A device for improving the drilling speed by coupling ultra-high pressure water jet and mechanical impact to break rock

Abstract

The present invention discloses a device for improving the drilling speed by coupling ultra-high pressure water jet and mechanical impact for rock breaking, which includes an ultra-high pressure jet intensifier, a hydraulic impactor and an ultra-high pressure drill bit that are coaxially and sequentially connected. The upper end of the ultra-high pressure jet intensifier is connected to the drill string. The axial vibration of the drill string is utilized to drive the plunger to move, thereby generating ultra-high pressure fluid. The ultra-high pressure fluid is ejected through the nozzle via the ultra-high pressure flow channel. Since the nozzle is arranged on the ultra-high pressure drill bit with an eccentricity less than the diameter of the drill bit, a circular groove is formed in the bottom-hole rock, cutting off the influence of the horizontal in-situ stress on the bottom-hole rock and reducing the rock strength. At the same time, when the conventional drilling fluid passes through the hydraulic impactor, the impact force of the drilling fluid acting on the ultra-high pressure drill bit is continuously changed, thereby causing impact damage to the rock. This device can form an ultra-high pressure water jet, generate a circular groove at the bottom hole, reduce the strength of the bottom-hole rock, and can form an impact to improve the rock-breaking efficiency.

Description

Technical Field

[0001] The present invention relates to the field of oil drilling engineering, and particularly to a drilling speed-up device for coupling ultra-high pressure water jet and mechanical impact to break rock. Background Technique

[0002] With the increase of well depth, the confining pressure on the rock increases linearly, resulting in an increase in rock plasticity. This is one of the main reasons for the low mechanical drilling speed and serious bit wear in deep and ultra-deep wells. At present, in terms of improving drilling speed, it is mainly achieved by developing new types of bits and developing auxiliary rock-breaking tools. Among them, the water jet-assisted rock-breaking method is widely used in the field of oil drilling due to its strong operability and high rock-breaking efficiency. At present, high-pressure water jets mainly assist in rock breaking by washing away rock debris with cleaning tools and expanding cracks to cause rock fragmentation. In terms of bit optimization, there are problems such as premature wear of the bit, short service life, and a mechanical drilling speed less than 1 m / h, which cannot meet the speed-up target for difficult-to-drill formations such as high-gravel rock and dolomite, and innovative rock-breaking methods are needed. In terms of tool matching, foreign technologies have a monopoly on vertical drilling tools (accounting for more than 80% of the workload), and the performance of domestic tools is unstable; the differences in the use effects of tools between wells are large, and the reliability of the vertical drilling system needs to be increased.

[0003] Therefore, the present invention proposes a drilling speed-up device for coupling ultra-high pressure water jet and mechanical impact to break rock. The high-pressure nozzles are arranged on the bit with a certain eccentricity (0 < e < bit size). During the rotary drilling process, the high-pressure nozzles will rotate around the axis of the bit, thereby realizing continuous damage to the rock, and then cutting out a circular groove at the bottom of the well, cutting off the action of in-situ stress on the bottom rock, reducing the strength of the rock, and making the rock exhibit brittle characteristics, greatly improving the drilling speed. Summary of the Invention

[0004] In order to solve the problem that the current high confining pressure on deep rocks leads to low drillability of the rocks, the present invention proposes a drilling speed-up device for coupling ultra-high pressure water jet and mechanical impact to break rock. In addition to having the function of general high-pressure water jet-assisted rock breaking, this device can also unload the effective stress of the bottom rock, improve the mechanical rock-breaking speed, and thus improve the drilling speed.

