Bidirectional vibration reduction oil and gas well cleaning tool based on spring torsion bar

Abstract

The invention discloses a bi-directional vibration reduction oil and gas well cleaning tool based on a spring torsion bar, and relates to the technical field of petroleum and natural gas engineering, the bi-directional vibration reduction oil and gas well cleaning tool comprises an outer shell, a vibration reduction joint and a cleaning joint which are coaxially connected from top to bottom, and the outer shell comprises a drill rod head, a double-male joint and a double-female joint; the drill rod head, the double-male connector and the double-female connector are sequentially connected through threads. According to the bidirectional vibration reduction oil and gas well cleaning tool based on the spring torsion bar, the spline flange and the elastic torsion bar are connected through the spline and assembled on the inner wall of the double-male connector, and meanwhile the spring vibration reduction base arranged on the drill rod in a sleeving mode and the spring arranged between the spring vibration reduction base and the inner wall of the double-male connector are combined; circumferential torsional vibration energy can be dissipated through torsional deformation of the elastic torsion bar, and axial impact energy is absorbed through compression and release of the spring. Due to the arrangement of the first positioning sleeve, an accurate axial assembly reference is provided for the whole axial vibration reduction system, and the preset working load of the spring is ensured.

Description

Technical Field

[0001] This invention relates to the field of oil and gas engineering technology, and more specifically to a bidirectional vibration-damping oil and gas well cleaning tool based on a spring torsion bar. Background Technology

[0002] In oil and gas drilling operations, with increasing well depth and more complex well types, such as the widespread application of deep wells, ultra-deep wells, and extended reach wells, the vibration problem encountered by the drill string downhole is becoming increasingly prominent. These vibrations mainly include axial vibration and circumferential torsional vibration. The interaction between the two not only accelerates the wear of the drill bit and drill string and reduces the mechanical drilling rate, but may also cause serious accidents such as drill string breakage, directly affecting drilling efficiency and safety. To address this challenge, the industry has developed a variety of vibration reduction technologies, including passive, active, and semi-active vibration reduction devices. These technologies have alleviated the vibration problem of the drill string to some extent. However, most existing technologies focus on vibration suppression in a single direction, making it difficult to effectively cope with the combined axial and circumferential vibrations in the complex and ever-changing downhole environment.

[0003] However, current technology lacks an integrated tool that can simultaneously integrate axial and circumferential vibration reduction functions and continuously and effectively clean the wellbore annulus during drilling. In actual drilling operations, especially in long horizontal wells with extended reach, there is a complex interaction between drill string vibration and cuttings bed formation. Existing vibration reduction tools are often independent of wellbore cleaning equipment, which means that while suppressing drill string vibration, they cannot remove cuttings deposits in the wellbore annulus in a timely manner. This not only increases the friction and torque of the drill string, but may also trigger stronger vibrations due to the presence of the cuttings bed, forming a vicious cycle. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to provide a bidirectional vibration-damping oil and gas well cleaning tool based on a spring torsion bar, in order to solve the problem that there is no integrated tool in the prior art that can simultaneously integrate axial and circumferential bidirectional vibration damping functions and continuously and effectively clean the wellbore annulus during drilling.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a bidirectional vibration-damping oil and gas well cleaning tool based on a spring torsion bar, comprising an outer shell, a vibration-damping section, and a cleaning section coaxially connected from top to bottom, wherein the outer shell includes a drill pipe head, a double male connector, and a double female connector;

[0006] The drill bit, the double male connector, and the double female connector are connected sequentially by threads.

[0007] The vibration damping joint is disposed within the cavity formed by the drill bit and the double male connector;

[0008] The vibration damping joint includes a spline flange, which is assembled on the inner wall of the double male connector. The vibration damping joint also includes an elastic torsion bar, the two ends of which are connected to the spline flange via splines. The vibration damping joint also includes a spring damping seat sleeved on the drill pipe. The vibration damping joint also includes a spring, which is disposed between the spring damping seat and the inner wall of the double male connector.

[0009] The cleaning section is located on the downstream side of the double female connector. The cleaning section includes a bearing bracket fixed inside the double female connector, a central shaft supported by the bearing bracket, a turbine stator fixed inside the double female connector, a turbine rotor fixed on the central shaft, and an inner magnetic sleeve.

