas pressure initial space to complete the work of crushing the coal body, and the high-pressure gas enters the coal body and is evenly distributed in the coal seam, promoting the development, expansion and penetration of the internal cracks of the coal body, thereby uniformly increasing the permeability of the coal seam; The average extraction flow of a single hole increases by more than 80%, the effective extraction time increases by about 50%, the gas content in the coal seam in the fracturing area is reduced by 20% or less, effectively controlling the high-gas outburst disaster and ensuring the safety of underground workers; It is expected to shorten the gas extraction time by 40%, which is conducive to accelerating the progress of coal mining for coal mining enterprises, and has good economic value. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0035] Figure 1 The three-dimensional structure schematic diagram of the "three plugging and one injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device provided for the embodiment 1 is shown in the figure.

[0036] Figure 2 The overall structure schematic diagram of the "three plugging and one injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device provided for the embodiment 1 is shown in the figure.

[0037] Figure 3 The installation structure schematic diagram of the "three plugging and one injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device provided for the embodiment 1 is shown in the figure.

[0038] Figure 4 The overall structure of the linkage card mechanism provided for the embodiment 1 is shown in the figure.

[0039] Figure 5 The working principle schematic diagram of the linkage card provided for the embodiment 1 is shown in the figure, wherein (A) is the closed state diagram, and (B) is the state diagram when the linkage card is pushed away and the air is ventilated.

[0040] Figure 6 The installation process schematic diagram of the "three plugging and one injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device provided for the embodiment 1 is shown in the figure, wherein (a) is that the device is loaded into the preset hole, (b) is that the device is placed in the preset hole, (c) is that the bag is inflated and the slip is clamped on the coal rock in the preset hole.

[0041] Figure 7 The installation process schematic diagram of the "three plugging and one injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device provided for the embodiment 1 is shown in the figure, wherein (d) is that the liquid non-condensed slurry is injected at a constant pressure to block the surrounding fissures, (e) is that the polyurethane blocks the hole, (f) is that after the work is completed, the polyurethane material in the hole is removed, the bag is decompressed and restored, the slip is restored to the original position, and the equipment is taken out.

[0042] Figure 8 The connection diagram of the gasification fracturing mechanism and the low-temperature epoxy propane pressurizing mechanism, the water pressurizing mechanism, the slurry pressurizing mechanism and the hydraulic mechanism provided for the embodiment 2 is shown in the figure.

[0043] Figure 9 The automatic control connection diagram of the gasification fracturing mechanism and the low-temperature epoxy propane pressurizing mechanism, the water pressurizing mechanism, the slurry pressurizing mechanism and the hydraulic mechanism provided for the embodiment 2 is shown in the figure.

[0044] Explanation of the reference signs:

[0045] 1. Hydraulic pipe; 2. Grouting pipe; 3. Water injection pipe; 4. Bag; 5. Slip; 6. Hydraulic push rod; 7. Grouting port; 8. Gas storage space; 9. Heat transfer conduit; 10. Linkage card mechanism; 11. Cleaning nozzle; 12. Protective cover; 13. Polyurethane; 14. Grouting area; 15. Drilling break ring; 16. Initial gas pressure space; 17. Linkage card one; 18. Linkage card two; 19. Low-temperature propylene oxide volumetric diaphragm; 20. Insulation device; 21. Injection pump; 22. Switch two; 3. Switch 1; 24. Water capacity device; 25. Water injection pump; 26. Switch 4; 27. Switch 3; 28. Slurry capacity device; 29. ​​Grouting pump; 30. Switch 5; 31. Switch 6; 32. Integrated switch 1; 33. Integrated switch 2; 34. Integrated switch 3; 35. Integrated switch 4; 36. Integrated switch 5; 37. Limit switch; 38. Pressurization device; 39. Switch 8; 40. Switch 7; 41. Hydraulic device; 42. Injection pipeline; 43. Wire; 44. Terminal control system. Detailed Implementation

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] Example 1

[0048] like Figures 1 to 4 As shown, the "three-blocking and one-injection" low-temperature propylene oxide high-efficiency gasification fracturing and permeability enhancement device includes a gasification fracturing mechanism, a low-temperature propylene oxide pressurization mechanism, a water pressurization mechanism, a slurry pressurization mechanism, and a hydraulic mechanism. The gasification fracturing mechanism is installed in a preset hole and includes a hydraulic pipe 1, a grouting pipe 2, a water injection pipe 3, and a liquid injection pipe 42.

