Downhole sliding drilling self-adapting hydraulic back pressure relief drill string apparatus

Abstract

This invention discloses a drill string device for adaptive hydraulic pressure relief in downhole sliding drilling, relating to the field of oil and gas drilling and extraction technology. It includes a pulse sub, one end of which is connected to a connecting sleeve, the other end of which is connected to a vibrating sub, the other end of which is connected to a rear connector, and the other end of the pulse sub is connected to a front connector. The vibrating sub contains a disc spring for driving the rear connector to reset, and a moving part for impacting and compressing the disc spring. Through components such as the screw rotor and turbine fan within the pulse sub, the hydraulic energy of the drilling fluid is efficiently converted into rotational mechanical energy (with minimal energy conversion loss). Simultaneously, by utilizing the periodic overlap and separation of the eccentric flow holes of the moving and stationary valve plates, combined with the reset action of the disc spring, high-frequency axial extension and retraction vibration of the rear connector is achieved. Furthermore, the drilling fluid can push the steel ball inside the front connector to bounce, forming radial reciprocating vibration, providing composite vibration power for drilling operations.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling and extraction technology, specifically to a drill string device for adaptive hydraulic pressure relief in downhole sliding drilling. Background Technology

[0002] In downhole drilling operations, the drill string, as the core load-bearing component that transmits drilling power and drilling pressure, directly determines the drilling efficiency, drill bit lifespan, and operational safety through its operational stability and energy transmission efficiency. Especially during sliding drilling in complex well conditions such as highly deviated wells and horizontal wells, the drill string needs to overcome the additional frictional resistance brought about by the wellbore trajectory, which places higher demands on its performance.

[0003] Existing drill string equipment still suffers from the following significant technical defects in sliding drilling operations under complex well conditions, making it difficult to meet the requirements for efficient and stable operation: First, existing drill strings generally adopt a simple mechanical pressure drive mode. Under this mode, the drill string and the well wall are prone to a "stick-slip effect" dominated by static friction. This not only leads to a sharp increase in frictional resistance and frequent pressure drag, but also causes inaccurate transmission of drilling pressure and an inability to stably apply effective drilling pressure to the drill bit. At the same time, it exacerbates the wear between the drill string and the well wall, reducing the reliability and service life of the equipment. Second, existing drill string equipment with vibration-assisted functions either require an additional power drive module to achieve vibration, which increases the complexity of the equipment structure and increases manufacturing and maintenance costs, or, although relying on the hydraulic drive of drilling fluid, suffers from low efficiency in converting hydraulic energy to mechanical energy and unstable vibration frequency and amplitude, making it impossible to form a continuous and effective composite pressure effect. It is difficult to break the "stick-slip effect" through vibration assistance, and thus cannot effectively improve the rock-breaking efficiency of the drill bit.

[0004] Given the shortcomings of the existing technologies, there is an urgent need to develop a drill string device that requires no additional power source, can adaptively utilize drilling fluid to achieve stable vibration, and can effectively alleviate pressure problems and improve energy utilization efficiency, so as to adapt to the operational needs of complex downhole sliding drilling scenarios such as highly deviated wells and horizontal wells, and fill the gaps in existing technologies. Summary of the Invention

[0005] To address the above problems, this invention provides a drill string device for adaptive hydraulic pressure relief in downhole sliding drilling.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drill string device for adaptive hydraulic pressure relief in downhole sliding drilling, comprising a pulse sub, one end of which is connected to a connecting sleeve, the other end of which is connected to a vibrating sub, the other end of which is connected to a rear connector, and the other end of which is connected to a front connector. The vibrating section is internally provided with a disc spring for driving the rear connector to reset, and the vibrating section is internally provided with a movable part for impacting and compressing the disc spring. The pulse stub is internally equipped with a screw rotor for generating rotational force, and the pulse stub is internally equipped with a screw motor liner. The lower end of the screw rotor is connected to a valve core, and the upper end of the screw rotor is equipped with multiple sets of turbine fans for generating rotational force.

