Universal rubber sleeve testing tool and testing method

Abstract

The universal rubber sleeve testing tool comprises an inner pipe, a piston, an outer pipe and a retainer, the inner pipe comprises a central pipe, a mandrel and a lower connector, a first pressure transmission hole is formed in the end, away from the mandrel, of the central pipe, the piston is arranged on the outer wall of the central pipe in a sliding and sleeving mode and communicated with the first pressure transmission hole, and a second pressure transmission hole is formed in the outer wall of the outer pipe; the outer pipe is arranged on the outer wall of the mandrel in a sleeving mode, a testing cavity is defined by the outer pipe, the piston and the lower connector, the outer pipe is provided with a pair of second pressure transmission holes and located at the two ends of the testing cavity, through arrangement of the first pressure transmission holes, a hydraulic type driving setting mode is achieved, and through the hydraulic type driving setting mode, the sealing performance of the tool is higher; through the arrangement of the retainer, the device can simulate two extrusion modes, through the arrangement of the second pressure transmission hole, after the setting of the rubber sleeve is completed, the pressure bearing performance of the rubber sleeve can still be tested by pressing the second pressure transmission hole, and in conclusion, the accuracy of the rubber sleeve test result of the tool is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of downhole tools for oil and gas field development, and in particular to a universal rubber cartridge testing tool and a testing method. Background Art

[0002] In the field of oil extraction, rubber seals in downhole tools play a vital role. Due to complex geological conditions, there are different formation pressures, temperatures and rock properties in the well. For example, in deep oil wells, the formation pressure may be as high as 100MPa or more, and the temperature may reach about 200℃. In this environment, the rubber seal needs to withstand huge external pressure and ensure good sealing performance to prevent well fluid leakage. Therefore, the rubber seal needs to be tested before use. For example, the application publication number CN117968974A is entitled as a packer rubber seal performance test device and its use method, including a simulated sealing device. The packer device and the first pressurizing system are connected to the first end of the simulated packer device through the first pressurizing tubing, and are used to pressurize the simulated packer device so that the simulated packer device can play a sealing role; the second pressurizing system is connected to the second end of the simulated packer device through the second pressurizing tubing, and is used to pressurize the simulated packer device to detect the sealing performance of the simulated packer device; the vibration loading system is connected to the first pressurizing tubing, and is used to load vibration on the simulated packer device to input variable loads to the simulated packer device; the monitoring system is arranged on the simulated packer device, and is used to monitor the pressure and temperature in the simulated packer device in real time.

[0003] However, the above-mentioned rubber cartridge sealing performance test experimental device can only perform test and analysis on a single type of rubber cartridge, or rubber cartridges of similar types and sizes. For rubber cartridges with greatly different types, the rubber cartridge test tooling needs to be redesigned and processed, which undoubtedly increases the production cycle and cost; the above-mentioned rubber cartridge sealing performance test experimental device adopts a mechanical drive device, which limits the heating method of the above-mentioned rubber cartridge sealing performance test experimental device, and can only simulate the downhole temperature environment through methods such as external insulation tape wrapping and constant temperature box, resulting in high heat transfer loss and unable to reach the upper limit of high-temperature resistance of high-grade rubber cartridges; as oil exploration and development extends to deeper and more complex formations, most of the current downhole packers are hydraulic packers, and the above-mentioned rubber cartridge sealing performance test experimental device adopts a mechanical drive device that cannot well reflect the actual deformation and expansion of the rubber cartridge; in summary, the accuracy of the rubber cartridge test results of the above-mentioned rubber cartridge sealing performance test experimental device needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies, to provide a universal rubber cartridge testing tool and a testing method, and to solve the technical problem of inaccurate rubber cartridge testing results in the prior art.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a universal rubber cartridge testing tool and a testing method, comprising: An inner tube, the inner tube comprising a central tube, a core shaft and a lower joint, the central tube, the core shaft and the lower joint are connected in sequence, the outer diameter of the lower joint is larger than the outer diameter of the core shaft, and a first pressure transmission hole is provided at one end of the central tube away from the core shaft; A piston, the piston is slidably sleeved on the outer wall of the central tube and communicated with the first pressure transmission hole; An outer tube, the outer tube is sleeved on the outer wall of the core shaft and forms a test cavity with the piston and the lower joint, and the outer tube is provided with a pair of second pressure transmission holes located at two ends of the test cavity; and A stopper is used to fix the lower joint and the outer tube.

