Underground self-power-generation sliding type impact permeation increasing device and energy resource underground gasification yield increasing method

Abstract

The invention relates to an underground self-power-generation sliding type impact permeation increasing device and an energy resource underground gasification yield increasing method. The underground self-power-generation sliding type impact permeation increasing device comprises an underground gasification pipe string, a sliding sleeve, a sliding driving mechanism, an impact hammer, a hydraulic driving mechanism and a self-power-generation mechanism. Self-power-generation, sliding displacement and mechanical impact permeation enhancing functions are integrated in a sleeve-shaped structure capable of moving along a tubular column, so that fixed-point and segmented impact fracture forming of the well wall of an energy resource layer is realized on the premise of not depending on external cable power supply and not influencing the existing gasification process. Mechanical permeation increasing is carried out on the rock well wall through the impact hammer, the gasification reaction area can be expanded on the premise that the number and diameter of drilled wells are not increased, and the gas output efficiency is improved; the whole moving and impacting structure is integrated in the sliding sleeve, the structure is compact, segmented impacting can be achieved, long-distance and multi-position continuous permeation increasing pretreatment on an energy resource layer is achieved under the condition that the existing gasification process is not affected, and operation continuity and economical efficiency are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to an underground self-generating sliding impact permeation enhancement device and a method for increasing energy production through underground gasification. Background Technology

[0002] Coal is an important energy resource, but traditional coal mining and utilization methods suffer from low efficiency and serious environmental pollution. Underground coal gasification technology is a clean energy technology that converts underground coal seams into combustible gas (crude coal gas) in situ. It has advantages such as high resource utilization and low environmental impact, and is considered one of the important ways to solve the energy crisis and achieve clean and efficient utilization of coal.

[0003] However, underground coal gasification technology still faces many technical bottlenecks in practical applications, the most prominent of which are small gasification area and low yield. Compared with surface coal gasification, underground coal gasification makes it difficult to effectively physically process the coal seam, resulting in the gasification reaction being limited to a limited area around the borehole. This makes it difficult to expand the gasification surface and leads to low overall gas production efficiency. Traditional methods to increase the gasification area usually rely on increasing the borehole length or diameter, but this significantly increases drilling costs and makes large-scale commercial application difficult.

[0004] Therefore, there is an urgent need for a low-cost device and method to increase the gasification area in underground coal gasification reactors in order to promote the large-scale application of underground coal gasification technology. Summary of the Invention

[0005] This invention provides a downhole self-generating sliding impact permeation enhancement device and a method for increasing the production of underground gasification of energy resources, in order to solve the defects of small gasification area and low yield in the existing technology of underground gasification of energy resources, and to maximize the gasification surface area without significantly increasing drilling costs.

[0006] This invention provides a downhole self-generating sliding impact permeation enhancement device, comprising an underground gasification tube string, a sliding sleeve, a sliding drive mechanism, an impact hammer, a hydraulic drive mechanism, and a self-generating mechanism. The underground gasification tube string includes a continuous tubing, a base tubing string, and an ignition device connected in sequence. The sliding sleeve is slidably fitted onto the outer circumferential surface of the base tubing string. The sliding drive mechanism is disposed on the sliding sleeve and is used to drive the sliding sleeve to move on the outer circumferential surface of the base tubing string. The impact hammer is retractably disposed on the outer circumferential surface of the sliding sleeve and is used to impact the wellbore wall to form fractures. The hydraulic drive mechanism is connected to the impact hammer. The self-generating mechanism is disposed within the sleeve wall of the sliding sleeve and is connected to the sliding drive mechanism and the hydraulic drive mechanism to provide working power.

[0007] According to the present invention, a downhole self-generating sliding impact permeation enhancement device is provided, wherein a plurality of telescopic support columns are respectively provided on the outer peripheral surface of the sliding sleeve near both ends, the plurality of telescopic support columns are evenly arranged along the circumference of the sliding sleeve, the telescopic support columns are rotatably disposed on the outer peripheral surface of the sliding sleeve via a first electric hinge shaft, the first electric hinge shaft is connected to the self-generating mechanism, and the telescopic support columns are connected to the hydraulic drive mechanism.

[0008] There are multiple impact hammers, which are evenly arranged along the circumference of the sliding sleeve. The impact hammers are rotatably mounted on the outer circumferential surface of the sliding sleeve via a second electric hinge shaft, which is connected to the self-generating mechanism.

[0009] According to the present invention, a downhole self-generating sliding impact permeation enhancement device is provided, wherein the sliding drive mechanism includes an inner sliding wheel and an outer sliding wheel. The inner sliding wheel is mounted on the inner circumferential surface of the sliding sleeve by a hydraulic spring, and the outer sliding wheel is mounted on the outer circumferential surface of the sliding sleeve by a hydraulic spring. The hydraulic spring is connected to the hydraulic drive mechanism. The inner sliding wheel and the outer sliding wheel are also respectively connected to a drive motor, and the drive motor is connected to the self-generating mechanism.

[0010] According to the present invention, a downhole self-generating sliding impact permeation enhancement device is provided, wherein the self-generating mechanism is a fuel cell, and the fuel cell is one of a proton exchange membrane fuel cell, an alkaline fuel cell, a phosphoric acid fuel cell, a molten carbonate fuel cell, and a solid oxide fuel cell. The fuel cell includes a battery reaction cell and a battery anode and a battery cathode located at both ends of the battery reaction cell.

[0011] According to the present invention, a downhole self-generating sliding impact permeation enhancement device is provided, wherein an energy storage device is further provided inside the sliding sleeve, the energy storage device is electrically connected to the self-generating mechanism, and is used to store the electrical energy released by the self-generating mechanism. The energy storage device is also connected to the sliding drive mechanism and the hydraulic drive mechanism respectively.

[0012] According to the present invention, a downhole self-generating sliding impact permeation enhancement device is provided, wherein the base tubing includes a hollow tube body, and an ignition cable channel for connecting the ignition device is arranged axially inside the hollow tube body. An oxidant channel is formed between the ignition cable channel and the inner wall of the hollow tube body, and a plurality of one-way valves communicating with the oxidant channel are provided on the hollow tube body.