[0007] Preferably, a sealing sleeve is slidably connected to the outer side of the rear connector, and a sealing ring is provided on the outer side of the rear connector to seal the gap between the rear connector and the sealing sleeve. A movable cavity is provided between the rear connector and the sealing sleeve to allow for the reciprocating movement of the rear connector. The lower end of the sealing sleeve is fixedly connected to the vibration short section, and the connection between the sealing sleeve and the vibration short section is sealed.

[0008] Preferably, the rear connector is provided with a first compression ring and a second compression ring, and a sealing ring is provided on the first compression ring and the second compression ring respectively. The first compression ring and the second compression ring are slidably connected to the vibration short section. The rear connector is provided with a shoulder corresponding to the first compression ring and the second compression ring. The disc spring is located between the second compression ring and the second compression ring, and between the second compression ring and the sealing sleeve.

[0009] Preferably, the movable component is located at the lower end of the rear connector, and a funnel-shaped through hole is provided on the inner side of the movable component. An impact bushing is fixedly connected to one end of the movable component near the rear connector. The upper diameter of the funnel-shaped through hole is larger than the diameter of the through hole inside the rear connector, and the lower diameter of the funnel-shaped through hole is smaller than the diameter of the through hole inside the lower end of the pulse stub.

[0010] Preferably, a sealed bearing is connected to the upper end of the screw rotor, the sealed bearing is connected inside the pulse stub, a connecting shaft is fixedly connected to the upper end of the screw rotor, multiple sets of turbine fans are connected to the connecting shaft, a conical guide cap is fixedly connected to the upper end of the connecting shaft, guide vanes are provided between the multiple sets of turbine fans, and the guide vanes are fixed to the pulse stub.

[0011] Preferably, the lower end of the screw rotor is connected to a connecting member, the lower end of the connecting member is fixedly connected to a moving valve plate, a cavity is provided between the moving valve plate and the connecting member, the connecting member is provided with a plurality of communicating holes communicating with the cavity along its circumference, a stationary valve plate is provided at the lower end of the moving valve plate, and a sealing bushing is provided on the outer side of the stationary valve plate.

[0012] Preferably, the moving valve plate has a first flow passage hole inside, the first flow passage hole is eccentrically arranged, the stationary valve plate has a second flow passage hole, the second flow passage hole is eccentrically arranged, and the diameter of the first flow passage hole is smaller than the diameter of the second flow passage hole.

[0013] Preferably, the front connector has a ball seat inside, and the ball seat has a placement groove in which a steel ball is placed.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through components such as the screw rotor and turbine fan inside the pulse sub, the hydraulic energy of the drilling fluid is efficiently converted into rotational mechanical energy (with low energy conversion loss); at the same time, with the periodic overlap and separation of the eccentric flow holes of the moving and stationary valve plates, and the reset action of the disc spring, high-frequency axial extension and contraction vibration of the rear joint is achieved. It can also drive the steel ball in the front joint to jump through the drilling fluid, forming radial reciprocating vibration, providing composite vibration power for drilling operations.

[0015] 2. On the one hand, the sealing of each connection part is achieved through components such as the plugging sleeve and sealing ring. The plugging sleeve also provides guidance for the reciprocating motion of the rear connector. With the precise control of the valve core and the shoulder, component jamming, displacement and drilling fluid leakage are avoided, ensuring the long-term stable operation of the equipment. On the other hand, no additional power source is required. It relies on hydraulic drive to achieve adaptive vibration adjustment, which can adapt to complex drilling operation scenarios such as high-angle wells and horizontal wells.

[0016] 3. High-frequency axial vibration can break the "stick-slip effect" between the drill string and the well wall, converting static friction into dynamic friction to reduce frictional resistance; the combination of radial reciprocating vibration and axial vibration forms a "mechanical + hydraulic" composite pressurization form, providing more precise and effective drilling pressure for the drill bit. The dual effect not only effectively alleviates the pressure problem, but also directly improves the rock breaking efficiency of the drill bit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional view of the present invention. Figure 1 ; Figure 3 This is a partial cross-sectional view of the present invention. Figure 2 ; Figure 4 This is a partial cross-sectional view of the present invention. Figure 3 ; Figure 5 This is a schematic diagram of the valve plate of the present invention; Figure 6 This is a schematic diagram of the movable part of the present invention.