[0010] The inner magnetic sleeve is connected to the central shaft via a spline, and the inner magnetic sleeve is provided with an inner magnetic tile;

[0011] The cleaning section also includes an outer magnetic sleeve fixed to the outside of the double female connector. The outer magnetic sleeve is provided with an outer magnetic tile. The cleaning section also includes a housing cleaning sleeve. The housing cleaning sleeve is supported on the outer magnetic sleeve by a first bearing. The housing cleaning sleeve is fixedly connected to the outer magnetic sleeve.

[0012] Furthermore, the vibration damping joint also includes a first positioning sleeve sleeved on the drill pipe, the first positioning sleeve being located on the upstream side of the spring vibration damping seat.

[0013] Furthermore, the cleaning section also includes a second positioning sleeve, which is fitted onto the central shaft and provides axial positioning for the inner magnetic sleeve.

[0014] Furthermore, the cleaning section also includes a spline connecting shaft connected to the downstream end of the central shaft.

[0015] Furthermore, the central shaft is supported on a bearing frame by a second bearing and a third bearing.

[0016] Furthermore, the cleaning section also includes a first elastic retaining ring, which axially positions the first bearing.

[0017] Furthermore, the cleaning joint also includes a second elastic retaining ring, a third elastic retaining ring, and a fifth elastic retaining ring. The second and third elastic retaining rings provide axial positioning for the second bearing, and the fifth elastic retaining ring provides axial positioning for the third bearing.

[0018] Furthermore, the cleaning section also includes a fourth elastic retaining ring, which provides auxiliary axial positioning for the inner magnetic sleeve.

[0019] Furthermore, the spline flange and the inner wall of the double male connector have a transition fit, and the spring damping seat and the drill pipe have a clearance fit.

[0020] Furthermore, the bearing bracket and the double female connector are interference fit, and the outer magnetic sleeve and the double female connector are interference fit.

[0021] Compared with existing technologies, the bidirectional vibration-damping oil and gas well cleaning tool based on a spring-torsion bar provided by this invention connects a splined flange and an elastic torsion bar via a spline and assembles them on the inner wall of a double male connector. Simultaneously, a spring-damping seat fitted on the drill pipe and a spring positioned between the spring-damping seat and the inner wall of the double male connector are combined. During downhole operation, the tool dissipates circumferential torsional vibration energy through the torsional deformation of the elastic torsion bar and absorbs axial impact energy through the compression and release of the spring. The first positioning sleeve provides a precise axial assembly reference for the entire axial vibration damping system, ensuring the preset working load of the spring. The integrated design, combining the bidirectional vibration damping mechanism within the same cavity, enables the tool to effectively and synchronously suppress the combined axial and circumferential vibrations of the drill string during drilling, creating a stable, low-vibration working environment for downstream cleaning components and reducing the overall risk of damage to precision transmission components from downhole vibration.

[0022] Through a hydraulic drive unit consisting of a turbine stator and a turbine rotor, a non-contact magnetic transmission unit consisting of an inner and outer magnetic sleeve coupled by inner and outer magnetic tiles, and a precision support and positioning system consisting of a bearing bracket, a second bearing, a third bearing, a first bearing, and various elastic retaining rings, the tool can efficiently convert the hydraulic energy of the drilling fluid into mechanical energy to drive the rotation of the outer cleaning sleeve during drilling fluid circulation. The magnetic transmission achieves a fully sealed, contactless transmission of power from the internal rotating shaft to the external actuators, physically isolating it from direct impact from vibration and fluid. The combination of precise bearing support, positioning sleeves, and elastic retaining rings ensures smooth operation and accurate positioning of the central shaft and the entire transmission system at high speeds. This allows the cleaning section to not only efficiently agitate the wellbore annulus and remove cuttings beds, but also maintain high reliability in the harsh vibration and fluid environment of the well, ensuring its service life and cleaning efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional structural schematic diagram provided for an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the spring damping seat structure provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the outer shell cleaning sleeve structure provided in an embodiment of the present invention;

[0028] Figure 5 A cross-sectional view provided for an embodiment of the present invention;

