Downward drilling pulse water permeability enhancement gas continuous extraction device

Abstract

The application discloses a downward drilling pulse water permeability enhancement gas continuous extraction device and relates to the technical field of gas permeability enhancement extraction. The pulse water pressure generating system is arranged outside a drilling hole and comprises a water tank, a water injection pump, a high-pressure water storage tank, an electro-hydraulic proportional valve and an accumulator. The water outlet of the water tank is sequentially connected with the water injection pump, the high-pressure water storage tank and the electro-hydraulic proportional valve through a high-pressure pipeline, and the accumulator is connected in parallel to the high-pressure water supply pipeline. The water permeability enhancement extraction system is arranged inside the drilling hole and comprises a drill rod. The drill rod is a double-wall drill rod and is divided into an inner pipe and an outer pipe. A reverse discharge channel is arranged between the inner pipe and the outer pipe. A high-pressure water channel is arranged in the middle of the inner pipe. A drainage assembly, a nozzle assembly and a pulse assembly are sequentially arranged at the lower end of the inner pipe.

Description

Technical Field

[0001] This invention relates to the field of gas permeability enhancement and extraction technology, specifically a downward borehole pulse hydraulic permeability enhancement continuous gas extraction device. Background Technology

[0002] In recent years, hydraulic permeability enhancement technology has been widely used in the field of coal seam depressurization and permeability enhancement. Among them, pulsed hydraulic permeability enhancement technology uses periodically changing pulsed pressure to fracture the coal seam. The water hammer effect formed under the pulsating pressure of high-pressure water makes the coal body more easily damaged and can form a more complex fracture network.

[0003] However, existing pulsed hydraulic permeation devices have the following prominent problems in practical applications:

[0004] Firstly, in downward drilling, the water accumulation inside the borehole forms a water cushion resistance effect, which leads to a severe attenuation of the water jet impact force, low coal breaking efficiency, low coal cutting volume, and poor adaptability. Conventional pulse hydraulic permeation enhancement devices have not been structurally optimized for the special working conditions of downward drilling, and a large amount of pulse energy is lost during the transmission process.

[0005] Secondly, most existing pulse hydraulic permeation enhancement devices use the method of adjusting the surface fracturing pump to generate pulse pressure. The pulse pressure is severely lost in the wellbore and pipeline, and very little pulse energy actually acts on the coal seam.

[0006] To address the above problems, this invention provides a downward drilling pulse hydraulic permeability enhancement gas continuous extraction device to solve the aforementioned issues. Summary of the Invention

[0007] To achieve the above objectives, the present invention provides the following technical solution: a continuous gas extraction device for downward drilling pulse hydraulic permeability enhancement, comprising a pulse hydraulic pressure generation system and a hydraulic permeability enhancement extraction system, wherein the pulse hydraulic pressure generation system and the hydraulic permeability enhancement extraction system are connected by a high-pressure pipeline and both are controlled by a controller to start and stop operations;

[0008] The pulse water pressure generating system is located outside the borehole and includes a water tank, a water injection pump, a high-pressure water storage tank, an electro-hydraulic proportional valve, and an accumulator. The outlet of the water tank is connected to the water injection pump, the high-pressure water storage tank, and the electro-hydraulic proportional valve in sequence through a high-pressure pipeline. The accumulator is connected in parallel to the high-pressure water supply pipeline.

[0009] The hydraulic permeability enhancement extraction system is installed inside the borehole and includes a drill rod. The drill rod is a double-walled drill rod, divided into an inner tube and an outer tube. The inner tube and the outer tube are connected by a backflow channel. The middle of the inner tube is a high-pressure water channel. The lower end of the inner tube is sequentially equipped with a diversion assembly, a nozzle assembly, and a pulse assembly. The outer tube has multiple permeability enhancement holes and return holes at positions corresponding to the pulse assembly. The return holes are connected to the backflow channel.

[0010] Further, preferably, the drainage component includes:

[0011] The housing is sealed to the lower end face of the inner tube and is located inside the outer tube;

[0012] The flow guide ring is fixed inside the housing;

[0013] A conical ring is fixed inside the housing and located below the flow guide ring;

[0014] Multiple drainage holes are configured and are circumferentially formed on the outer wall of the housing.

[0015] Furthermore, preferably, the drainage hole is connected to the reverse drainage channel and corresponds to the position of the conical surface of the conical ring.

