Drill string filter hydraulic damper

Abstract

This utility model discloses a hydraulic damper for drilling tools, relating to the field of drilling tool technology. It includes an upper connector and a sleeve. The lower end of the upper connector is located within the sleeve, and a cavity exists between the upper connector and the sleeve. An elastic element and a piston ring are disposed within the cavity. The piston ring is fixed at the lower end of the upper connector. A convex ring is provided on the inner wall of the sleeve. The lower end of the elastic element is supported on the upper end face of the convex ring. The upper connector is supported on the upper end of the elastic element by a stepped surface thereon. The piston ring is located in the cavity below the convex ring. The convex ring has a through hole connecting its upper and lower ends, and also includes a countersunk screw threaded into the through hole. The countersunk screw has a central hole serving as a fluid throttling orifice. A sealing ring is provided between the inner wall of the convex ring and the outer wall of the upper connector. This design not only allows for adjustment of the damping force but also features reliable performance.

Description

Technical Field

[0001] This utility model relates to the field of drilling tool technology, and in particular to a drill tool filter hydraulic damper. Background Technology

[0002] A drill string filter hydraulic damper is a downhole tool that uses hydraulic resistance to convert harmful vibrations on the drill string into heat energy and dissipate it. For axial runout that occurs on the drill string, in order to reduce drilling pressure fluctuations and avoid strong impacts on related components, the hydraulic damper is connected in series on the drill string, allowing the drill string to undergo a certain degree of axial expansion and contraction, which is limited by damping force to counteract drilling pressure fluctuations, making the drilling process more stable, controllable and safe.

[0003] The basic principle of hydraulic dampers is to achieve their function based on the throttling resistance generated when fluid passes through a small orifice to realize energy conversion. The magnitude of the damping force is proportional to the axial runout of the drill string. In this process, the energy is consumed by converting energy into heat. Hydraulic dampers play a vital role in protecting drill strings, improving drilling speed, improving wellbore quality, and reducing drilling risks. Hydraulic dampers are one of the indispensable key tools in modern efficient drilling operations, especially when drilling complex deep wells, hard formations, or high-speed drilling.

[0004] In the prior art, to adjust the stiffness of the drill string, patent application CN201810646647.X provides a drilling damper based on magnetorheological fluid. The method of stiffness adjustment in this technical solution is as follows: by controlling the power supply, the coil generates a changing magnetic field in the liquid cavity. The changing magnetic field interacts with the magnetorheological fluid in the liquid cavity, changing the viscosity of the magnetorheological fluid, thereby changing the damping force. This method is limited by high cost, reliability and durability challenges in harsh downhole environments, system complexity, power consumption issues, and the industry's stringent requirements for cost-effectiveness, and has not yet been widely used in the drilling industry.

[0005] Given the irreplaceable role of hydraulic dampers in drilling operations, it is necessary to further optimize hydraulic damper technology. Utility Model Content

[0006] To address the aforementioned issue of further optimizing hydraulic damper technology, this utility model provides a drill string filter hydraulic damper. This solution not only allows for adjustment of damping force but also features reliable performance, increased mechanical drilling speed, reduced high and low frequency vibrations experienced by the drill string, and reduced stick-slip effects.

[0007] To address the aforementioned problems, the drill string filter hydraulic damper provided by this utility model solves the problems through the following technical points: The drill string filter hydraulic damper includes an upper connector and a sleeve. The lower end of the upper connector is located in the sleeve, and there is a cavity between the upper connector and the sleeve. An elastic element and a piston ring are arranged in the cavity. The piston ring is fixed at the lower end of the upper connector. A convex ring is provided on the inner wall of the sleeve. The lower end of the elastic element is supported on the upper end surface of the convex ring. The upper connector is supported on the upper end of the elastic element by a stepped surface thereon.

