A shale gas reservoir integrated energy-gathering and blasting branch joint expansion device and an expansion method thereof

Abstract

The present application relates to shale gas mining equipment technical field, especially to a kind of shale gas reservoir integrated energy-gathering combustion branch joint expansion device and expansion method thereof.The technical scheme includes upper cover, shale reservoir and deep rock layer arranged in sequence, and the upper surface of the upper cover is provided with pump truck.The present application is pumped by pump truck, delivery pump, delivery pipeline, ground detection control system, signal line, shaft, horizontal well, integrated energy-gathering combustion branch joint expansion device and fracture network and other structure design, so that expansion device can be lifted, and with rotatable perforation to pump injection of liquid propellant.At the same time, various liquids required for pumping are controlled by corresponding valves, so that liquid propellant is pressed into the branch joint of shale reservoir fracture and then explodes.The detonation shock wave can further increase the pressure around the branch joint, form artificial fracture, and can determine the branch joint for operation in the fracture, not only simplify the process safety and environmental protection, especially suitable for low permeability shale gas reservoir exploitation.

Description

Technical Field

[0001] This invention relates to the field of shale gas extraction equipment technology, and in particular to an integrated energy-concentrating combustion and explosion fracture expansion device and its expansion method for shale gas reservoirs. Background Technology

[0002] Shale gas reservoirs typically have low porosity and permeability, which presents certain challenges to shale gas development technology. Currently, the commonly used method for shale gas extraction is hydraulic fracturing, but this method suffers from problems such as easy contamination of fracturing fluid, difficulty in flowback, high water consumption, and a simple fracture network.

[0003] In-situ combustion fracturing can effectively solve the above problems. However, although liquid explosives have certain advantages in terms of combustion time and operating cost when used in combustion fracturing, compared with solid explosives, liquid explosives are more complex to prepare, more cumbersome to transport, have higher safety requirements, and have a limited range of action. In addition, different liquids are usually pumped in sequence during liquid injection, which is time-consuming and less efficient.

[0004] To this end, an integrated energy-concentrating combustion and explosion support expansion device and its expansion method for shale gas reservoirs have been invented. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing an integrated energy-concentrating combustion and explosion support fracture expansion device and its expansion method for shale gas reservoirs.

[0006] On one hand, this application provides an integrated shaped charge combustion fracture expansion device for shale gas reservoirs, comprising an upper overburden layer, a shale reservoir, and a deep rock layer arranged sequentially. A pump truck is installed on the upper surface of the upper overburden layer, and the pump truck is pumped with solid particle explosive-carrying sand fluid, pre-displacement fluid, detonating fluid, and post-displacement fluid. The device also includes a delivery pump and delivery pipeline connected sequentially to the pump truck. A connected surface detection and control system and signal lines are also provided on the upper overburden layer. Vertical and horizontal wells are drilled in the upper overburden layer and the shale reservoir. The interior of the horizontal well is equipped with an integrated shaped charge combustion fracture expansion device and a fracture network that are interconnected.

[0007] Optionally, the delivery pipeline includes a solid particulate explosive carrying sand liquid pipeline, a front displacement liquid pipeline, an initiation liquid pipeline, and a rear displacement liquid pipeline.

[0008] Optionally, the integrated energy-concentrating explosive expansion joint device includes a fixed part, a solid particulate explosive carrying sand liquid telescopic pipeline, a front displacement liquid telescopic pipeline, an ignition liquid telescopic pipeline, a rear displacement liquid telescopic pipeline, a lifting sensor, a lifting rod, a fixed integrated control part, valves for the solid particulate explosive carrying sand liquid telescopic pipeline, valves for the front displacement liquid telescopic pipeline, valves for the ignition liquid telescopic pipeline, valves for the rear displacement liquid telescopic pipeline, a pumping pipeline, a rotating body, a motor, an acoustic detection device, a perforation hole, and a control sensor.

[0009] Optionally, the fixed part of the device is fixedly connected to the solid particulate explosive carrying liquid pipeline, the front displacement liquid pipeline, the detonating liquid pipeline, and the rear displacement liquid pipeline.