[0029] Figure 6 A vertical cross-sectional view provided for an embodiment of the present invention;

[0030] Figure 7 A left view provided for an embodiment of the present invention;

[0031] Figure 8 The right view provided for an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Spline flange; 2. Elastic torsion bar; 3. First positioning sleeve; 4. Spring damping seat; 5. Spring; 6. Bearing bracket; 7. First elastic retaining ring; 8. First bearing; 9. Housing cleaning sleeve; 10. Outer magnetic sleeve; 11. Turbine stator; 12. Turbine rotor; 13. Second bearing; 14. Second elastic retaining ring; 15. Third elastic retaining ring; 16. Fourth elastic retaining ring; 17. Outer magnetic tile; 18. Inner magnetic tile; 19. Spline connecting shaft; 20. Third bearing; 21. Fifth elastic retaining ring; 22. Double female connector; 23. Double male connector; 24. Drill rod head; 25. Drill rod; 26. Central shaft; 27. Second positioning sleeve; 28. Inner magnetic sleeve. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] As attached Figure 1 To be continued Figure 8 As shown:

[0036] Example 1:

[0037] The present invention provides a bidirectional vibration-damping oil and gas well cleaning tool based on a spring torsion bar, comprising an outer shell, a vibration-damping section and a cleaning section coaxially connected from top to bottom, the outer shell including a drill pipe head 24, a double male connector 23 and a double female connector 22;

[0038] The drill pipe head 24, the double male connector 23, and the double female connector 22 are connected sequentially by threads;

[0039] The vibration damping joint is installed in the cavity formed by the drill pipe head 24 and the double male connector 23;

[0040] The vibration damping joint includes a spline flange 1, which is assembled on the inner wall of the double male connector 23. The vibration damping joint also includes an elastic torsion bar 2, the two ends of which are connected to the spline flange 1 via splines. The vibration damping joint also includes a spring damping seat 4 sleeved on the drill pipe 25. The vibration damping joint also includes a spring 5, which is disposed between the spring damping seat 4 and the inner wall of the double male connector 23.

[0041] The cleaning section is located on the downstream side of the double female connector 22. The cleaning section includes a bearing bracket 6 fixed in the double female connector 22, a central shaft 26 supported by the bearing bracket 6, a turbine stator 11 fixed in the double female connector 22, a turbine rotor 12 fixed on the central shaft 26, and an inner magnetic sleeve 28.

[0042] The inner magnetic sleeve 28 is connected to the central shaft 26 via a spline, and the inner magnetic sleeve 28 is provided with an inner magnetic tile 18.

[0043] The cleaning section also includes an outer magnetic sleeve 10 fixed to the outside of the double female connector 22. The outer magnetic sleeve 10 is provided with an outer magnetic tile 17. The cleaning section also includes a housing cleaning sleeve 9. The housing cleaning sleeve 9 is supported on the outer magnetic sleeve 10 by a first bearing 8. The housing cleaning sleeve 9 is fixedly connected to the outer magnetic sleeve 10.

[0044] The vibration damping joint also includes a first positioning sleeve 3 sleeved on the drill pipe 25. The first positioning sleeve 3 is located on the upstream side of the spring vibration damping seat 4. The spline flange 1 and the inner wall of the double male connector 23 are in transition fit, and the spring vibration damping seat 4 and the drill pipe 25 are in clearance fit.