[0008] The piston ring is located in the cavity below the convex ring;

[0009] The convex ring is provided with a through hole connecting the upper and lower ends of the convex ring, and also includes a countersunk screw threaded into the through hole, the countersunk screw having a central hole serving as a liquid throttling orifice;

[0010] A sealing ring is provided between the inner wall of the convex ring and the outer wall of the upper connector.

[0011] In application, this solution connects the upper connector and the lower connector connected to the lower end of the sleeve in series on the drill string. In a specific application, the upper end of the upper connector is connected to the lower end of the drill collar, and the lower connector is connected to the drill bit. A splined joint is provided between the upper connector and the sleeve. The splined joint is used to achieve the following: the upper connector can transmit torque to the sleeve, so that the sleeve can rotate with the upper connector. At the same time, the upper connector can slide relative to the sleeve in the axial direction of the sleeve. When the sliding occurs, the elastic element undergoes compression deformation with different deformations, and the position of the piston ring on the sleeve axis changes.

[0012] This design includes a convex ring, which, in conjunction with the piston ring, divides the cavity into an upper cavity above the convex ring and a lower cavity between the convex ring and the piston ring. The elastic element is located in the upper cavity. During use, both the upper and lower cavities are filled with a liquid medium, such as silicone oil. When the drill string vibrates axially, the central hole acts as a liquid throttling orifice connecting the upper and lower cavities. For example, when the drill string jumps upward, the sleeve moves upward relative to the upper connector, the elastic element is further compressed, the length of the lower cavity increases, and the liquid in the upper cavity flows to the lower cavity through the central hole. During this process, the damper isolates vibration and dissipates energy through hydraulic and elastic forces. After the upward jump stops, the elastic element rebounds, forcing the sleeve to move downward relative to the upper connector, and the liquid in the lower cavity is squeezed into the upper cavity through the central hole.

[0013] Unlike existing technologies, this solution uses a convex ring and a piston ring to divide the cavity into two spaces. The liquid medium is confined within the two cavities and flows between them according to the drill pipe's movement. This not only lubricates the friction pairs at the location of the elastic element but also prevents drilling fluid from mixing into the cavities and altering the properties of the liquid medium within the two cavities. Furthermore, the elastic element is positioned above the convex ring. Thus, for the elastic element (especially when using a disc spring), during its repeated deformation, any potential surface spalling is trapped above the convex ring. When the sealing ring fails due to wear caused by surface spalling, the damping characteristics of the damper change, and the elastic element... While providing stable vibration reduction and damping effects, the fit between the piston ring and the sleeve is used to prevent liquid leakage. Therefore, from the perspective of hydraulic stability and sealing reliability, the structural features of this solution are beneficial to ensuring the reliability of the damper and avoiding liquid leakage in the cavity. At the same time, by setting the liquid throttling hole on the center hole of the countersunk screw that is removable relative to the convex ring, the user can install countersunk screws with different center hole diameters on the convex ring according to the current drilling location or geological characteristics of the drilling section. For example, a larger diameter center hole results in a damper with a smaller damping force and stiffness, while a smaller diameter center hole results in a damper with a larger damping force and stiffness. This allows the damper to adjust the damping force according to the specific application scenario.

[0014] In one specific implementation, the sleeve includes a top sleeve and a bottom sleeve, with the lower end of the top sleeve threadedly connected to the upper end of the bottom sleeve.

[0015] The upper connector passes through the top sleeve, and the lower end of the upper connector extends into the bottom sleeve;

[0016] A spline for transmitting torque is provided between the upper connector and the top sleeve;

[0017] The elastic element and piston ring are both located in the cavity between the bottom sleeve and the upper connector.