[0013] The outer circumferential surface of the sliding sleeve is provided with a rough gas inlet, which is connected to the anode of the battery. The inner circumferential surface of the sliding sleeve is provided with an oxidant inlet connected to the cathode of the battery, which is used to connect to the one-way valve.

[0014] According to the present invention, a downhole self-generating sliding impact permeation enhancement device is provided, wherein a grooved track is provided along the axial direction on the outer peripheral surface of the hollow tube, and a plurality of one-way valves are distributed in the grooved track; a guide protrusion is formed on the inner wall of the sliding sleeve to cooperate with the grooved track, and the oxidant inlet is provided on the guide protrusion.

[0015] According to the present invention, a downhole self-generating sliding impact permeation enhancement device is provided, wherein the hydraulic drive mechanism includes a hydraulic storage tank and a plurality of hydraulic chambers communicating with the hydraulic storage tank, and the plurality of hydraulic chambers form a plurality of hydraulic drive ports through a hydraulic system for providing hydraulic power.

[0016] According to the present invention, a downhole self-generating sliding impact permeation enhancement device is provided, wherein the downhole self-generating sliding impact permeation enhancement device further includes a controller, which is connected to the sliding drive mechanism and the hydraulic drive mechanism respectively, and is used to receive ground control signals or control the sliding drive mechanism and the hydraulic drive mechanism based on a built-in preset control program.

[0017] The present invention also provides a method for increasing the production of energy resources through underground gasification, applicable to any of the above-mentioned downhole self-generating sliding impact permeation enhancement devices, wherein the method for increasing the production of energy resources through underground gasification includes the following steps S1 to S7.

[0018] S1. Select a horizontal well that penetrates the energy resource layer as the injection well, and select a vertical well that communicates with the injection well as the production well.

[0019] S2. The underground gasification pipe string is lowered into the injection well. The sliding sleeve is driven to move on the outer circumference of the base pipe string by the sliding drive mechanism, so that the sliding sleeve moves to the first predetermined position in the energy resource layer. The impact hammer is driven by the hydraulic drive mechanism to impact the well wall of the energy resource rock at the first predetermined position in the energy resource layer to create fractures and increase permeability.

[0020] S3. Drag the underground gasification pipe string backward to position the ignition device in the first predetermined position in the energy resource layer, and drive the sliding sleeve to move on the outer circumferential surface of the base pipe column through the sliding drive mechanism, so that the sliding sleeve moves to the second predetermined position in the energy resource layer.

[0021] S4. Ignition is performed by the ignition device to form a first gasification chamber at a first predetermined position in the energy resource layer for energy resource gasification; at the same time, the impact hammer is driven by the hydraulic drive mechanism to impact the well wall of the energy resource rock at a second predetermined position in the energy resource layer to create fractures and increase permeability.

[0022] S5. Drag the underground gasification pipe string backward so that the ignition device is located in the second predetermined position in the energy resource layer, and drive the sliding sleeve to move on the outer circumferential surface of the base pipe column through the sliding drive mechanism so that the sliding sleeve moves to the third predetermined position in the energy resource layer.

[0023] S6. Ignition is performed by the ignition device to form a second gasification chamber at a second predetermined position in the energy resource layer for energy resource gasification; at the same time, the impact hammer is driven by the hydraulic drive mechanism to impact the energy resource rock well wall at a third predetermined position in the energy resource layer to create fractures and increase permeability.

[0024] S7. Repeat steps S3 to S6 to sequentially perform fracture-making and permeability enhancement and energy resource gasification at all predetermined locations in the energy resource layer. The crude resource gas formed after energy resource gasification flows from the production well to the surface crude resource gas treatment device.

[0025] The downhole self-generating sliding impact permeation device provided by this invention integrates self-generating power, sliding displacement, and mechanical impact permeation functions into a sleeve-like structure that can move along the tubing string. This allows for targeted, segmented impact fracture creation of the wellbore in the energy resource layer without relying on external cable power supply or affecting the existing gasification process. Mechanical permeation of the energy resource rock wellbore using an impact hammer expands the gasification reaction area and improves gas production efficiency without increasing the number or diameter of wells. Downhole in-situ power generation is achieved using gasification byproducts (crude coal gas) and an injection agent (oxidant), eliminating dependence on surface cable power supply and adapting to deep well and long-distance operating environments. The entire moving and impact structure is integrated within the sliding sleeve, resulting in a compact structure that enables segmented impact. This allows for continuous permeation pretreatment of the energy resource layer over long distances and at multiple locations without affecting the existing gasification process, significantly improving operational continuity and economy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the downhole self-generating sliding impact permeation enhancement device provided by the present invention.

[0028] Figure 2 This is a front view of the base column provided by the present invention.

[0029] Figure 3 This is a top view of the base column provided by the present invention.

[0030] Figure 4 This is a left view of the base column provided by the present invention.

[0031] Figure 5 This is a schematic diagram of the process of the underground coal gasification production enhancement method provided in the embodiment of the present invention.

[0032] Reference numerals: 1. Coiled tubing; 2. Base tubing string; 201. Hollow tubing body; 202. Ignition cable channel; 203. Oxidant channel; 204. Check valve; 205. Grooved track; 3. Ignition device; 4. Sliding sleeve; 5. Impact hammer; 6. Telescopic support column; 7. Inner sliding wheel; 8. Outer sliding wheel; 9. Hydraulic spring; 10. Fuel cell; 101. Battery reaction tank; 102. Battery anode; 103. Battery cathode; 11. Energy storage device; 12. Raw gas inlet; 13. Oxidant inlet; 14. Hydraulic reservoir; 15. Hydraulic chamber; 16. Controller. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0036] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The following is combined with Figures 1 to 5 This invention describes a downhole self-generating sliding impact permeation enhancement device and a method for increasing underground gasification of energy resources.