[0018] The diagram is labeled as follows: 1. Pulse sub; 2. Connecting sleeve; 3. Vibration sub; 4. Rear connector; 5. Front connector; 11. Screw rotor; 12. Screw motor liner; 13. Sealed bearing; 14. Connecting shaft; 15. Turbine fan; 16. Guide vane; 17. Guide cap; 18. Moving valve plate; 19. Stationary valve plate; 31. Moving part; 32. Impact liner; 33. Funnel-shaped through hole; 34. First compression ring; 35. Second compression ring; 36. Disc spring; 41. Sealing sleeve; 42. Moving cavity; 43. Sealing ring; 44. Shoulder; 51. Ball seat; 52. Steel ball; 53. Placement groove; 111. Connector; 112. Connecting hole; 113. Sealing bushing; 181. First flow hole; 191. Second flow hole. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0020] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A drill string device for adaptive hydraulic pressure relief in downhole sliding drilling includes a pulse sub 1. The pulse sub 1, as the core power transmission and fluid flow guiding component, provides a stable fluid flow channel for the subsequent vibration mechanism, solving the problem of uneven fluid distribution in traditional drill strings. One end of the pulse sub 1 is connected to a connecting sleeve 2, which is made of high-strength wear-resistant material. This ensures a stable connection between the pulse sub 1 and the vibration sub 3, while also providing a certain buffering effect, solving the problem of excessive gaps and loosening between different components. The other end of the connecting sleeve 2 is connected to a vibration sub 3, which is axially... The vibration mechanism provides an installation cavity with a sealed design that prevents drilling fluid from seeping into the interior and affecting component operation, thus solving the problem of vibration mechanisms being susceptible to drilling fluid corrosion and frequent failures. The other end of the vibration sub 3 is connected to a rear connector 4, which is used to connect to the downhole pipeline. Its outer sliding structure provides a basis for reciprocating extension and retraction, solving the problem that traditional connectors can only provide a fixed connection and cannot achieve vibration compensation. The other end of the pulse sub 1 is connected to a front connector 5, which is used to connect the drill bit and integrates a radial vibration mechanism inside, solving the problem that the drill bit can only receive axial pressure and has low rock breaking efficiency.

[0021] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6The vibrating section 3 is internally equipped with a disc spring 36 for driving the rear connector 4 to reset. The disc spring 36 has the advantages of stable elastic coefficient and rapid reset response. It can quickly drive the relevant components to reset when the reverse force of the drilling fluid weakens, which solves the problem of slow response and inability to achieve high-frequency vibration in traditional reset mechanisms. The vibrating section 3 is internally equipped with a movable part 31 for impacting and compressing the disc spring 36. The movable part 31 adopts a streamlined structure, which can efficiently bear the reverse impact force of the drilling fluid and convert the hydraulic pressure into mechanical impact force, which solves the problem of low hydraulic pressure utilization and difficulty in driving the reset mechanism. The pulse sub 1 is internally equipped with a screw rotor 11 for generating rotational force. The screw rotor 11 and the screw motor liner 12 have a high precision fit, which can efficiently convert the hydraulic energy of the drilling fluid into rotational mechanical energy, solving the problem of low energy conversion rate of traditional rotating power components. The screw motor liner 12 is internally equipped with a wear-resistant coating on its inner wall, which can reduce the wear of the screw rotor 11 during rotation, extend the service life of the components, and solve the problems of easy wear and high maintenance costs of rotating mechanisms during long-term operation. The lower end of the screw rotor 11 is connected to a valve core, which can cooperate with the subsequent valve plate structure to achieve precise control of the flow rate, solving the problems of inaccurate flow rate adjustment and unstable vibration frequency. The upper end of the screw rotor 11 is equipped with multiple sets of turbine fans 15 for generating rotational force. The multiple sets of turbine fans 15 are evenly distributed in a circle, which can enhance the driving force of drilling fluid impact and improve the rotational stability of the screw rotor 11, solving the problems of insufficient power of a single turbine drive and easy rotational eccentricity.