[0010] Optionally, the solid particulate explosive carrying sand-liquid telescopic pipeline, the front displacement fluid telescopic pipeline, the detonating fluid telescopic pipeline, and the rear displacement fluid telescopic pipeline are connected to the lifting rod and the fixed integrated control unit. These pipelines are connected to the pumping pipeline within the fixed integrated control unit via valves for the solid particulate explosive carrying sand-liquid pipeline, the front displacement fluid telescopic pipeline, the detonating fluid telescopic pipeline, and the rear displacement fluid telescopic pipeline. Furthermore, all valves for these pipelines are controlled by a control sensor.

[0011] Optionally, the control sensor is used to control the raising and lowering of the lifting sensor and the lifting rod.

[0012] Optionally, the pumping pipe is connected to the rotating body, and the rotating body is provided with a pair of shafts, which rotate coaxially after being driven by a motor.

[0013] Optionally, the acoustic detection device and the perforation are connected to the pumping pipeline, and the control sensor is used to receive signals from the ground detection and control system.

[0014] On the other hand, this application provides a method for expanding an integrated shaped charge combustion fracture expansion device for shale gas reservoirs, applied to the integrated shaped charge combustion fracture expansion device for shale gas reservoirs as described above, comprising the following steps:

[0015] S1. After selecting a sweet spot for shale gas, drill vertical wells from the surface into the shale reservoir, and then drill horizontal wells after completing the vertical wells.

[0016] S2. High-pressure liquid nitrogen is then pumped in to perform liquid nitrogen volumetric fracturing on the shale reservoir, generating a highly efficient fracture network.

[0017] S3. Next, the integrated energy-concentrating explosion-propelled joint expansion device is placed in a suitable area. The control sensor raises the lifting rod device into the joint. During the raising process, the acoustic detection device at the top detects the joint by the rotating body driven by the motor and feeds back to the ground detection and control system through the signal line.

[0018] S4. Further, through the analysis of the ground detection and control system, the control sensor receives feedback signals, the lifting sensor controls the lifting rod and the motor drives the rotating body to rotate so that the hole is aligned with the support gap.

[0019] S5. Then the pump truck pumps solid particulate explosive carrying sand liquid, front displacement liquid, detonating liquid and rear displacement liquid simultaneously through four delivery pipelines. The solid particulate explosive carrying sand liquid pipeline is connected to the solid particulate explosive carrying sand liquid telescopic pipeline in the device, the front displacement liquid pipeline is connected to the front displacement liquid telescopic pipeline in the device, the detonating liquid pipeline is connected to the detonating liquid telescopic pipeline in the device, and the rear displacement liquid pipeline is connected to the rear displacement liquid telescopic pipeline in the device.

[0020] S6. Then control the sensor to open the valve of the solid particulate explosive carrying sand liquid telescopic pipeline to pump the deflagration solid particulate explosive carrying sand liquid through the pumping pipeline. The solid particulate explosive is aluminum powder and gunpowder.

[0021] S7. Further, control the sensor to close the valve of the solid particle drug-carrying sand liquid expansion pipeline, open the valve of the pre-displacement liquid expansion pipeline, and pump the pre-displacement liquid through the pumping pipeline;

[0022] S8. Further, control the sensor to close the valve of the displacement fluid expansion line and open the valve of the detonating fluid expansion line. Pump the detonating fluid through the pumping pipeline. The detonating fluid is a NaOH solution, and the volume is determined according to the size of the crack and the concentration of sodium hydroxide in the solution.

[0023] S9. At this time, the control sensor closes the detonating fluid telescopic pipeline valve and opens the displacement fluid telescopic pipeline valve, and pumps the displacement fluid through the pumping pipeline. The displacement fluid is pumped to completely displace the detonating fluid into the crack and advance it to the trigger section. The pumping pressure Pb < 0.8σh, where σh is the crack opening pressure.

[0024] S10. Finally, repeat steps S3 to S9 to perform multi-angle support expansion work inside the crack.