[0049] One end of the hydraulic pipe 1 is connected to the hydraulic push rod 6. The upper end of the hydraulic push rod 6 is equipped with a slip 5. The slip 5 is set on both sides of the grouting area 14 and is controlled to move up and down by the hydraulic push rod, so that it can be firmly inserted into the coal wall. The other end of the hydraulic pipe 1 is connected to the hydraulic mechanism, which includes a switch 39, a pressurizing device 38, a switch 40 and a hydraulic device 41 connected in sequence.

[0050] The injection pipe 42 is located in the central part of the gasification fracturing mechanism. One end of the injection pipe 42 is connected to the gas storage space 8 and the initial gas pressure space 16. The gas storage space 8 is located in the injection pipe 42 and is equipped with a linkage card mechanism 10, as shown in the figure. Figure 4As shown, the linkage card mechanism 10 includes two parts, linkage card one 17 and linkage card two 18, which are installed at both ends of the gas storage space 8; the other end of the liquid injection pipeline 42 is connected with a low-temperature propylene oxide pressurizing mechanism, which includes switch two 22, liquid injection pump 21, switch one 23, and low-temperature propylene oxide container 19 connected in sequence, and the low-temperature propylene oxide container 19 is wrapped with a heat preservation device 20, which should ensure that the temperature of the low-temperature propylene oxide is below 25℃, and can be a condenser through which condensed water passes.

[0051] One end of the water injection pipe 3 is connected with the bag 4, heat transfer conduit 9, and cleaning spray head 11 in sequence, the heat transfer conduit 9 is spirally wound around the gas storage space 8, and the cleaning spray head 11 is located at the top end of the device and is installed inside the protective cover 12. The cleaning spray head 11 converts the pressurized water into atomized water to humidify the small coal dust and make it be captured. The other end of the water injection pipe 3 is installed with a water pressurizing mechanism, which includes switch four 26, water injection pump 25, switch three 27, and water container 24 connected in sequence. Preferably, the pressurized water is added with a surfactant to ensure that the coal dust surface has good hydrophilicity.

[0052] One end of the grouting pipe 2 is provided with a grouting port 7 located in the grouting area 14, and the other end is connected with a slurry pressurizing mechanism, which includes switch five 30, grouting pump 29, switch six 31, and slurry container 28 connected in sequence;

[0053] The position limiter 37 is installed at a fixed position of the device according to the stress distribution of the use environment, which is located on both sides of the bag 4, slip 5, and grouting area 14, to ensure that the grouting area 14 is located in the broken circle 15 of the drill hole.

[0054] The linkage card one 17 and the linkage card two 18 are the same in structure, as shown in Figure 4 Both include fixed cards and movable cards, the fixed cards in the linkage cards are all arranged on the left side, and the movable cards are all arranged on the right side, the fixed cards are fixed on the inner wall of the gas storage space 8, and the movable cards can move linearly along the direction of the device. The fixed cards and the movable cards are provided with offset holes, when the movable card is pushed away, the airflow can enter the gas storage space through the offset holes; the center of the linkage card is provided with a steel cylinder with a diameter of 3mm, and the center of the fixed card or the movable card is correspondingly provided with a 3mm small hole for the cylinder to pass through, the end of the cylinder is provided with a cap, and a return spring is installed between the cap and the card.

[0055] The spring elastic force of the linkage card 17 is controlled below 5Mpa, which meets the low-temperature propylene oxide pressurizing device to push away the linkage card 17, and when the temperature of the gas storage space is increased, the propylene oxide gasification volume expansion generates a huge pressure (greater than 5Mpa) to push away the linkage card 18, and the spring compression force of the linkage card 18 is greater than 5Mpa, which meets the propylene oxide gasification volume expansion to generate a pressure to push the card to move. The pressure generated by the propylene oxide gasification volume expansion can close the linkage card 17. Preferably, after the linkage card 17 and the linkage card 18 of the gas storage space and the storage space wall are moved, a channel is left to realize that the propylene oxide gas enters the initial gas pressure space 16. Preferably, the linkage card 17 and the linkage card 18 are subjected to a minimum elastic force, do not deform, and can be restored to the initial state. Preferably, the pressurizing device works for 2min, and the low-temperature liquid propylene oxide can fill the storage space to work; the pressurizing device stops working for 5min, and the low-temperature liquid propylene oxide in the gas storage space 8 can be fully heated and gasified and pressurized to the initial gas pressure space 16 to complete the crushing coal body work. The process cycle is normally operated.

