A general-purpose rubber cartridge testing fixture and testing method

Abstract

This invention discloses a universal rubber tube testing fixture and method, comprising an inner tube, a piston, an outer tube, and a stop. The inner tube includes a central tube, a mandrel, and a lower connector. A first pressure-transmitting hole is provided at the end of the central tube away from the mandrel. The piston is slidably sleeved on the outer wall of the central tube and communicates with the first pressure-transmitting hole. The outer tube is sleeved on the outer wall of the mandrel and forms a test cavity with the piston and the lower connector. A pair of second pressure-transmitting holes are provided on the outer tube at both ends of the test cavity. The first pressure-transmitting hole enables a hydraulically driven sealing method, which enhances the sealing performance of the fixture. The stop allows the device to simulate two compression methods. The second pressure-transmitting holes allow the pressure-bearing performance of the rubber tube to be tested even after the rubber tube is sealed, by applying pressure to the second pressure-transmitting holes. In summary, this invention effectively improves the accuracy of the rubber tube test results.

Description

Technical Field

[0001] This invention relates to the field of downhole tools technology for oil and gas field development, specifically to a universal rubber sleeve testing fixture and testing method. Background Technology

[0002] In the field of oil extraction, packer seals play a crucial role in downhole tools. However, due to complex geological conditions, downhole environments exhibit varying formation pressures, temperatures, and rock properties. For example, in deep oil wells, formation pressures can exceed 100 MPa, and temperatures can reach around 200°C. In such environments, packers must withstand immense external pressure while maintaining excellent sealing performance to prevent well fluid leakage. Therefore, packers require performance testing before use. For instance, application publication number CN117968974A, entitled "An Experimental Device for Testing the Sealing Performance of Packer Packers and Its Usage Method," includes simulated sealing... The packer device and the first pressurization system are connected to the first end of the simulated packer device via the first pressurization tubing to pressurize the simulated packer device so that it can perform a sealing function. The second pressurization system is connected to the second end of the simulated packer device via the second pressurization tubing to pressurize the simulated packer device to test its sealing performance. The vibration loading system is connected to the first pressurization tubing to apply vibration to the simulated packer device to input a variable load. The monitoring system is installed on the simulated packer device to monitor the pressure and temperature inside the simulated packer device in real time.

[0003] However, the aforementioned rubber sleeve sealing performance testing device can only test and analyze a single type of rubber sleeve or rubber sleeves with similar sizes. For rubber sleeves with significantly different models, the testing fixture needs to be redesigned and manufactured, which undoubtedly increases the production cycle and cost. Furthermore, the mechanical drive mechanism of the aforementioned rubber sleeve sealing performance testing device limits the heating method, requiring methods such as external insulation wrapping and constant temperature chambers to simulate the downhole temperature environment. This results in high heat transfer loss and cannot reach the high-temperature resistance limit of high-grade rubber sleeves. As oil exploration and development extend to deeper and more complex formations, most downhole packers are now hydraulic packers, and the mechanical drive mechanism of the aforementioned rubber sleeve sealing performance testing device cannot accurately reflect the actual deformation and expansion of the rubber sleeve. In conclusion, the accuracy of the rubber sleeve testing results obtained by the aforementioned rubber sleeve sealing performance testing device needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a universal rubber tube testing fixture and testing method to solve the technical problem of inaccurate rubber tube testing results in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This invention provides a universal rubber cartridge testing fixture and testing method, including:

[0007] The inner tube includes a central tube, a mandrel, and a lower connector, which are connected in sequence. The outer diameter of the lower connector is larger than the outer diameter of the mandrel. A first pressure transmission hole is provided at the end of the central tube away from the mandrel.

[0008] A piston, which is slidably sleeved on the outer wall of the central tube and communicates with the first pressure transmission hole;

[0009] An outer tube, sleeved on the outer wall of the mandrel, forming a test cavity with the piston and the lower connector; the outer tube has a pair of second pressure-transmitting holes located at both ends of the test cavity; and

[0010] A stopper is used to securely connect the lower connector and the outer tube.

[0011] In some embodiments, the outer tube includes a coupling, a seat seal, and a sleeve. The two couplings are respectively fitted onto the outer wall of the piston and the outer wall of the lower connector. The seat seal is fitted between the two couplings. The sleeve is fitted onto the outer wall of the seat seal, and both ends of the sleeve are fixedly connected to the two couplings respectively.

