Integrated device and method for directional perforation and hydraulic fracturing for deep shale gas exploitation

Abstract

The application discloses an integrated device and method for directional perforation and hydraulic fracturing exploitation of deep shale gas, which comprises a laser heat stripping assembly, a dynamic hydraulic fracturing assembly and a rock debris collecting assembly. The application uses laser to instantaneously heat the surface of a shale reservoir to generate a perforation distribution with controllable distance and direction and to form complex thermal fractures in the reservoir around the perforation, which can reduce the fracturing difficulty of deep reservoirs, improve the shale gas resolution rate, induce the subsequent hydraulic fracturing cracks to directionally initiate in the fracturing area, and make the cracks form in the desired directional fracturing area, thus overcoming the technical problems existing in the prior art directional perforation. Meanwhile, the dynamic hydraulic fracturing based on the perforation method and the combined fracturing technology thereof can realize the complex and variable hydraulic fracturing advantage inclination design under the high-temperature and high-stress exploitation environment of deep shale, and further create more hydraulic fracturing effective areas not controlled by the ground stress.

Description

Technical Field

[0001] This invention belongs to the technical field of deep-earth oil and gas extraction, and in particular relates to an integrated device and method for directional perforation and hydraulic fracturing to extract deep shale gas. Background Technology

[0002] Unconventional oil and gas, especially shale gas, is a widely distributed and abundant oil and gas resource, and an important replacement resource for conventional oil and gas in my country. The main component of shale gas is CH4, which often exists in adsorbed and free states within shale formations. Due to the extremely low permeability of shale, generally less than 0.001 mD, shale gas reservoirs possess self-generating and self-storing characteristics. Conventional extraction methods struggle to generate industrial gas flow; therefore, over 90% of shale gas reservoirs require reservoir stimulation during extraction to create a complex fracture network, enabling the successful extraction of adsorbed and free shale gas from the fractures and pores.

[0003] Hydraulic perforation and hydraulic fracturing are two crucial stages in shale gas reservoir stimulation. Currently, most hydraulic perforations are based on conventional shaped charge perforations, typically using a uniform helical perforation pattern. This results in severe problems such as low well completion and insufficient perforation depth, making subsequent hydraulic fracturing of reservoir fractures unpredictable and leading to poor fracturing performance and difficulty in effectively improving production. For some time, directional perforation has been increasingly applied in practical engineering due to its shorter operation time, lower fluid consumption, and lower cost. However, existing directional perforation technologies can still lead to problems such as perforation blockage, small reservoir-wellbore communication area, and high gas flow resistance.

[0004] Furthermore, with increasing burial depth, the uniformity of reservoir distribution within the formation decreases, the complexity of the structure increases, and the temperature and pressure increase accordingly. This makes the high geostress, high horizontal stress difference, and anisotropy engineering characteristics of deep shale gas reservoirs (shale gas reservoirs with a burial depth between 3500 and 4500 m are defined as deep shale gas reservoirs) prominent, resulting in a very limited fracture network that can be formed by single static hydraulic fracturing in deep reservoirs. Because the dominant fracturing dip angle (i.e., the angle between the fracturing load direction and the bedding direction) is beneficial for utilizing bedding planes to connect more hydraulic fractures, it can improve the efficiency of a single fracturing operation. Dynamic fracturing technology can induce multi-directional radial fractures near the impact zone, free from the control of geostress. Therefore, people have successively proposed many dynamic hydraulic fracturing techniques and their combinations, such as hydraulic pulse fracturing and circulating hydraulic pulse fracturing, to improve the efficiency of deep shale gas extraction. However, scholars have found that when using static hydraulic fracturing and dynamic hydraulic fracturing to modify anisotropic shale reservoirs, especially deep shale gas reservoirs, the dominant fracturing dip angles are significantly different, making it impossible to improve the efficiency of deep shale gas extraction. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an integrated device and method for directional perforation and hydraulic fracturing to extract deep shale gas, which reduces fracturing difficulty, increases shale gas desorption rate, and can induce subsequent hydraulic fracturing fractures to directionally initiate in the fracturing area.