[0016] Further, preferably, the nozzle assembly includes:

[0017] The nozzle is sealed and connected to the lower end face of the drainage assembly;

[0018] The inlet section is located inside the nozzle at the upper position;

[0019] An oscillation chamber is located in the middle of the nozzle;

[0020] The outlet section is located inside the nozzle at the lower position.

[0021] Furthermore, preferably, the inlet section is a contracting cone shape that is larger at the top and smaller at the bottom, the lower inner wall of the oscillation chamber is provided with an inclined collision wall, and the outlet section is an expanding cone shape that is smaller at the top and larger at the bottom.

[0022] Further, preferably, the pulse component includes:

[0023] The cylinder body is sealed and connected to the lower end face of the nozzle assembly;

[0024] The end cap is slidably disposed inside the cylinder.

[0025] The return spring is fixed at one end to the lower end face of the end cap and at the other end to the bottom of the cylinder.

[0026] An expansion tube is fixed to the upper end face of the end cap.

[0027] Furthermore, preferably, a pulse chamber is provided between the cylinder and the expansion tube, and the side wall of the pulse chamber is provided with a plurality of injection holes, which are connected to the anti-permeability hole.

[0028] Compared with the prior art, the present invention provides a downward drilling pulse hydraulic permeability enhancement gas continuous extraction device, which has the following beneficial effects:

[0029] 1. Effectively overcomes the water cushion resistance-increasing effect in downward drilling: This invention uses a diversion component to introduce the annular water accumulated in the backflow channel between the outer and inner pipes into the conical ring. After being guided by the guide ring, the water flows into the nozzle assembly, transforming the water that originally hindered the jet into an auxiliary force to enhance the jet. This effectively overcomes the water cushion resistance-increasing effect and the bottom pressure effect in downward drilling, significantly improving the impact force of the jet and the coal breaking efficiency.

[0030] 2. The pulse energy is controllable and has low loss. This invention uses an electro-hydraulic proportional valve and an accumulator to form a pulse water pressure generation system. The pulse pressure is precisely modulated by the control signal. The accumulator compensates for the instantaneous flow when the valve is switched, ensuring that the pulse pressure is established quickly. Compared with the prior art, the pulse pressure acts directly on the pipeline system, with a fast response speed, effectively reducing the loss of pulse energy during transmission.

[0031] 3. Dual-stage pulse enhancement for high coal breaking efficiency: The nozzle assembly of this invention adopts a self-excited oscillation structure. The low-frequency pulse generated by the electro-hydraulic proportional valve is further converted into high-frequency pulse superposition in the oscillation chamber, realizing a dual-stage pulse generation mechanism of low-frequency modulation + high-frequency enhancement, which greatly improves the impact force of the jet.

[0032] 4. The expansion rubber tube and the injection hole work together to enhance permeability. After the high-frequency pulse jet enters the pulse chamber, it directly impacts the coal and rock on the hole wall through the injection hole and the permeability enhancement hole to form cutting grooves. On the other hand, it pushes the end cap to compress the reset spring, which drives the expansion rubber tube to apply a periodic alternating load to the water flow, generating pulses, causing fatigue damage to the coal body, and the cracks continuously expand and connect to form a dense crack network. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a schematic cross-sectional view of the drainage component of the present invention;

[0035] Figure 3 This is a cross-sectional view of the nozzle assembly of the present invention;

[0036] Figure 4 This is a cross-sectional view of the pulse component of the present invention;

[0037] In the diagram: 1. Water tank; 2. Water pump; 3. High-pressure water storage tank; 4. Overflow valve; 5. Electro-hydraulic proportional valve; 6. Accumulator; 7. Flow sensor; 8. Rotary joint; 10. Controller; 91. Drill rod; 92. Inner tube; 93. Outer tube; 94. Drainage assembly; 95. Nozzle assembly; 96. Pulse assembly; 97. Through-hole; 98. Return hole; 941. Shell; 942. Guide ring; 943. Conical ring; 944. Drainage hole; 951. Nozzle; 952. Inlet section; 953. Oscillating chamber; 954. Outlet section; 961. Cylinder; 962. End cap; 963. Return spring; 964. Expansion sleeve; 965. Pulse chamber; 966. Injection hole. Detailed Implementation