[0018] In the above scheme, the sleeve is configured to include a top sleeve and a bottom sleeve. The top sleeve, as the upper part of the sleeve, is used to achieve the spline connection with the upper connector. The bottom sleeve, as the part of the sleeve that houses the elastic element and piston ring between the upper connector and the top connector, not only facilitates the assembly of various components, but also allows for separate processing of the top and bottom sleeves. Since the top sleeve requires the processing of spline grooves (the upper connector section is processed into a spline shaft), it uses a thicker blank compared to the bottom sleeve, while the bottom sleeve uses a thinner blank. This method saves raw materials compared to using an integral sleeve. Furthermore, after processing, the spline groove surface and the contact position of the elastic element on the sleeve need to be treated for wear resistance. By setting the sleeve to have two short sections, higher processing accuracy can be obtained while facilitating the surface wear resistance treatment of the corresponding inner wall surfaces.

[0019] As a specific implementation, the upper connector includes a connector sleeve section and an inner sleeve, wherein the upper end of the inner sleeve is threadedly connected to the lower end of the connector sleeve section.

[0020] The structure on the upper connector for forming a spline fit with the top sleeve is located on the connector sleeve section. The sealing ring on the upper connector is located on the inner sleeve, and the piston ring is fixed to the lower end of the inner sleeve.

[0021] In the above scheme, the connector cylinder section is the upper cylinder section of the upper connector, and the inner cylinder section is the lower cylinder section of the upper connector. Similar to the above sleeve structure, since the blank of the inner sleeve does not need to be machined into the spline shaft section and the upper connector, from the perspective of material consumption, the inner sleeve can use a thinner blank (this problem does not exist if the upper connector is made into a forging as a whole). On the other hand, since the outer diameter accuracy and coaxiality of the inner cylinder section affect whether the elastic element is evenly stressed in all circumferential positions and the reliable sealing life of the piston ring, compared with the integral upper connector, the above segmented upper connector structure can be machined in segments, which is beneficial to ensuring the overall coaxiality of the upper connector and the machining accuracy of key positions.

[0022] As one specific implementation, the number of through holes is multiple, and the through holes are arranged at intervals in the circumferential direction of the convex ring;

[0023] Each through hole is equipped with a countersunk screw, and each countersunk screw is equipped with a center hole;

[0024] The countersunk screw is an internal hexagonal screw with an internal hexagonal hole at the nut end, and the upper end of the center hole is connected to the internal hexagonal hole.

[0025] In the above scheme, the use of multiple through holes not only solves the problem of radial vibration of the drill string caused by the offset of the center of gravity of the convex ring relative to its axis, but also makes the pressure distribution and temperature distribution of the liquid medium more uniform in all circumferential positions of the upper and lower cavities during hydraulic damping, thus avoiding the problems of uneven lateral force and circumferential temperature distribution caused by this scheme; the use of countersunk screws is to allow the countersunk screws to be installed on the convex ring, so as to avoid the convex ring affecting the stable support of the elastic element.

[0026] As a specific implementation, the piston ring is threaded to the upper connector through its inner threaded hole, and also includes a locking ring threaded to the upper connector with its upper end face abutting the lower end face of the piston ring.

[0027] In the above scheme, the piston ring connected to the upper connector threadedly allows the piston ring to be replaced as a wear part, which helps to reduce the operating cost of this damper. The locking ring is used to prevent the piston ring from loosening, further improving the reliability of this damper under vibration conditions.

[0028] As a specific implementation, it also includes a scraper ring fixed to the outer wall of the locking ring. The outer wall of the scraper ring is in contact with the inner wall of the sleeve. The scraper ring includes a rubber ring and a fabric layer. The outer wall of the rubber ring has a fabric layer.

[0029] The above solutions address the issue that drilling fluid containing sediment is present below the piston rings, and when the sleeve moves upward relative to the upper connector, the sediment adhering to the inner wall of the sleeve can easily cause wear on the outer sealing ring of the piston rings. To address this, a scraper ring is provided on the outside of the locking ring. In this solution, the scraper ring is compressed and installed between the sleeve and the locking ring. When the drill string jumps upwards, the scraper ring can scrape off the sediment adhering to the inner wall of the sleeve, reducing the contact opportunity between the sediment and the sealing ring, thereby protecting the piston rings. Furthermore, the rubber ring is compressed to maintain the contact force between the scraper ring and the inner wall of the sleeve. The fabric layer serves as a wear-resistant layer on the surface of the scraper ring, effectively extending its service life.