[0005] A device for accelerating drilling speed by coupling ultra-high pressure water jet and mechanical impact. The device for accelerating drilling speed includes an ultra-high pressure jet intensifier, a hydraulic impactor, and an ultra-high pressure bit that are coaxially and sequentially connected. The ultra-high pressure jet intensifier is provided with a normal drilling fluid flow channel and an ultra-high pressure flow channel. The top of the normal drilling fluid flow channel is connected to the drill string, the bottom is provided with a water inlet valve and is connected to one end of the booster cylinder assembly, the other end of the booster cylinder assembly is connected to the top of the ultra-high pressure flow channel, the top of the ultra-high pressure flow channel is provided with a water outlet valve, and the water inlet valve and the water outlet valve open and close asynchronously. The bottom of the ultra-high pressure flow channel is connected to the ultra-high pressure flow channel connecting device. The ultra-high pressure flow channel passes through the axis of the hydraulic impactor. A lateral outlet for drilling fluid is provided on the normal drilling fluid flow channel. The drilling fluid flows into the hydraulic impactor through the lateral outlet, drives the turbine and the valve disc in the hydraulic impactor to rotate, generates an impact force, and acts on the ultra-high pressure bit. The ultra-high pressure bit includes a normal bit flow channel, an ultra-high pressure bit flow channel, normal nozzles, and ultra-high pressure nozzles. The top of the ultra-high pressure bit flow channel is connected to the ultra-high pressure flow channel connecting device, and the bottom is connected to the ultra-high pressure nozzles. The ultra-high pressure nozzles are arranged on the blade with an eccentricity less than the bit size. The drilling fluid flowing out of the internal flow channel of the hydraulic impactor is ejected from the normal nozzles through the normal bit flow channel.

[0006] Further, the ultra-high pressure jet intensifier includes an upper adapter, a spline outer cylinder, a plunger shaft, an upper spring outer cylinder, a rigid retaining ring, an upper spring, an upper spring fixing device, a plunger, a seal assembly, a water inlet valve, a booster cylinder fixing steel sleeve, a booster cylinder assembly, a water outlet valve, an ultra-high pressure flow channel, and an ultra-high pressure flow channel connecting device. The upper end of the upper adapter is connected to the drill string, and the lower end is threadedly connected to the plunger shaft. The upper end of the plunger shaft is provided with splines to cooperate with the spline outer cylinder, and the lower end is threadedly connected to the plunger. The upper adapter drives the plunger shaft and the plunger to move up and down. The upper end of the upper spring outer cylinder is threadedly connected to the lower end of the spline outer cylinder, and the lower end is threadedly connected to the upper end of the booster cylinder outer cylinder. The rigid retaining ring is installed on the plunger shaft. The upper spring fixing device is fixed inside the upper spring outer cylinder. The upper spring is installed inside the upper spring outer cylinder through the upper spring fixing device and sleeved on the plunger shaft. The seal assembly is installed around the bottom end of the plunger. The bottom of the plunger is connected to the booster cylinder assembly. The water inlet valve is arranged at the center of the bottom end of the normal drilling fluid flow channel of the plunger. The booster cylinder assembly is installed inside the booster cylinder outer cylinder. The top end of the booster cylinder fixing steel sleeve abuts against the bottom step of the upper spring outer cylinder, and the bottom end abuts against the top periphery of the booster cylinder assembly. The bottom periphery of the booster cylinder assembly abuts against the top end of the turbine shaft fixing steel sleeve. The bottom end of the booster cylinder assembly is provided with a water outlet valve, and the water outlet valve is connected to the ultra-high pressure flow channel. The bottom end of the ultra-high pressure flow channel is connected to the ultra-high pressure flow channel connecting device.

[0007] Further, the drill string can drive the upper adapter sub, the plunger shaft, the rigid retaining ring, the upper spring fixing device and the plunger to move together. When the drill string moves upward, it will drive the upper adapter sub, the plunger shaft, the rigid retaining ring, the upper spring fixing device and the plunger to move upward together, generating negative pressure in the booster cylinder, and the drilling fluid is sucked into the booster cylinder assembly. When the drill string moves downward, it drives the piston downward, and the compressed drilling fluid enters the ultra-high pressure nozzle through the ultra-high pressure flow channel, forming an ultra-high pressure jet.

[0008] Further, the hydraulic impactor includes a turbine shaft fixing steel sleeve, a centralizer, a turbine, a turbine shaft, a valve disc, a valve seat, an impactor sleeve, a lower spring fixing device, a lower spring, a lower spring outer cylinder and a lower adapter sub. The turbine shaft fixing steel sleeve, the centralizer, the turbine and the valve disc are sequentially connected to the turbine shaft. An impactor sleeve is arranged between the bottom end of the centralizer and the top end of the valve seat. The bottom end of the valve seat abuts against the inner step surface at the bottom of the outer cylinder of the booster cylinder. The bottom of the outer cylinder of the booster cylinder is threadedly connected to the top of the lower spring outer cylinder. The lower spring is installed in the lower spring outer cylinder through the lower spring fixing device. The piston seat, the lower spring fixing device and the lower conversion structure are sequentially connected into one body.