[0038] This invention provides a technical solution: a downward drilling pulse hydraulic permeability enhancement gas continuous extraction device, such as... Figure 1 As shown, the system comprises two main parts: a pulsed water pressure generation system and a hydraulic permeability enhancement extraction system. The pulsed water pressure generation system is located in the roadway outside the borehole and consists of a water tank 1, a water injection pump 2, a high-pressure water storage tank 3, an electro-hydraulic proportional valve 5, and an accumulator 6. The hydraulic permeability enhancement extraction system is located inside the borehole and is based on a drill rod 91. This drill rod 91 is a double-walled drill rod structure, consisting of an inner tube 92 and an outer tube 93. The middle of the inner tube 92 is a high-pressure water channel, and the space between the inner tube 92 and the outer tube 93 is a backflow channel. The lower end of the inner tube 92 is sequentially equipped with a diversion assembly 94, a nozzle assembly 95, and a pulse assembly 96. The outer tube 93 has multiple permeability enhancement holes 97 and return holes 98 at positions corresponding to the pulse assembly 96. The return holes 98 are connected to the backflow channel. The two systems are connected by a high-pressure pipeline and are both controlled by a controller 10 for unified start-up and shutdown.

[0039] First, the device is installed and lowered, and the pulse water pressure generation system is arranged. The water tank 1 is filled with clean water, and the high-pressure pipeline is connected in sequence to the water injection pump 2, the high-pressure water storage tank 3, and the electro-hydraulic proportional valve 5. The accumulator 6 is connected in parallel to the high-pressure water supply pipeline. At the same time, the hydraulic permeability enhancement extraction system is pre-assembled on the ground. Specifically, the diversion component 94, the nozzle component 95, and the pulse component 96 are sequentially sealed and fixed to the lower end of the inner tube 92. Then, the inner tube 92 is completely fitted into the outer tube 93 to form a double-wall drill pipe assembly. After assembly, the entire hydraulic permeability enhancement extraction system is lowered into the pre-constructed downward borehole by the drilling rig until the target coal seam is reached. Then, the upper end of the inner tube 92 is connected to the high-pressure water supply pipeline through the rotary joint 8, and the upper end of the outer tube 93 is connected to the reverse drainage suction equipment, waiting to start the permeability enhancement operation.

[0040] Secondly, the generation and modulation of pulsed water flow are performed. After the water injection pump 2 is started, the clean water in the water tank 1 is drawn into the water injection pump 2 through the high-pressure pipeline. After being pressurized to the set pressure in the pump, it is discharged and enters the high-pressure water storage tank 3. The high-pressure water storage tank 3 stabilizes the pressure and stores energy of the high-pressure water flow, absorbs the pressure pulsation generated by the water injection pump 2, and ensures that the pressure of the downstream water flow is stable. The overflow valve 4 set at its outlet end plays a safety protection role. When the system pressure exceeds the safety threshold, it automatically opens to release pressure. The high-pressure water flow after being stabilized by the high-pressure water storage tank 3 enters the electro-hydraulic proportional valve 5. The controller 10 outputs a periodically changing control signal to the electro-hydraulic proportional valve 5 to drive it. The electro-hydraulic proportional valve 5 switches rapidly between the pressure supply position and the pressure relief position at a set switching frequency, modulating the originally continuous high-pressure water flow into a high-pressure pulse water flow with a set pulse frequency and pulse amplitude. During this process, the accumulator 6 releases the pre-stored pressure energy the instantaneously when the electro-hydraulic proportional valve 5 switches from the pressure relief position to the pressure supply position to compensate for the instantaneous flow gap and ensure the stability of the pulse pressure. At the same time, it absorbs excess liquid kinetic energy the instantaneously when switching from the pressure supply position to the pressure relief position to avoid pressure shock in the pipeline. The flow sensor 7 monitors the water flow in the high-pressure water supply pipeline in real time and feeds it back to the controller 10 to achieve closed-loop precise control of the pulse parameters.