[0045] In use, the drill bit 24 serves as the upper connection and sealing interface of the tool, connecting to the upper drill string. Its internal flow channel ensures the inflow of drilling fluid. Downstream, it is rigidly connected to the double male connector 23 via tapered threads, forming the main structure for pressure bearing and force transmission. The double male connector 23 is not only part of the outer casing, but its inner wall is also fitted with a spline flange 1 via a transition fit. The spline flange 1 is the mechanical interface for torsional vibration, transmitting the irregular torsional motion of the drill string system to the inner wall of the double male connector 23 directly through its internal spline groove. The elastic torsion bar 2 has external splines at both ends, precisely meshing with the internal spline groove of the spline flange 1. The spline connection ensures the uniformity and reliability of torque transmission. The elastic torsion bar 2, as the core torsional vibration damping element, is made of alloy steel with high fatigue strength. When the spline flange 1 inputs torsional vibration, the elastic torsion bar 2 undergoes elastic torsional deformation, converting the intense instantaneous torsional vibration energy into elastic potential energy within the material and dissipating it, thereby effectively buffering and isolating the circumferential impact transmitted to the downstream cleaning joint. The drill pipe 25 extends from the center of the drill pipe head 24, passing through the entire damping joint cavity, and is the core path for the downward transmission of axial force and torque of the drill string. The first positioning sleeve 3, fitted on the drill pipe 25, is fixed in a set position by means of tightening or interference fit. It is located on the upstream side of the spring damping seat 4, providing a precise axial assembly reference for the entire axial damping system and ensuring that the spring 5 has a preset initial compression. The spring damping seat 4 is also fitted on the drill pipe 25 and is designed with a clearance fit between it and the drill pipe 25, so that it can slide freely along the axial direction of the drill pipe 25 when bearing axial load, while avoiding unnecessary radial friction; the lower end face of the spring damping seat 4 directly contacts the upper end face of the spring 5. The spring 5 is pre-tightly installed in a specially designed annular space between the spring damping seat 4 and the inner wall of the double male connector 23. When the drill string vibrates longitudinally, the drill pipe 25 drives the spring damping seat 4 to compress or release the spring 5. The spring 5 absorbs and releases the axial impact and vibration energy through its elastic deformation, realizing the attenuation and buffering of the longitudinal vibration of the drill string. Thus, the spline flange 1 and the elastic torsion bar 2 constitute a combined active and passive circumferential torsional vibration reduction system, while the drill pipe 25, the first positioning sleeve 3, the spring damping seat 4 and the spring 5 constitute an axial passive vibration reduction system. The two are integrated into a compact cavity formed by the double male connector 23, which realizes the synchronous suppression of complex axial and torsional bidirectional vibrations downhole, provides a stable working environment for the downstream cleaning section, and directly protects the precision transmission components inside the cleaning section from vibration damage.

[0046] Example 2:

[0047] This embodiment is basically the same as the previous embodiment, except that the cleaning section also includes a second positioning sleeve 27, which is sleeved on the central shaft 26 and provides axial positioning for the inner magnetic sleeve 28. The cleaning section also includes a spline connecting shaft 19, which is connected to the downstream end of the central shaft 26. The central shaft 26 is supported on the bearing frame 6 by a second bearing 13 and a third bearing 20. The cleaning section also includes a first elastic retaining ring 7, which provides axial positioning for the first bearing 8. The cleaning section also includes a second elastic retaining ring 14, a third elastic retaining ring 15, and a fifth elastic retaining ring 21. The second elastic retaining ring 14 and the third elastic retaining ring 15 provide axial positioning for the second bearing 13, and the fifth elastic retaining ring 21 provides axial positioning for the third bearing 20. The cleaning section also includes a fourth elastic retaining ring 16, which provides auxiliary axial positioning for the inner magnetic sleeve 28. The bearing frame 6 and the double female connector 22 are interference-fitted, and the outer magnetic sleeve 10 and the double female connector 22 are also interference-fitted.