[0022] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A sealing sleeve 41 is slidably connected to the outer side of the rear connector 4. The sealing sleeve 41 guides the reciprocating motion of the rear connector 4, preventing deviation during movement and solving the problem of jamming and deviation when the rear connector 4 extends or retracts. A sealing ring 43 is provided on the outer side of the rear connector 4 to seal the gap between the rear connector 4 and the sealing sleeve 41. The sealing ring 43 is made of a high-pressure resistant and drilling fluid corrosion resistant material, which can effectively prevent drilling fluid from seeping into the gap and affecting the sliding effect, solving the problem of leakage at the sliding connection and reduced hydraulic efficiency. A movable cavity 42 is provided between the rear connector 4 and the sealing sleeve 41. The movable cavity 42 provides a margin for the reciprocating motion of the rear connector 4. Its reasonable cavity volume design can ensure the extension and retraction stroke of the rear connector 4, solving the problems of insufficient reciprocating motion stroke and small vibration amplitude. The lower end of the sealing sleeve 41 is fixedly connected to the vibration short section 3. The connection between the sealing sleeve 41 and the vibration short section 3 is sealed, which further enhances the overall sealing performance of the equipment, prevents drilling fluid from leaking from the connection, and solves the problem of weak sealing at the connection of multiple components. The rear connector 4 is provided with a first compression ring 34 and a second compression ring 35. Sealing rings are respectively provided on the first compression ring 34 and the second compression ring 35. The sealing rings enhance the sealing between the compression rings and the inner wall of the vibrating sub 3, preventing drilling fluid from flowing between the compression rings and the vibrating sub 3, thus solving the problem of pressure loss during pressure transmission. The first compression ring 34 and the second compression ring 35 are slidably connected to the vibrating sub 3, with low sliding resistance, ensuring smooth extension and retraction of the rear connector 4, and solving the problem of compression ring slippage and impact on vibration frequency. The 4 has a shoulder 44 corresponding to the first extrusion ring 34 and the second extrusion ring 35. The shoulder 44 can accurately position the extrusion ring and ensure effective contact between the extrusion ring and the disc spring 36, thus solving the problem of inaccurate positioning of the extrusion ring and inability to effectively compress the disc spring 36. The disc spring 36 is located between the second extrusion ring 35 and the second extrusion ring 35, and between the second extrusion ring 35 and the sealing sleeve 41. The layout of the double disc spring 36 can enhance the stability of the reset force and buffer the impact force, thus solving the problem of insufficient reset force and easy fatigue damage of a single disc spring 36.

[0023] Please see Figure 2 and Figure 6 The movable component 31 is located at the lower end of the rear connector 4. A funnel-shaped through hole 33 is provided on the inner side of the movable component 31. An impact liner 32 is fixedly connected to the end of the movable component 31 near the rear connector 4. The impact liner 32 is made of high-hardness wear-resistant material, which can reduce wear during the impact process, extend the service life of the movable component 31, and solve the problem of rapid component damage caused by frequent impacts. The upper diameter of the funnel-shaped through hole 33 is larger than the diameter of the through hole in the rear connector 4, and the lower diameter of the funnel-shaped through hole 33 is smaller than the diameter of the through hole in the lower end of the pulse sub 1. This structure can realize the accelerated flow of drilling fluid, increase the force of drilling fluid impacting the movable component 31, and solve the problem of insufficient drilling fluid impact force and inability to effectively drive the movable component 31. At the same time, the accelerated drilling fluid can also enhance the driving effect on subsequent rotating components.

[0024] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4The upper end of the screw rotor 11 is connected to a sealed bearing 13, which is connected inside the pulse stub 1. The sealed bearing 13 ensures the smooth rotation of the screw rotor 11, and its sealing structure prevents drilling fluid from entering the bearing, thus solving the problem of bearings being easily contaminated by drilling fluid and prone to jamming failure. The upper end of the screw rotor 11 is fixedly connected to a connecting shaft 14, which enables stable transmission between the screw rotor 11 and the turbine fan 15, ensuring efficient transmission of rotational power and solving the problem of torque loss during power transmission. Multiple sets of the turbine fans 15 are connected to the connecting shaft 14. A conical guide cap 17 is fixedly connected to the upper end. The guide cap 17 can guide the drilling fluid to divert, prevent the drilling fluid from directly hitting the connecting shaft 14, reduce the scouring and wear of the connecting shaft 14 by the drilling fluid, and at the same time enable the drilling fluid to impact the turbine fan 15 more evenly, solving the problems of uneven force and unstable rotation of the turbine fan 15. Guide blades 16 are arranged between the multiple sets of turbine fans 15. The guide blades 16 are fixed on the pulse stub 1. The guide blades 16 can guide the drilling fluid, improve the efficiency of the drilling fluid impacting the turbine fan 15, further enhance the rotation driving force, and solve the problems of chaotic drilling fluid flow direction and low driving efficiency.