[0030] As a specific implementation, an annular groove is provided on the outer wall of the locking ring, and the scraping ring is embedded in the annular groove;

[0031] The rubber ring is wrapped in a fabric layer.

[0032] In the above scheme, the annular groove is used to prevent the scraper ring on the locking ring from detaching. The scraper ring is made by wrapping a rubber ring in the fabric layer, which is a simple structure with a reliable fit between the rubber ring and the fabric layer.

[0033] As one specific implementation, the elastic element is a helical spring or a disc spring assembly comprising multiple overlapping disc springs.

[0034] The above solutions provide two specific implementation methods for elastic elements.

[0035] As a specific implementation method, it also includes a lower connector that is threaded to the lower end of the sleeve.

[0036] In the above scheme, the lower connector serves as the lower end of the damper for connecting structures such as drill bits.

[0037] As a specific implementation, the outer wall of the piston ring is provided with multiple sealing rings arranged at intervals along the piston ring axis.

[0038] In the above scheme, by setting the sealing rings to be arranged at intervals with gaps between them, when shaving abrasive particles are deposited in the lower cavity, the gaps between the sealing rings have the ability to accommodate the shaving abrasive particles, thereby effectively slowing down the wear rate of the sealing rings.

[0039] This utility model has the following beneficial effects:

[0040] In this scheme, the vibration reduction and damping effects of elastic elements and hydraulic forces can be effectively reduced to decrease the high and low frequency vibrations experienced by the drill string during operation, thereby protecting the drill string, increasing drilling machinery speed, improving wellbore quality, and reducing drilling risks. The vibration reduction and damping effects can also reduce the disturbance factors that trigger stick-slip by stabilizing drilling pressure and reducing axial vibration coupling, thus mitigating the adverse effects of stick-slip on drilling.

[0041] In this design, the liquid medium is confined within two cavities. This liquid medium not only lubricates the friction pairs at the location of the elastic element, but also prevents drilling fluid from mixing into the cavities and altering the properties of the liquid medium within the two cavities, thus ensuring hydraulic stability. For the elastic element, during its repeated deformation, any potential surface spalling is prevented by the convex ring, allowing large pieces of spalled material to be trapped above the convex ring, thus improving the sealing reliability of the piston ring location. In summary, the structural features of this design are beneficial for ensuring the reliability of the damper's performance and preventing liquid leakage within the cavities.

[0042] In this solution, by setting the liquid throttling hole on the center hole seat of the countersunk screw that is detachable relative to the convex ring, the user can install countersunk screws with different center hole diameters on the convex ring according to the current drilling location or geological characteristics of the drilling section, thereby enabling the damper to adjust the damping force according to the specific application scenario. Attached Figure Description

[0043] Figure 1 This is a structural cross-sectional view of a specific embodiment of the drill string filter hydraulic damper described in this solution;

[0044] Figure 2 for Figure 1 The diagram shows the structure of circle A.

[0045] The reference numerals in the attached figures are as follows: 1. Upper connector, 2. Top sleeve, 3. Bottom sleeve, 4. Elastic element, 5. Convex ring, 6. Inner sleeve, 7. Piston ring, 8. Locking ring, 9. Lower connector, 10. Scraper ring, 11. Through hole, 12. Countersunk screw, 13. Center hole, 14. Sealing ring. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the embodiments, but the present invention is not limited to the following embodiments:

[0047] Example 1:

[0048] like Figure 1 and Figure 2 As shown, the drill string filter hydraulic damper includes an upper connector 1 and a sleeve. The lower end of the upper connector 1 is located in the sleeve, and there is a cavity between the upper connector 1 and the sleeve. An elastic element 4 and a piston ring 7 are disposed in the cavity. The piston ring 7 is fixed at the lower end of the upper connector 1. A convex ring 5 is disposed on the inner wall of the sleeve. The lower end of the elastic element 4 is supported on the upper end surface of the convex ring 5. The upper connector 1 is supported on the upper end of the elastic element 4 by the stepped surface thereon.

