A reciprocating motion test system and test method for a riser expansion joint

Abstract

The application discloses a reciprocating motion test system for a packer of a riser telescopic device, which comprises a frame body, an inner cylinder, a packer box, an outer cylinder, a motion driving mechanism, a plug, a simulated wellhead pressure joint, a hydrostatic pressure device, an operating pressure joint and an air compressor. The application can simulate the actual working condition of the packer of the riser telescopic device under water to test and detect the reciprocating motion sealing performance of the packer. The application further discloses a reciprocating motion test method for the packer of the riser telescopic device. Compressed air is filled into a sealing ring cavity formed outside the packer, water is injected into a ring-shaped sealing cavity formed outside the inner cylinder, the motion driving mechanism drives the inner cylinder to reciprocate up and down, the water pressure of the ring-shaped sealing cavity formed outside the inner cylinder and the leakage of the ring-shaped sealing cavity are detected during the reciprocating motion, and the reciprocating motion test of the packer is completed. The test result of the application is accurate and effective.

Description

Technical Field

[0001] This invention belongs to the technical field of sealing device testing and marine oil drilling and production equipment. It relates to a reciprocating motion test system for packing of a riser expansion joint and a reciprocating motion test method for packing of a riser expansion joint. Background Technology

[0002] The riser expansion joint, installed at the top of the riser system, is a crucial heave compensation device during offshore floating drilling platform operations, used to compensate for the platform's heave movements. The packing, as a vital component of the sealing assembly within the riser expansion joint, is a key part for achieving inner and outer cylinder sealing during displacement compensation. It significantly impacts the sealing performance of the riser expansion joint, thus requiring extremely stringent requirements for its sealing performance and service life. According to the relevant requirements in the API Spec 16F standard for marine drilling hoisting equipment, the expansion joint packing must undergo type verification testing. Specifically, the reciprocating motion test requires the sealing assembly to undergo 100 reciprocating motions of the inner cylinder with a single-sided stroke of 10 feet, and the wear test requires the sealing assembly to undergo 50,000 reciprocating motions of the inner cylinder with a single-sided stroke of 2 feet. This verifies the design accuracy of the expansion joint packing and ensures that its design capabilities meet the target service requirements. To advance the localization of key equipment for offshore drilling, some domestic companies are actively developing key supporting equipment for riser systems. However, the development and performance testing methods for packing used in the development of riser expansion joints are still difficult to break through. In particular, there is no dedicated equipment to simulate the reciprocating motion sealing performance of packing, which hinders the manufacturing of packing. Summary of the Invention

[0003] The purpose of this invention is to provide a test system for the reciprocating motion of packing of a riser expansion joint, which can simulate the actual working conditions of the packing of the riser expansion joint underwater and test its reciprocating motion sealing performance.

[0004] Another objective of this invention is to provide a test method for the reciprocating motion of the packing of a water-supporting pipe expansion joint.

[0005] The first technical solution adopted in this invention is a reciprocating motion test system for packing of a water-supporting pipe expansion joint. Packing I and packing II are fixed within the system to test their reciprocating motion sealing performance. The system includes a frame and an inner cylinder. The frame is fixedly connected to packing boxes I and II, which are vertically arranged. An outer cylinder is fixedly connected between packing boxes I and II. The outer cylinder is equipped with a plug and a simulated wellhead pressure connector. The simulated wellhead pressure connector is connected to a hydrostatic pressure device. Packing box I is fitted over packing I, forming a sealing annular cavity with packing I outside of packing I. Packing box II is fitted outside packing box II and forms a sealed annular cavity with packing box II outside packing box II. Packing box I and packing box II are equipped with operating pressure connectors, which are connected to an air compressor. The inner cylinder is vertically arranged and passes through the inner holes of packing box I, outer cylinder and packing box II. The inner cylinder forms an annular sealed cavity with packing box I, outer cylinder and packing box II outside the inner cylinder. A motion drive mechanism is fixed on the frame. The motion drive mechanism is connected to both ends of the inner cylinder through transmission components and traction components respectively. The motion drive mechanism drives the inner cylinder to reciprocate in the vertical direction.

[0006] The first technical solution of the present invention is further characterized in that,

[0007] Both packing box I and packing box II are connected to the frame via push-pull rods.

[0008] The motion drive mechanism is a two-way hydraulic cylinder, a two-way motor, a two-way motor, or two hydraulic cylinders, two motors, or two motors.

[0009] The transmission components are movable pulleys and fixed pulley blocks or gear racks.

[0010] The traction component is a wire rope, chain, or belt.

[0011] Packing box I and outer cylinder, and packing box II and outer cylinder are fixed by bolts respectively.

[0012] The second technical solution adopted in this invention is a reciprocating motion test method for packing of a riser expansion joint. This method uses the reciprocating motion test system of this invention to test the wear resistance of packing I and packing II, specifically including:

[0013] Operate the air compressor to fill the sealed annular cavity formed by packing I and packing II with compressed air to meet the test air pressure requirements. Operate the hydrostatic pressure device to fill the annular sealed cavity formed by the hydrostatic pressure device with water to meet the test water pressure requirements. Start the motion drive mechanism, which drives the inner cylinder to reciprocate vertically through the transmission and traction components. During the reciprocating motion, monitor the water pressure in the annular sealed cavity formed by the inner cylinder and the leakage of the annular sealed cavity. After the test time is reached, stop the motion drive mechanism, air compressor, and hydrostatic pressure device. Remove packing I and packing II from the reciprocating motion test system to complete the reciprocating motion test of the packing of the water-tight pipe expansion joint.