[0048] In use, the double female connector 22 serves as the main pressure-bearing shell of the cleaning joint. Inside, a bearing bracket 6 is fixed via an interference fit. The bearing bracket 6 not only provides radial support for the central shaft 26, but its axial water-flow grooves also ensure unobstructed flow in the main circulation channel of the drilling fluid. The central shaft 26, as the core drive shaft, is precisely mounted on the bearing bracket 6 at both ends via high-load-bearing second bearings 13 and third bearings 20. These bearings are axially positioned bidirectionally by second elastic retaining rings 14, third elastic retaining rings 15, and fifth elastic retaining rings 21, ensuring that the radial runout and axial movement of the central shaft 26 under high-speed rotation are strictly controlled within the design range, resulting in smooth operation. At the drive end, the turbine stator 11, fixed within the flow channel of the double female connector 22, guides the drilling fluid flow, impacting the turbine rotor 12 fixed on the central shaft 26, efficiently converting the hydraulic energy of the drilling fluid into mechanical energy to drive the rotation of the central shaft 26. At the transmission end, the upstream end of the central shaft 26 transmits torque to the inner magnetic sleeve 28 via a spline. The inner magnetic sleeve 28 is precisely axially and auxiliaryly positioned by the downstream second positioning sleeve 27 and the fourth elastic retaining ring 16 on the side to prevent it from shifting during operation. The outer circumferential surface of the inner magnetic sleeve 28 is inlaid with inner magnetic tiles 18 arranged according to a specific polarity pattern. Corresponding to the inner magnetic sleeve 28 without contact is the outer magnetic sleeve 10 fixed to the outside of the double female connector 22. The two are rigidly connected by an interference fit. The inner side of the outer magnetic sleeve 10 is inlaid with an outer magnetic tile 17, and a strong magnetic coupling magnetic field is formed between the inner magnetic tile 18 and the outer magnetic tile 17. When the central shaft 26 drives the inner magnetic sleeve 28 and the inner magnetic tile 18 to rotate, the magnetic lines of force between the permanent magnets drive the outer magnetic sleeve 10 and the outer magnetic tile 17 to rotate synchronously, thereby realizing the non-contact, fully sealed transmission of torque from the internal rotating shaft to the external stationary shell. The rotation of the outer magnetic sleeve 10 is transmitted to the outer cleaning sleeve 9 via the first bearing 8, which is axially positioned by the first elastic retaining ring 7, ensuring the reliability of the cleaning sleeve's rotational support. Finally, the remaining power is transmitted downstream to the drill string via the splined connecting shaft 19 at the downstream end of the central shaft 26. The entire system achieves multi-stage efficient power transmission from drilling fluid to turbine, through the central shaft 26, spline, and magnetic coupling, to the cleaning sleeve. Furthermore, key transmission links are physically isolated through magnetic coupling, decoupling the cleaning sleeve, which performs the cleaning function, from the drill string transmission system, which bears complex downhole loads and vibrations. This significantly improves the reliability and lifespan of the cleaning components under harsh working conditions.

[0049] Application example:

[0050] In practical application in the drilling of a long horizontal directional well, as the inclination angle increases, cuttings easily deposit at the lower edge of the wellbore annulus under gravity, forming a hard cuttings bed. This not only drastically increases the friction and torque of the drill string, leading to risks such as pressure buildup and stuck wire, but also causes irregular loads to induce strong axial and circumferential combined vibrations in the drill string, severely affecting the rate of penetration (ROP) and threatening the safety of the drill bit, measurement-while-drilling (MWD) instruments, and the lower drilling assembly. Furthermore, traditional vibration suppression tools and wellbore cleaning tools operate independently, failing to address these coupled challenges at the system level. Therefore, there is an urgent need for an integrated tool that can efficiently clean the wellbore while effectively suppressing harmful drill string vibrations.

[0051] When drilling reaches the horizontal section, this tool is lowered to the predetermined position at the bottom of the well along with the drill string. After the tool enters the well, its drill pipe head 24 connects with the upper drill string, forming a continuous drill string and drilling fluid circulation channel. When normal drilling and circulation begin, the tool immediately enters the working state.

[0052] On one hand, the vibration damping joint begins to perform its core vibration suppression function. The severe longitudinal vibrations generated by the drill string system during rock breaking and traversing complex strata are transmitted to the spring damping seat 4 via the drill pipe 25. Due to its clearance fit design with the drill pipe 25, the spring damping seat 4 can slide freely axially, thereby compressing or releasing the spring 5 beneath it. The spring 5, through its elastic deformation, continuously absorbs and releases axial impact energy, effectively attenuating longitudinal vibrations. Simultaneously, the torsional impacts and irregular circumferential vibrations generated by the stick-slip effect of the drill string are transmitted to the inner wall of the double male connector 23. The spline flange 1, assembled on its inner wall, serves as a mechanical interface, inputting this torsional motion. The elastic torsion bar 2, precisely meshed with the spline flange 1 via splines, acts as a highly elastic element, undergoing reciprocating elastic torsional deformation, converting harmful torsional vibration energy into material internal energy and dissipating it. The first positioning sleeve 3 provides a precise axial assembly reference for the entire axial vibration damping system, ensuring that the spring 5 has a preset, stable initial working load. Thus, the torsional vibration damping system composed of spline flange 1 and elastic torsion bar 2 works in conjunction with the axial vibration damping system composed of drill pipe 25, spring damping seat 4 and spring 5 to achieve synchronous isolation and suppression of complex bidirectional vibrations in the cavity of double male joint 23, creating a stable input environment for the downstream clean joint.