[0049] The piston ring 7 is located in the cavity below the convex ring 5;

[0050] The convex ring 5 is provided with a through hole 11 connecting the upper and lower ends of the convex ring 5, and also includes a countersunk screw 12 threaded in the through hole 11, the countersunk screw 12 having a central hole 13 serving as a liquid throttling orifice.

[0051] A sealing ring 14 is provided between the inner wall of the convex ring 5 and the outer wall of the upper connector 1.

[0052] In application, this scheme connects the upper connector 1 and the lower connector 9 connected to the lower end of the sleeve in series on the drill string. In a specific application, the upper end of the upper connector 1 is connected to the lower end of the drill collar, and the lower connector 9 is connected to the drill bit. A splined joint is provided between the upper connector 1 and the sleeve. The splined joint is used to achieve the following: the upper connector 1 can transmit torque to the sleeve, so that the sleeve can rotate with the upper connector 1. At the same time, the upper connector 1 can slide relative to the sleeve in the axial direction of the sleeve. When the sliding occurs, the elastic element 4 undergoes compression deformation with different deformations, and the position of the piston ring 7 on the sleeve axis changes.

[0053] This design includes a convex ring 5, which, in conjunction with the piston ring 7, divides the cavity into an upper cavity above the convex ring 5 and a lower cavity between the convex ring 5 and the piston ring 7. The elastic element 4 is located in the upper cavity. During use, both the upper and lower cavities are filled with a liquid medium, such as silicone oil. When the drill string vibrates axially, the central hole 13 acts as a liquid throttling hole connecting the upper and lower cavities. For example, when the drill string jumps upward, the sleeve moves upward relative to the upper connector 1, the elastic element 4 is further compressed, the length of the lower cavity increases, and the liquid in the upper cavity flows to the lower cavity through the central hole 13. During this process, this damper isolates vibration and dissipates energy through hydraulic and elastic forces. After the upward jump stops, the elastic element 4 rebounds, forcing the sleeve to move downward relative to the upper connector 1, and the liquid in the lower cavity is squeezed into the upper cavity through the central hole 13.

[0054] Unlike existing technologies, this solution uses a convex ring 5 and a piston ring 7 to divide the cavity into two spaces. The liquid medium is confined within the two cavities and flows between them according to the drill pipe's movement. This not only lubricates the friction pair at the location of the elastic element 4, but also prevents drilling fluid from mixing into the cavities and altering the properties of the liquid medium within the two cavities. Furthermore, the elastic element 4 is positioned above the convex ring 5. Thus, during repeated deformation of the elastic element 4 (especially when using a disc spring), any potential surface spalling is prevented by the convex ring 5, allowing large pieces of spalling material to be retained above it. Even when the axial seal at the sealing ring 14 fails due to wear caused by surface spalling, altering the hydraulic damping characteristics of the damper, the elastic element 4 can still... Providing stable vibration reduction and damping, the fit between the piston ring 7 and the sleeve is used to prevent liquid leakage in the lower cavity. Therefore, from the perspective of hydraulic stability and sealing reliability, the structural features of this solution are beneficial to ensuring the reliability of the damper and avoiding liquid leakage in the cavity. At the same time, by setting the liquid throttling hole on the center hole 13 of the countersunk screw 12 that is removable relative to the convex ring 5, the user can install countersunk screws 12 with different center hole diameters 13 on the convex ring 5 according to the current drilling location or geological characteristics of the drilling section. For example, a larger diameter center hole 13 makes the damper have a smaller damping force and stiffness, while a smaller diameter center hole 13 makes the damper have a larger damping force and stiffness, thereby enabling the damper to adjust the damping force according to the specific application scenario.