[0025] In summary, this application includes at least one of the following beneficial technical effects of an integrated shaped charge combustion fracture widening device and its widening method for shale gas reservoirs:

[0026] This invention, through the design of a pump truck, delivery pump, delivery pipeline, surface detection and control system, signal line, vertical shaft, horizontal shaft, integrated shaped charge explosive fracture expansion device, and fracture network, enables the expansion device to be raised and lowered, and equipped with a rotatable perforation for pumping liquid explosives. Simultaneously, the various liquids required for pumping are controlled via corresponding valves, allowing the liquid explosives to be forced into the fractures of the shale reservoir and detonated. The deflagration shock wave further pressurizes the surrounding fractures, forming artificial fractures, and allows for the identification of fractures within the pores for operation. This simplified process is safer and more environmentally friendly, and is particularly suitable for the exploitation of low-permeability shale gas reservoirs. Attached Figure Description

[0027] Figure 1 A structural schematic diagram of the integrated energy-concentrating combustion and explosion joint expansion device and its expansion method for shale gas reservoirs according to the present invention is provided.

[0028] Figure 2 Detailed structural diagram of the integrated energy-concentrating explosion-prone joint expansion device;

[0029] Figure 3 This is a cross-sectional view of the transport pipeline;

[0030] Figure 4 Top view of the location of the retractable pipeline and lifting mast;

[0031] Figure 5 Top view of the fixed integrated control unit;

[0032] Figure 6 This is a top view of the solid of revolution;

[0033] Figure 7 This is a cross-sectional view of the perforation.

[0034] Attached reference numerals: 1. Pump truck; 2. Delivery pump; 3. Delivery pipeline; 3-1. Solid particulate explosive carrying sand-fluid pipeline; 3-2. Front displacement fluid pipeline; 3-3. Detonating fluid pipeline; 3-4. Rear displacement fluid pipeline; 4. Surface detection and control system; 5. Signal line; 6. Upper overburden layer; 7. Shale reservoir; 8. Deep strata; 9. Vertical shaft; 10. Horizontal shaft; 11. Integrated shaped charge combustion fracture expansion device; 11-1. Fixed part of the device; 11-2. Solid particulate explosive carrying sand-fluid telescopic pipeline; 11-3. Front displacement fluid telescopic pipeline; 11-4. Detonating fluid telescopic pipeline; 11 -5. Rear displacement fluid telescopic pipeline; 11-6. Lifting sensor; 11-7. Lifting rod; 11-8. Fixed integrated control unit; 11-9. Solid particle explosive carrying sand liquid telescopic pipeline valve; 11-10. Front displacement fluid telescopic pipeline valve; 11-11. Detonating fluid telescopic pipeline valve; 11-12. Rear displacement fluid telescopic pipeline valve; 11-13. Pumping pipeline; 11-14. Rotating body; 11-15. Shaft; 11-16. Motor; 11-17. Acoustic detection device; 11-18. Perforation; 11-19. Control sensor; 12. Fracture network. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0037] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example

[0042] like Figures 1 to 7As shown, this invention proposes an integrated shaped charge combustion fracture propulsion device for shale gas reservoirs, comprising an upper overburden layer 6, a shale reservoir 7, and a deep rock layer 8 arranged sequentially. A pump truck 1 is installed on the upper surface of the upper overburden layer 6. The pump truck 1 is pumped with solid particle explosive-carrying sand fluid, pre-displacement fluid, detonating fluid, and post-displacement fluid. The solid particle explosive-carrying sand fluid is a liquid mixture used in oil and gas extraction, mining exploration, and other industries. Its main function is to transport solid particles (such as sand, explosives, etc.) downhole or into fractures via liquid. Pre-displacement fluid is generally used in liquid injection or gas / liquid displacement operations. In oilfield or mining development, pre-displacement fluid serves as the initial injection fluid for displacement fluids, replacing downhole gas or liquids. It is typically injected first at the front end to lay the foundation for subsequent operations. Detonating fluid is used in blasting operations, especially in oil and gas drilling and mining. During downhole blasting or other extraction operations, detonating fluid is the liquid used to trigger an explosion, which can help effectively break rock layers or displace rocks. Post-displacement fluid is typically used as part of the displacement fluid during downhole operations, especially in liquid or gas displacement processes. Unlike pre-displacement fluid, post-displacement fluid is injected after pre-displacement fluid to further propel or replace the existing fluid in the well. It also includes: a delivery pump 2 and a delivery pipeline 3 connected in sequence to the pump truck 1. The delivery pipeline 3 includes a solid particle explosive-carrying sand fluid pipeline 3-1, a pre-displacement fluid pipeline 3-2, an initiation fluid pipeline 3-3, and a post-displacement fluid pipeline 3-4. A surface monitoring and control system 4 and a signal line 5 are also connected to the upper cover layer 6. Vertical wells 9 and horizontal wells 10 are connected within the upper cover layer 6 and the shale reservoir 7.