[0006] This invention provides an integrated device for directional perforation and hydraulic fracturing in the extraction of deep shale gas. Installed within a shale gas well, it includes a laser thermal stripping assembly, a dynamic hydraulic fracturing assembly, and a cuttings collection assembly. The shale gas well comprises a vertical wellbore and a horizontal wellbore connected to the vertical wellbore. Directional perforations are formed in the wall of the horizontal wellbore. The laser thermal stripping assembly includes a laser controller, a laser generator, and a laser head, all electrically connected in sequence. A guide tube is installed inside the horizontal wellbore, and several horizontally adjustable positioning boxes are mounted on the guide tube. Telescopic rods, corresponding to the directional perforations, are mounted on the positioning boxes. The laser head is positioned at the end of the telescopic rods. The laser generator transmits laser light to the laser head, which then thermally strips the shale reservoir outside the horizontal wellbore through the directional perforations. The cuttings collection assembly includes a cuttings suction pipe and a cuttings collection device, all connected in sequence. The well includes a fracturing fluid tank and a dust extraction motor. The fracturing pipe is inserted into the vertical wellbore, and a fracturing port is opened on the pipe facing the horizontal wellbore. The dynamic hydraulic fracturing assembly includes a fracturing fluid tank, a booster pump, a first control valve, a hydraulic fracturing pipe, and several directional hydraulic nozzles connected in sequence. The fracturing fluid tank and the booster pump are both located outside the shale gas well. The end of the hydraulic fracturing pipe passes through the vertical wellbore and is placed inside the horizontal wellbore. The directional hydraulic nozzles are connected to the end of the hydraulic fracturing pipe and are arranged corresponding to the directional perforations. The fracturing fluid in the fracturing fluid tank is sent into the horizontal wellbore through the booster pump, the hydraulic fracturing pipe, and the directional hydraulic nozzles, and static hydraulic fracturing of the shale reservoir is performed through the directional perforations. A pulse generator is installed outside the shale gas well. The pulse generator is connected to the hydraulic fracturing pipe through a second control valve. The pulse generator drives the fracturing fluid in the hydraulic fracturing pipe to perform dynamic hydraulic fracturing of the shale reservoir.

[0007] A first packer is installed inside the vertical shaft below the horizontal shaft, and a laser generator is placed on the first packer.

[0008] A second packer is provided at the end of the horizontal wellbore, and the guide tube is fixed to the center of the second packer.

[0009] A feed port for adding proppant is provided between the fracturing fluid tank and the booster pump.

[0010] The spacing between the positioning boxes is consistent with the spacing between the corresponding positioning holes.

[0011] The telescopic pole is remotely controlled from the ground to rotate 360 ​​degrees.

[0012] The inner diameter of the chip suction tube is 5-10 cm.

[0013] The pulse generator integrates a control module and can generate pulse loading rates ranging from 10. -3 -10 3 GPa / s.

[0014] The chip suction port is positioned directly opposite the horizontal wellbore and completely covers the area from the bottom of the horizontal wellbore to the bottom of the vertical wellbore.

[0015] An integrated method for directional perforation and hydraulic fracturing to extract deep shale gas includes the following steps:

[0016] S1. Select intact shale cores from the shale reservoir and cut them into cubic shale samples with a side length of 200 mm;

[0017] S2. Conduct laser irradiation-induced thermal exfoliation experiments on cubic shale samples, and record the laser emission power when the exfoliated surface of the cubic shale sample undergoes obvious melting, which can be used for downhole thermal exfoliation perforation.

[0018] S3. By comprehensively utilizing the data interpretation results of seismic, well logging, and reservoir numerical simulation, determine the changes in geostress in the reservoir area, determine the specific parameters of the directional fracturing area, and rationally design the number and orientation of directional perforations, hydraulic fracturing loading rate, and corresponding working modes.