[0053] On the other hand, the cleaning section starts simultaneously, performing efficient wellbore cleaning tasks. When the drilling fluid flows through the flow channel within the double female connector 22, it first drives the turbine unit. The stationary turbine stator 11 guides and rectifies the fluid flow, causing it to efficiently impact the turbine rotor 12 fixed on the central shaft 26, thereby converting the hydraulic energy of the drilling fluid into mechanical energy that drives the central shaft 26 to rotate. The central shaft 26, as the core of the cleaning transmission system, is supported at both ends by the second bearing 13 and the third bearing 20 on the bearing bracket 6 fixed within the double female connector 22 with high precision, and is reliably axially positioned in both directions by the second elastic retaining ring 14, the third elastic retaining ring 15, and the fifth elastic retaining ring 21, ensuring its stability under high-speed rotation.

[0054] The rotational torque obtained by the central shaft 26 is transmitted to the inner magnetic sleeve 28 via the spline at the upstream end. The inner magnetic sleeve 28 is primarily axially positioned by the second positioning sleeve 27 installed downstream, and further positioned by the fourth elastic retaining ring 16 on the side, ensuring the accuracy and stability of its working position. The inner magnetic tile 18 embedded on the outer surface of the inner magnetic sleeve 28 rotates at high speed, forming a strong magnetic coupling magnetic field between it and the outer magnetic tile 17 embedded in the outer magnetic sleeve 10, which is non-contact and fixed to the outside of the double female connector 22. Through the interaction of magnetic lines of force, the torque is transmitted to the outer magnetic sleeve 10 non-contactly and in a fully sealed manner. This magnetic transmission process realizes the crossing of rotational power from the internal shaft system to the external stationary housing, physically isolating the direct transmission of downhole vibration to the cleaning actuator.

[0055] The rotational motion of the outer magnetic sleeve 10 is transmitted to the outer cleaning sleeve 9 via the first bearing 8 mounted externally. The first bearing 8 is axially positioned by the first elastic retaining ring 7 to ensure its operational reliability. Ultimately, the outer cleaning sleeve 9 is driven to rotate at high speed, and the blades or flow channels on its outer surface violently agitate the wellbore annulus, especially generating strong turbulence and mechanical scraping action at the lower edge of the annulus. This effectively breaks up and lifts the deposited cuttings bed, allowing it to re-enter the mainstream of the drilling fluid and be carried out of the wellbore. Simultaneously, the downstream end of the central shaft 26 transmits the remaining rotational power to the downstream drilling tools (such as the drill bit) via the splined connecting shaft 19, ensuring the continuity of drilling operations.

[0056] Throughout the drilling and circulation process, the tool's damping section and cleaning section work in tandem. The damping section significantly reduces the vibration amplitude transmitted to the cleaning section, protecting precision transmission components such as turbines, bearings, and magnets, greatly improving the cleaning section's reliability and lifespan. Meanwhile, the cleaning section efficiently removes cuttings, improving wellbore conditions and reducing abnormal vibration sources caused by friction and pressure, which in turn lowers the overall vibration level of the drill string. This positive feedback loop ensures the safe, efficient, and smooth drilling of the horizontal section of this extended reach well.