[0041] Afterwards, pulsed water flow is delivered and annular fluid is ejected. The high-pressure pulsed water flow, modulated by the electro-hydraulic proportional valve 5, travels along the high-pressure water supply pipeline, enters the high-pressure water channel in the middle of the inner pipe 92 through the rotary joint 8, and is delivered downwards along the inner pipe 92, finally reaching the inlet of the diversion component 94. At the same time, the water accumulated in the borehole, carrying the coal slag impacted, enters the reverse discharge channel between the inner pipe 92 and the outer pipe 93 through the return hole 98 on the outer pipe 93, and moves upwards along the reverse discharge channel. When the annular water rises along the reverse discharge channel to the location of the diversion component 94, its flow path undergoes a crucial change, specifically as follows: Figure 2As shown, the drainage assembly 94 includes a housing 941, a guide ring 942, a conical ring 943, and a drainage hole 944. The housing 941 is sealed to the lower end face of the inner tube 92 and located inside the outer tube 93. The guide ring 942 and the conical ring 943 are sequentially fixed inside the housing 941. The drainage hole 944 is opened on the outer wall of the housing 941 and communicates with the backflow channel. The water accumulated in the annulus enters the housing 941 under negative pressure after passing through the drainage hole 944 (because the high-pressure water flow rate inside the housing 941 is fast, its internal pressure is less than the pressure of the backflow channel, thus generating a negative pressure effect). The fluid then directly impacts the conical surface of the conical ring 943, which guides the radially flowing fluid to flow axially downwards. Subsequently, under the further guidance of the guide ring 942, the fluid accelerates downwards and finally mixes fully with the high-pressure main water flow from the inner tube 92 at the inlet section of the nozzle assembly 95. Through the orderly guidance of the diversion assembly 94, the borehole water that originally hindered the jet's function is transformed into auxiliary power for the high-pressure main water flow, increasing the jet's flow rate and momentum. This effectively overcomes the water cushion resistance effect and bottom pressure effect caused by water accumulation in the downward borehole.

[0042] Then, self-excited oscillation reinforcement is performed, such as... Figure 3 As shown, the nozzle assembly 95 includes a nozzle 951, which is sealed and connected to the lower end face of the flow guide assembly 94. The nozzle 951 has an inlet section 952, an oscillation chamber 953 and an outlet section 954 from top to bottom inside. The mixed high-pressure water flow first enters the inlet section 952, which is a constricting cone structure with a larger top and a smaller bottom. When the water flows through, the cross-sectional area gradually decreases and the flow velocity increases sharply. The pressure energy is converted into kinetic energy. The high-speed jet is ejected from the inlet section 952 and then enters the oscillation chamber 953.

[0043] It is important to note that the diameter of the oscillation chamber 953 is much larger than the minimum diameter of the inlet section 952. At this point, the jet suddenly expands, and minute pressure disturbances in the shear layer are selectively amplified, forming large-sized vortex structures. These vortices continue to move downstream, impacting the inclined collision wall formed on the lower inner wall of the oscillation chamber 953. The collision wall generates pressure disturbance waves upon impact, a portion of which propagates upstream to the jet separation zone of the inlet section 952, creating new disturbances at the jet boundary and forming a positive feedback loop for self-excited oscillation. When the frequency of the feedback wave is similar to that of the oscillation chamber 953... When the natural frequencies are consistent, resonance is generated, and the pressure fluctuations in the chamber are amplified sharply, forming a stable high-frequency pressure pulsation. As a result, the low-frequency pulse generated by the electro-hydraulic proportional valve 5 is converted into a high-frequency pulse superposition after self-excited oscillation in the oscillation chamber 953, realizing a dual-stage pulse generation mechanism of low-frequency modulation + high-frequency enhancement. The high-frequency pulse water flow enhanced by the oscillation chamber 953 is finally ejected through the outlet section 954. The outlet section 954 is an expanding conical structure with a smaller top and a larger bottom, which allows the pulse jet to further diffuse and accelerate at the outlet, acting on the subsequent pulse component 96 with an ideal flow rate and impact angle.

[0044] Then, pulse-induced fracturing and permeation enhancement operations are performed, such as... Figure 4 As shown, the pulse assembly 96 includes a cylinder 961, an end cap 962, a return spring 963, an expansion tube 964, and a pulse chamber 965. The cylinder 961 is sealed and connected to the lower end face of the nozzle assembly 95. The end cap 962 is sealed and slidably disposed inside the cylinder 961 and can slide up and down axially. One end of the return spring 963 is fixed to the lower end face of the end cap 962, and the other end is fixed to the bottom of the cylinder 961. The expansion tube 964 is fixed to the upper end face of the end cap 962. The pulse chamber 965 is disposed between the cylinder 961 and the expansion tube 964. The pulse chamber 965 is sealed and connected to the outlet section 954 of the nozzle assembly 95, and its side wall is provided with multiple injection holes 966. The injection holes 966 correspond to and are connected to the anti-permeability holes 97 on the outer tube 93.