[0009] Further, the turbine shaft fixing steel sleeve is connected to the top of the turbine shaft by thread. The turbine shaft fixing steel sleeve, the centralizer, the impactor sleeve and the valve seat are sequentially abutted inside the outer cylinder of the booster cylinder. The turbine and the valve disc are arranged inside the impact sleeve. The plunger is provided with a lateral outlet for the drilling fluid. The drilling fluid flows out through the lateral outlet and passes through the internal flow channels of the booster cylinder assembly, the turbine shaft fixing steel sleeve, the centralizer, the turbine, the valve disc, the valve seat, the piston seat and the lower adapter sub in sequence, generating an impact force acting on the ultra-high pressure drill bit.

[0010] Further, the ultra-high pressure flow channel passes through the centers of the turbine shaft fixing steel sleeve, the turbine shaft, the valve disc, the valve seat, the lower spring fixing device and the lower adapter sub and is connected to the ultra-high pressure flow channel connecting device.

[0011] Beneficial effects: In the present invention, the ultra-high pressure flow channel and the conventional flow channel are arranged inside the drill bit, and the high-pressure nozzle is arranged on the blade with an eccentricity less than the size of the drill bit. During the rotary drilling process, the high-pressure nozzle will rotate around the axis of the drill bit, thereby realizing the continuous destruction of the rock, and then cutting out a circular groove at the bottom of the well, cutting off the action of the in-situ stress on the bottom rock, reducing the strength of the rock, and the rock will exhibit brittle characteristics, assisting the conventional nozzle to clean the bottom of the well and preventing the holding-down effect; the impact force generated by the impact device acts on the drill bit through the lower adapter sub, thereby improving the rock-breaking efficiency of the drill bit and greatly increasing the drilling speed. Description of the Drawings

[0012] Figure 1 is a structural schematic diagram of the present invention;

[0013] Figure 2 is a schematic diagram of the turbine;

[0014] Figure 3 It is a schematic diagram of the valve disc;

[0015] Figure 4 It is a schematic diagram of the valve seat;

[0016] Figure 5 It is a sectional view taken along line A-A;

[0017] Figure 6 It is a sectional view taken along line B-B. Specific embodiments

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0019] A rock-breaking drilling speed-up device coupling ultra-high pressure water jet and mechanical impact provided by the present invention has a structure as Figure 1 shown, including an ultra-high pressure jet intensifier, a hydraulic impactor and an ultra-high pressure drill bit that are coaxially designed and connected in sequence.

[0020] As Figure 1 shown, the ultra-high pressure jet intensifier includes that the upper end of the upper adapter 1 is connected to the drill string, and the lower end is threadedly connected to the plunger shaft 3. The plunger shaft 3 is provided with splines to cooperate with the spline outer cylinder 2, which can be used to transmit torque and allow the plunger shaft to move up and down. A rigid retaining ring 5 is installed on the plunger shaft 3 to prevent the lower drill string from falling off. The upper end of the upper spring outer cylinder 4 is threadedly connected to the lower end of the spline outer cylinder 2. The upper spring 6 is installed inside the upper spring outer cylinder 4 through the upper spring fixing device 7, which is used to transmit the drilling pressure and modulate the irregular movement of the drill string axially into a regular movement. The upper end of the booster cylinder outer cylinder 9 is threadedly connected to the upper spring outer cylinder 4. The upper end of the plunger 8 is threadedly connected to the bottom end of the plunger shaft 3. A seal assembly 10 is installed around the bottom end of the plunger 8 to prevent the overflow of ultra-high pressure fluid. The inlet valve 11 is provided at the center of the bottom end of the plunger 8. The booster cylinder assembly 13 is installed inside the booster cylinder outer cylinder 9. The top end of the fixed steel sleeve 12 abuts against the bottom step of the upper spring outer cylinder 4. The top end of the periphery of the booster cylinder assembly 13 abuts against the bottom end of the booster cylinder fixed steel sleeve 12. The bottom end of the periphery of the booster cylinder assembly 13 abuts against the top end of the turbine shaft fixed steel sleeve 16. The top end of the ultra-high pressure flow channel 15 is provided with an outlet valve 14, and the bottom end of the ultra-high pressure flow channel 15 is connected to the ultra-high pressure flow channel connecting device 27. The ultra-high pressure flow channel connecting device is used to connect the ultra-high pressure flow channel inside the ultra-high pressure drill bit and the ultra-high pressure flow channel inside the drill string.