[0012] In some embodiments, the stop member includes a stop sleeve and a connecting sleeve, the stop sleeve and the connecting sleeve being snapped together, and the stop sleeve and the connecting sleeve being threadedly connected to the coupling and the lower connector, respectively.

[0013] In some embodiments, the piston is connected to a check valve in the direction of the test cavity. The check valve includes a locking ring seat, a locking ring, and an internal hexagonal head screw. The locking ring seat and the locking ring are fixedly connected by the internal hexagonal head screw. The locking ring is sleeved on the outer wall of the central tube, and the inner wall of the locking ring engages unidirectionally with the outer wall of the central tube.

[0014] In some embodiments, the locking ring seat is sleeved on the outer wall of the locking ring, and the locking ring and the locking ring seat engage in one direction only.

[0015] In some embodiments, the check valve is provided with an upper guide ring sleeve in the direction of the test cavity.

[0016] In some embodiments, the lower connector is provided with a lower guide ring sleeve in the direction of the test cavity.

[0017] In some embodiments, tooling guide rings are provided at the opposite ends of the upper guide ring sleeve and the lower guide ring sleeve.

[0018] In some embodiments, a shear pin is provided between the piston and the central tube.

[0019] In some embodiments, including:

[0020] S1. The rubber sleeve to be tested is fitted onto the mandrel;

[0021] S2. Install the center tube, lower connector, piston, and outer tube in sequence;

[0022] S3. The entire device is heated by oil immersion;

[0023] S4. Pressurize the first pressure transmission hole to make the liquid / or gas drive piston and the lower connector move towards each other, squeezing the rubber tube and simulating a seal;

[0024] S5. After stabilizing the pressure for the specified time, pressurize the second pressure transmission hole to further test the pressure-bearing performance of the rubber sleeve.

[0025] Compared with the prior art, the present invention provides a general-purpose rubber sleeve testing fixture and testing method. On the one hand, by setting the first pressure transmission hole, a hydraulic driving setting method is realized, which is more realistic than the mechanical driving setting method.

[0026] Secondly, the hydraulic drive setting method, compared with the mechanical drive setting method, makes the tooling more effective in sealing, thus making it suitable for oil immersion heating.

[0027] Secondly, by setting the stop, the device can simulate two extrusion methods (bidirectional extrusion and unidirectional extrusion).

[0028] Fourthly, by setting the second pressure transmission hole, the pressure-bearing performance of the rubber tube can still be tested by pressing the second pressure transmission hole after the rubber tube is set.

[0029] In five aspects, the segmented design of the inner tube allows the device to replace different spindles according to different rubber sleeves;

[0030] In summary, this tooling effectively improves the accuracy of the test results for the rubber tube. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a general-purpose rubber sleeve testing fixture and testing method provided in an embodiment of the present invention. Figure 1 (Double-sided extrusion rubber cylinder);

[0032] Figure 2 This is a schematic diagram of the structure of a general-purpose rubber sleeve testing fixture and testing method provided in an embodiment of the present invention. Figure 2 (Single-sided extrusion tube).

[0033] Explanation of reference numerals in the attached drawings: 1. Inner tube; 11. Central tube; 111. First pressure transmission hole; 12. Mandrel; 13. Lower connector; 2. Piston; 21. Shear pin; 3. Outer tube; 31. Coupling; 32. Sealing sleeve; 33. Sleeve; 331. Second pressure transmission hole; 4. Test cavity; 5. Stop; 51. Stop sleeve; 52. Connecting sleeve; 6. Check valve; 61. Locking ring seat; 62. Locking ring; 63. Socket head cap screw; 7. Upper guide ring sleeve; 8. Lower guide ring sleeve; 9. Tooling guide ring. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the invention and are not intended to limit the invention.

[0035] To address the technical problem of inaccurate glue cartridge test results, this invention provides a universal glue cartridge testing fixture and method, which can improve the accuracy of glue cartridge testing.

[0036] It should be noted that the universal rubber tube testing fixture and testing method described in this invention are applicable to, but not limited to, rubber tubes, etc. For ease of explanation, this invention only uses the application of a universal rubber tube testing fixture and testing method to rubber tubes as an example for illustration. The principle of applying a universal rubber tube testing fixture and testing method to other types of equipment is essentially the same as the principle applied to rubber tubes, and will not be elaborated here.