[0019] S4. Vertical and horizontal wells are connected in the formation, with the overlying rock strata on the outside of the vertical well and the horizontal well placed in the shale reservoir. Directional perforations are set on the wall of the horizontal well.

[0020] S5. Complete the installation of the laser head, telescopic rod, positioning box and guide tube on the ground, complete the electrical connection between the laser controller, laser generator and laser head, put the guide tube into the horizontal well, put the laser generator in at the same time, fix the end of the guide tube to the center of the second packer, and fix the laser generator on the first packer.

[0021] S6. Complete the electrical connection of the dust collection pipe, rock cuttings collection box and dust collection motor on the surface, and put the dust collection pipe into the vertical shaft, so that its dust collection port is facing the horizontal shaft and completely covers the area from the horizontal shaft to the bottom of the vertical shaft.

[0022] S7. The ground-based remote-controlled telescopic pole is in the predetermined space state;

[0023] S8. Turn on the laser controller to control the laser generator to excite a fixed laser beam with a predetermined power, which is transmitted to the laser head through the optical fiber to irradiate the target shale reservoir. At the same time, turn on the dust suction motor to clean up the rock debris generated by the thermal exfoliation directional perforation through the dust suction pipe.

[0024] S9. After completing the thermal stripping, lift the chip suction pipe and adjust the working mode of the laser controller so that the laser generator continues to excite the laser beam with the emission power that does not produce thermal stripping. The laser head irradiates the already formed directional perforation, further increasing the shale gas desorption rate and forming complex thermal cracks around the perforation.

[0025] S10. After the dust collection pipe is raised to the ground surface, turn off the laser controller and raise the guide pipe;

[0026] S11. Quickly lower and install the hydraulic fracturing pipe equipped with the directional hydraulic nozzle. After the lowering is completed, the fracturing fluid mixed with the proppant is delivered to the hydraulic fracturing pipe by a booster pump.

[0027] S12. When the fluid pressure in the hydraulic fracturing pipe reaches the predetermined value, shut down the booster pump and the first control valve.

[0028] S13. Turn on the pulse generator and the second control valve to inject the hydraulic pulse generated by the pulse generator at a predetermined loading rate through the hydraulic fracturing pipe and the directional hydraulic nozzle along the direction of the directional perforation 11 to induce thermal crack propagation and impact fracturing to form hydraulic fractures.

[0029] S14. Evaluate the fracturing effect. Based on the actual situation, the working modes of the subsequent fracturing fluid tank, proppant, booster pump, first control valve, second control valve and pulse generator can be further adjusted to achieve the optimal fracturing combination scheme.

[0030] This invention utilizes laser to instantaneously heat the shale reservoir surface, generating a perforation distribution with controllable distance and orientation, and forming complex thermal fractures in the reservoir surrounding the perforations. This reduces the difficulty of fracturing deep reservoirs, increases the shale gas desorption rate, and induces subsequent hydraulic fracturing fractures to directionally initiate within the fracturing area, ensuring fracture formation within the desired directional fracturing region. This overcomes the technical challenges of existing directional perforation technologies, such as potential perforation blockage, small reservoir-wellbore connectivity, and high gas flow resistance. Furthermore, the dynamic hydraulic fracturing and combined fracturing technologies based on this perforation method can achieve complex and variable hydraulic fracturing dip angle design under the high-temperature and high-stress mining environment of deep shale, thereby creating more effective hydraulic fracturing areas unaffected by geostress.

[0031] This invention is relatively simple, technically mature and reliable. It solves the engineering problems of difficult directional extraction of deep shale gas and insufficient effective fracturing area. It reduces fracturing pressure, forms a complex initial crack network, improves the shale gas desorption rate, and can induce hydraulic fracturing fractures to directionally initiate in the target area. It can greatly increase the effective fracturing area under the dominant dip angle of hydraulic fracturing, which is conducive to achieving the goal of directional fracturing of complex deep reservoirs and improving recovery rate. Attached Figure Description

[0032] Figure 1This is a schematic diagram of the process flow for the integrated method of directional perforation and hydraulic fracturing for deep shale gas extraction in this invention.