[0021] Due to the longitudinal vibration of the drill string, the drill string drives the upper adapter, the plunger shaft, the rigid retaining ring, the upper spring fixing device, and the plunger to move together. When the drill string moves upward, it drives the upper adapter, the plunger shaft, the rigid retaining ring, the upper spring fixing device, and the plunger to move upward together, generating negative pressure in the booster cylinder, and the drilling fluid is sucked into the booster cylinder. When the drill string moves downward, it drives the piston to move downward, and the compressed drilling fluid enters the nozzle of the drill bit through the ultra-high pressure flow channel, forming an ultra-high pressure jet for grooving the bottom hole rock.

[0022] As Figure 1 shown, the hydraulic impactor includes a turbine shaft fixing steel sleeve 16 connected to the turbine shaft 20 by threads. The bottom end of the turbine shaft fixing steel sleeve 16 abuts against the top end of the centralizer 17. The bottom end of the centralizer 17 abuts against the upper part of the top end of the impactor sleeve 18. The top end of the turbine 19 abuts against the lower part of the centralizer 17. The bottom end of the turbine shaft 20 is connected to the top end of the valve disc 21 by threads. The top end of the valve seat 22 abuts against the bottom end of the impactor sleeve 18. The bottom end of the valve seat 22 abuts against the step at the bottom end of the booster cylinder outer cylinder 9. The bottom end of the booster cylinder outer cylinder 9 is connected to the top end of the lower spring outer cylinder 25 by threads. The lower spring 24 is installed inside the lower spring outer cylinder 25 through the lower spring fixing device 23. The bottom end of the lower spring outer cylinder 25 is connected to the top end of the lower adapter 26 by threads. The bottom end of the ultra-high pressure flow channel 15 passes through the axes of the turbine shaft fixing steel sleeve 16, the turbine shaft 20, the valve disc 21, the valve seat 22, the lower spring fixing device 23, and the lower adapter 26 and is connected to the ultra-high pressure flow channel connecting device 27.

[0023] As Figure 1 shown, the ultra-high pressure drill bit includes a conventional flow channel 28 with its top end connected to the bottom end of the lower adapter 26 and its bottom end connected to a conventional nozzle 30. The top end of the drill bit ultra-high pressure flow channel 29 is connected to the ultra-high pressure flow channel connecting device 27, and the bottom end of the drill bit ultra-high pressure flow channel 29 is connected to an ultra-high pressure nozzle 31. The ultra-high pressure nozzle 31 is arranged on the blade with an eccentricity less than the size of the drill bit.

[0024] When the ultra-high pressure water jet and mechanical impact coupling rock-breaking and drilling speed-up device of the present invention is in use, the upper end of the upper adapter 1 is connected to the drill pipe. During operation, due to the longitudinal vibration of the drill string, the drill string drives the upper adapter 1, the plunger shaft 3, the rigid retaining ring 5, and the plunger 8 to move downward together. At this time, the inlet valve 11 is closed and the outlet valve 14 is opened. The drilling fluid inside the booster cylinder assembly 13 is pressurized. The pressurized ultra-high pressure fluid passes through the ultra-high pressure flow path 15 via the ultra-high pressure flow path connecting device 28, flows into the ultra-high pressure flow path 29 of the drill bit, and finally sprays out through the ultra-high pressure nozzle 31 to form an ultra-high pressure water jet for rock breaking. Since the ultra-high pressure nozzle 31 is arranged on the cutter blade with an eccentricity smaller than the size of the drill bit and the ultra-high pressure drill bit rotates at the bottom of the well, continuous damage to the bottom rock will be caused to form a circular groove, thereby cutting off the action of the horizontal in-situ stress on the bottom rock and reducing the strength of the rock. When the drill string drives the upper adapter 1, the plunger shaft 3, the rigid retaining ring 5, and the plunger 8 to move upward together, at this time, the inlet valve 11 is opened and the outlet valve 14 is closed. A negative pressure is formed in the cavity inside the booster cylinder assembly 13, and the drilling fluid is sucked into the booster cylinder through the central flow paths of the upper adapter 1, the plunger shaft 3, and the plunger 8, thus completing a pressurization cycle.