[0006] In some embodiments, the outer tube includes a pair of couplings, a seating sleeve and a casing, the two couplings are respectively sleeved on the outer wall of the piston and the outer wall of the lower joint, the seating sleeve is sleeved between the two couplings, the casing is sleeved on the outer wall of the seating sleeve, and the two ends of the casing are respectively fixedly connected to the two couplings.

[0007] In some embodiments, the stop member includes a stop sleeve and a connecting sleeve, the stop sleeve and the connecting sleeve are clamped with each other, and the stop sleeve and the connecting sleeve are threadedly connected to the coupling and the lower joint respectively.

[0008] In some embodiments, a check member is connected to the piston in the direction of the test cavity, and the check member includes a locking ring seat, a locking ring and a hexagon socket head screw. The locking ring seat and the locking ring are fixedly connected by the hexagon socket head screw, and the locking ring is sleeved on the outer wall of the center tube, and the inner wall of the locking ring is unidirectionally engaged with the outer wall of the center tube.

[0009] In some embodiments, the locking ring seat is sleeved on the outer wall of the locking ring, and the locking ring is unidirectionally engaged with the locking ring seat.

[0010] In some embodiments, the check member is provided with an upper guide ring sleeve in a direction toward the test cavity.

[0011] In some embodiments, a lower guide ring sleeve is provided on the lower joint in a direction toward the test cavity.

[0012] In some embodiments, tooling guide rings are provided at opposite ends of the upper guide ring sleeve and the lower guide ring sleeve.

[0013] In some embodiments, a shear pin is provided between the piston and the center tube.

[0014] In some embodiments, including: S1. The rubber sleeve to be tested is placed on the mandrel; S2. Install the center tube, lower joint, piston and outer tube in sequence; S3. The entire device is oil-immersed and heated; S4. Pressurize the first pressure transmission hole to make the liquid / gas drive the piston and the lower joint to move toward each other, squeeze the rubber cylinder, and simulate sealing; S5. After the pressure is stabilized for a specified time, pressure is applied to the second pressure transmission hole to further test the pressure bearing performance of the rubber cylinder.

[0015] Compared with the prior art, the universal rubber cartridge testing tool and testing method provided by the present invention, on the one hand, realizes a hydraulic driving and sealing method through the setting of the first pressure transmission hole, and the simulation is more realistic than the mechanical driving and sealing method; Secondly, the hydraulic driving and sealing method makes the sealing performance of the tool stronger than that of the mechanical driving and sealing method, so that the tool can be applied to the oil immersion heating method; Secondly, by setting the stopper, the device can simulate two extrusion modes (bidirectional extrusion and unidirectional extrusion); Fourthly, by setting the second pressure transmission hole, after the rubber cylinder is sealed, the pressure bearing performance of the rubber cylinder can still be tested by applying pressure to the second pressure transmission hole; Fifthly, through the segmented design of the inner tube, the device can replace different mandrels according to different rubber cartridges; In summary, the accuracy of the test results of the rubber cylinder by the tooling is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of a universal rubber cartridge testing tool and testing method provided by an embodiment of the present invention is shown in FIG. Figure 1 (Double-sided extrusion rubber cartridge); Figure 2 The structure of a universal rubber cartridge testing tool and testing method provided by an embodiment of the present invention is shown in FIG. Figure 2 (Single-side squeeze cartridge).

[0017] Explanation of the reference numerals in the accompanying drawings: 1. inner tube; 11. center tube; 111. first pressure transmission hole; 12. core shaft; 13. lower joint; 2. piston; 21. shear pin; 3. outer tube; 31. coupling; 32. seating sleeve; 33. casing; 331. second pressure transmission hole; 4. test cavity; 5. stopper; 51. stop sleeve; 52. connecting sleeve; 6. check member; 61. locking ring seat; 62. locking ring; 63. hexagon socket head screw; 7. upper guide ring sleeve; 8. lower guide ring sleeve; 9. tooling guide ring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem of inaccurate rubber cartridge test results, the present invention provides a universal rubber cartridge test tool and a test method, which can improve the accuracy of the rubber cartridge test.

[0020] It should be noted that the universal rubber cartridge testing tool and testing method described in the present invention are used for but not limited to rubber cartridges, etc. For the convenience of explanation, in the present invention, only a universal rubber cartridge testing tool and testing method applied to rubber cartridges are used as an example for explanation, and the principle of applying a universal rubber cartridge testing tool and testing method to other types of equipment is substantially the same as the principle applied to rubber cartridges, which will not be described one by one here.