[0033] The markings shown in the diagram and their corresponding component names are as follows:

[0034] 1. Vertical wellbore; 2. Horizontal wellbore; 3. Directional perforation; 4. Laser controller; 5. Laser generator; 6. Laser head; 7. Guide tube; 8. Positioning box; 9. Telescopic rod; 10. Shale reservoir; 11. Cuttings suction pipe; 12. Cuttings collection box; 13. Dust extraction motor; 14. Fracturing fluid tank; 15. Booster pump; 16. First control valve; 17. Hydraulic fracturing pipe; 18. Directional hydraulic nozzle; 19. Pulse generator; 20. Second control valve; 21. First packer; 22. Second packer; 23. Feed port; 24. Hydraulic fracture; 111. Cuttings suction port. Detailed Implementation

[0035] from Figure 1 As can be seen, this integrated device for directional perforation and hydraulic fracturing in the extraction of deep shale gas, installed inside a shale gas well, includes a laser thermal stripping assembly, a dynamic hydraulic fracturing assembly, and a cuttings collection assembly.

[0036] Shale gas wells include a vertical wellbore 1 and a horizontal wellbore 2. The vertical wellbore 1 is vertically arranged in the overlying strata, with its top flush with the surface and its bottom lower than the shale reservoir 10. The horizontal wellbore 2 is horizontally arranged in the shale reservoir 10 on one side of the vertical wellbore 1. The front end of the horizontal wellbore 2 is vertically connected to the vertical wellbore 1. Several directional perforations 3 are opened on the wall at the end of the horizontal wellbore 2. A first packer 21 is sealed and connected inside the vertical wellbore 1 below the horizontal wellbore 2, and a second packer 22 is sealed and connected at the end of the horizontal wellbore 2.

[0037] The laser thermal stripping assembly includes a laser controller 4, a laser generator 5, a laser head 6, a guide tube 7, a positioning box 8, and a telescopic rod 9. The laser controller 4 is placed on the ground surface on one side of the vertical wellbore 1. The laser generator 5 is placed on the first packer 21 inside the vertical wellbore 1. The signal receiving end of the laser generator 5 is electrically connected to the laser controller 4 via a cable. The laser output end of the laser generator 5 is electrically connected to the laser input end of the laser head 6 via an optical fiber. The guide tube 7 passes through the vertical wellbore 1 and is horizontally arranged inside the horizontal wellbore 2. The end of the guide tube 7 is fixed at the center of the second packer 22. The positioning box 8 is horizontally adjustable and installed on the guide tube 7 inside the horizontal wellbore 2. The telescopic rod 9 is installed on the positioning box 8 and is arranged corresponding to the directional perforation 3. The laser head 6 is placed at the end of the telescopic rod 9. The laser generator 5 transmits the laser to the laser head 6. The laser head 6 performs thermal stripping on the shale reservoir 10 outside the horizontal wellbore 2 through the directional perforation 3.

[0038] The cuttings collection assembly includes a cuttings suction pipe 11, a cuttings collection box 12, and a dust collection motor 13. The cuttings collection box 12 and the dust collection motor 13 are both placed on the ground surface on the other side of the vertical shaft 1. The cuttings suction pipe 11 is inserted into the vertical shaft 1. A cuttings suction port 111 is opened on the lower end of the cuttings suction pipe 11, which is arranged facing the horizontal shaft 2. The outlet of the cuttings suction pipe 11 is connected to the cuttings inlet of the cuttings collection box 12. The air outlet of the cuttings collection box 12 is connected to the air intake of the dust collection motor 13 through a pipe.