[0043] The acoustic detection device 11-17 is used for joint detection and adjustment based on feedback. With cloud-based analysis, the perforation holes 11-18 can be precisely rotated to align with the joint, ensuring the accuracy of the expansion operation. Detonating granules and solid granules are injected into the joint together, and then detonated using liquid detonating fluid. Simultaneous filling and detonation saves construction time and improves efficiency. Furthermore, the solid granule-carrying sand-liquid expansion valve 11-9, the front displacement fluid expansion valve 11-10, the detonating fluid expansion valve 11-11, and the rear displacement fluid expansion valve 11-12 sequentially pump in the isolation fluid, liquid explosive, and displacement fluid, simplifying the workflow. This automated pumping process reduces manpower and improves operational accuracy. The perforation holes 11-18 on the top of the integrated shaped charge explosive joint expansion device 11 can be raised, lowered, and rotated according to the joint location to maximize the expansion of surrounding joints. This increases the expansion range and improves construction effectiveness.

[0044] Furthermore, such as Figure 2 , Figure 4 , Figure 5 , Figure 6and Figure 7As shown, the interior of the horizontal well 10 is equipped with an integrated energy-conducting combustion fracture expansion device 11 and a fracture network 12 that are interconnected. The fracture network 12 refers to the interconnected and interwoven network structure formed by cracks or faults in rocks or underground geological bodies. These cracks or faults are physical fractures that occur when rocks are subjected to external forces, and the fracture network is a complex system composed of these cracks in different directions and connection methods. The integrated shaped charge explosion expansion device 11 includes a fixed part 11-1, a solid particulate explosive carrying sand liquid telescopic pipeline 11-2, a front displacement liquid telescopic pipeline 11-3, an ignition liquid telescopic pipeline 11-4, a rear displacement liquid telescopic pipeline 11-5, a lifting sensor 11-6, a lifting rod 11-7, a fixed integrated control part 11-8, a valve for the solid particulate explosive carrying sand liquid telescopic pipeline 11-9, a valve for the front displacement liquid telescopic pipeline 11-10, a valve for the ignition liquid telescopic pipeline 11-11, a valve for the rear displacement liquid telescopic pipeline 11-12, a pumping pipeline 11-13, a rotating body 11-14, a motor 11-16, an acoustic detection device 11-17, a perforation hole 11-18, and a control... The control sensor 11-19 is used to control the lifting and lowering of the lifting sensor 11-6 and the lifting rod 11-7. The fixed part 11-1 of the device is fixedly connected to the solid particulate explosive carrying liquid pipeline 3-1, the front displacement liquid pipeline 3-2, the detonating liquid pipeline 3-3, and the rear displacement liquid pipeline 3-4. The pumping pipe 11-13 is connected to the rotating body 11-14. The rotating body 11-14 is equipped with a pair of shafts 11-15, which rotate coaxially after being driven by the motor 11-16. The acoustic detection device 11-17 and the perforation hole 11-18 are connected to the pumping pipe 11-13. The control sensor 11-19 is used to receive signals from the ground detection and control system 4. The lifting sensor 11-6 is a sensor used to detect changes in the vertical position of an object, usually used to monitor the lifting and lowering motion of an object. It can sense changes in the height or position of an object in real time and convert this information into electrical signals or other types of signals for use by the control system. Lifting sensors are widely used in automation equipment, industrial machinery, robots, hydraulic systems, and other fields. Fixed integrated control components (11-8) typically refer to control units or components that are pre-integrated and fixedly installed in an automated system or equipment. This component is the core control part of the system, responsible for coordinating and managing the work of other components to ensure the normal operation of the entire system. Acoustic wave detection devices (11-17) are devices that use the principle of sound waves to detect objects or media. They analyze the characteristics, structure, or state of the target by emitting sound waves (or ultrasonic waves) and receiving the echo signals reflected back from the target object. Acoustic wave detection devices are widely used in various fields, including industrial inspection, medical imaging, and geological exploration. Control sensors (11-19) are devices used to detect and monitor system status, environmental conditions, or equipment operating parameters and transmit this information to the control system.Control sensors are typically key components in automation and control systems, enabling the sensing and feedback of various physical quantities such as temperature, pressure, flow rate, humidity, speed, and position. By sensing this information, the control system can make corresponding adjustments or decisions, thereby maintaining stable system operation or optimizing performance.