[0021] See also Figure 1 - Figure 2 ,in Figure 1 It is a structural schematic diagram of a universal rubber cartridge testing tool and a testing method in one embodiment of the present invention. A universal rubber cartridge testing tool includes an inner tube 1, a piston 2, an outer tube 3 and a stopper 5. The inner tube 1 includes a center tube 11, a core shaft 12 and a lower joint 13. The center tube 11, the core shaft 12 and the lower joint 13 are connected in sequence. The outer diameter of the lower joint 13 is larger than the outer diameter of the core shaft 12. A first pressure transmission hole 111 is provided at one end of the center tube 11 away from the core shaft 12. The piston 2 is slidably mounted on the outer wall of the center tube 11 and is connected to the first pressure transmission hole 111. The outer tube 3 is mounted on the outer wall of the core shaft 12 and surrounds a test cavity 4 with the piston 2 and the lower joint 13. The outer tube 3 is provided with a pair of second pressure transmission holes 331 and is located at both ends of the test cavity 4. The stopper 5 is used to fix the lower joint 13 and the outer tube 3.

[0022] In this embodiment, on the one hand, the hydraulic driving setting method is realized by setting the first pressure transmission hole 111, and the simulation is more realistic than the mechanical driving setting method; Secondly, the hydraulic driving and sealing method makes the sealing performance of the tool stronger than that of the mechanical driving and sealing method, so that the tool can be applied to the oil immersion heating method; Secondly, by setting the stopper 5, the device can simulate two extrusion modes (bidirectional extrusion and unidirectional extrusion); Fourthly, by setting the second pressure transmission hole 331, after the rubber cylinder is sealed, the pressure bearing performance of the rubber cylinder can still be tested by applying pressure to the second pressure transmission hole 331; Fifthly, through the segmented design of the inner tube 1, the device can replace different mandrels 12 according to different rubber cartridges; In summary, the accuracy of the test results of the rubber cylinder by the tooling is effectively improved.

[0023] Specifically, the rubber cylinder is installed in the test cavity 4, and the downhole temperature simulation is carried out by immersing the entire rubber cylinder test tooling in high-temperature oil. According to the pressure and temperature level required for the test, the liquid pressure and the oil temperature are adjusted. The downhole pressure simulation is pressurized through the first pressure transmission hole 111 of the central tube 11, so that the liquid / or gas drives the piston 2. When the pressure reaches the starting pressure, the piston 2 moves downward to squeeze the rubber cylinder, and the rubber cylinder expands to realize the simulated sealing process. After the pressure is stabilized for a specified time, the rubber cylinder can be taken out from the test tooling, and the compression state of the rubber cylinder can be analyzed, or gas / liquid pressure can be directly applied from the second pressure transmission hole 331 to test the pressure-bearing performance of the rubber cylinder.

[0024] Furthermore, the test fixture is designed with a central tube 11 with a first pressure transmission hole 111, which simulates the downhole environment by means of gas / hydraulic pressurization to avoid local excessive or insufficient pressure. In this way, the external force on the entire rubber cylinder is uniform, and its deformation during the pressure process, its fit with surrounding components and other reactions are all produced under a balanced stress state, thereby more accurately reflecting the mechanical properties and sealing characteristics of the rubber cylinder itself, and helping to accurately evaluate the quality and applicability of the rubber cylinder. The oil immersion heating method utilizes the good thermal conductivity of oil, and the maximum simulated temperature can reach above 200°C. At the same time, it can make all parts of the rubber cylinder test fixture evenly heated during the heating process, and the oil can transfer heat evenly to the surface and inside of the rubber cylinder to avoid local overheating or excessive temperature differences.

[0025] Furthermore, the rubber cartridge test fixture can withstand a high temperature of 232°C and an environment of 15,000PSI (103.5Mpa), so that the stress and heat conditions of the rubber cartridge during the test are highly consistent with those in actual use, thereby accurately reflecting the performance of the high-strength rubber cartridge and providing a favorable basis for evaluating the reliability of the high-strength rubber cartridge under actual working conditions.

[0026] In one embodiment, see Figure 1 The outer tube 3 includes a pair of couplings 31, a seating sleeve 32 and a sleeve 33. The two couplings 31 are respectively sleeved on the outer wall of the piston 2 and the outer wall of the lower joint 13. The seating sleeve 32 is sleeved between the two couplings 31. The sleeve 33 is sleeved on the outer wall of the seating sleeve 32, and the two ends of the sleeve 33 are respectively fixedly connected to the two couplings 31.