[0039] The dynamic hydraulic fracturing assembly includes a fracturing fluid tank 14, a booster pump 15, a first control valve 16, a hydraulic fracturing pipe 17, several directional hydraulic nozzles 18, a pulse generator 19, and a second control valve 20. The fracturing fluid tank 14 and the booster pump 15 are both located on the ground surface on one side of the vertical wellbore 1. The outlet of the fracturing fluid tank 14 is connected to the inlet of the booster pump 15 via a pipe. The outlet of the booster pump 15 is connected to the inlet of the first control valve 16 via a pipe. The outlet of the first control valve 16 is connected to the front end of the hydraulic fracturing pipe 17. The end of the hydraulic fracturing pipe 17 passes through the vertical wellbore 1 and is placed inside the horizontal wellbore 2. The directional hydraulic nozzles 18 are connected one-to-one with the directional injection nozzles. The hydraulic fracturing pipe 17 corresponding to the perforation 3 is positioned with the directional hydraulic nozzle 18 aligned with the directional perforation 3. The pulse generator 19 is placed on the ground surface on the other side of the vertical wellbore 1. The outlet of the pulse generator 19 is connected to the inlet of the second control valve 20 through a pipeline. The outlet of the second control valve 20 is connected to the front end of the hydraulic fracturing pipe 17. The fracturing fluid in the fracturing fluid tank 14 is sent into the horizontal wellbore 2 through the booster pump 15, the hydraulic fracturing pipe 17, and the directional hydraulic nozzle 18. Static hydraulic fracturing is performed on the shale reservoir 10 through the directional perforation 3. The pulse generator 19 drives the fracturing fluid in the hydraulic fracturing pipe 17 to perform dynamic hydraulic fracturing on the shale reservoir 10.

[0040] from Figure 1 It can be seen that a feed port 23 for adding proppant is provided on the pipeline between the fracturing fluid tank 14 and the booster pump 15.

[0041] In this invention, the spacing between the positioning boxes 8 is consistent with the spacing between the corresponding positioning holes 3, and the telescopic rod 9 is remotely controlled from the ground to rotate circumferentially.

[0042] In this invention, the inner diameter of the chip suction pipe 11 is 5-10cm, and the chip suction port 111 is a half-circular arc cut, which is arranged directly opposite the horizontal wellbore 2 and completely covers the area from the bottom of the horizontal wellbore 2 to the bottom of the vertical wellbore 1.

[0043] In this invention, the pulse generator 19 integrates a control module, and can generate pulse loading rates ranging from 10. -3 -10 3 GPa / s.

[0044] In this invention, the guide tube 7 integrates control into one unit.

[0045] The integrated method of directional perforation and hydraulic fracturing for deep shale gas extraction according to this invention includes the following steps:

[0046] S1. Select a complete shale core from shale reservoir 10 and cut it into cubic shale samples with a side length of 200mm.

[0047] S2. Conduct laser irradiation-induced thermal exfoliation experiments on cubic shale samples, and record the laser emission power when the exfoliated surface of the cubic shale sample undergoes obvious melting, which can be used for downhole thermal exfoliation perforation.

[0048] S3. By comprehensively utilizing the data interpretation results of seismic, well logging, and reservoir numerical simulation, determine the changes in geostress in the reservoir area, determine the specific parameters of the directional fracturing area, and rationally design the number and orientation of directional perforations 3, the hydraulic fracturing loading rate, and the corresponding working mode.

[0049] S4. A vertical wellbore 1 and a horizontal wellbore 2 are connected in the formation, with the overlying rock layer on the outside of the vertical wellbore 1 and the horizontal wellbore 2 placed in the shale reservoir 10. A directional perforation 3 is set on the wall of the horizontal wellbore 2.

[0050] S5. Complete the installation of laser head 6, telescopic rod 9, positioning box 8 and guide tube 7 on the ground surface, complete the electrical connection between laser controller 4, laser generator 5 and laser head 6, put guide tube 7 into horizontal well 2, put laser generator 5 in at the same time, fix the end of guide tube 7 to the center of second packer 22, and fix laser generator 5 on first packer 21.