[0025] During the pressurization process of the fluid, since the central flow path of the plunger 8 is provided with a lateral outlet, the drilling fluid continuously flows out through the lateral outlet and sequentially passes through the internal flow path of the booster cylinder assembly 13, the internal flow path of the turbine shaft fixed steel sleeve 16, and the internal flow path of the centralizer 17 to drive the rotation of the turbine 19. Since the turbine 19 and the valve disc 21 are installed on the turbine shaft 20, the valve disc 21 is driven to rotate together. The internal parts of both the valve disc 21 and the valve seat 22 are provided with drilling fluid flow paths, and the drilling fluid can flow into the lower drill string through the flow paths of the valve disc 21 and the valve seat 22. Due to the rotation of the valve disc 21, the flow area of the flow paths of the valve disc 21 and the valve seat 22 changes. When the area becomes larger, the force acting on the lower spring fixing device 23 becomes larger, thereby driving the lower spring fixing device 23 and the lower adapter 27 to move downward together, and further making the impact force act on the ultra-high pressure drill bit; when the area becomes smaller, the force acting on the piston seat 23 becomes smaller, causing the lower spring to drive the lower spring fixing device 23 and the lower adapter 27 to move upward together. Thus, the impact force on the ultra-high pressure drill bit changes periodically, and further breaks the bottom rock.

[0026] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those skilled in the art within the essence of the present invention should also fall within the protection scope of the present invention.

Claims

1. A device for accelerating the drilling speed by coupling ultra-high pressure water jet and mechanical impact for rock breaking. The device for accelerating the drilling speed includes an ultra-high pressure jet intensifier, a hydraulic impactor, and an ultra-high pressure drill bit that are coaxially connected in sequence. Characterized in that, The ultra-high pressure jet intensifier includes a plunger shaft, a plunger, a booster cylinder assembly that are coaxially connected and located radially inside, and a spline outer cylinder, an upper spring outer cylinder, and a booster cylinder outer cylinder that are coaxially fixed and located radially outside. An upper spring is installed inside the upper spring outer cylinder and sleeved on the plunger shaft. The plunger shaft is axially mated with the spline outer cylinder. The booster cylinder assembly is fixed inside the booster cylinder outer cylinder. The bottom of the plunger is connected to the booster cylinder assembly. A common drilling fluid flow channel is formed in the middle of the plunger shaft and the plunger. The top of the common drilling fluid flow channel is connected to the drill string, and a water inlet valve is arranged at the bottom. The other end of the booster cylinder assembly is connected to the top of the ultra-high pressure flow channel. A water outlet valve is arranged at the top of the ultra-high pressure flow channel. The water inlet valve and the water outlet valve open and close asynchronously. The hydraulic impactor includes a turbine, a turbine shaft, a valve disc, a valve seat arranged inside the booster cylinder outer cylinder, and a lower spring outer cylinder coaxially arranged at the bottom of the booster cylinder outer cylinder. A lower spring is installed inside the lower spring outer cylinder. The ultra-high pressure flow channel passes through the axes of the turbine shaft, the valve disc, and the valve seat. The ultra-high pressure drill bit includes a conventional drill bit flow channel, an ultra-high pressure drill bit flow channel, a conventional nozzle, and an ultra-high pressure nozzle. The top of the ultra-high pressure drill bit flow channel is connected to the ultra-high pressure flow channel, and the bottom is connected to the ultra-high pressure nozzle. The ultra-high pressure nozzle is arranged on the blade with an eccentricity less than the size of the drill bit. The drilling fluid flowing out through the internal flow channel of the hydraulic impactor is ejected from the conventional nozzle through the conventional drill bit flow channel. When the plunger shaft and the plunger move upward, the drilling fluid is sucked into the booster cylinder assembly. When the plunger shaft and the plunger move downward, the compressed drilling fluid enters the ultra-high pressure nozzle through the ultra-high pressure flow channel to form an ultra-high pressure water jet. A lateral outlet for drilling fluid is arranged on the common drilling fluid flow channel. The drilling fluid flows into the hydraulic impactor through the lateral outlet, driving the turbine and the valve disc inside the hydraulic impactor to rotate and generate an impact force acting on the ultra-high pressure drill bit.