[0039] One embodiment of the present invention provides a downhole self-generating sliding impact permeation enhancement device, combined with Figure 1 and Figure 5 As shown, the downhole self-generating sliding impact permeation enhancement device includes an underground gasification pipe string, a sliding sleeve 4, a sliding drive mechanism, an impact hammer 5, a hydraulic drive mechanism, and a self-generating mechanism. The underground gasification pipe string includes a continuous tubing 1, a base tubing string 2, and an ignition device 3 connected in sequence. The sliding sleeve 4 is slidably fitted onto the outer circumferential surface of the base tubing string 2. The sliding drive mechanism is located on the sliding sleeve 4 and is used to drive the sliding sleeve 4 to move on the outer circumferential surface of the base tubing string 2. The impact hammer 5 is retractably located on the outer circumferential surface of the sliding sleeve 4 and is used to impact the coal and rock well wall to form cracks. The hydraulic drive mechanism is connected to the impact hammer 5. The self-generating mechanism is located inside the sleeve wall of the sliding sleeve 4 and is connected to the sliding drive mechanism and the hydraulic drive mechanism to provide working power.

[0040] It is understood that this downhole self-generating sliding impact permeation enhancement device integrates self-generating power, sliding displacement, and mechanical impact permeation enhancement functions into a sleeve-like structure that can move along the tubing string. This allows for targeted, segmented impact fracture creation of the coal seam well wall without relying on external cable power supply or affecting the existing gasification process. The downhole self-generating sliding impact permeation enhancement device mainly consists of an underground gasification tubing string, a sliding sleeve 4, a sliding drive mechanism, an impact hammer 5, a hydraulic drive mechanism, and a self-generating mechanism. The underground gasification tubing string includes a continuous tubing 1, a base tubing string 2, and an ignition device 3 connected in sequence. The sliding sleeve 4 is slidably fitted onto the outer circumference of the base tubing string 2 and moves autonomously along the tubing string axis via the sliding drive mechanism. The impact hammer 5 is located on the outer circumference of the sliding sleeve 4 and can mechanically impact the coal and rock well wall under the action of the hydraulic drive mechanism, forming cracks to expand the gasification reaction area. The self-generating mechanism is integrated inside the sliding sleeve 4. It uses the crude coal gas generated during the gasification process and the injected oxidant to generate electricity in situ, providing continuous power to the sliding drive mechanism and the hydraulic drive mechanism without the need for external power supply.

[0041] During underground coal gasification, a self-generating generator enables energy self-sufficiency, driving the sliding sleeve 4 to move along the base tubing 2 to the target position. Subsequently, a hydraulic drive mechanism drives the impact hammer 5 to perform directional impact on the coal and rock well wall, forming an artificial fracture network. This allows for pretreatment and permeability enhancement of the subsequent gasification area without interfering with the normal operation of the preceding gasification chamber. The entire system can autonomously complete movement, positioning, impact, and energy recovery underground, forming a continuous operation cycle of movement-impact-permeability enhancement.

[0042] It should be understood that in this embodiment, mechanical permeability enhancement of the coal and rock well wall is achieved by impact hammer 5, which can expand the gasification reaction area and improve gas production efficiency without increasing the number and diameter of wells. In-situ power generation is achieved by using gasification byproducts (crude coal gas) and injection agent (oxidant), eliminating the dependence on power supply from the ground cable and adapting to deep well and long-distance operation environments. The system is integrated into the sliding sleeve 4, with a compact structure, and can realize segmented impact. It can achieve continuous permeability pretreatment of coal seams over long distances and at multiple locations without affecting the existing gasification process, which greatly improves the continuity and economy of operation.

[0043] In some embodiments of the downhole self-generating sliding impact permeation enhancement device of the present invention, see again Figure 1As shown, multiple telescopic support columns 6 are respectively arranged near both ends on the outer circumference of the sliding sleeve 4. These telescopic support columns 6 are evenly distributed along the circumference of the sliding sleeve 4. The telescopic support columns 6 are rotatably mounted on the outer circumference of the sliding sleeve 4 via a first electric hinge shaft, which is connected to a self-generating mechanism. The telescopic support columns 6 are also connected to a hydraulic drive mechanism. Multiple impact hammers 5 are also present, evenly distributed along the circumference of the sliding sleeve 4. The impact hammers 5 are rotatably mounted on the outer circumference of the sliding sleeve 4 via a second electric hinge shaft, which is connected to the self-generating mechanism.

[0044] It is understood that in the downhole self-generated sliding impact permeation enhancement device of this embodiment, multiple sets of telescopic support columns 6 are evenly arranged circumferentially at both ends of the outer peripheral surface of the sliding sleeve 4. These telescopic support columns 6 are connected to the sliding sleeve 4 through a first electric hinge shaft and their telescopic movement is controlled by a hydraulic drive mechanism. At the same time, multiple sets of impact hammers 5 are also distributed circumferentially on the sliding sleeve 4. Each set of impact hammers 5 is installed through an independent second electric hinge shaft and is also powered by a self-generated mechanism to achieve precise angle adjustment.

[0045] In the specific implementation process, after the device moves to the target working position, firstly, under control commands, the first electric articulated shaft drives each telescopic support column 6 to rotate and unfold to a direction perpendicular to the sliding sleeve 4. The hydraulic drive mechanism drives each telescopic support column 6 to extend synchronously, so that its ends are firmly supported on the well wall, forming a stable mechanical support structure, providing a reliable force foundation for subsequent impact operations. Subsequently, under control commands, the second electric articulated shaft drives the impact hammer 5 to adjust to the optimal impact angle. The hydraulic drive mechanism then controls the impact hammer 5 to perform reciprocating impact motion, implementing multi-point, multi-angle mechanical impact on the coal and rock well wall. After the operation is completed, the telescopic support columns 6 and the impact hammer 5 can be retracted to the outer circumference of the sliding sleeve 4, allowing the device to return to its sliding state, facilitating the movement of the working position.

[0046] It is important to understand that the circumferentially evenly arranged telescopic support columns 6 form a distributed support system, significantly improving the overall stability of the device during the impact process, effectively suppressing the offset and vibration caused by the recoil force, and ensuring impact accuracy and operational safety. Multiple sets of impact hammers 5, combined with an adjustable-angle hinge structure, can achieve full-circumferential coverage impact on the wellbore, not only improving single-point operation efficiency but also forming a three-dimensional, interwoven fracture network in the coal seam, greatly expanding the gasification reaction area. The coordinated control of the electric hinge and hydraulic drive enables programmed and automated operation of the support and impact actions, reducing the need for manual intervention and improving the continuity and reliability of downhole operations.