[0045] In other words, after the high-frequency pulse jet emitted from the outlet section 954 enters the pulse chamber 965, a periodically pulsating pressure field is formed in the chamber, and the pulsating pressure field acts on the borehole wall simultaneously along two paths.

[0046] The first path is direct jet impact permeation enhancement. High-frequency pulsed water in the pulse chamber 965 is directly jetted onto the coal and rock surface of the borehole wall through the jet hole 966 and the permeation enhancement hole 97. Under the continuous impact of the high-frequency pulsed jet, the coal and rock surface is cut and eroded, forming the initial cutting groove and impact fracture zone, which increases the exposed area of ​​the coal and rock and destroys the integrity of the coal and rock.

[0047] The second path is pulse modulation anti-reflection. After the high-frequency pulsed water flow enters the pulse chamber 965, it creates a periodically pulsating pressure field within the chamber. This pulsating pressure acts directly on the upper surface of the end cap 962. During the pressure rise phase of the pulsed water flow, the end cap 962 is pushed downwards, compressing the return spring 963. The expansion cylinder 964, fixed to the upper surface of the end cap 962, moves downwards accordingly, increasing the volume of the pulse chamber 965. This further enhances and buffers the pressure fluctuations within the chamber. During the pressure fall phase of the pulsed water flow, the return spring 963 releases its elastic potential energy, pushing the end cap 962 upwards. The expansion cylinder 964 moves upwards accordingly, decreasing the volume of the pulse chamber 965, and causing the pressure within the chamber to change accordingly. Thus, the expansion sleeve 964 reciprocates inside the cylinder 961 with the pulse pressure, applying auxiliary pulsating excitation to the water flow in the pulse chamber 965. This causes the high-frequency pulse jet, which was originally enhanced by the nozzle assembly 95, to be modulated and amplified again before entering the injection hole 966. The high-pressure water flow, modulated by the expansion sleeve 964, is sprayed from the injection hole 966 on the side wall of the pulse chamber 965 and the permeability enhancement hole 97 on the outer pipe 93 onto the coal and rock surface of the borehole wall. This causes the ejected jet to carry high-frequency pressure fluctuations, applying a pulsed impact load to the coal wall. Combined with the cutting groove formed by the direct impact of the jet in the first path, the coal body suffers fatigue damage under the action of alternating impact loads, and the cracks continue to expand and penetrate.

[0048] The two paths described above do not act independently, but rather cooperate and synergize in time and space. In the first path, the high-frequency pulsed jet continuously ejected from the injection hole 966 forms initial cutting grooves and impact crushing zones on the coal wall surface, providing a favorable starting position and guiding surface for crack initiation. In the second path, the expansion sleeve 964 provides auxiliary pulsating excitation to the water flow in the pulse chamber 965, causing the jet ejected from the injection hole 966 to have an additional pressure fluctuation component superimposed on the original high frequency, further increasing the impact force and impact frequency. The two paths share the same... A set of injection holes 966 and permeability enhancement holes 97 serve as the final outlet. The pulse energy is modulated and enhanced twice before injection. The first modulation is completed in the oscillation chamber 953 of the nozzle assembly 95, and the second modulation is completed in the pulse chamber 965 with the assistance of the reciprocating motion of the expansion tube 964. The high-frequency pulse jet after the two modulations acts on the coal wall with a better impact frequency and a higher peak pressure. The cutting groove is continuously deepened and widened, and the fracture extends along the end of the groove into the depth of the coal body. Finally, a dense fracture network is formed around the borehole, radiating outward from the borehole.

[0049] During the continuous permeability enhancement operation, the high-frequency pulse jet impacts the coal wall, constantly generating coal slag and rock fragments. These solid fragments mix with the water accumulated in the borehole to form a water-slag mixture. The water-slag mixture enters the reverse discharge channel between the inner pipe 92 and the outer pipe 93 through the opening at the lower end of the outer pipe 93 and the return hole 98. It is continuously transported upward along the reverse discharge channel and finally discharged from the borehole opening to the roadway drainage ditch or coal-water separator, ensuring the cleanliness and unobstructed flow of the permeability enhancement operation area and avoiding the blockage of the jet hole 966 and permeability enhancement hole 97 caused by coal slag accumulation.