[0045] Furthermore, such as Figure 2 , Figure 4 and Figure 5 As shown, the solid particulate explosive carrying liquid telescopic line 11-2, the front displacement liquid telescopic line 11-3, the detonating liquid telescopic line 11-4, and the rear displacement liquid telescopic line 11-5 are connected to the lifting rod 11-7 and the fixed integrated control unit 11-8. The solid particulate explosive carrying liquid telescopic line 11-2, the front displacement liquid telescopic line 11-3, the detonating liquid telescopic line 11-4, and the rear displacement liquid telescopic line 11-5 pass through the solid particulate explosive in the fixed integrated control unit 11-8. The sand-carrying liquid telescopic pipeline valve 11-9, the front displacement liquid telescopic pipeline valve 11-10, the detonating liquid telescopic pipeline valve 11-11, and the rear displacement liquid telescopic pipeline valve 11-12 are connected to the pumping pipeline 11-13, and the solid particulate explosive sand-carrying liquid telescopic pipeline valve 11-9, the front displacement liquid telescopic pipeline valve 11-10, the detonating liquid telescopic pipeline valve 11-11, and the rear displacement liquid telescopic pipeline valve 11-12 are all controlled by the control sensor 11-19.

[0046] This application provides a method for expanding a shale gas reservoir using an integrated energy-concentrating combustion and explosion fracture expansion device, such as... Figure 1 - Figure 7 As shown, it includes the following steps:

[0047] S1. After selecting a sweet spot for shale gas, drill a vertical well 9 from the surface to the shale reservoir 7. After completing the vertical well, drill a horizontal well 10.

[0048] S2. High-pressure liquid nitrogen is then pumped in to perform liquid nitrogen volumetric fracturing on the shale reservoir, generating a highly efficient fracture network.

[0049] S3. Next, the integrated energy-concentrating and explosive expansion device 11 is placed in a suitable area. The control sensor 11-19 raises the lifting rod 11-7 into the gap. During the raising process, the top acoustic detection device 11-17 detects the gap with the motor 11-16 driving the rotating body 11-14, and feeds back to the ground detection and control system 4 through the signal line 5.

[0050] S4. Further, through the analysis of the ground detection and control system 4, the control sensor 11-19 receives the feedback signal, the lifting sensor 11-6 controls the lifting rod 11-7 and the motor 11-16 drives the rotating body 11-14 to rotate the hole 11-18 so that the hole is aligned with the support seam.