[0047] In some embodiments of the downhole self-generating sliding impact permeation enhancement device of the present invention, see also Figure 1As shown, the sliding drive mechanism includes an inner sliding wheel 7 and an outer sliding wheel 8. The inner sliding wheel 7 is mounted on the inner circumferential surface of the sliding sleeve 4 via a hydraulic spring 9, and the outer sliding wheel 8 is mounted on the outer circumferential surface of the sliding sleeve 4 via a hydraulic spring 9. The hydraulic spring 9 is connected to the hydraulic drive mechanism. The inner sliding wheel 7 and the outer sliding wheel 8 are also respectively connected to a drive motor, and the drive motor is connected to a self-generating mechanism.

[0048] It is understood that the sliding drive mechanism in this embodiment adopts a composite transmission structure with inner and outer dual wheels working together. This mechanism includes an inner sliding wheel 7 mounted on the inner circumferential surface of the sliding sleeve 4 and an outer sliding wheel 8 mounted on the outer circumferential surface of the sliding sleeve 4. The two wheels are respectively connected to the sliding sleeve 4 via hydraulic springs 9. The hydraulic springs 9 are connected to the hydraulic drive mechanism inside the device, which can adjust the extension length and clamping force of the wheel body; at the same time, the inner sliding wheel 7 and the outer sliding wheel 8 are each connected to an independent drive motor, which is powered by a self-generating mechanism.

[0049] During implementation, when the device needs to move along the base tubing 2, the hydraulic drive mechanism first supplies fluid to the hydraulic spring 9, causing the inner sliding wheel 7 to press inward against the outer surface of the base tubing 2 and the outer sliding wheel 8 to press outward against the inner surface of the well wall, forming a combined contact state of clamping and support. Subsequently, under control commands, the two drive motors synchronously drive the inner and outer sliding wheels to rotate in opposite directions, using the friction between the wheel surface and the contact surface to drive the entire sliding sleeve 4 to move smoothly along the axial direction of the base tubing 2. After moving to the designated position, the hydraulic spring 9 can retract the wheel body, reducing travel resistance or facilitating system positioning.

[0050] It is important to understand that the synchronous clamping of the inner and outer dual wheels in this embodiment forms a stable force-sealed structure, ensuring guiding accuracy during movement and preventing circumferential slippage or deviation. This is particularly suitable for reliable travel in inclined or curved well sections. The active adjustment capability of the hydraulic spring 9 allows the wheels to adapt to changes in the gap between the tubing string and the wellbore wall, as well as surface irregularities, improving the adaptability and reliability of the mechanism to different well conditions. Independent drive of the inner and outer wheels enables differential speed adjustment and even steering assistance, enhancing the mobility and control flexibility of the device in complex wellbore trajectories and providing reliable mobility assurance for long-distance, multi-position continuous operations.

[0051] In some embodiments of the downhole self-generating sliding impact permeation enhancement device of the present invention, the self-generating mechanism is a fuel cell 10. The fuel cell 10 is one of a proton exchange membrane fuel cell, an alkaline fuel cell, a phosphoric acid fuel cell, a molten carbonate fuel cell, and a solid oxide fuel cell. The fuel cell 10 includes a battery reaction tank 101 and a battery anode 102 and a battery cathode 103 located at both ends of the battery reaction tank 101.

[0052] It is understood that the self-generating mechanism in this embodiment uses a fuel cell 10 as the core power supply unit. The fuel cell 10 can be selected from, but is not limited to, any type of proton exchange membrane fuel cell, alkaline fuel cell, phosphoric acid fuel cell, molten carbonate fuel cell, or solid oxide fuel cell, and its basic structure includes a battery reaction cell 101, a battery anode 102, and a battery cathode 103.

[0053] In its implementation, the device utilizes the crude coal gas generated during underground coal gasification as a fuel source, guiding it to the battery anode 102 through the crude gas inlet 12 (the crude coal gas inlet) located on the outer circumference of the sliding sleeve 4. Simultaneously, oxidant (such as air or pure oxygen) obtained from the oxidant channel 203 of the base tubing 2 is transported to the battery cathode 103. Within the battery reaction tank 101, the fuel and oxidant undergo an electrochemical reaction, directly converting chemical energy into electrical energy. The generated electricity provides power for the sliding drive mechanism, hydraulic drive mechanism, and various electric actuators. This power generation process requires no combustion and has no mechanical rotating parts, enabling continuous and stable operation within the high temperature, high pressure, and confined space underground.

[0054] It is important to understand that this embodiment achieves on-site energy conversion and utilization, transforming the crude coal gas, a byproduct of gasification, into clean electrical energy to drive the device. This forms a closed-loop energy utilization model of generating electricity from gas and promoting production with electricity, eliminating dependence on ground power transmission and making it suitable for operations in deep wells, long distances, and areas without grid coverage. The fuel cell 10 has high power generation efficiency and rapid response, providing stable and adjustable power output to the hydraulic system, electric articulated shaft, and drive motor, ensuring coordinated execution and precise control of multiple actions such as impact, support, and movement.

[0055] Furthermore, an energy storage device 11 is also provided inside the sliding sleeve 4. The energy storage device 11 is electrically connected to the self-generating mechanism and is used to store the electrical energy released by the self-generating mechanism. The energy storage device 11 is also connected to the sliding drive mechanism and the hydraulic drive mechanism respectively.

[0056] It is understandable that, in order to further improve the reliability and operational continuity of the energy system, an energy storage device 11 is integrated inside the sliding sleeve 4 in this embodiment. The energy storage device 11 is directly electrically connected to the self-generating mechanism and can store the electrical energy generated by the fuel cell 10 in real time. At the same time, the energy storage device 11 is also electrically connected to the sliding drive mechanism and the hydraulic drive mechanism to form a complete power supply-storage-consumption circuit.