[0056] The device electronics should be intrinsically safe, in line with the general technical conditions for electrical equipment used in coal mines. Preferably, to achieve automatic control effect, as shown in Figure 9 The preset borehole outside includes a low-temperature propylene oxide pressurizing mechanism, a water pressurizing mechanism, and a slurry pressurizing mechanism, three automatic control pressurizing devices. Each pressurizing mechanism is connected with the terminal control system 44 through a wire 43, and a dynamic pressure compensation effect can be realized through a preset pressurizing value. If the value is lower than the preset value, the three pressurizing devices can be automatically started, and the pressurizing work is stopped after the designed pressure value is reached. Preferably, the three pressurizing devices are provided with flow meters and pressure sensors to realize the functions of dynamic flow measurement and pressure measurement, and the pressurizing work can be dynamically adjusted according to the preset value.

[0057] The above-mentioned "three plugging and one injection" low-temperature propylene oxide efficient gasification fracturing and permeability improvement device, as shown in Figures 5-6 The single-hole fracturing function includes the following use steps:

[0058] S1: After the preset hole construction is completed, the device is placed in the preset borehole. Turn on the switch four 26 and the switch three 27, and the water injection pump 25 is operated at a constant pressure of 5Mpa for 5min. Then, the 35℃ warm water flows from the water container 24 through the water injection pipe 3 into the bag 4, the heat transfer conduit 9 and the cleaning nozzle 11 in sequence, the bag 4 expands, the slip is clamped on the preset hole coal rock, and the initial sealing effect of the preset hole is realized, and the cleaning nozzle 11 starts to wash the protective cover 12;

[0059] S2: Turn on the hydraulic device 41 and the pressurizing device 38, and the hydraulic push rod 6 pushes the slip 5 to move upward and tightly clamps into the preset hole coal rock wall;

[0060] S3: After 15 minutes of water injection, the water injection pump 25 continues to operate at a constant pressure of 5Mpa. Turn on switch five 30 and switch six 31, and the grouting pump 29 operates at a constant pressure of 5Mpa for 5 minutes. The liquid non-solidified slurry in the slurry container 28 enters the grouting pipe 2 through the grouting pump 29, enters the grouting area 14 and the drilling broken ring 15 through the grouting port 7, and performs secondary sealing on the sealing area. After the grouting pump 29 operates at a constant pressure of 5Mpa for 15 minutes, the pre-set hole hole position will be sealed by polyurethane 13 for three times;

[0061] S4: After 10 minutes of polyurethane 13 sealing, turn on switch one 23 and liquid injection pump 21. After the liquid injection pump 21 operates at a constant pressure of 5Mpa for 2 minutes, turn on switch two 22. The liquid propylene oxide flows into the gas storage space 8 through the liquid injection pump 21, the linkage card one 17, and the heat transfer conduit 9. The heat transfer conduit 9 heats the gas storage space 8 to make the liquid propylene oxide heated to 35℃ and gasified. The liquid injection pump 21 stops working for 5 minutes. After gasification, the pressure in the gas storage space 8 is greater than 5Mpa, which pushes the linkage card two 18. The gaseous propylene oxide enters the gas pressure initial space 16 through the hole of the linkage card two 18 to fracture the coal body;

[0062] S5: After the expected effect of fracturing is achieved, all switches and pumps are turned off. First, remove the polyurethane 13, then remove the water in the bladder 4 through the water injection pipe 3, and then remove the "three sealing and one injection" low-temperature propylene oxide efficient gasification and fracturing permeability improvement device. It can be used repeatedly.