[0051] S6. Complete the electrical connection of the surface-mounted chip suction pipe 11, rock chip collection box 12 and dust suction motor 13, and put the chip suction pipe 11 into the vertical shaft 1, so that its chip suction port 111 is positioned facing the horizontal shaft 2 and completely covers the area from the horizontal shaft 2 to the bottom of the vertical shaft 1.

[0052] S7. The ground remote control telescopic pole 9 is in the predetermined space state;

[0053] S8. Turn on the laser controller 4 to control the laser generator 5 to excite a fixed laser beam with a predetermined power, which is transmitted to the laser head 6 through the optical fiber to irradiate the target shale reservoir 10. At the same time, turn on the dust suction motor 13 to clean the rock debris generated by the thermal exfoliation directional perforation 3 through the chip suction pipe 11.

[0054] S9. After completing the thermal stripping, lift the chip suction pipe 11 and adjust the working mode of the laser controller 4 so that the laser generator 5 continues to excite the laser beam with the emission power that does not produce thermal stripping. The laser head 6 irradiates the already formed directional perforation 3, further increasing the shale gas desorption rate and forming complex thermal cracks around the perforation.

[0055] S10, after the dust suction pipe 11 is raised to the ground surface, turn off the laser controller 4 and raise the guide pipe 7;

[0056] S11. Quickly lower and install the hydraulic fracturing pipe 17 equipped with the directional hydraulic nozzle 18. After the lowering is completed, the fracturing fluid mixed with the proppant is delivered to the hydraulic fracturing pipe 17 by the booster pump 15.

[0057] S12. When the fluid pressure in the hydraulic fracturing pipe 17 reaches the predetermined value, shut down the booster pump 15 and the first control valve 16.

[0058] S13. Turn on the pulse generator 19 and the second control valve 20. The hydraulic pulse generated by the pulse generator 19 at a predetermined loading rate is injected from the hydraulic fracturing pipe 17 and the directional hydraulic nozzle 18 along the directional perforation 3 direction to induce thermal crack propagation and impact fracturing to form hydraulic fracture 24.

[0059] S14. Evaluate the fracturing effect. The working modes of the subsequent fracturing fluid tank 14, proppant, booster pump 15, first control valve 16, second control valve 20 and pulse generator 19 can be further adjusted according to the actual situation to achieve the optimal fracturing combination scheme.

[0060] In this invention, the emission power of the laser generator 5 should remain constant and the surface temperature of the reservoir rock should be lower than its melting point during the thermal exfoliation process, which is obtained based on the thermal exfoliation experiment of laser irradiation on the surface of the reservoir geological core.

[0061] In this invention, laser irradiation and cuttings removal work simultaneously during directional perforation to ensure timely removal of cuttings that have detached from the borehole and horizontal well.

[0062] In this invention, the cuttings collection box 12 cleans up the cuttings by creating a negative pressure environment inside the cuttings suction pipe 11. The cuttings collection box 12 sorts and organizes the cuttings collected under different working conditions to form a database to provide feedback and optimize the technical solutions for subsequent reservoir thermal stripping perforation or drilling.

[0063] In this invention, hydraulic fracturing is not limited to dynamic fracturing under a single fixed loading rate. The working mode can be adjusted according to the evaluation of reservoir fracturing effect, such as static fracturing followed by dynamic fracturing, dynamic fracturing followed by static fracturing, and cyclic dynamic and static fracturing.

[0064] Rock thermal exfoliation refers to the process by which rock, under instantaneous surface heating, experiences a limited expansion area due to its low thermal conductivity, causing the heated surface and the thin layer beneath it to peel off instantly under compressive stress and eject perpendicular to the rock surface. After one layer peels off, a fresh surface forms, and the same process occurs again, causing the exfoliation depression to extend continuously into the rock interior. Currently, it is believed that the rock fragments produced by rock exfoliation are approximately disk-shaped, with a maximum thickness of about 2-3 mm. This invention, based on the principle of rock thermal exfoliation, can solve the problem of uneven reservoir distribution by enabling directional fracturing of target areas. By utilizing directional perforations to create advantageous dip angles for hydraulic fracturing, and by employing dynamic fracturing and combined fracturing technologies to reduce the difficulty of complex crack formation under the influence of geostress by applying impact loads, it can significantly improve the recovery efficiency of deep shale gas resources.