[0025] Please see Figure 3 and Figure 5 The lower end of the screw rotor 11 is connected to a connecting member 111. The connecting member 111 has high transmission precision, ensuring that the rotational power of the screw rotor 11 is accurately transmitted to the moving valve plate 18, thus solving the problem of asynchronous valve plate rotation caused by power transmission deviation. The lower end of the connecting member 111 is fixedly connected to the moving valve plate 18, and a cavity is provided between the moving valve plate 18 and the connecting member 111. The connecting member 111 has multiple communicating holes 112 along its circumference that communicate with the cavity. The communicating holes 112 can guide drilling fluid. The fluid flows smoothly between the moving valve plate 18 and the stationary valve plate 19, ensuring unobstructed flow and solving the problem of drilling fluid stagnation in the valve plate area, which affects flow efficiency. The lower end of the moving valve plate 18 is provided with a stationary valve plate 19, and a sealing bushing 113 is provided on the outside of the stationary valve plate 19. The sealing bushing 113 can enhance the sealing between the stationary valve plate 19 and the inner wall of the pulse sub 1, preventing drilling fluid from flowing out of the valve plate and ensuring the effect of flow rate change on pressure regulation, thus solving the problem of poor sealing and pressure regulation failure in the valve plate area.

[0026] The moving valve plate 18 has a first flow passage 181 inside, which is eccentrically positioned. The stationary valve plate 19 has a second flow passage 191, which is also eccentrically positioned. The diameter of the first flow passage 181 is smaller than the diameter of the second flow passage 191. The eccentrically positioned flow passage, in conjunction with the rotation of the moving valve plate 18, can achieve periodic changes in flow rate, thereby generating periodic reverse pressure, providing a power source for high-frequency axial vibration, and solving the problem that traditional equipment cannot generate stable high-frequency vibration. Flow passages of different diameters can further optimize the amplitude of flow rate changes, making the pressure changes more in line with vibration requirements, and solving the problems of insufficient vibration amplitude and poor pressure relief effect.

[0027] The front connector 5 is equipped with a ball seat 51 inside, and a placement groove 53 is opened on the ball seat 51. A steel ball 52 is placed in the placement groove 53. The steel ball 52 can jump in the ball seat 51 under the push of drilling fluid, generating radial reciprocating vibration. Combined with axial high-frequency vibration, it forms a "mechanical + hydraulic" composite pressurization form, which solves the problems of inaccurate drilling pressure and low rock breaking efficiency of simple mechanical pressurization. The placement groove 53 can limit the steel ball 52, prevent the steel ball 52 from deviating during the jumping process, and ensure the stability of radial vibration, thus solving the problem of chaotic radial vibration and ineffective rock breaking assistance.

[0028] Furthermore, the hydraulic energy of the drilling fluid is converted into rotational power by components such as the screw rotor 11 and turbine fan 15 inside the pulse sub 1, which drives the moving valve plate 18 to rotate. This causes the flow holes of the moving and stationary valve plates 19 to periodically overlap and separate, generating periodic reverse pressure that drives the moving part 31 to impact the disc spring 36. Combined with the reset action of the disc spring 36, this achieves high-frequency axial extension and retraction vibration of the rear connector 4, breaking the "stick-slip effect" between the drill string and the well wall, converting static friction into dynamic friction, and reducing frictional resistance. At the same time, the steel ball 52 inside the front connector 5 generates radial reciprocating vibration under the push of the drilling fluid, realizing "mechanical + hydraulic" composite pressurization, providing more precise and effective drilling pressure for the drill bit, and further alleviating the pressure drag problem. The overall structure achieves adaptive vibration adjustment through hydraulic drive, without the need for an additional power source, and is suitable for complex drilling scenarios such as highly deviated wells and horizontal wells, ultimately improving the rock breaking efficiency of the drill bit and the drilling speed of the drilling machinery.