[0027] In this embodiment, a suitable sealing sleeve 32 is selected according to the different diameters of the rubber cylinder, so that the device can be applicable to more rubber cylinders of different sizes. When the sealing sleeve 32 cannot meet the sealing range of the rubber cylinder, the sealing sleeve 32 is removed, so that the rubber cylinder can be directly sealed on the inner wall of the sleeve 33.

[0028] Furthermore, the test fixture is suitable for all universal rubber cartridges ranging from 4.5 inches to 9.5 inches. When testing rubber cartridges of various sizes, there is no need to frequently change the test equipment, which reduces the time for tooling preparation and replacement, greatly improves the overall efficiency of the test, and reduces the production cost and cycle of the test.

[0029] In one embodiment, see Figure 2 The stop member 5 includes a stop sleeve 51 and a connecting sleeve 52. The stop sleeve 51 and the connecting sleeve 52 are mutually clamped, and the stop sleeve 51 and the connecting sleeve 52 are threadedly connected to the coupling 31 and the lower joint 13 respectively.

[0030] In this embodiment, when it is necessary to extrude the rubber cylinder on one side, the stopper 5 is installed, that is, the stop sleeve 51 is threadedly fixedly connected to the coupling 31, the connecting sleeve 52 is threadedly fixedly connected to the lower joint 13, and the connecting sleeve 52 is clamped between the coupling 31 and the stop sleeve 51, so that the lower joint 13 is fixedly connected to the coupling 31, and then during the sealing process, the center pipe 11 cannot move under the restriction of the lower joint 13, that is, the rubber cylinder is extruded on one side.

[0031] In one embodiment, see Figure 1 The piston 2 is connected with a check piece 6 in the direction toward the test cavity 4. The check piece 6 includes a locking ring seat 61, a locking ring 62 and a hexagon socket head screw 63. The locking ring seat 61 and the locking ring 62 are fixedly connected by the hexagon socket head screw 63. The locking ring 62 is sleeved on the outer wall of the center tube 11, and the inner wall of the locking ring 62 is unidirectionally meshed with the outer wall of the center tube 11.

[0032] In this embodiment, the locking ring seat 61 is connected to the piston 2 through a thread, the locking ring 62 is a C-shaped ring structure, and the locking ring 62 structure is a one-way tooth shape. During the sealing process of the rubber cylinder, the relative force trend of the locking ring 62 and the locking ring seat 61 is a forward tooth engagement and can be moved. After the sealing of the rubber cylinder is completed, the relative force trend of the locking ring 62 and the center tube 11 is a reverse tooth engagement, which can maintain the sealing force and ensure the sealing and anchoring effects.

[0033] In one embodiment, see Figure 1 The lock ring seat 61 is sleeved on the outer wall of the lock ring 62 , and the lock ring 62 is unidirectionally meshed with the lock ring seat 61 .

[0034] In this embodiment, the locking ring seat 61 and the locking ring 62 are engaged with each other by a one-way serrated thread, so that the thrust transmitted from the locking ring seat 61 to the locking ring 62 is more uniform, thereby preventing the check member 6 from being damaged due to only the hexagon socket head screw 63 transmitting the thrust.

[0035] In one embodiment, see Figure 1 An upper guide ring sleeve 7 is provided on the direction of the check member 6 toward the test cavity 4 .

[0036] In this embodiment, the upper guide ring sleeve 7 is used to adjust the length between the piston 2 and the rubber cylinder. According to the rubber cylinders of different lengths, upper guide ring sleeves 7 of different lengths can be replaced, so that the device can be applicable to rubber cylinders of different specifications, thereby improving the versatility of the device.

[0037] In one embodiment, see Figure 1 A lower guide ring sleeve 8 is provided on the lower joint 13 facing the test cavity 4 .

[0038] In this embodiment, the lower guide ring sleeve 8 has a reversing function, which is convenient for disassembly and assembly.

[0039] In one embodiment, see Figure 2 The opposite ends of the upper guide ring sleeve 7 and the lower guide ring sleeve 8 are both provided with tooling guide rings 9.

[0040] In this embodiment, the function of the tooling guide ring 9 is to better fit the rubber cylinder and improve the extrusion effect of the rubber cylinder.

[0041] In one embodiment, see Figure 1 A shear pin 21 is provided between the piston 2 and the center tube 11 .