[0057] Working Principle: During drilling operations, this tool is lowered into the well along with the drill string. As the drill string rotates and pumps drilling fluid, the tool begins to work in tandem. The axial and circumferential torsional vibrations of the drill string system are first transmitted to the tool's damping joint. The axial vibration acts on the spring damping seat 4 through the drill pipe 25. Since the spring damping seat 4 and the drill pipe 25 are designed with a clearance fit, it can slide freely along the axial direction, thereby compressing or releasing the spring 5 behind it. The spring 5 continuously absorbs and buffers the longitudinal impact energy through its elastic deformation. At the same time, the torsional vibration of the drill string is transmitted to the inner wall of the double male connector 23, and is received by the spline flange 1 assembled on its inner wall. The spline flange 1 drives the elastic torsion bar 2, which is precisely meshed with it, through its inner spline groove. The elastic torsion bar 2, as a highly elastic element, undergoes reciprocating elastic torsional deformation, thereby converting the harmful circumferential vibration energy into the internal energy of the material and dissipating it. The first positioning sleeve 3, fitted onto the drill pipe 25, provides a precise initial assembly position for the entire axial vibration damping system, ensuring that the spring 5 has a preset, stable initial compression, thus optimizing the vibration damping performance. The damping joint, through the torsional vibration damping system composed of the spline flange 1 and the elastic torsion bar 2, and the axial vibration damping system based on the drill pipe 25, the spring damping seat 4, and the spring 5, achieves synchronous isolation and suppression of complex bidirectional downhole vibrations within the cavity formed by the double male connector 23, thereby creating a stable, low-vibration input environment for the downstream cleaning joint. Simultaneously, the cleaning joint begins its wellbore cleaning function. When the drilling fluid flows through the tool, it first enters the drive section of the cleaning joint. The turbine stator 11, fixed within the flow channel of the double female connector 22, guides and rectifies the fluid flow, causing it to efficiently impact the turbine rotor 12 fixed on the central shaft 26, thereby converting the hydraulic energy of the drilling fluid into mechanical energy that drives the central shaft 26 to rotate. The central shaft 26, as the core of the cleaning transmission system, is precisely supported at both ends by the second bearing 13 and the third bearing 20 on the bearing bracket 6 fixed within the double female connector 22. It is reliably positioned bidirectionally by the second elastic retaining ring 14, the third elastic retaining ring 15, and the fifth elastic retaining ring 21, ensuring its radial and axial stability under high-speed rotation. The rotational torque obtained by the central shaft 26 is transmitted to the inner magnetic sleeve 28 through a spline connection at its upstream end. The inner magnetic sleeve 28 is primarily axially positioned by the second positioning sleeve 27 installed downstream, and further positioned by the fourth elastic retaining ring 16 on its side, ensuring the accuracy and stability of its working position. The inner magnetic tile 18 embedded on the outer surface of the inner magnetic sleeve 28 rotates at high speed accordingly. The outer magnetic sleeve 10, which corresponds non-contactly to the inner magnetic sleeve 28 and is fixed to the outside of the double female connector 22, has an outer magnetic tile 17 embedded on its inner side. A strong magnetic coupling magnetic field is formed between the inner magnetic tile 18 and the outer magnetic tile 17. Through the interaction of magnetic lines of force, the rotational torque is transmitted to the outer magnetic sleeve 10 in a non-contact and fully sealed manner. This magnetic coupling transmission process physically realizes the transmission of power from the internal rotating shaft to the external housing, while completely isolating the direct impact and contamination of the cleaning actuator by downhole vibration and drilling fluid medium.The rotational motion of the outer magnetic sleeve 10 is transmitted to the outer cleaning sleeve 9 via the first bearing 8, which is axially positioned by the first elastic retaining ring 7 to ensure its operational reliability. Ultimately, the outer cleaning sleeve 9 is driven to rotate at high speed. The blades or flow channels designed on its outer surface violently agitate the annular fluid, especially generating strong local turbulence and mechanical scraping action at the lower edge of the annulus. This effectively breaks up and lifts the deposited cuttings bed, allowing it to re-enter the mainstream of the drilling fluid and be carried to the surface. Furthermore, the remaining rotational power is transmitted downstream of the central shaft 26 via the splined connecting shaft 19 to the downstream drill string, ensuring the continuity of drilling operations such as rock breaking by the drill bit. In summary, this tool, through the synergistic effect of its integrated damping and cleaning sections, creates a highly efficient positive feedback working cycle downhole: the damping section significantly reduces vibration transmitted to the cleaning drive system, protecting precision components such as turbines, bearings, and magnets, and improving the reliability and lifespan of the cleaning section; simultaneously, the cleaning section efficiently removes cuttings beds, improving wellbore conditions and reducing friction and abnormal vibrations caused by wellbore uncleanliness at the source, thereby further reducing the overall vibration level of the drill string. The deep integration and coordinated operation of these two components ultimately achieve the core objective of ensuring safe, efficient, and stable operation during the drilling of complex well structures such as deep wells, ultra-deep wells, and extended reach wells.