[0057] During implementation, when the fuel cell is operating normally, the electrical energy it generates is directly supplied to the various actuators, and excess electrical energy is stored in the energy storage device. When fluctuations in the gasification process cause instability in the supply of crude gas, a decrease in the output power of the fuel cell, or a temporary interruption, the energy storage device 11 can seamlessly switch to power supply mode, continuing to provide continuous power to key loads such as the slip drive motor, hydraulic pump station, control circuit, and electric articulated shaft, ensuring that impact, support, and movement operations are performed continuously without interference. In addition, under transient high-load conditions such as device startup, high-power impact, or rapid movement, the energy storage device 11 can work in tandem with the fuel cell 10 to provide instantaneous power supplementation to meet the system's peak power requirements.

[0058] In some embodiments of the downhole self-generating sliding impact permeation enhancement device of the present invention, combined with Figure 2 , Figure 3 and Figure 4 As shown, the base column 2 includes a hollow tube 201. An ignition cable channel 202 for connecting to the ignition device 3 is axially arranged inside the hollow tube 201. An oxidant channel 203 is formed between the ignition cable channel 202 and the inner wall of the hollow tube 201. Multiple one-way valves 204 communicating with the oxidant channel 203 are installed on the hollow tube 201. A rough gas inlet 12 is provided on the outer circumferential surface of the sliding sleeve 4, connecting to the battery anode 102. An oxidant inlet 13 is provided on the inner circumferential surface of the sliding sleeve 4, connecting to the battery cathode 103. The oxidant inlet 13 is used to connect to the one-way valves 204.

[0059] It is understood that the base string 2 in this embodiment adopts a hollow tube structure with integrated multi-functional channels. An independent ignition cable channel 202 is provided axially inside for laying control and power supply cables connecting the ignition device 3. An annular oxidant channel 203 is formed between the ignition cable channel 202 and the inner wall of the hollow tube 201 for continuously supplying the oxidant (such as air or oxygen) required for gasification to the downhole. Multiple one-way valves 204 are spaced axially on the outer wall of the hollow tube 201. These valves only allow the oxidant to flow out unidirectionally from the inside of the base string 2, effectively preventing backflow of fluids or impurities into the well. Correspondingly, the sliding sleeve 4 is provided with a crude gas inlet 12 (the inlet of crude coal gas) and an oxidant inlet 13. The crude gas inlet 12 is located on the outer periphery of the sleeve and is used to collect the crude coal gas generated in the gasification chamber and transport it to the battery anode 102. The oxidant inlet 13 is located on the inner periphery of the sleeve and is connected to the battery cathode 103. Its position is designed to selectively dock with the one-way valve 204 on the base column 2.

[0060] In the specific implementation process, when the sliding sleeve 4 moves along the base column 2 to a certain working position, the oxidant inlet 13 on its inner wall will automatically align with and connect with the one-way valve 204 at the corresponding position. At this time, the oxidant in the oxidant channel 203 is stably supplied to the battery cathode 103 through the one-way valve 204; at the same time, the crude coal gas generated by the gasification reaction is led to the battery anode 102 through the crude gas inlet 12. The two undergo an electrochemical reaction in the battery reaction tank 101 to continuously generate electricity, providing power for the operation of the device, realizing the local, real-time, and directional supply of fuel and oxidant, and the oxidant delivery and ignition control are independent of each other and do not interfere with each other.

[0061] It is important to understand that this embodiment significantly simplifies the downhole tubing structure and improves system reliability and deployment efficiency by integrating the ignition cable channel 202 and the oxidant channel 203 into the same hollow tube 201 and isolating them from each other. This also ensures the stability and safety of the ignition signal and oxidant supply. The design of the one-way valve 204 ensures directional oxidant supply and effectively avoids backflow contamination from complex media (such as coal powder, water, or reaction products) in the well, protecting the cleanliness of the oxidant channel 203 and the fuel cell intake system. The aligned connection between the oxidant inlet 13 on the sliding sleeve 4 and the one-way valve 204 on the tube body enables a coordinated operation mode of movement and power generation. This allows the device to obtain oxidant from the main channel at any time during its sliding along the wellbore and combine it with local gasification products to generate electricity, achieving on-demand energy access and dynamic self-sufficiency, supporting continuous long-distance, segmented impact permeation enhancement operations.

[0062] Furthermore, a grooved track 205 is provided along the axial direction on the outer circumferential surface of the hollow tube body 201, and multiple one-way valves 204 are distributed in the grooved track 205; the inner wall of the sliding sleeve 4 is formed with a guide protrusion that cooperates with the grooved track 205, and the oxidant inlet 13 is located on the guide protrusion.

[0063] It is understood that, in this embodiment, a grooved track 205 is axially arranged on the outer circumferential surface of the hollow tube 201. The grooved track 205 not only serves as a guide structure for the movement of the sliding sleeve 4, but also has multiple one-way valves 204 spaced apart inside for connecting the oxidant channel 203. Correspondingly, the inner wall of the sliding sleeve 4 is provided with a guide protrusion that matches the shape of the grooved track 205. This protrusion can be embedded in the track and slide, realizing precise axial guidance and circumferential limiting of the device. Furthermore, the oxidant inlet 13 is directly disposed on the guide protrusion, so that it is always aligned with the array of one-way valves 204 inside the grooved track 205 during the sliding process.

[0064] During implementation, as the sliding sleeve 4 moves along the base column 2, the guide protrusion on its inner wall slides along the grooved track 205, ensuring the directional stability of the device and effectively preventing circumferential rotation or deviation. When the sliding sleeve 4 moves to the target position, the oxidant inlet 13 on the guide protrusion will automatically align with the corresponding one-way valve 204 in the grooved track 205 and form a sealed connection, thereby achieving a stable supply of oxidant from the inside of the column to the fuel cell cathode without additional alignment operations. The device maintains the plug-and-play functionality of the fuel supply channel during the alternation of continuous sliding and intermittent operation.

[0065] In some embodiments of the downhole self-generating sliding impact permeation enhancement device of the present invention, the hydraulic drive mechanism includes a hydraulic storage tank 14 and a plurality of hydraulic chambers 15 connected to the hydraulic storage tank 14. The plurality of hydraulic chambers 15 form a plurality of hydraulic drive ports through a hydraulic system for providing hydraulic power.