[0051] S5. Then, pump truck 1 pumps solid particulate explosive carrying sand liquid, front displacement liquid, detonating liquid and rear displacement liquid simultaneously through four delivery pipelines. Solid particulate explosive carrying sand liquid pipeline 3-1 is connected to solid particulate explosive carrying sand liquid telescopic pipeline 11-2 in the device. Front displacement liquid pipeline 3-2 is connected to front displacement liquid telescopic pipeline 11-3 in the device. Detonating liquid pipeline 3-3 is connected to detonating liquid telescopic pipeline 11-4 in the device. Rear displacement liquid pipeline 3-4 is connected to rear displacement liquid telescopic pipeline 11-5 in the device.

[0052] S6. Then, control sensor 11-19 to open valve 11-9 of the solid particulate explosive carrying liquid expansion pipeline to pump the deflagration solid particulate explosive carrying liquid through pumping pipe 11-13. The solid particulate explosive consists of aluminum powder and gunpowder. The main components of the gunpowder are oxidizer, plasticizer, combustion agent, binder, curing agent, crosslinking agent, and decelerating agent; the aluminum powder is coated with a paraffin wax coating.

[0053] S7. Further, control sensor 11-19 closes solid particle drug-carrying sand liquid expansion pipeline valve 11-9, opens pre-displacement liquid expansion pipeline valve 11-10, and pumps pre-displacement liquid through pumping pipeline 11-13.

[0054] S8. Further, control sensor 11-19 closes the front displacement liquid telescopic pipeline valve 11-10 and opens the detonating liquid telescopic pipeline valve 11-11, and pumps the detonating liquid through pumping pipeline 11-13. The detonating liquid is a NaOH solution, and the volume is determined according to the size of the crack and the concentration of sodium hydroxide in the solution.

[0055] S9. At this time, control sensor 11-19 closes the detonating fluid telescopic pipeline valve 11-11 and opens the displacement fluid telescopic pipeline valve 11-12. The displacement fluid is then pumped through pumping pipeline 11-13, completely displacing the detonating fluid into the fracture and advancing it to the triggering section. The pumping pressure Pb < 0.8σh, where σh is the fracture opening pressure.

[0056] S10. Finally, repeat steps S3 to S9 to perform multi-angle support expansion work inside the crack.

[0057] In this embodiment, after selecting a sweet spot for shale gas, a vertical well 9 is drilled from the surface into the shale reservoir 7, followed by a horizontal shaft 10. Then, a pump truck 1 injects high-pressure liquid nitrogen to perform liquid nitrogen volumetric fracturing on the shale reservoir, generating a highly efficient fracture network 12. Next, an integrated energy-concentrating combustion fracture expansion device 11 is placed in a suitable area. Control sensors 11-19 raise the lifting rod 11-7 into the fracture. During this raising process, the acoustic detection device 11-17 at the top, driven by a motor 11-16 and a rotating body 11-14, detects the fracture and sends feedback to the ground detection and control system 4 via signal line 5. Subsequently, through analysis by the ground detection and control system 4, the control sensor 11-19 receives the feedback signal, and the lifting sensor 11-6 controls the lifting rod 11-7, while the motor 11-16 drives the rotating body 11-14 to rotate the perforation 11-18 to align with the fracture. Subsequently, the control sensor 11-19 opens the valve 11-9 of the solid particulate explosive carrying liquid expansion pipeline, which pumps the deflagration solid particulate explosive carrying liquid through the pumping pipeline 11-13. The solid particulate explosive consists of aluminum powder and gunpowder. The main components of the gunpowder are oxidizer, plasticizer, combustion agent, binder, curing agent, crosslinking agent, and decelerating agent; the aluminum powder is coated with a paraffin wax coating. Then, control sensor 11-19 closes the solid particle explosive carrying sand liquid expansion pipeline valve 11-9 and opens the pre-displacement liquid expansion pipeline valve 11-10, pumping the pre-displacement liquid through pumping pipeline 11-13; further, control sensor 11-19 closes the pre-displacement liquid expansion pipeline valve 11-10 and opens the detonating liquid expansion pipeline valve 11-11, pumping the detonating liquid through pumping pipeline 11-13. The detonating liquid is a NaOH solution, and its volume is determined according to the size of the crack and the concentration of sodium hydroxide in the solution; further still, control sensor 11-19 closes the detonating liquid expansion pipeline valve 11-11 and opens the post-displacement liquid expansion pipeline valve 11-12, pumping the post-displacement liquid through pumping pipeline 11-13, pumping the post-displacement liquid to completely displace the detonating liquid into the crack and advance it to the triggering section, with a pumping pressure Pb < 0.8σh. Where σh is the tension pressure of the crack; finally, repeat steps S3 to S8 to carry out multi-angle support expansion operations inside the crack to generate a complex crack network.