[0063] Example 2

[0064] As shown in Figure 7 , the "three sealing and one injection" low-temperature propylene oxide efficient gasification and fracturing permeability improvement device is the same as example 1, except that the device is provided with a plurality of gasification and fracturing mechanisms, and the gasification and fracturing mechanisms are installed in the pre-set hole. Each gasification and fracturing mechanism is connected with the low-temperature propylene oxide pressurizing mechanism, the water pressurizing mechanism, the slurry pressurizing mechanism and the hydraulic mechanism through the integrated switch respectively.

[0065] As shown in Figures 8-9 , this example is provided with five gasification and fracturing mechanisms, and each gasification and fracturing mechanism is provided with an integrated switch. The integrated switch includes integrated switch one 32, integrated switch two 33, integrated switch three 34, integrated switch four 35 and integrated switch five 36.

[0066] The above-mentioned "three sealing and one injection" low-temperature propylene oxide efficient gasification and fracturing permeability improvement device, as shown in Figure 7 , the multi-hole linkage function includes the following steps:

[0067] S1: after the completion of the pre-set hole construction, the device is placed in the pre-set hole. Turn on integrated switch one 32, integrated switch two 33, integrated switch three 34, integrated switch four 35, integrated switch five 36 and switch three 27, after the water injection pump 25 runs at a constant pressure of 5Mpa for 5 minutes, turn on switch four 26, and 35℃ warm water flows from the water injection pump 25 through the water injection pipe 3 into the bladder bag 4, the heat transfer conduit 9 and the cleaning spray head 11 in turn from the water container 24, the bladder bag 4 expands, and the initial sealing effect is achieved on the pre-set hole; the cleaning spray head 11 starts to wash the protective cover 12;

[0068] S2: turn on the hydraulic device 41 and the pressurizing device 38, the hydraulic push rod 6 pushes the slip 5 to move upwards and tightly clamps into the pre-set hole coal rock wall;

[0069] S3: after water injection for 15 minutes, the water injection pump 25 continues to run at a constant pressure of 5Mpa. Turn on switch five 30 and the grouting pump 29 runs at a constant pressure of 5Mpa for 5 minutes, then turn on switch six 31, and the liquid non-solidified slurry enters the grouting pipe 2 from the slurry container 28 through the grouting pump 29, enters the grouting area 14 and the hole broken circle 15 in turn from the grouting port 7, and performs secondary sealing on the area to be sealed. After the grouting pump 29 runs at a constant pressure of 5Mpa for 15 minutes, the pre-set hole opening position is sealed by polyurethane 13 for three times;

[0070] S4: after the polyurethane 13 seals the hole for 10 minutes, turn on switch one 23 and the liquid injection pump 21, and after the liquid injection pump 21 runs at a constant pressure of 5Mpa for 2 minutes, turn on switch two 22, and the liquid propylene oxide gasifies by the heat transfer conduit 9 to make the liquid propylene oxide heated to 35℃, and the liquid injection pump 21 stops working for 5 minutes. After gasification, the pressure in the gas storage space 8 is greater than 5Mpa, which pushes the linkage card two 18, and the gaseous propylene oxide enters the gas pressure initial space 16 to fracture the coal body through the hole of the linkage card two 18;

[0071] S5: after the expected effect of pressure cracking is achieved, turn off switch six 31, switch five 30, switch four 26, switch three 27, switch two 22 and switch one 23, and turn off integrated switch one 32, integrated switch two 33, integrated switch three 34, integrated switch four 35 and integrated switch five 36. First, take out the polyurethane 13, then discharge the water in the bladder bag 4 through the water injection pipe 3, and the slip 5 and the hydraulic push rod 6 are decompressed and restored to the original position. Take out the "three sealing and one injection" low-temperature propylene oxide efficient gasification and fracturing permeability improvement device, which can be repeatedly used for many times.