[0066] It is understood that the hydraulic drive mechanism in this embodiment adopts a modular and distributed design. Its core includes a centrally located hydraulic reservoir 14 and multiple independent hydraulic chambers 15 connected to it. These hydraulic chambers 15 are interconnected through a hydraulic pipeline system integrated inside the sliding sleeve 4, and each forms multiple independent hydraulic drive ports, which are respectively connected to the impact hammer 5, the telescopic support column 6 and the hydraulic spring 9 in the sliding drive mechanism, forming a compact hydraulic power network that can be controlled in sections.

[0067] In practical implementation, the hydraulic reservoir 14 serves as the system's hydraulic oil source and buffer container, continuously providing a stable and clean working medium to each hydraulic chamber. The control system can precisely control the sequence, speed, and force of each actuator by adjusting the pressure and flow rate within the corresponding hydraulic chamber 15 according to the work instructions. For example, during the impact operation phase, the hydraulic chamber 15 corresponding to the impact hammer 5 rapidly builds pressure, driving the hammer body to perform high-frequency impact; during the movement phase, it controls the movement of the chamber connected to the hydraulic spring 9, adjusting the clamping and releasing of the sliding wheel; and during the support phase, it drives the hydraulic chamber 15 of the telescopic support column 6 to achieve stable extension and locking. All hydraulic actions are automatically controlled by the electric hydraulic pump and control valve group powered by the device's self-generated power system.

[0068] The distributed multi-chamber structure 15 achieves decoupling and precise distribution of power output, enabling multiple functions such as impact, support, and movement to operate independently or collaboratively without interference, significantly improving the system's control flexibility and operational efficiency. The integrated hydraulic reservoir 14 and compact piping layout maximize the use of limited downhole space while ensuring hydraulic medium circulation and thermal management, improving the system's reliability and durability in high-temperature downhole environments. The hydraulic drive system features high output force, fast response speed, and strong impact load resistance, making it particularly suitable for driving the impact hammer 5 to achieve high-intensity rock breaking operations. Furthermore, it can adapt to the permeability enhancement requirements of coal and rock strata of varying hardness through pressure regulation, enhancing the device's geological adaptability.

[0069] In some embodiments of the downhole self-generating sliding impact permeation enhancement device of the present invention, the downhole self-generating sliding impact permeation enhancement device further includes a controller 16, which is connected to the sliding drive mechanism and the hydraulic drive mechanism respectively, and is used to receive ground control signals or control the sliding drive mechanism and the hydraulic drive mechanism based on a built-in preset control program.

[0070] It is understood that the downhole self-generating sliding impact permeation enhancement device in this embodiment integrates a dedicated controller 16 as the intelligent command center of the entire system. The controller 16 is electrically connected to key subsystems such as the sliding drive mechanism, hydraulic drive mechanism, self-generating mechanism, and energy storage device 11 via wired or wireless means, and has the functions of signal reception, logic processing, and command issuance. The controller 16 can receive real-time control commands sent from the surface through coiled tubing or dedicated signal cables, and can also execute pre-stored automated operation programs to achieve remote control or autonomous operation of the downhole device.

[0071] During implementation, the controller 16 continuously monitors the status signals of each mechanism (such as position, pressure, current, etc.) and generates control strategies based on received ground commands or built-in programs. For example, upon receiving the command to "move to the next work point," the controller 16 will systematically activate the hydraulic drive mechanism to release the support, adjust the clamping force of the sliding wheel, and then control the operation of the sliding drive motor to achieve precise positioning. After reaching the predetermined position, it automatically triggers a series of operations such as support extension and impact hammer action, forming a complete movement-support-impact operation cycle. Throughout the process, the controller 16 can also fine-tune the action parameters based on real-time feedback to ensure the accuracy and adaptability of the operation.

[0072] In another aspect, this invention provides a method for increasing underground gasification production of energy resources, applicable to the underground self-generating sliding impact permeation enhancement device in any of the above embodiments or examples. In some specific embodiments, taking underground coal gasification as an example, by integrating impact permeation enhancement operations with staged gasification processes, active and orderly permeation pretreatment of the coal seam is achieved during continuous production. See also Figure 5 As shown, the energy resource underground gasification production enhancement method of the present invention (specifically, the coal underground gasification production enhancement method) includes the following steps S1 to S7.

[0073] S1. Select a horizontal well that penetrates the coal seam as the injection well, and select a vertical well that communicates with the injection well as the production well.

[0074] This step involves well network layout. Specifically, a horizontal well penetrating the target coal seam is selected as the injection well, used to run an underground gasification pipe string integrated with a self-generating impact permeation enhancement device; simultaneously, a vertical well connected to the injection well in the coal seam area is selected as the production well, used to export the crude coal gas produced by the gasification reaction to the surface processing system.

[0075] S2. The underground gasification pipe string is lowered into the injection well. The sliding sleeve 4 is driven to move on the outer circumference of the base pipe string 2 by the sliding drive mechanism, so that the sliding sleeve 4 moves to the first predetermined position in the coal seam. The impact hammer 5 is driven by the hydraulic drive mechanism to impact the coal and rock well wall at the first predetermined position in the coal seam to create fractures and increase permeability.

[0076] This step involves the initial permeability enhancement pretreatment. Specifically, an underground gasification tubing string is lowered into the injection well. This string includes a continuous tubing 1, a base tubing string 2, and an ignition device 3 connected in sequence. A sliding sleeve 4 is fitted around the base tubing string 2 via a sliding drive mechanism (such as a combination of an inner sliding wheel 7 and an outer sliding wheel 8 with a hydraulic spring 9). First, the sliding drive mechanism is controlled to drive the sliding sleeve 4 to move independently along the base tubing string 2 to a first predetermined position in the coal seam. Subsequently, a hydraulic drive mechanism (including a hydraulic storage tank 14 and multiple hydraulic chambers 15) drives the impact hammer 5 on the sliding sleeve 4 to perform circumferential multi-point impacts on the coal and rock well wall at this position, forming an artificial fracture network and completing the initial permeability enhancement pretreatment. During this process, the device can maintain stable movement through the cooperation of the guide protrusion and the grooved track 205, and the telescopic support column 6 can extend to provide support during impact.