[0055] Example 2:

[0056] This embodiment follows immediately after Embodiment 1 and provides a more detailed solution.

[0057] The sleeve includes a top sleeve 2 and a bottom sleeve 3, with the lower end of the top sleeve 2 threadedly connected to the upper end of the bottom sleeve 3.

[0058] The upper connector 1 passes through the top sleeve 2, and the lower end of the upper connector 1 extends into the bottom sleeve 3;

[0059] A spline for transmitting torque is provided between the upper connector 1 and the top sleeve 2;

[0060] The elastic element 4 and the piston ring 7 are both disposed in the cavity between the bottom sleeve 3 and the upper connector 1.

[0061] In this embodiment, the sleeve is configured to include a top sleeve 2 and a bottom sleeve 3. The top sleeve 2 serves as the upper part of the sleeve and is used to achieve a spline connection with the upper connector 1. The bottom sleeve 3 serves as the part of the sleeve that houses the elastic element 4 and the piston ring 7 between the upper connector 1 and the sleeve. This structure not only facilitates the assembly of various components, but also allows the top sleeve 2 and the bottom sleeve 3 to be machined separately. Since the top sleeve 2 needs to be machined with a spline groove (the connector section of the upper connector 1 is machined as a spline shaft), it uses a thicker blank than the bottom sleeve 3, while the bottom sleeve 3 uses a thinner blank. This method saves raw materials compared to using an integral sleeve. Furthermore, after machining is completed, the spline groove surface and the contact position of the elastic element 4 on the sleeve need to be treated for wear resistance. By setting the sleeve to have two short sections, higher machining accuracy can be obtained while facilitating the surface wear resistance treatment of the corresponding inner wall surfaces.

[0062] Example 3:

[0063] This embodiment follows immediately after Embodiment 1 and provides a more detailed solution.

[0064] The upper connector 1 includes a connector cylindrical section and an inner sleeve 6, the upper end of which is threadedly connected to the lower end of the connector cylindrical section.

[0065] The structure on the upper connector 1 that forms a spline fit with the top sleeve 2 is located on the connector sleeve section. The mating position of the sealing ring 14 on the upper connector 1 is located on the inner sleeve 6. The piston ring 7 is fixed to the lower end of the inner sleeve 6.

[0066] In this embodiment, the connector section is the upper section of the upper connector 1, and the inner section is the lower section of the upper connector 1. Similar to the above sleeve structure, the blank of the inner sleeve 6 does not need to be machined into the spline shaft section and the upper connector. Therefore, from the perspective of material consumption, the inner sleeve 6 can use a thinner blank (this problem does not exist if the upper connector 1 is made into a forging as a whole). On the other hand, since the outer diameter accuracy and coaxiality of the inner section affect whether the elastic element 4 is uniformly stressed in all circumferential positions and the reliable sealing life of the piston ring 7, compared with the integral upper connector 1, the above segmented upper connector 1 can be machined in segments, which is beneficial to ensuring the overall coaxiality of the upper connector 1 and the machining accuracy of key positions.

[0067] Example 4:

[0068] This embodiment follows immediately after Embodiment 1 and provides a more detailed solution.

[0069] The number of through holes 11 is multiple, and the through holes 11 are arranged at intervals in the circumferential direction of the convex ring 5;

[0070] Each through hole 11 is provided with a countersunk screw 12, and each countersunk screw 12 is provided with a center hole 13;

[0071] The countersunk screw 12 is an internal hexagon screw with an internal hexagonal hole at the nut end, and the upper end of the center hole 13 is connected to the internal hexagonal hole.