[0072] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A "three plugging and one injection" low-temperature propylene oxide efficient gasification fracturing and permeability improvement device, characterized in that, The gasification fracturing mechanism, low-temperature epoxy propane pressurizing mechanism, water pressurizing mechanism, slurry pressurizing mechanism and hydraulic mechanism are installed in the preset hole. One end of the hydraulic pipe (1) is connected with the hydraulic push rod (6), the upper end of the hydraulic push rod (6) is installed with the slip (5), the slip (5) is arranged on both sides of the grouting area (14), the other end of the hydraulic pipe (1) is connected with the hydraulic mechanism, the hydraulic mechanism comprises the switch eight (39), the pressurizing device (38), the switch seven (40) and the hydraulic device (41) which are connected in sequence. The injection pipeline (42) is located in the central part of the gasification fracturing mechanism, one end of the injection pipeline (42) is connected with the gas storage space (8) and the gas pressure initial space (16), the gas storage space (8) is located in the injection pipeline (42) and is provided with the linkage card mechanism (10), the linkage card mechanism (10) comprises the linkage card one (17) and the linkage card two (18) which are respectively installed at both ends of the gas storage space (8); the other end of the injection pipeline (42) is connected with the low-temperature epoxy propane pressurizing mechanism, the low-temperature epoxy propane pressurizing mechanism comprises the switch two (22), the injection pump (21), the switch one (23) and the low-temperature epoxy propane container (19) which are connected in sequence, and the low-temperature epoxy propane container (19) is wrapped with the heat preservation device (20). The linkage card one (17) and the linkage card two (18) comprise the fixed card and the movable card which are connected through the cylinder, the fixed card and the movable card are provided with the staggered holes, the cap at the end of the cylinder is provided between the card, and the reset spring is arranged between the cap and the card, the compression force of the reset spring is set, when the movable card on the linkage card one (17) is pushed away, the airflow can enter the gas storage space through the staggered holes; the low-temperature epoxy propane pressurizing device can push away the linkage card one (17), the epoxy propane gasification volume expansion generates the pressure to push the linkage card two (18) to move and close the linkage card one (17); One end of the injection pipeline (42) is connected with the gas storage space (8) and the gas pressure initial space (16), the gas storage space (8) is located in the injection pipeline (42) and is provided with the linkage card mechanism (10), the linkage card mechanism (10) comprises the linkage card one (17) and the linkage card two (18) which are respectively installed at both ends of the gas storage space (8); the other end of the injection pipeline (42) is connected with the low-temperature epoxy propane pressurizing mechanism, the low-temperature epoxy propane pressurizing mechanism comprises the switch two (22), the injection pump (21), the switch one (23) and the low-temperature epoxy propane container (19) which are connected in sequence, and the low-temperature epoxy propane container (19) is wrapped with the heat preservation device (20). One end of the injection pipeline (42) is connected with the gas storage space (8) and the gas pressure initial space (16), the gas storage space (8) is located in the injection pipeline (42) and is provided with the linkage card mechanism (10), the linkage card mechanism (10) comprises the linkage card one (17) and the linkage card two (18) which are respectively installed at both ends of the gas storage space (8); the other end of the injection pipeline (42) is connected with the low-temperature epoxy propane pressurizing mechanism, the low-temperature epoxy propane pressurizing mechanism comprises the switch two (22), the injection pump (21), the switch one (23) and the low-temperature epoxy propane container (19) which are connected in sequence, and the low-temperature epoxy propane container (19) is wrapped with the heat preservation device (20). One end of the injection pipeline (42) is connected with the gas storage space (8) and the gas pressure initial space (16), the gas storage space (8) is located in the injection pipeline (42) and is provided with the linkage card mechanism (10), the linkage card mechanism (10) comprises the linkage card one (17) and the linkage card two (18) which are respectively installed at both ends of the gas storage space (8); the other end of the injection pipeline (42) is connected with the low-temperature epoxy propane pressurizing mechanism, the low-temperature epoxy propane pressurizing mechanism comprises the switch two (22), the injection pump (21), the switch one (23) and the low-temperature epoxy propane container (19) which are connected in sequence, and the low-temperature epoxy propane container (19) is wrapped with the heat preservation device (20).

2. The "three-walls-one- injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device according to claim 1, characterized in that, The heat transfer conduit (9) and the gas storage space (8) have good heat transfer performance, and the materials of the two belong to high pressure-resistant materials.

3. The "three-walls-one- injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device according to claim 1, characterized in that, The position limiter (37) is installed at a fixed position of the device according to stress distribution of a use environment, and is located at both sides of the capsule bag (4), the slip bowl (5) and the grouting area (14).

4. The "three-walls-one- injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device according to claim 1, characterized in that, The heat preservation device (20) should ensure that the temperature of the low-temperature propylene oxide is below 25 DEG C.