[0077] S3. Drag the underground gasification pipe string backward so that the ignition device 3 is located in the first predetermined position in the coal seam, and drive the sliding sleeve 4 to move on the outer circumferential surface of the base pipe column 2 through the sliding drive mechanism so that the sliding sleeve 4 moves to the second predetermined position in the coal seam.

[0078] This step involves towing the pipeline string and moving the equipment forward. Specifically, the entire underground gasification pipeline string is towed backward using the equipment via the surface continuous tubing 1, moving the ignition device 3 to the first predetermined position after permeation enhancement. Simultaneously, the sliding drive mechanism drives the sliding sleeve 4 to continue adjusting and moving along the base tubing string 2 to the second predetermined position, preparing for the next stage of impact operation. During this process, the relative movement of the sliding sleeve 4 and the pipeline string enables the advance placement of the operation point.

[0079] S4. Ignition is performed by ignition device 3 to form a first gasification chamber at a first predetermined position in the coal seam for coal gasification; at the same time, the impact hammer 5 is driven by hydraulic drive mechanism to impact the coal and rock well wall at a second predetermined position in the coal seam to create fractures and increase permeability.

[0080] This step involves the initial gasification and subsequent permeation enhancement. Specifically, after the ignition device 3 is positioned in the first predetermined location, an ignition signal is transmitted through the ignition cable channel 202 to ignite the coal seam and introduce oxidant supplied by the oxidant channel 203, forming the first gasification chamber and initiating continuous gasification production. Simultaneously, the sliding sleeve 4, which has moved to the second predetermined location, is powered by the self-generating mechanism (the fuel cell 10 generates electricity using the crude coal gas produced in the first gasification chamber and the oxidant supplied by the base tubing 2) and the energy storage device 11. The hydraulic drive mechanism then drives the impact hammer 5 to impact and enhance permeation of the coal and rock well wall at the second predetermined location. The two stages of operation are spatially separate but temporally overlapping, without interfering with each other.

[0081] S5. Drag the underground gasification pipe string backward so that the ignition device 3 is located in the second predetermined position in the coal seam, and drive the sliding sleeve 4 to move on the outer circumferential surface of the base pipe column 2 through the sliding drive mechanism, so that the sliding sleeve 4 moves to the third predetermined position in the coal seam.

[0082] S6. Ignition is performed by ignition device 3 to form a second gasification chamber at a second predetermined position in the coal seam for coal gasification; at the same time, the impact hammer 5 is driven by hydraulic drive mechanism to impact the coal and rock well wall at a third predetermined position in the coal seam to create fractures and increase permeability.

[0083] Steps S5 and S6 are repeated cyclically. Specifically, during the continuous vaporization in the first vaporization chamber, steps S3 and S4 are repeated: the dragging tube string brings the ignition device 3 to the second predetermined position, forming the second vaporization chamber; simultaneously, the sliding sleeve 4 continues to be adjusted to the third predetermined position and performs impact permeation enhancement. This forms a synchronous rolling operation process of "production in the previous vaporization chamber, permeation enhancement in the next section, and ignition device following up segment by segment".

[0084] S7. Repeat steps S3 to S6 to sequentially perform fracture-making and permeability enhancement and coal gasification at all predetermined locations in the coal seam. The crude coal gas formed after coal gasification flows from the production well to the surface crude coal gas treatment device.

[0085] This step enables continuous operation. Specifically, the steps of string towing, device relocation, and parallel gasification and permeation enhancement are repeated, sequentially performing fracture-making and permeation enhancement and coal gasification at all predetermined locations in the coal seam. Throughout the process, crude gas flows to the production well via artificial fractures and natural channels, and is ultimately delivered to the surface crude gas treatment unit. The unit continuously generates its own power using the gasification chamber products upstream of its location and the oxidant delivered by the string, and achieves full-process automation or remote ground control via controller 16.

[0086] It is understood that this underground coal gasification production enhancement method, as described in this embodiment, is based on a U-shaped well structure consisting of horizontal and vertical wells. A string of tubing containing an impact permeation enhancement device is lowered into the coal seam via a surface coiled tubing system. First, the impact permeation enhancement device is moved to the first target location in the coal seam to create fractures and enhance permeability. Then, the tubing string is moved to position the ignition device, forming the first gasification chamber and initiating gasification. Simultaneously, the impact device continues to move forward to the next location for advanced permeation enhancement. This cycle is repeated, achieving a parallel operation mode of "front-end gasification production, rear-end advanced permeation enhancement" on the same tubing string, until the gasification development of the entire coal seam is completed. During stable gas production in any gasification chamber, the impact permeation enhancement device has already pre-built a fracture network in the ungasified area in front of it. Therefore, when the tubing string is moved backward and the ignition device enters that area, the coal seam already has a larger reaction surface area and permeation channels, allowing it to immediately enter a highly efficient gasification state. Through the superposition of spatial and temporal processes, the permeation pretreatment and gasification production are seamlessly connected, significantly shortening the start-up and production time of the gasification chamber.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A downhole self-generating sliding impact permeation enhancement device, characterized in that, include: The underground gasification pipe string includes a continuous oil pipe (1), a base pipe string (2), and an ignition device (3) connected in sequence. The sliding sleeve (4) is slidably fitted onto the outer circumferential surface of the base column (2); A sliding drive mechanism is provided on the sliding sleeve (4) for driving the sliding sleeve (4) to move on the outer circumferential surface of the base column (2); An impact hammer (5) is retractably disposed on the outer peripheral surface of the sliding sleeve (4) for impacting the well wall to form cracks; A hydraulic drive mechanism is connected to the impact hammer (5). A self-generating mechanism is installed inside the sleeve wall of the sliding sleeve (4). The self-generating mechanism is connected to the sliding drive mechanism and the hydraulic drive mechanism to provide working power.