[0037] Please see Figure 1 - Figure 2 ,in Figure 1 This is a schematic diagram of a general-purpose rubber tube testing fixture and testing method according to an embodiment of the present invention. The general-purpose rubber tube testing fixture includes an inner tube 1, a piston 2, an outer tube 3, and a stop 5. The inner tube 1 includes a central tube 11, a mandrel 12, and a lower connector 13. The central tube 11, mandrel 12, and lower connector 13 are connected in sequence. The outer diameter of the lower connector 13 is larger than the outer diameter of the mandrel 12. A first pressure transmission hole 111 is opened at the end of the central tube 11 away from the mandrel 12. The piston 2 is slidably sleeved on the outer wall of the central tube 11 and communicates with the first pressure transmission hole 111. The outer tube 3 is sleeved on the outer wall of the mandrel 12 and forms a test cavity 4 with the piston 2 and the lower connector 13. The outer tube 3 has a pair of second pressure transmission holes 331 and is located at both ends of the test cavity 4. The stop 5 is used to fix the lower connector 13 and the outer tube 3.

[0038] In this embodiment, on the one hand, the hydraulic drive setting method is realized by setting the first pressure transmission hole 111, which is more realistic than the mechanical drive setting method;

[0039] Secondly, the hydraulic drive setting method, compared with the mechanical drive setting method, makes the tooling more effective in sealing, thus making it suitable for oil immersion heating.

[0040] Secondly, by setting the stop 5, the device can simulate two extrusion methods (bidirectional extrusion and unidirectional extrusion).

[0041] Fourthly, by setting the second pressure transmission hole 331, the pressure bearing performance of the rubber tube can still be tested by pressing the second pressure transmission hole 331 after the rubber tube is set.

[0042] In five aspects, the segmented design of the inner tube 1 enables the device to replace different spindles 12 according to different rubber sleeves;

[0043] In summary, this tooling effectively improves the accuracy of the test results for the rubber tube.

[0044] Specifically, the rubber sleeve is installed in the test cavity 4. The downhole temperature simulation is performed by immersing the entire rubber sleeve test fixture in high-temperature oil. The hydraulic pressure and oil temperature are adjusted according to the required pressure and temperature levels for the test. The downhole pressure simulation is performed by pressurizing through the first pressure transmission hole 111 of the central tube 11, causing the liquid / or gas to drive the piston 2. When the pressure reaches the starting pressure, the piston 2 moves downward, squeezing the rubber sleeve. The rubber sleeve expands to simulate the sealing process. After stabilizing the pressure for a specified time, the rubber sleeve can be removed from the test fixture to analyze the compression state of the rubber sleeve, or gas / liquid pressure can be applied directly from the second pressure transmission hole 331 to test the pressure-bearing performance of the rubber sleeve.

[0045] Furthermore, the test fixture is designed with a central tube 11 featuring a first pressure transmission hole 111. By using pneumatic / hydraulic pressurization to simulate the downhole environment, it avoids situations where the local pressure is too high or too low. This ensures that the external force on the rubber sleeve is uniform, and its deformation and fit with surrounding components during the pressurization process are generated under balanced stress. This more accurately reflects the mechanical properties and sealing characteristics of the rubber sleeve itself, helping to accurately assess the quality and applicability of the rubber sleeve. The oil immersion heating method utilizes the excellent thermal conductivity of oil, and the maximum simulated temperature can reach over 200℃. At the same time, it allows all parts of the rubber sleeve test fixture to be heated evenly during the heating process. The oil can evenly transfer heat to the surface and interior of the rubber sleeve, avoiding local overheating or excessive temperature differences.

[0046] Furthermore, this rubber tube testing fixture can withstand a high temperature of 232℃ and an environment of 15000PSI (103.5Mpa), ensuring that the stress and heat conditions of the rubber tube during testing closely match those under actual use. This accurately reflects the performance of the high-strength rubber tube and provides a favorable basis for evaluating the reliability of the high-strength rubber tube under actual working conditions.

[0047] In one embodiment, please refer to Figure 1 The outer tube 3 includes a pair of couplings 31, a seated sleeve 32, and a sleeve 33. The two couplings 31 are respectively fitted on the outer wall of the piston 2 and the outer wall of the lower connector 13. The seated sleeve 32 is fitted between the two couplings 31. The sleeve 33 is fitted on the outer wall of the seated sleeve 32, and both ends of the sleeve 33 are fixedly connected to the two couplings 31 respectively.

[0048] In this embodiment, a suitable setting sleeve 32 is selected according to the different diameters of the rubber tubes, so that the device can be applied to more rubber tubes of different sizes. When the setting sleeve 32 cannot meet the setting range of the rubber tube, the setting sleeve 32 can be removed, so that the rubber tube can be directly set on the inner wall of the sleeve 33.