5. The "three-walls-one- injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device according to claim 1, characterized in that, The pressure-bearing water is added with a surfactant, so that the coal dust surface has good hydrophilicity.

6. The method for operating the "three-walls-one-injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device of claim 1, characterized in that, The method comprises the following steps: S1: after the preset hole is constructed, the device is placed in the preset hole; After the water injection pump (25) is opened to operate at a constant water injection pressure for 5±0.5 min, the warm water at 35 DEG C-100 DEG C is sequentially flowed into the capsule bag (4), the heat transfer conduit (9) and the cleaning nozzle (11) from the water container (24) through the water injection pipe (3) by the water injection pump (25), the capsule bag (4) is inflated, the slip bowl (5) is clamped on the coal rock of the preset hole, the initial sealing of the preset hole is performed, and the cleaning nozzle (11) starts to wash the protective cover (12); S2: the hydraulic device (41) and the pressurizing device (38) are opened, the hydraulic push rod (6) pushes the slip bowl (5) to move upward and tightly clamp on the coal rock wall of the preset hole; S3: after the water injection is performed for 15 min±0.5 min, the water injection pump (25) continues to operate at a constant water injection pressure; after the grouting pump (29) is opened to operate at a constant grouting pressure for 5±0.5 min, the liquid non-coagulation slurry is sequentially flowed into the grouting area (14) and the drilling broken ring (15) from the grouting pipe (2) through the grouting pump (29) from the grouting port (7), the secondary sealing of the area to be sealed is performed; after the grouting pump (29) operates at a constant grouting pressure for 15±0.5 min, the preset hole is sealed by the polyurethane (13) for the third time; S4: after the polyurethane (13) is used to seal the hole for 10±0.5 min, the liquid injection pump (21) operates at a constant liquid injection pressure for 2 min±0.5 min, then the liquid propylene oxide is flowed into the gas storage space (8) through the liquid injection pipeline (42) and the linkage card I (17), the heat transfer conduit (9) is used for heat transfer to the gas storage space (8) so that the liquid propylene oxide is heated to 35 DEG C and gasified, the liquid injection pump (21) stops working for 5 min±0.5 min, when the pressure of the gasified gas storage space (8) is greater than the spring setting compression force of the linkage card II (18), the linkage card II (18) is pushed, the gaseous propylene oxide enters the gas pressure initial space (16) through the hole of the linkage card II (18) to crack the coal body; S5: after the expected cracking effect is achieved, all switches and pump bodies are closed, the polyurethane (13) is taken out, then the water in the capsule bag (4) is discharged through the water injection pipe (3), the slip bowl (5) and the hydraulic push rod (6) are decompressed and restored to the original position, the gasification and cracking mechanism is taken out, and the gasification and cracking mechanism can be repeatedly used.

7. The operation method of the "three-walls-one-injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device according to claim 6, characterized in that, The constant water injection pressure, constant grouting pressure and constant liquid injection pressure are 4-6 MPa, the spring elastic force of the linkage card one (17) is controlled below the constant liquid injection pressure, and the spring compression force of the linkage card two (18) is greater than the constant liquid injection pressure, so as to meet the pressure generated by the volume expansion of the propylene oxide gasification to push the linkage card two (18) to move.

8. The operation method of the "three-walls-one-injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device according to claim 6, characterized in that, The preset drilling outside includes a low-temperature propylene oxide pressurizing mechanism, a water pressurizing mechanism and a slurry pressurizing mechanism, which are connected with a terminal device (43) through wires (44), and a dynamic pressure compensation effect is realized through a preset pressure value; when the parameters are lower than the preset value, the three pressurizing mechanisms are automatically started, and when the designed pressure value is reached, the pressurizing work is stopped, so that automatic control pressurizing is realized.

9. The operation method of the "three-walls-one-injection" low-temperature epoxy propane high-efficiency gasification fracturing and permeability improvement device according to claim 6, characterized in that, The device includes a plurality of gasification fracturing mechanisms, which are installed in preset holes, and each gasification fracturing mechanism is connected with a low-temperature propylene oxide pressurizing mechanism, a water pressurizing mechanism, a slurry pressurizing mechanism and a hydraulic mechanism through an integrated switch, so that multi-hole linkage is realized.

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