2. The device for accelerating the drilling speed by coupling ultra-high pressure water jet and mechanical impact for rock breaking according to claim 1, Characterized in that, The ultra-high pressure jet intensifier further includes an upper conversion joint, a rigid retaining ring, an upper spring fixing device, a sealing assembly, and a booster cylinder fixing steel sleeve. The upper end of the upper conversion joint is connected to the drill string, and the lower end is threadedly connected to the plunger shaft. The upper end of the plunger shaft is provided with splines that cooperate with the spline outer cylinder, and the lower end is threadedly connected to the plunger. The upper conversion joint drives the plunger shaft and the plunger to move up and down. The upper end of the upper spring outer cylinder is threadedly connected to the lower end of the spline outer cylinder, and the lower end is threadedly connected to the upper end of the booster cylinder outer cylinder. The rigid retaining ring is installed on the plunger shaft. The upper spring fixing device is fixed inside the upper spring outer cylinder. The upper spring is installed inside the upper spring outer cylinder through the upper spring fixing device and sleeved on the plunger shaft. The sealing assembly is installed around the bottom end of the plunger. The inlet valve is arranged at the center of the bottom end of the common drilling fluid flow path of the plunger. The booster cylinder assembly is installed inside the booster cylinder outer cylinder. The top end of the booster cylinder fixing steel sleeve abuts against the bottom step of the upper spring outer cylinder, and the bottom end abuts against the top end of the periphery of the booster cylinder assembly. The bottom end of the periphery of the booster cylinder assembly abuts against the top end of the turbine shaft fixing steel sleeve. The bottom end of the booster cylinder assembly is provided with an outlet valve, and the outlet valve is connected to the ultra-high pressure flow path. The bottom end of the ultra-high pressure flow path is connected to the ultra-high pressure flow path connecting device.

3. The ultra-high pressure water jet and mechanical impact coupling rock-breaking drilling speed-up device according to claim 2, characterized in that, the drill string can drive the upper conversion joint, the plunger shaft, the rigid retaining ring, the upper spring fixing device and the plunger to move together. When the drill string moves upward, it will drive the upper conversion joint, the plunger shaft, the rigid retaining ring, the upper spring fixing device and the plunger to move upward together, generating negative pressure in the booster cylinder, and the drilling fluid is sucked into the booster cylinder assembly. When the drill string moves downward, it drives the plunger to move downward, and the compressed drilling fluid enters the ultra-high pressure nozzle through the ultra-high pressure flow path to form an ultra-high pressure jet.

4. The ultra-high pressure water jet and mechanical impact coupling rock-breaking drilling speed-up device according to claim 1, characterized in that: The hydraulic impactor further includes a turbine shaft fixing steel sleeve, a centralizer, an impactor sleeve, a lower spring fixing device and a lower conversion joint. The turbine shaft fixing steel sleeve, the centralizer, the turbine and the valve disc are sequentially connected to the turbine shaft. An impactor sleeve is arranged between the bottom end of the centralizer and the top end of the valve seat. The bottom end of the valve seat abuts against the inner step surface at the bottom of the booster cylinder outer cylinder. The bottom of the booster cylinder outer cylinder is threadedly connected to the top of the lower spring outer cylinder. The lower spring is installed inside the lower spring outer cylinder through the lower spring fixing device. The piston seat, the lower spring fixing device and the lower conversion structure are sequentially connected into one body.

5. The ultra-high pressure water jet and mechanical impact coupling rock-breaking drilling speed-up device according to claim 4, characterized in that: The turbine shaft fixing steel sleeve is connected to the top of the turbine shaft by thread. The turbine shaft fixing steel sleeve, the centralizer, the impactor sleeve and the valve seat are sequentially abutted inside the booster cylinder outer cylinder. The turbine and the valve disc are arranged inside the impact sleeve; the plunger is provided with a lateral outlet for drilling fluid, and the drilling fluid flows out through the lateral outlet and passes through the internal flow paths of the booster cylinder assembly, the turbine shaft fixing steel sleeve, the centralizer, the turbine, the valve disc, the valve seat, the piston seat and the lower conversion joint in sequence to generate an impact force on the ultra-high pressure drill bit.

6. A device for accelerating drilling speed by coupling ultra-high pressure water jet and mechanical impact for rock breaking according to claim 5, characterized in that: The ultra-high pressure flow channel passes through the axles of the turbine shaft fixing steel sleeve, the turbine shaft, the valve disc, the valve seat, the lower spring fixing device and the lower adapter and is connected to the ultra-high pressure flow channel connecting device.

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