[0049] Furthermore, this testing fixture is applicable to all universal rubber cartridges ranging from 4.5 inches to 9.5 inches. When testing multiple sizes of rubber cartridges, there is no need to frequently change testing equipment, reducing the time for fixture preparation and replacement, greatly improving the overall efficiency of testing, and reducing the production cost and cycle of testing.

[0050] In one embodiment, please refer to Figure 2 The stop element 5 includes a stop sleeve 51 and a connecting sleeve 52. The stop sleeve 51 and the connecting sleeve 52 are interlocked, and the stop sleeve 51 and the connecting sleeve 52 are threadedly connected to the coupling 31 and the lower connector 13, respectively.

[0051] In this embodiment, when it is necessary to squeeze the rubber cylinder on one side, a stopper 5 is installed, that is, the stopper sleeve 51 is threadedly fixed to the coupling 31, the connecting sleeve 52 is threadedly fixed to the lower connector 13, and the connecting sleeve 52 is snapped between the coupling 31 and the stopper sleeve 51, so that the lower connector 13 is fixedly connected to the coupling 31. Thus, during the setting process, the central tube 11 cannot move under the restriction of the lower connector 13, thereby realizing the squeezing of the rubber cylinder on one side.

[0052] In one embodiment, please refer to Figure 1 The piston 2 is connected to a check valve 6 in the direction of the test cavity 4. The check valve 6 includes a locking ring seat 61, a locking ring 62 and an internal hexagonal head screw 63. The locking ring seat 61 and the locking ring 62 are fixedly connected by the internal hexagonal head screw 63. The locking ring 62 is sleeved on the outer wall of the central tube 11, and the inner wall of the locking ring 62 engages unidirectionally with the outer wall of the central tube 11.

[0053] In this embodiment, the locking ring seat 61 is connected to the piston 2 by a thread, and the locking ring 62 is a C-shaped ring structure with a unidirectional tooth shape. During the setting process of the rubber tube, the relative force trend of the locking ring 62 and the locking ring seat 61 is forward tooth meshing and movable. After the rubber tube is set, the relative force trend of the locking ring 62 and the central tube 11 is reverse tooth meshing, which can maintain the setting force and ensure the sealing and anchoring effect.

[0054] In one embodiment, please refer to Figure 1 The locking ring seat 61 is sleeved on the outer wall of the locking ring 62, and the locking ring 62 and the locking ring seat 61 engage in one direction.

[0055] In this embodiment, the locking ring seat 61 and the locking ring 62 are engaged by a one-way sawtooth thread, which makes the thrust transmitted from the locking ring seat 61 to the locking ring 62 more uniform and avoids damage to the check valve 6 caused by only the internal hexagonal head screw 63 transmitting the thrust.

[0056] In one embodiment, please refer to Figure 1 The check valve 6 is provided with an upper guide ring sleeve 7 facing the test cavity 4.

[0057] In this embodiment, the upper guide ring sleeve 7 is used to adjust the length between the piston 2 and the rubber tube. Depending on the length of the rubber tube, the upper guide ring sleeve 7 of different lengths can be replaced, thereby making the device applicable to rubber tubes of different specifications and improving the versatility of the device.

[0058] In one embodiment, please refer to Figure 1 The lower connector 13 is provided with a lower guide ring sleeve 8 facing the test cavity 4.

[0059] In this embodiment, the lower guide ring sleeve 8 has a reversing function, which facilitates disassembly and assembly.

[0060] In one embodiment, please refer to Figure 2 The upper guide ring sleeve 7 and the lower guide ring sleeve 8 are both provided with tooling guide rings 9 at their opposite ends.

[0061] In this embodiment, the tooling guide ring 9 is used to better fit the rubber tube and improve the extrusion effect of the rubber tube.

[0062] In one embodiment, please refer to Figure 1 A shear pin 21 is provided between the piston 2 and the central tube 11.

[0063] Furthermore, a large number of double O-rings and back rings are used to ensure that no leakage occurs during the rubber sleeve test. Specifically, the O-rings and back rings seal the piston chamber 2, the upper annulus of the rubber sleeve, the lower annulus of the rubber sleeve, and the center tube 11. Compared with a single O-ring and back ring seal, this can better prevent leakage during the pressurization process. The double O-ring and back ring seal structure can provide a stable and reliable sealing effect under different pressure and temperature conditions, reducing the occurrence of test interruptions or inaccurate data due to sealing problems. This improves the overall reliability and stability of the test fixture and provides a strong guarantee for the performance evaluation of downhole rubber sleeves.