[0058] The preferred embodiments of the present invention described above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A shale gas reservoir integrated shaped charge combustion fracture expansion device, comprising an upper overburden layer (6), a shale reservoir (7), and a deep rock layer (8) arranged sequentially, wherein a pump truck (1) is provided on the upper surface of the upper overburden layer (6), and the pump truck (1) is pumped with solid particulate explosive carrying liquid, pre-displacement liquid, ignition liquid, and post-displacement liquid, characterized in that, Also includes: The upper cover layer (6) is also equipped with a ground detection and control system (4) and a signal line (5) connected to the pump truck (1). A vertical shaft (9) and a horizontal shaft (10) are connected to the upper cover layer (6) and the shale reservoir (7). The horizontal shaft (10) is equipped with an integrated energy-concentrating combustion fracture expansion device (11) and a fracture network (12) connected to each other. The integrated energy-concentrating explosive expansion joint device (11) includes a fixed part (11-1), a solid particulate explosive carrying sand liquid telescopic pipeline (11-2), a front displacement liquid telescopic pipeline (11-3), an ignition liquid telescopic pipeline (11-4), a rear displacement liquid telescopic pipeline (11-5), a lifting sensor (11-6), a lifting rod (11-7), a fixed integrated control part (11-8), a valve for the solid particulate explosive carrying sand liquid telescopic pipeline (11-9), a valve for the front displacement liquid telescopic pipeline (11-10), a valve for the ignition liquid telescopic pipeline (11-11), a valve for the rear displacement liquid telescopic pipeline (11-12), a pumping pipeline (11-13), a rotating body (11-14), a motor (11-16), an acoustic detection device (11-17), a perforation hole (11-18), and a control sensor (11-19). The solid particulate explosive carrying liquid telescopic pipeline (11-2), the front displacement liquid telescopic pipeline (11-3), the detonating liquid telescopic pipeline (11-4), and the rear displacement liquid telescopic pipeline (11-5) are connected to the lifting rod (11-7) and the fixed integrated control unit (11-8). Furthermore, the solid particulate explosive carrying liquid telescopic pipeline (11-2), the front displacement liquid telescopic pipeline (11-3), the detonating liquid telescopic pipeline (11-4), and the rear displacement liquid telescopic pipeline (11-5) pass through the solid particulate explosive in the fixed integrated control unit (11-8). The telescopic valves (11-9), (11-10), (11-11), and (11-12) of the explosive-carrying sand liquid telescopic pipeline are connected to the pumping pipeline (11-13), and the telescopic valves (11-9), (11-10), (11-11), and (11-12) of the solid particle explosive-carrying sand liquid telescopic pipeline are all controlled by the control sensor (11-19). The control sensor (11-19) is used to control the lifting sensor (11-6) and the lifting rod (11-7). The control sensor (11-19) lifts the lifting rod (11-7) into the gap. During the lifting process, the acoustic detection device (11-17) at the top is driven by the motor (11-16) to rotate the body (11-14) to detect the gap and feeds back to the ground detection control system (4) through the signal line (5).

2. The shale gas reservoir integrated energy-concentrating combustion and explosion joint expansion device according to claim 1, characterized in that, The delivery pipeline (3) includes a solid particulate explosive carrying sand liquid pipeline (3-1), a front displacement liquid pipeline (3-2), an ignition liquid pipeline (3-3), and a rear displacement liquid pipeline (3-4).