[0029] When using this invention: The first step is preliminary assembly and inspection. First, assemble all core components of the device according to the preset assembly relationship, ensuring the tight connections between pulse sub 1 and connecting sleeve 2, connecting sleeve 2 and vibration sub 3, vibration sub 3 and rear connector 4, and pulse sub 1 and front connector 5. Simultaneously, check the integrity of the installation of sealing components such as sealing rings 43 and sealing bushings 113 to prevent drilling fluid leakage during subsequent operations. Then, connect the assembled device to the drilling system, with the rear connector 4 connecting to the downhole delivery pipeline and the front connector 5 connecting to the drill bit. After completing the overall installation, recheck the sliding fit between the sealing sleeve 41 and the rear connector 4, and the return flexibility of the disc spring 36, ensuring that there is no jamming in any moving parts.

[0030] The second step is startup and power drive. After the assembly and inspection are completed, the drilling system is started, and high-pressure drilling fluid is introduced into the pipeline. The drilling fluid flows sequentially through the rear connector 4 and the vibrating sub-section 3, reaching the funnel-shaped through-hole 33 at the moving part 31. After being accelerated through the funnel-shaped through-hole 33, it impacts the turbine fan 15 and screw rotor 11 inside the pulse sub-section 1. Under the guidance of the guide vane 16, the drilling fluid acts more precisely on the turbine fan 15, driving the connecting shaft 14 and screw rotor 11 to rotate stably. At the same time, the guide cap 17 prevents the drilling fluid from directly impacting the connecting shaft 14, ensuring the stable operation of the rotating parts.

[0031] The third step involves the generation of combined vibration and the relief of pressure. During the rotation of the screw rotor 11, the moving valve plate 18 is driven to rotate synchronously through the connecting piece 111. Since the first flow hole 181 on the moving valve plate 18 and the second flow hole 191 on the stationary valve plate 19 are both eccentrically set, they will periodically achieve "overlap-separation": when the two flow holes separate, the drilling fluid flow rate decreases sharply, generating reverse pressure that impacts the moving part 31, pushing the moving part 31 to drive the rear connector 4 to extend outward and squeeze the disc spring 36; when the two flow holes overlap, the flow rate increases, the reverse pressure weakens, the disc spring 36 resets and drives the rear connector 4 to retract, forming high-frequency axial vibration, breaking the "stick-slip effect" between the drill string and the well wall, and converting static friction into dynamic friction to reduce resistance. At the same time, when the drilling fluid flows through the front connector 5, it pushes the steel ball 52 to bounce in the placement groove 53 of the ball seat 51, generating radial reciprocating vibration, forming a "mechanical + hydraulic" composite pressurization, providing precise and effective drilling pressure for the drill bit, further alleviating the pressure problem and improving rock breaking efficiency.

[0032] The fourth step is operation monitoring and termination. During the operation, no additional adjustments are required; the device can maintain stable vibration by relying on the drilling fluid flow rate. If drilling parameters need to be adjusted, the vibration frequency can be indirectly adjusted by regulating the drilling fluid pressure. After the drilling operation is completed, first stop the supply of high-pressure drilling fluid. After the pressure inside the device is completely released and all vibrating components have stopped, disconnect the front connector 5 from the drill bit and the rear connector 4 from the downhole pipeline in sequence. Then clean and inspect all components of the device, paying special attention to the condition of worn parts such as the impact liner 32 and the sealing ring 43, to prepare for subsequent reuse.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drill string device for adaptive hydraulic pressure relief in downhole sliding drilling, characterized in that: It includes a pulse sub (1), one end of which is connected to a connecting sleeve (2), the other end of which is connected to a vibration sub (3), the other end of which is connected to a rear connector (4), and the other end of which is connected to a front connector (5). The vibrating section (3) is provided with a disc spring (36) for driving the rear connector (4) to reset, and the vibrating section (3) is provided with a movable part (31) for impacting and compressing the disc spring (36). The pulse section (1) is provided with a screw rotor (11) for generating rotational force, and a screw motor liner (12) is provided inside the pulse section (1). A valve core is connected to the lower end of the screw rotor (11), and multiple sets of turbine fans (15) for generating rotational force are provided at the upper end of the screw rotor (11).