[0065] This invention can better provide technical support for deep shale gas extraction in my country, ensure energy security, and has significant practical implications.

Claims

1. An integrated method for directional perforation and hydraulic fracturing to extract deep shale gas, characterized in that... This includes an integrated device for directional perforation and hydraulic fracturing to extract deep shale gas. The integrated device is installed inside a shale gas well and includes a laser thermal stripping assembly, a dynamic hydraulic fracturing assembly, and a cuttings collection assembly. The shale gas well includes a vertical wellbore (1) and a horizontal wellbore (2) connected to the vertical wellbore. Directional perforations (3) are opened on the wall of the horizontal wellbore. The laser thermal stripping assembly includes a laser controller (4), a laser generator (5), and a laser head (6) connected in sequence. A guide tube (7) is installed inside the horizontal wellbore. Several horizontally adjustable positioning boxes (8) are installed on the guide tube. Telescopic rods (9) corresponding to the directional perforations are installed on the positioning boxes. The laser head is placed at the end of the telescopic rod. The laser generator transmits the laser to the laser head. The laser head performs thermal stripping on the shale reservoir (10) outside the horizontal wellbore through the directional perforations. The cuttings collection assembly includes a cuttings suction pipe (11), a cuttings collection box (12), and a dust suction motor (13) connected in sequence. The cuttings suction pipe is inserted into the vertical wellbore, and a cuttings suction port (111) is opened on the cuttings suction pipe facing the horizontal wellbore. The dynamic hydraulic fracturing assembly includes a fracturing fluid tank (14), a booster pump (15), a first control valve (16), a hydraulic fracturing pipe (17), and several directional hydraulic nozzles (18) connected in sequence. The fracturing fluid tank and the booster pump are both located outside the shale gas well. The end of the hydraulic fracturing pipe passes through the vertical wellbore and is placed inside the horizontal wellbore. The directional hydraulic nozzles are connected to the end of the hydraulic fracturing pipe and are arranged corresponding to the directional perforations. The fracturing fluid in the fracturing fluid tank is sent into the horizontal wellbore through the booster pump, the hydraulic fracturing pipe, and the directional hydraulic nozzles, and static hydraulic fracturing of the shale reservoir is performed through the directional perforations. A pulse generator (19) is provided outside the shale gas well. The pulse generator is connected to the hydraulic fracturing pipe through the second control valve (20). The pulse generator drives the fracturing fluid in the hydraulic fracturing pipe to perform dynamic hydraulic fracturing of the shale reservoir. The integrated method includes the following steps: S1. Select a complete shale core from the shale reservoir (10) and cut it into a cubic shale sample with a side length of 200 mm. S2. Conduct laser irradiation-induced thermal exfoliation experiments on cubic shale samples, and record the laser emission power when the exfoliated surface of the cubic shale sample undergoes obvious melting, which can be used for downhole thermal exfoliation perforation. S3. By comprehensively utilizing the data interpretation results of seismic, well logging and reservoir numerical simulation, determine the changes in geostress in the reservoir area, determine the specific parameters of the directional fracturing area, and rationally design the number and orientation of directional perforations (3), hydraulic fracturing loading rate and corresponding working mode. S4. A vertical wellbore (1) and a horizontal wellbore (2) are connected in the formation, with the overlying rock layer on the outside of the vertical wellbore and the horizontal wellbore placed in the shale reservoir (10). Directional perforations are set on the wall of the horizontal wellbore. S5. Complete the installation of laser head (6), telescopic rod (9), positioning box (8) and guide tube (7) on the ground surface, complete the electrical connection between laser controller (4), laser generator (5) and laser head (6), put the guide tube into the horizontal well shaft, and put the laser generator (5) in at the same time. Fix the end of the guide tube to the center of the second packer (22), and fix the laser generator on the first packer (21). S6. Complete the electrical connection of the surface-mounted chip suction pipe (11), rock cuttings collection box (12) and dust suction motor (13), and place the chip suction pipe into the vertical shaft so that its chip suction port (111) is positioned facing the horizontal shaft and completely covers the area from the horizontal shaft to the bottom of the vertical shaft. S7. The ground-based remote-controlled telescopic pole is in the predetermined space state; S8. Turn on the laser controller to control the laser generator to excite a fixed laser beam with a predetermined power, which is transmitted to the laser head through the optical fiber to irradiate the target shale reservoir. At the same time, turn on the dust suction motor to clean up the rock debris generated by the thermal exfoliation directional perforation through the dust suction pipe. S9. After completing the thermal stripping, lift the chip suction pipe and adjust the working mode of the laser controller so that the laser generator continues to excite the laser beam with the emission power that does not produce thermal stripping. The laser head irradiates the already formed directional perforation, further increasing the shale gas desorption rate and forming complex thermal cracks around the perforation. S10. After the dust collection pipe is raised to the ground surface, turn off the laser controller and raise the guide pipe; S11. Quickly lower and install the hydraulic fracturing pipe (17) equipped with the directional hydraulic nozzle (18). After the lowering is completed, the fracturing fluid mixed with the proppant is delivered to the hydraulic fracturing pipe by the booster pump (15). S12. When the fluid pressure in the hydraulic fracturing pipe reaches the predetermined value, shut down the booster pump and the first control valve (16). S13. Turn on the pulse generator (19) and the second control valve (20) to inject the hydraulic pulse generated by the pulse generator at a predetermined loading rate through the hydraulic fracturing pipe and the directional hydraulic nozzle along the directional perforation direction to induce thermal crack propagation and impact fracturing to form hydraulic fractures (24). S14. Evaluate the fracturing effect. Based on the actual situation, the working modes of the subsequent fracturing fluid tank, proppant, booster pump, first control valve, second control valve and pulse generator can be further adjusted to achieve the optimal fracturing combination scheme.