[0042] Furthermore, a large number of double O-rings and back-ring sealing structures are used to ensure that no leakage occurs during the rubber cylinder testing process. Among them, the O-ring and back-ring seal the piston 2 chambers, the O-ring and back-ring seal the upper annulus of the rubber cylinder, the O-ring and back-ring seal the lower annulus of the rubber cylinder, and the O-ring and back-ring seal the center tube 11. Compared with the single O-ring back-ring seal, it can better prevent leakage during the pressurization process. The double O-ring back-ring sealing structure can provide a stable and reliable sealing effect under different pressure and temperature conditions, reduce the occurrence of test interruptions or inaccurate data due to sealing problems, improve the overall reliability and stability of the test tooling, and provide a strong guarantee for the performance evaluation of downhole rubber cylinders.

[0043] In this embodiment, the shear pin 21 is used to simulate the sealing process of a real scene. When the first pressure transmission hole 111 is pressurized to the starting pressure, the shear pin 21 is sheared off, and the piston 2 can move toward the rubber cylinder.

[0044] In one embodiment, see Figure 1 - Figure 2 , S1. The rubber sleeve to be tested is mounted on the mandrel 12; S2. Install the center tube 11, the lower joint 13, the piston 2 and the outer tube 3 in sequence; S3. The entire device is oil-immersed and heated; S4. Pressurize the first pressure transmission hole 111 to drive the liquid / gas driven piston 2 and the lower joint 13 to move toward each other, squeeze the rubber cylinder, and simulate the packing; S5. After the pressure is stabilized for a specified time, pressure is applied to the second pressure transmission hole 331 to further test the pressure bearing performance of the rubber cylinder.

[0045] Furthermore, the test fixture can simulate various stress forms of the downhole packer rubber cartridge. In the actual complex downhole environment, the rubber cartridge may face extrusion pressure from a single side. For example, in some asymmetric structure installation environments, only one side of the rubber cartridge is in extrusion contact with other components. There may also be extrusion on both sides, such as downhole tools that are symmetrically installed and are subject to external forces on both sides. The test fixture can simulate these two different extrusion states, making the test of the rubber cartridge performance more in line with the diverse stress conditions during actual use, thereby more comprehensively and accurately understanding the key indicators of the rubber cartridge under different stress forms, such as pressure bearing capacity, sealing performance, and degree of deformation, to avoid only testing a single extrusion state and missing possible problems with the rubber cartridge under other stress conditions.

[0046] In order to better understand the present invention, the following Figure 1 to Figure 2 The technical solution of the present invention is described in detail: Double-sided extrusion, pressurizing the first pressure transmission hole 111 of the center tube 11, the pressure enters the piston 2 through the first pressure transmission hole 111 of the center tube 11, when the pressure reaches the starting pressure, the shear pin 21 is cut off, and the rubber cylinder test fixture is started. The piston 2 moves downward under the pressure, and there is no constraint at the lower end, that is, the stopper 5 is not connected, the center tube 11 moves upward and drives the core shaft 12 and the lower joint 13 to move upward together, the upper end face of the lower joint 13 is in contact with the lower end face of the lower guide ring sleeve 8, so in the process of upward displacement, the lower joint 13 pushes the lower guide ring sleeve 8 to move upward, 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, so in the process of upward displacement, the lower guide ring sleeve 8 pushes the fixture guide ring 9 to move upward; When the lock ring seat 61 moves downward, it meshes with the lock ring 62 in the same direction. The lower end surface of the lock ring seat 61 is in contact with the upper end surface of the upper guide ring sleeve 7. Therefore, in the process of downward displacement, the lock ring seat 61 pushes the upper guide ring sleeve 7 to move downward. Similarly, the lower end surface of the upper guide ring sleeve 7 is in contact with the upper end surface of the tooling guide ring 9. Therefore, in the process of downward displacement, the upper guide ring sleeve 7 pushes the tooling guide ring 9 to move downward. Therefore, when there is no constraint at the lower end, the rubber cylinder is squeezed evenly on both sides, and the tooling guide rings 9 on both sides of the rubber cylinder are connected to the back ring outside the tested rubber cylinder assembly through threads. The tested rubber cylinder is squeezed and gradually expands to fit the setting sleeve 32, completing the setting test. One-side extrusion, when a fixed constraint is applied to the lower end, that is, the stop sleeve 51 and the connecting sleeve 52 are respectively connected and fastened to the coupling 31 and the lower joint 13 through threads, so that the lower joint 13 is fixedly connected to the coupling 31, and the inner tube 1 cannot move, thereby making the stress state of the tested rubber cylinder assembly become one-way extrusion on the upper side; No matter it is double-sided extrusion or single-sided extrusion, after the test is completed, the test fixture has no redundant structure and is easy to disassemble. After taking out the external components such as the seating sleeve 32 and the coupling 31, the entire rubber cylinder can be directly taken out for compression state analysis without spending a lot of time on complicated disassembly operations, thereby effectively shortening the test time of a single rubber cylinder, significantly improving the overall test efficiency, and accelerating the progress of research and development, production or quality inspection. The rubber cylinder that can be completely taken out can maintain its original shape, size and performance state after the test, and will not damage the intact rubber barrel after the experiment. It is beneficial for testers to accurately observe and measure various parameters of the rubber cylinder after compression, such as deformation, wear degree, etc., so as to obtain more accurate and reliable test data, and provide a strong basis for the compression performance evaluation and quality judgment of the rubber cylinder; At the same time, two second pressure transmission holes 331 are provided on the sleeve 33, and the pressure bearing performance of the rubber cylinder can be tested at different levels by applying gas / liquid pressure.