[0072] In this embodiment, the use of multiple through holes 11 not only solves the problem of radial vibration of the drill string caused by the offset of the center of gravity of the convex ring 5 relative to its axis, but also makes the pressure distribution and temperature distribution of the liquid medium more uniform in the circumferential direction of the upper and lower cavities during the hydraulic damping process, thus avoiding the problems of uneven lateral force and circumferential temperature distribution caused by this solution; the use of countersunk screws 12 is to allow the countersunk screws 12 to be installed on the convex ring 5, so as to avoid the convex ring 5 affecting the stable support of the elastic element 4.

[0073] Example 5:

[0074] This embodiment follows immediately after Embodiment 1 and provides a more detailed solution.

[0075] The piston ring 7 is threaded to the upper connector 1 through its inner threaded hole, and also includes a locking ring 8 threaded to the upper connector 1 with its upper end face abutting the lower end face of the piston ring 7.

[0076] In this embodiment, the piston ring 7, which is threadedly connected to the upper connector 1, allows the piston ring 7 to be replaced as a wear part, which helps to reduce the cost of using this damper. The locking ring 8 is used to prevent the piston ring 7 from loosening, further improving the reliability of this damper under vibration conditions.

[0077] It also includes a scraper ring 10 fixed to the outer wall of the locking ring 8. The outer wall of the scraper ring 10 is in contact with the inner wall of the sleeve. The scraper ring 10 includes a rubber ring and a fabric layer. The outer wall of the rubber ring has a fabric layer.

[0078] In this embodiment, addressing the issue that drilling fluid containing silt is present below the piston ring 7, and that the silt adhering to the inner wall of the sleeve can easily cause wear on the outer sealing ring of the piston ring 7 when the sleeve moves upward relative to the upper connector 1, a solution is provided to install a scraper ring 10 on the outside of the locking ring 8. In this solution, the scraper ring 10 is squeezed and installed between the sleeve and the locking ring 8. When the drill string jumps upward, the scraper ring 10 can scrape off the silt adhering to the inner wall of the sleeve, reducing the contact opportunity between the silt and the sealing ring, thereby achieving the purpose of protecting the piston ring 7. Furthermore, the rubber ring is compressed to maintain the contact force between the scraper ring 10 and the inner wall of the sleeve, and the fabric layer serves as a wear-resistant layer on the surface of the scraper ring 10, which can effectively extend the service life of the scraper ring 10.

[0079] An annular groove is provided on the outer wall of the locking ring 8, and the scraping ring 10 is embedded in the annular groove;

[0080] The rubber ring is wrapped in a fabric layer.

[0081] In this embodiment, the annular groove is used to prevent the scraper ring 10 on the locking ring 8 from falling off. The scraper ring 10 is made by wrapping a rubber ring in the fabric layer, which is a simple structure with a reliable fit between the rubber ring and the fabric layer.

[0082] Example 6:

[0083] This embodiment follows immediately after Embodiment 1 and provides a more detailed solution.

[0084] The elastic element 4 is a helical spring or a disc spring assembly comprising multiple overlapping disc springs.

[0085] This embodiment provides two specific implementation methods for the elastic element 4.

[0086] Example 7:

[0087] This embodiment follows immediately after Embodiment 1 and provides a more detailed solution.

[0088] It also includes a lower connector 9 that is threaded to the lower end of the sleeve.

[0089] In this embodiment, the lower connector 9 serves as the lower end of the damper for connecting structures such as drill bits.

[0090] Example 8:

[0091] This embodiment follows immediately after Embodiment 1 and provides a more detailed solution.

[0092] The outer wall of the piston ring 7 is provided with a plurality of sealing rings arranged at intervals along the axis of the piston ring 7.

[0093] In this embodiment, by setting the sealing rings to be spaced apart with gaps, when shaving abrasive particles are deposited in the lower cavity, the gaps between the sealing rings have the ability to accommodate the shaving abrasive particles, thereby effectively slowing down the wear rate of the sealing rings.