2. The downhole self-generating sliding impact permeation enhancement device according to claim 1, characterized in that, Multiple telescopic support columns (6) are respectively provided on the outer peripheral surface of the sliding sleeve (4) near both ends. The multiple telescopic support columns (6) are evenly arranged along the circumference of the sliding sleeve (4). The telescopic support columns (6) are rotatably disposed on the outer peripheral surface of the sliding sleeve (4) through a first electric hinge shaft. The first electric hinge shaft is connected to the self-generating mechanism, and the telescopic support columns (6) are connected to the hydraulic drive mechanism. And / or, There are multiple impact hammers (5), and the multiple impact hammers (5) are evenly arranged around the circumference of the sliding sleeve (4). The impact hammers (5) are rotatably mounted on the outer circumferential surface of the sliding sleeve (4) via a second electric hinge shaft, which is connected to the self-generating mechanism.

3. The downhole self-generating sliding impact permeation enhancement device according to claim 1, characterized in that, The sliding drive mechanism includes an inner sliding wheel (7) and an outer sliding wheel (8). The inner sliding wheel (7) is mounted on the inner circumferential surface of the sliding sleeve (4) by a hydraulic spring (9), and the outer sliding wheel (8) is mounted on the outer circumferential surface of the sliding sleeve (4) by a hydraulic spring (9). The hydraulic spring (9) is connected to the hydraulic drive mechanism. The inner sliding wheel (7) and the outer sliding wheel (8) are also respectively connected to a drive motor, and the drive motor is connected to the self-generating mechanism.

4. The downhole self-generating sliding impact permeation enhancement device according to claim 1, characterized in that, The self-generating mechanism is a fuel cell (10), which is one of a proton exchange membrane fuel cell, an alkaline fuel cell, a phosphoric acid fuel cell, a molten carbonate fuel cell, and a solid oxide fuel cell. The fuel cell (10) includes a battery reaction cell (101) and a battery anode (102) and a battery cathode (103) located at both ends of the battery reaction cell (101).

5. The downhole self-generating sliding impact permeation enhancement device according to claim 4, characterized in that, An energy storage device (11) is also provided inside the sliding sleeve (4). The energy storage device (11) is electrically connected to the self-generating mechanism and is used to store the electrical energy released by the self-generating mechanism. The energy storage device (11) is also connected to the sliding drive mechanism and the hydraulic drive mechanism respectively.

6. The downhole self-generating sliding impact permeation enhancement device according to claim 4, characterized in that, The base column (2) includes a hollow tube (201), and an ignition cable channel (202) for connecting the ignition device (3) is provided axially inside the hollow tube (201). An oxidant channel (203) is formed between the ignition cable channel (202) and the inner wall of the hollow tube (201). A plurality of one-way valves (204) communicating with the oxidant channel (203) are provided on the hollow tube (201). The outer circumferential surface of the sliding sleeve (4) is provided with a rough gas inlet (12), which is connected to the battery anode (102). The inner circumferential surface of the sliding sleeve (4) is provided with an oxidant inlet (13) connected to the battery cathode (103), which is used to connect to the one-way valve (204).

7. The downhole self-generating sliding impact permeation enhancement device according to claim 6, characterized in that, The hollow tube (201) has a grooved track (205) arranged axially on its outer peripheral surface, and multiple one-way valves (204) are distributed in the grooved track (205); the inner wall of the sliding sleeve (4) has a guide protrusion that cooperates with the grooved track (205), and the oxidant inlet (13) is located on the guide protrusion.

8. The downhole self-generating sliding impact permeation enhancement device according to any one of claims 1 to 7, characterized in that, The hydraulic drive mechanism includes a hydraulic reservoir (14) and a plurality of hydraulic chambers (15) connected to the hydraulic reservoir (14). The plurality of hydraulic chambers (15) form a plurality of hydraulic drive ports through a hydraulic system for providing hydraulic power.

9. The downhole self-generating sliding impact permeation enhancement device according to any one of claims 1 to 7, characterized in that, The downhole self-generating sliding impact permeation enhancement device also includes a controller (16), which is connected to the sliding drive mechanism and the hydraulic drive mechanism respectively, and is used to receive ground control signals or control the sliding drive mechanism and the hydraulic drive mechanism based on the built-in preset control program.

10. A method for increasing energy production through underground gasification, characterized in that, The downhole self-generating sliding impact permeation enhancement device according to any one of claims 1 to 9 comprises: S1. Select a horizontal well that penetrates the energy resource layer as the injection well, and select a vertical well that communicates with the injection well as the production well; S2. The underground gasification pipe string is lowered into the injection well. The sliding sleeve (4) is driven to move on the outer circumferential surface of the base pipe string (2) by the sliding drive mechanism, so that the sliding sleeve (4) moves to the first predetermined position in the energy resource layer. The impact hammer (5) is driven by the hydraulic drive mechanism to impact the well wall of the energy resource rock at the first predetermined position in the energy resource layer to create fractures and increase permeability. S3. Drag the underground gasification pipe string backward so that the ignition device (3) is located in the first predetermined position in the energy resource layer, and drive the sliding sleeve (4) to move on the outer circumferential surface of the base pipe column (2) through the sliding drive mechanism, so that the sliding sleeve (4) moves to the second predetermined position in the energy resource layer. S4. Ignition is performed by the ignition device (3) to form a first gasification chamber at a first predetermined position in the energy resource layer for energy resource gasification; at the same time, the impact hammer (5) is driven by the hydraulic drive mechanism to impact the energy resource rock well wall at a second predetermined position in the energy resource layer to create fractures and increase permeability. S5. Drag the underground gasification pipe string backward so that the ignition device (3) is located in the second predetermined position in the energy resource layer, and drive the sliding sleeve (4) to move on the outer circumferential surface of the base pipe column (2) through the sliding drive mechanism so that the sliding sleeve (4) moves to the third predetermined position in the energy resource layer. S6. Ignition is performed by the ignition device (3) to form a second gasification chamber at a second predetermined position in the energy resource layer for energy resource gasification; at the same time, the impact hammer (5) is driven by the hydraulic drive mechanism to impact the energy resource rock well wall at a third predetermined position in the energy resource layer to create fractures and increase permeability. S7. Repeat steps S3 to S6 to sequentially perform fracture-making and permeability enhancement and energy resource gasification at all predetermined locations in the energy resource layer. The crude resource gas formed after energy resource gasification flows from the production well to the surface crude resource gas treatment device.

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