2. The drill string equipment for adaptive hydraulic pressure relief in downhole sliding drilling according to claim 1, characterized in that: A sealing sleeve (41) is slidably connected to the outer side of the rear connector (4). A sealing ring (43) for sealing the gap between the rear connector (4) and the sealing sleeve (41) is provided on the outer side of the rear connector (4). A movable cavity (42) is provided between the rear connector (4) and the sealing sleeve (41) to allow for the reciprocating motion of the rear connector (4). The lower end of the sealing sleeve (41) is fixedly connected to the vibration short section (3). The connection between the sealing sleeve (41) and the vibration short section (3) is sealed.

3. The drill string equipment for adaptive hydraulic pressure relief in downhole sliding drilling according to claim 1, characterized in that: The rear connector (4) is provided with a first compression ring (34) and a second compression ring (35). The first compression ring (34) and the second compression ring (35) are respectively provided with sealing rings. The first compression ring (34) and the second compression ring (35) are slidably connected to the vibration short section (3). The rear connector (4) is provided with a shoulder (44) corresponding to the first compression ring (34) and the second compression ring (35). The disc spring (36) is located between the second compression ring (35) and the second compression ring (35), and between the second compression ring (35) and the sealing sleeve (41).

4. The drill string equipment for adaptive hydraulic pressure relief in downhole sliding drilling according to claim 1, characterized in that: The movable part (31) is located at the lower end of the rear connector (4). A funnel-shaped through hole (33) is provided on the inner side of the movable part (31). An impact liner (32) is fixedly connected to one end of the movable part (31) near the rear connector (4). The upper diameter of the funnel-shaped through hole (33) is larger than the diameter of the through hole in the rear connector (4). The lower diameter of the funnel-shaped through hole (33) is smaller than the diameter of the through hole in the lower end of the pulse sub (1).

5. The drill string equipment for adaptive hydraulic pressure relief in downhole sliding drilling according to claim 1, characterized in that: The upper end of the screw rotor (11) is connected to a sealed bearing (13), which is connected inside the pulse stub (1). The upper end of the screw rotor (11) is fixedly connected to a connecting shaft (14), and multiple sets of turbine fans (15) are connected to the connecting shaft (14). The upper end of the connecting shaft (14) is fixedly connected to a conical guide cap (17), and guide vanes (16) are provided between the multiple sets of turbine fans (15). The guide vanes (16) are fixed on the pulse stub (1).

6. The drill string equipment for adaptive hydraulic pressure relief in downhole sliding drilling according to claim 1, characterized in that: The lower end of the screw rotor (11) is connected to a connecting member (111), and the lower end of the connecting member (111) is fixedly connected to a moving valve plate (18). A cavity is provided between the moving valve plate (18) and the connecting member (111). Multiple communicating holes (112) communicating with the cavity are provided along the circumference of the connecting member (111). A stationary valve plate (19) is provided at the lower end of the moving valve plate (18), and a sealing bushing (113) is provided on the outer side of the stationary valve plate (19).

7. The drill string device for adaptive hydraulic pressure relief in downhole sliding drilling according to claim 6, characterized in that: The moving valve plate (18) has a first flow passage (181) inside, which is eccentrically positioned. The stationary valve plate (19) has a second flow passage (191) on it, which is eccentrically positioned. The diameter of the first flow passage (181) is smaller than the diameter of the second flow passage (191).

8. The drill string equipment for adaptive hydraulic pressure relief in downhole sliding drilling according to claim 1, characterized in that: The front connector (5) is provided with a ball seat (51) inside, and a placement groove (53) is provided on the ball seat (51), and a steel ball (52) is placed in the placement groove (53).

Images