[0050] After the permeability enhancement operation is completed, there is no need to remove the hydraulic permeability enhancement extraction system from the borehole; gas extraction can be carried out directly. Driven by the pressure difference and concentration gradient, the gas in the coal seam is released from the micropores of the coal matrix, first entering the fracture network formed by the permeability enhancement, and then flowing into the borehole along the fracture network. It then enters the drill rod 91 through the permeability enhancement hole 97 on the outer pipe 93, and then returns to the borehole opening along the inner pipe 92. Finally, it enters the mine gas extraction pipeline network through the extraction branch pipe, realizing continuous gas extraction.

[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A downward borehole pulse hydraulic permeability enhancement gas continuous extraction device, characterized in that, It includes a pulse water pressure generating system and a hydraulic permeability enhancement extraction system. The pulse water pressure generating system and the hydraulic permeability enhancement extraction system are connected by a high-pressure pipeline and are both controlled by a controller (10) to start and stop operations. The pulse water pressure generating system is located outside the borehole and includes a water tank (1), a water injection pump (2), a high-pressure water storage tank (3), an electro-hydraulic proportional valve (5), and an accumulator (6). The outlet of the water tank (1) is connected to the water injection pump (2), the high-pressure water storage tank (3), and the electro-hydraulic proportional valve (5) in sequence through a high-pressure pipeline. The accumulator (6) is connected in parallel to the high-pressure water supply pipeline. The hydraulic permeability enhancement extraction system is installed inside the borehole and includes a drill rod (91). The drill rod (91) is a double-walled drill rod, which is divided into an inner tube (92) and an outer tube (93). The inner tube (92) and the outer tube (93) are connected by a backflow channel. The middle of the inner tube (92) is a high-pressure water channel. The lower end of the inner tube (92) is sequentially equipped with a diversion assembly (94), a nozzle assembly (95), and a pulse assembly (96). The outer tube (93) and the pulse assembly (96) are provided with multiple permeability enhancement holes (97) and return holes (98). The return holes (98) are connected to the backflow channel.

2. The downward drilling pulse hydraulic permeability enhancement gas continuous extraction device according to claim 1, characterized in that, The drainage component (94) includes: The housing (941) is sealed to the lower end face of the inner tube (92) and is located inside the outer tube (93); A flow guide ring (942) is fixed inside the housing (941); A conical ring (943) is fixed inside the housing (941) and located below the flow guide ring (942); Drainage holes (944) are configured in multiple circumferentially formed on the outer wall of the housing (941).

3. The downward drilling pulse hydraulic permeability enhancement gas continuous extraction device according to claim 2, characterized in that, The drainage hole (944) is connected to the reverse drainage channel and corresponds to the position of the conical surface of the conical ring (943).

4. The downward drilling pulse hydraulic permeability enhancement gas continuous extraction device according to claim 1, characterized in that, The nozzle assembly (95) includes: The nozzle (951) is sealed and connected to the lower end face of the drainage assembly (94); The inlet section (952) is located above the nozzle (951); An oscillation chamber (953) is located in the middle of the interior of the nozzle (951); The outlet section (954) is located below the nozzle (951).

5. A downward drilling pulse hydraulic permeability enhancement gas continuous extraction device according to claim 4, characterized in that, The inlet section (952) is a contracting cone that is larger at the top and smaller at the bottom, the lower inner wall of the oscillation chamber (953) is provided with an inclined collision wall, and the outlet section (954) is an expanding cone that is smaller at the top and larger at the bottom.

6. The downward drilling pulse hydraulic permeability enhancement gas continuous extraction device according to claim 1, characterized in that, The pulse component (96) includes: The cylinder (961) is sealed and connected to the lower end face of the nozzle assembly (95); End cap (962) is slidably disposed inside the cylinder (961); The return spring (963) has one end fixed to the lower end face of the end cap (962) and the other end fixed to the bottom of the cylinder (961); An expansion tube (964) is fixed to the upper end face of the end cap (962).

7. A downward drilling pulse hydraulic permeability enhancement gas continuous extraction device according to claim 6, characterized in that, A pulse chamber (965) is provided between the cylinder (961) and the expansion tube (964). The side wall of the pulse chamber (965) is provided with a plurality of injection holes (966), and the injection holes (966) are connected to the anti-permeability hole (97).

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