[0064] In this embodiment, the shear pin 21 is used to simulate the sealing process in a real scenario. When pressure is applied to the first pressure transmission hole 111 to the starting pressure, the shear pin 21 is sheared, and the piston 2 can then move toward the rubber cylinder.

[0065] In one embodiment, please refer to Figure 1 - Figure 2 ,

[0066] S1. The rubber sleeve to be tested is fitted onto the mandrel 12;

[0067] S2. Install the central tube 11, lower connector 13, piston 2 and outer tube 3 in sequence;

[0068] S3. The entire device is heated by oil immersion;

[0069] S4. Pressurize the first pressure transmission hole 111 to make the liquid / or gas drive piston 2 and lower connector 13 move towards each other, squeeze the rubber tube, and simulate sealing.

[0070] S5. After stabilizing the pressure for the specified time, pressurize the second pressure transmission hole 331 to further test the pressure-bearing performance of the rubber tube.

[0071] Furthermore, this testing fixture can simulate various stress conditions of the packer sleeve in downhole applications. In complex downhole environments, the sleeve may face compressive forces from one side, such as in asymmetrical installation environments where only one side of the sleeve is in compressive contact with other components. It can also experience compression from both sides, as seen in symmetrically installed downhole tools subjected to external forces on both sides. This testing fixture can simulate these two different compression states, making the performance testing of the sleeve more closely resemble the diverse stress conditions encountered in actual use. This allows for a more comprehensive and accurate understanding of key indicators such as the sleeve's pressure-bearing capacity, sealing performance, and deformation under different stress conditions, avoiding the oversight of potential problems under other stress conditions by only testing a single compression state.

[0072] To better understand this invention, the following is combined with... Figures 1 to 2 The technical solution of the present invention will be described in detail below:

[0073] The pressure is applied from both sides into the first pressure transmission hole 111 of the central tube 11. The pressure enters the piston 2 through the first pressure transmission hole 111 of the central tube 11. When the pressure reaches the starting pressure, the shear pin 21 is sheared, and the rubber sleeve test fixture sets and starts. The piston 2 moves downward under the pressure. When there is no constraint at the lower end, that is, the stop 5 is not connected, the central tube 11 moves upward and drives the spindle 12 and the lower connector 13 to move upward together. The upper end face of the lower connector 13 is in contact with the lower end face of the lower guide ring sleeve 8. Therefore, during the upward movement, the lower connector 13 pushes the lower guide ring sleeve 8 to move upward as well. Similarly, the upper end face of the lower guide ring sleeve 8 is in contact with the lower end face of the fixture guide ring 9. Therefore, during the upward movement, the lower guide ring sleeve 8 pushes the fixture guide ring 9 to move upward as well.

[0074] When the locking ring seat 61 moves downward, it meshes with the locking ring 62 in a clockwise direction. The lower end face of the locking ring seat 61 is in contact with the upper end face of the upper guide ring sleeve 7. Therefore, during the downward displacement, the locking ring seat 61 pushes the upper guide ring sleeve 7 to move downward as well. Similarly, the lower end face of the upper guide ring sleeve 7 is in contact with the upper end face of the tooling guide ring 9. Therefore, during the downward displacement, the upper guide ring sleeve 7 pushes the tooling guide ring 9 to move downward as well.

[0075] Therefore, when there is no constraint at the lower end, the rubber tube is subjected to pressure and compression in a uniform way on both sides. The tooling guide rings 9 on both sides of the rubber tube are connected to the back ring outside the rubber tube assembly under test through threads. The rubber tube under test is subjected to pressure and compression, gradually expands and fits tightly against the setting sleeve 32, thus completing the setting test.

[0076] When a fixed constraint is applied at the lower end, the two components, the stop sleeve 51 and the connecting sleeve 52, are connected and tightened to the coupling 31 and the lower connector 13 respectively through threads, so that the lower connector 13 is fixedly connected to the coupling 31 and the inner tube 1 cannot move. As a result, the stress state of the tested rubber tube assembly becomes one-way compression from the upper side.