[0047] The above specific implementation modes of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A universal rubber cartridge testing tool, characterized in that: include: An inner tube, the inner tube comprising a central tube, a core shaft and a lower joint, the central tube, the core shaft and the lower joint are connected in sequence, the outer diameter of the lower joint is larger than the outer diameter of the core shaft, and a first pressure transmission hole is provided at one end of the central tube away from the core shaft; A piston, the piston is slidably sleeved on the outer wall of the central tube and communicated with the first pressure transmission hole; An outer tube, the outer tube is sleeved on the outer wall of the core shaft and forms a test cavity with the piston and the lower joint, and the outer tube is provided with a pair of second pressure transmission holes located at two ends of the test cavity; and A stopper is used to fix the lower joint and the outer tube.

2. A universal rubber cartridge testing tool according to claim 1, characterized in that: The outer tube includes a pair of couplings, a seating sleeve and a casing. The two couplings are respectively sleeved on the outer wall of the piston and the outer wall of the lower joint. The seating sleeve is sleeved between the two couplings. The casing is sleeved on the outer wall of the seating sleeve, and the two ends of the casing are respectively fixedly connected to the two couplings.

3. A universal rubber cartridge testing tool according to claim 2, characterized in that: The stopper comprises a stop sleeve and a connecting sleeve, the stop sleeve and the connecting sleeve are mutually clamped, and the stop sleeve and the connecting sleeve are respectively threadedly connected to the coupling and the lower joint.

4. A universal rubber cartridge testing tool according to claim 1, characterized in that: The piston is connected with a check piece in the direction toward the test cavity, and the check piece includes a locking ring seat, a locking ring and a hexagon socket head screw. The locking ring seat and the locking ring are fixedly connected by the hexagon socket head screw, and the locking ring is sleeved on the outer wall of the center tube, and the inner wall of the locking ring is unidirectionally meshed with the outer wall of the center tube.

5. A universal rubber cartridge testing tool according to claim 4, characterized in that: The lock ring seat is sleeved on the outer wall of the lock ring, and the lock ring is unidirectionally meshed with the lock ring seat.

6. A universal rubber cartridge testing tool according to claim 4, characterized in that: The non-return member is provided with an upper guide ring sleeve in a direction facing the test cavity.

7. A universal rubber cartridge testing tool according to claim 6, characterized in that: The lower joint is provided with a lower guide ring sleeve in the direction facing the test cavity.

8. The universal rubber cartridge testing tool according to claim 7, characterized in that: The opposite ends of the upper guide ring sleeve and the lower guide ring sleeve are both provided with tooling guide rings.

9. The universal rubber cartridge testing tool according to claim 1, characterized in that: A shear pin is provided between the piston and the center tube.

10. A universal rubber cartridge testing tool according to any one of claims 1 to 9 The testing method is characterized in that include: S1. The rubber sleeve to be tested is placed on the mandrel; S2. Install the center tube, lower joint, piston and outer tube in sequence; S3. The entire device is oil-immersed and heated; S4. Pressurize the first pressure transmission hole to make the liquid / gas drive the piston and the lower joint to move toward each other, squeeze the rubber cylinder, and simulate sealing; S5. After the pressure is stabilized for a specified time, pressure is applied to the second pressure transmission hole to further test the pressure bearing performance of the rubber cylinder.

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