3. The shale gas reservoir integrated energy-concentrating combustion and explosion joint expansion device according to claim 1, characterized in that, The fixed part (11-1) of the device is fixedly connected to the solid particulate explosive carrying sand liquid pipeline (3-1), the front displacement liquid pipeline (3-2), the detonating liquid pipeline (3-3), and the rear displacement liquid pipeline (3-4).

4. The shale gas reservoir integrated energy-concentrating combustion and explosion joint expansion device according to claim 1, characterized in that, The pumping pipe (11-13) is connected to the rotating body (11-14). The rotating body (11-14) is provided with a pair of shafts (11-15). The shafts (11-15) rotate coaxially after being driven by the motor (11-16).

5. The shale gas reservoir integrated energy-concentrating combustion and explosion joint expansion device according to claim 1, characterized in that, The acoustic detection device (11-17) and the perforation (11-18) are connected to the pumping pipe (11-13), and the control sensor (11-19) is used to receive signals from the ground detection and control system (4).

6. A method for expanding a shale gas reservoir integrated shaped charge combustion and explosion joint expansion device, applied to the shale gas reservoir integrated shaped charge combustion and explosion joint expansion device as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. After selecting a sweet spot for shale gas, drill a vertical well (9) from the surface to the shale reservoir (7). After completing the vertical well, drill a horizontal well (10). S2. High-pressure liquid nitrogen is then pumped in to perform liquid nitrogen volumetric fracturing on the shale reservoir, generating a highly efficient fracture network. S3. Next, the integrated energy-concentrating explosion-propelled joint expansion device (11) is placed in a suitable area. The control sensor (11-19) raises the lifting rod (11-7) into the joint. During the raising process, the acoustic detection device (11-17) at the top is driven by the motor (11-16) to rotate the body (11-14) to detect the joint and feeds back to the ground detection and control system (4) through the signal line (5). S4. Further, through the analysis of the ground detection control system (4), the control sensor (11-19) receives the feedback signal, the lifting sensor (11-6) controls the lifting rod (11-7) and the motor (11-16) drives the rotating body (11-14) to rotate the hole (11-18) so that the hole is aligned with the support seam. S5. Then the pump truck (1) pumps solid particulate explosive carrying sand liquid, front displacement liquid, detonating liquid and rear displacement liquid simultaneously through four delivery pipelines. The solid particulate explosive carrying sand liquid pipeline (3-1) is connected to the solid particulate explosive carrying sand liquid telescopic pipeline (11-2) in the device. The front displacement liquid pipeline (3-2) is connected to the front displacement liquid telescopic pipeline (11-3) in the device. The detonating liquid pipeline (3-3) is connected to the detonating liquid telescopic pipeline (11-4) in the device. The rear displacement liquid pipeline (3-4) is connected to the rear displacement liquid telescopic pipeline (11-5) in the device. S6. Then control the sensor (11-19) to open the valve (11-9) of the solid particulate explosive carrying sand liquid telescopic pipeline and pump the deflagration solid particulate explosive carrying sand liquid through the pumping pipeline (11-13). The solid particulate explosive is aluminum powder and gunpowder. S7. Further, control the sensor (11-19) to close the valve of the solid particle drug-carrying sand liquid expansion pipeline (11-9), open the valve of the pre-displacement liquid expansion pipeline (11-10), and pump the pre-displacement liquid through the pumping pipeline (11-13). S8. Further, control sensor (11-19) closes the front displacement liquid telescopic pipeline valve (11-10) and opens the detonating liquid telescopic pipeline valve (11-11). Detonating liquid is pumped through pumping pipeline (11-13). The detonating liquid is NaOH solution, and the volume is determined according to the size of the crack and the concentration of sodium hydroxide in the solution. S9. At this time, the control sensor (11-19) closes the detonating liquid telescopic pipeline valve (11-11) and opens the displacement liquid telescopic pipeline valve (11-12). The displacement liquid is pumped through the pumping pipeline (11-13) to completely displace the detonating liquid into the crack and advance it to the triggering section. The pumping pressure Pb < 0.8σh, where σh is the crack opening pressure. S10. Finally, repeat steps S3 to S9 to perform multi-angle support expansion work inside the crack.

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