[0058] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A spring torsion bar based bi-directional shock absorbing oil and gas well cleaning tool comprising an outer housing, a shock absorbing section and a cleaning section coaxially connected from top to bottom, characterized in that, The outer shell includes a drill rod head (24), a double male joint (23) and a double female joint (22); The drill rod head (24), the double male joint (23) and the double female joint (22) are connected in sequence through threads; The damping section is arranged in a cavity formed by the drill rod head (24) and the double male joint (23); The damping section includes a spline flange (1) which is assembled to the inner wall of the double male joint (23), the damping section further includes an elastic torsion bar (2), both ends of the elastic torsion bar (2) are connected to the spline flange (1) through splines, the damping section further includes a spring damping seat (4) which is sleeved on the drill rod (25), and the damping section further includes a spring (5) which is arranged between the spring damping seat (4) and the inner wall of the double male joint (23); The cleaning section is arranged on the downstream side of the double female joint (22), the cleaning section includes a bearing frame (6) which is fixed in the double female joint (22), the cleaning section further includes a central shaft (26) which is supported by the bearing frame (6), the cleaning section further includes a turbine stator (11) which is fixed in the double female joint (22), the cleaning section further includes a turbine rotor (12) which is fixed on the central shaft (26), and the cleaning section further includes an inner magnetic sleeve (28); The inner magnetic sleeve (28) is connected to the central shaft (26) through splines, and the inner magnetic sleeve (28) is provided with an inner magnetic tile (18); The cleaning section further includes an outer magnetic sleeve (10) which is fixed to the outside of the double female joint (22), the outer magnetic sleeve (10) is provided with an outer magnetic tile (17), the cleaning section further includes an outer shell cleaning sleeve (9) which is supported on the outer magnetic sleeve (10) through a first bearing (8), and the outer shell cleaning sleeve (9) is fixedly connected to the outer magnetic sleeve (10).

2. The spring torsion bar based bi-directional shock attenuation well cleanout tool of claim 1, wherein, The damping section further includes a first positioning sleeve (3) which is sleeved on the drill rod (25), and the first positioning sleeve (3) is located on the upstream side of the spring damping seat (4).

3. The spring torsion bar based bi-directional shock and gas well cleanout tool of claim 1, wherein, The cleaning section further includes a second positioning sleeve (27) which is sleeved on the central shaft (26), and the second positioning sleeve (27) axially positions the inner magnetic sleeve (28).

4. The spring torsion bar based bi-directional shock attenuation well cleanout tool of claim 1, wherein, The cleaning section further includes a spline connection shaft (19) which is connected to the downstream end of the central shaft (26).

5. The spring torsion bar based bi-directional shock attenuation well cleanout tool of claim 1, wherein, The central shaft (26) is supported on the bearing frame (6) through a second bearing (13) and a third bearing (20).

6. The spring torsion bar based bi-directional shock attenuation well cleanout tool of claim 4, wherein, The cleaning section further includes a first elastic retainer (7) which axially positions the first bearing (8).

7. The spring torsion bar based bi-directional shock attenuation well cleanout tool of claim 1, wherein, The cleaning section further includes a second elastic retainer (14), a third elastic retainer (15) and a fifth elastic retainer (21), the second elastic retainer (14) and the third elastic retainer (15) axially position the second bearing (13), and the fifth elastic retainer (21) axially positions the third bearing (20).

8. The spring torsion bar based bi-directional shock attenuation well cleanout tool of claim 1, wherein, The cleaning section further comprises a fourth elastic check ring (16) for assisting in the axial positioning of the inner magnetic sleeve (28).

9. The spring torsion bar based bi-directional shock attenuation well cleanout tool of claim 1, wherein, The spline flange (1) is in transition fit with the inner wall of the double male joint (23), and the spring damping seat (4) is in clearance fit with the drill pipe (25).

10. The spring torsion bar based bi-directional shock attenuation well cleanout tool of claim 1, wherein, The bearing frame (6) is in interference fit with the double female joint (22), and the outer magnetic sleeve (10) is in interference fit with the double female joint (22).

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