[0077] Whether it is double-sided or single-sided extrusion, after the test, the test fixture has no redundant structure and is easy to disassemble. After removing external parts such as the seat sleeve 32 and coupling 31, the entire rubber cylinder can be directly removed for compression analysis. This eliminates the need to spend a lot of time on complex disassembly operations, thus effectively shortening the test time of a single rubber cylinder. This can significantly improve the overall test efficiency and accelerate the progress of R&D, production, or quality inspection. The completely removable rubber cylinder can maintain its original shape, size, and performance state after the test, without damaging the intact state of the rubber cylinder after the experiment. This allows testers to accurately observe and measure various parameters of the rubber cylinder after compression, such as deformation and wear, thereby obtaining more accurate and reliable test data and providing a strong basis for evaluating the compression performance and quality of the rubber cylinder.

[0078] Additionally, two second pressure transmission holes 331 are provided on the sleeve 33, allowing for different levels of pressure resistance performance testing of the rubber sleeve by applying gas / liquid pressure.

[0079] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A universal barrel test fixture, characterized by, The device comprises an inner tube, a piston, an outer tube and a stopper.

2. A universal barrel test fixture according to claim 1, wherein, The inner tube comprises a center tube, a mandrel and a lower joint, which are connected in sequence, the outer diameter of the lower joint is larger than that of the mandrel, and the center tube is provided with a first pressure transmission hole at the end away from the mandrel.

3. A universal barrel test fixture according to claim 2, wherein, The piston is slidably sleeved on the outer wall of the center tube and communicates with the first pressure transmission hole.

4. The universal barrel test fixture of claim 1, wherein, The outer tube is sleeved on the outer wall of the mandrel and surrounds the piston and the lower joint to form a test cavity, and is provided with a pair of second pressure transmission holes at both ends of the test cavity.

5. A universal barrel test fixture as defined in claim 4, wherein, The stopper is in a disengaged state of being not connected between the lower joint and the outer tube, and makes the piston move downward under the push of pressure.

6. A universal barrel test fixture as defined in claim 4, wherein, The center tube moves upward and drives the mandrel and the lower joint to move upward and connect between the lower joint and the outer tube.

7. A universal barrel test fixture according to claim 6, wherein, The outer tube comprises a pair of connectors, a setting sleeve and a sleeve, the connectors are respectively sleeved on the outer wall of the piston and the outer wall of the lower joint, the setting sleeve is sleeved between the connectors, and the sleeve is sleeved on the outer wall of the setting sleeve and fixedly connected with the connectors at both ends.

8. A universal barrel test fixture according to claim 7, wherein, The stopper comprises a stop sleeve and a connecting sleeve, which are interlocked, and the stop sleeve and the connecting sleeve are respectively threadedly connected with the connectors and the lower joint.

9. The universal barrel test fixture of claim 1, wherein, The piston is connected with a check element in the direction of the test cavity, the check element comprises a lock ring seat, a lock ring and an internal hexagonal cylindrical head screw, the lock ring seat and the lock ring are fixedly connected by the internal hexagonal cylindrical head screw, the lock ring is sleeved on the outer wall of the center tube, and the inner wall of the lock ring is one-way engaged with the outer wall of the center tube.

10. The method of claim 1 to 9, wherein, The lock ring seat is sleeved on the outer wall of the lock ring, and the lock ring is one-way engaged with the lock ring seat. The check element is provided with an upper guide ring sleeve in the direction of the test cavity. The lower joint is provided with a lower guide ring sleeve in the direction of the test cavity. The opposite ends of the upper guide ring sleeve and the lower guide ring sleeve are provided with tool guide rings. The piston and the center tube are provided with a shear pin. When the stopper is in the disengaged state, S1. The to-be-tested rubber sleeve is sleeved on the mandrel; S2. The center tube, the lower joint, the piston and the outer tube are installed in sequence; S3. The whole device is immersed in oil and heated; S4. The first pressure transmission hole is pressed to make the liquid / gas drive the piston and the lower joint to move towards each other, extrude the rubber sleeve and simulate the sealing; S5. After a specified time of pressure stabilization, the second pressure transmission hole is pressed to further test the pressure bearing performance of the rubber sleeve. When the stopper is in the installed state, S1. The to-be-tested rubber sleeve is sleeved on the mandrel; S2. The center tube, the lower joint, the piston and the outer tube are installed in sequence; S3. The whole device is immersed in oil and heated; S4. The first pressure transmission hole is pressed to make the liquid / gas drive the piston to move one-way, extrude the rubber sleeve and simulate the sealing; S5. After a specified time of pressure stabilization, the second pressure transmission hole is pressed to further test the pressure bearing performance of the rubber sleeve.

Images