[0094] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, other embodiments derived without departing from the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A drill string filter hydraulic damper, comprising an upper connector (1) and a sleeve, wherein the lower end of the upper connector (1) is located in the sleeve, and a cavity exists between the upper connector (1) and the sleeve, wherein an elastic element (4) and a piston ring (7) are disposed in the cavity, and the piston ring (7) is fixed at the end position of the lower end of the upper connector (1), characterized in that, The inner wall of the sleeve is provided with a protruding ring (5), the lower end of the elastic element (4) is supported on the upper end surface of the protruding ring (5), and the upper connector (1) is supported on the upper end of the elastic element (4) through the stepped surface thereon. The piston ring (7) is located in the cavity below the convex ring (5); The convex ring (5) is provided with a through hole (11) connecting the upper and lower ends of the convex ring (5), and also includes a countersunk screw (12) threaded in the through hole (11), the countersunk screw (12) having a central hole (13) serving as a liquid throttling orifice; A sealing ring (14) is provided between the inner wall of the convex ring (5) and the outer wall of the upper connector (1).

2. The drill tool filter hydraulic damper of claim 1, wherein, The sleeve includes a top sleeve (2) and a bottom sleeve (3), with the lower end of the top sleeve (2) threadedly connected to the upper end of the bottom sleeve (3). The upper connector (1) passes through the top sleeve (2), and the lower end of the upper connector (1) extends into the bottom sleeve (3); A spline for transmitting torque is provided between the upper connector (1) and the top sleeve (2); The elastic element (4) and the piston ring (7) are both disposed in the cavity between the bottom sleeve (3) and the upper connector (1).

3. The drill tool filter hydraulic damper of claim 1 or 2, wherein, The upper connector (1) includes a connector cylinder section and an inner sleeve (6), the upper end of which is threadedly connected to the lower end of the connector cylinder section; The structure on the upper connector (1) for forming a spline fit with the top sleeve (2) is located on the connector tube section. The mating position of the sealing ring (14) on the upper connector (1) is located on the inner sleeve (6). The piston ring (7) is fixed to the lower end of the inner sleeve (6).

4. The drill tool filter hydraulic damper of claim 1, wherein, The number of through holes (11) is multiple, and the through holes (11) are arranged at intervals in the circumferential direction of the convex ring (5); Each through hole (11) is provided with a countersunk screw (12), and each countersunk screw (12) is provided with a center hole (13); The countersunk screw (12) is an internal hexagonal screw with an internal hexagonal hole at the nut end, and the upper end of the center hole (13) is connected to the internal hexagonal hole.

5. The drill tool filter hydraulic damper of claim 1, wherein, The piston ring (7) is threaded to the upper connector (1) through its inner threaded hole, and also includes a locking ring (8) threaded to the upper connector (1) with its upper end face in contact with the lower end face of the piston ring (7).

6. The drill tool filter hydraulic damper of claim 5, wherein, It also includes a scraper ring (10) fixed on the outer wall of the locking ring (8), the outer wall of the scraper ring (10) being in contact with the inner wall of the sleeve, the scraper ring (10) comprising a rubber ring and a fabric layer, the outer wall of the rubber ring having a fabric layer.

7. The drill tool filter hydraulic damper of claim 6, wherein, The outer wall of the locking ring (8) is provided with an annular groove, and the scraping ring (10) is embedded in the annular groove; The rubber ring is wrapped in a fabric layer.

8. The drill tool filter hydraulic damper of claim 1, wherein, The elastic element is a helical spring or a disc spring assembly comprising multiple overlapping disc springs.

9. The drill tool filter hydraulic damper of claim 1, wherein, It also includes a lower connector (9) that is threaded to the lower end of the sleeve.

10. The drill tool filter hydraulic damper of claim 1, wherein, The outer wall of the piston ring (7) is provided with a plurality of sealing rings arranged at intervals along the axis of the piston ring (7).

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