2. The integrated method for directional perforation and hydraulic fracturing to extract deep shale gas according to claim 1, characterized in that: A first packer (21) is installed in the vertical shaft below the horizontal shaft, and a laser generator is placed on the first packer.

3. The integrated method for directional perforation and hydraulic fracturing to extract deep shale gas according to claim 1, characterized in that: A second packer (22) is provided at the end of the horizontal wellbore, and the guide tube is fixed at the center of the second packer.

4. The integrated method for directional perforation and hydraulic fracturing to extract deep shale gas according to claim 1, characterized in that: A feed port (23) for adding proppant is provided between the fracturing fluid tank and the booster pump.

5. The integrated method for directional perforation and hydraulic fracturing to extract deep shale gas according to claim 1, characterized in that: The spacing between the positioning boxes is consistent with the spacing between the corresponding positioning holes.

6. The integrated method for directional perforation and hydraulic fracturing to extract deep shale gas according to claim 1, characterized in that: The telescopic pole is remotely controlled from the ground to rotate 360 ​​degrees.

7. The integrated method for directional perforation and hydraulic fracturing to extract deep shale gas according to claim 1, characterized in that: The inner diameter of the chip suction tube is 5-10 cm.

8. The integrated method for directional perforation and hydraulic fracturing to extract deep shale gas according to claim 1, characterized in that: The pulse generator integrates a control module and can generate pulse loading rates ranging from 10. -3 -10 3 GPa / s.

9. The integrated method for directional perforation and hydraulic fracturing to extract deep shale gas according to claim 1, characterized in that: The chip suction port is positioned directly opposite the horizontal wellbore and completely covers the area from the bottom of the horizontal wellbore to the bottom of the vertical wellbore.

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