[0014] The beneficial effects of this invention are:

[0015] This invention discloses a reciprocating motion test system for packing of a riser expansion joint. It simulates the actual use of the packing in a riser expansion joint. Due to the relative movement of the inner and outer cylinders, the volume of the cavity sealed by the packing changes significantly, leading to pressure variations in the sealing cavity. An air compressor and a hydrostatic pressure device are used to compensate for the pressure in the two annular sealing cavities, maintaining a relatively constant pressure. The inner cylinder is vertically positioned to avoid uneven wear during horizontal installation and motion testing of the packing, ensuring that the test results are not affected by other factors and are accurate and effective. This system effectively tests the actual reciprocating motion sealing performance of the packing, which is of great significance for the production and testing of packing.

[0016] This invention provides a method for testing the reciprocating motion of packing for a water-supporting pipe expansion joint. The method is simple and convenient to operate, the pressure in each sealing ring cavity is constant and unaffected by the reciprocating motion, the experimental equipment requirements are small, and the vertical reciprocating motion of the inner cylinder avoids the phenomenon of uneven wear that occurs when the packing is installed horizontally and during the motion test, resulting in more accurate and effective test results. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the reciprocating motion test system of the packing of a water-supporting pipe expansion joint according to the present invention;

[0018] Figure 2 This is a partial cross-sectional view of a test system for the reciprocating motion of packing of a water-supporting pipe expansion joint according to the present invention.

[0019] In the diagram, 1. Inner cylinder, 2. Packing box I, 3. Air compressor, 4. Hydrostatic pressure device, 5. Motion drive mechanism, 6. Push-pull rod II, 7. Push-pull rod I, 8. Frame, 9. Suspension seat I, 10. Fastening bolt I, 11. Packing I, 12. Fastening bolt II, 13. Plug, 14. Outer cylinder, 15. Fastening bolt III, 16. Packing II, 17. Packing box II, 18. Fastening bolt IV, 19. Suspension seat II, 20. Operating pressure connector, 21. Simulated wellhead pressure connector, 22. Moving pulley A, 23. Fixed pulley A, 24. Fixed pulley B, 25. Fixed pulley C. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] This invention discloses a reciprocating motion test system for packing of a water-tight pipe expansion joint. Packing I11 and packing II16 are fixed within the system to test their reciprocating motion sealing performance. The system includes a frame 8 and an inner cylinder 1. The frame 8 is fixedly connected to vertically arranged packing boxes I2 and II17. An outer cylinder 14 is fixedly connected between packing boxes I2 and II17. Packing boxes I2 and the outer cylinder 14 are connected by fastening bolts II12. A suspension seat I9 is ​​fixedly connected to the top of packing box I2 by fastening bolts I10. One end of a push-pull rod I7 is fixedly connected to the suspension seat I9, and the other end of the push-pull rod I7 is fixedly connected to the frame 8. Packing box II17 and the outer cylinder 14 are connected by fastening bolts III15. A suspension seat II19 is fixedly connected to the bottom of packing box II17 by fastening bolts IV18. One end of a push-pull rod II6 is fixedly connected to the suspension seat II19, and the other end of the push-pull rod II6 is fixedly connected to the frame 8. The outer cylinder 14 is equipped with… The plug 13 and the simulated wellhead pressure connector 21 are connected to a hydrostatic pressure device 4. The packing box I2 is fitted outside the packing I11 and forms a sealed annular cavity with the packing I11 outside the packing I11. The packing box II 17 is fitted outside the packing II 16 and forms a sealed annular cavity with the packing II 16 outside the packing II 16. The packing box I2 and the packing box II 17 are equipped with an operating pressure connector 20, which is connected to an air compressor 3. The inner cylinder 1 is vertically arranged and passes through the inner holes of the packing I11, the outer cylinder and the packing II 16. The inner cylinder 1 forms an annular sealed cavity with the packing I11, the outer cylinder 14 and the packing II 16 outside the inner cylinder 1. The frame 8 is fixed with a motion drive mechanism 5 by a pin or bolt. The motion drive mechanism 5 is connected to both ends of the inner cylinder 1 by a transmission component and a traction component, respectively. The motion drive mechanism 5 drives the inner cylinder 1 to reciprocate in the vertical direction.

[0022] The motion drive mechanism 5 is a bidirectional hydraulic cylinder. The transmission components include two sets of symmetrically arranged pulley groups. The pulley groups include a movable pulley A22, a fixed pulley A23, a fixed pulley B24, and a fixed pulley C25. The movable pulley A22 is connected to the piston rod of the bidirectional hydraulic cylinder. The fixed pulleys A23, B24, and C25 are all fixedly connected to the frame 8. The movable pulleys A22, A23, and B24 are all located in the same vertical direction and are arranged sequentially along the extension direction of the bidirectional hydraulic cylinder piston. The fixed pulley C25 is located at the same horizontal height as the fixed pulleys B24. The traction component is a steel wire rope. One end of the steel wire rope is fixed to the rotating shaft of the fixed pulley A23. The steel wire rope passes through the movable pulleys A22, B24, and C25 in sequence, and the other end is fixedly connected to one end of the inner cylinder 1.

[0023] The motion drive mechanism 5 can also be a bidirectional motor or a two-way motor, or two hydraulic cylinders, or two motors.

[0024] The transmission components can also be made of gears and racks.

[0025] The traction component can also be a chain or belt.

[0026] The push-pull rod can be a plug-in adjustable rod, a screw-type adjustable rod, or a fixed-length rod, and can be used for test pieces of different sizes.

[0027] This invention discloses a method for testing the reciprocating motion of packing for a riser expansion joint. The method utilizes the reciprocating motion testing system of this invention to test the reciprocating motion sealing performance of packing I11 and packing II16. Specifically, the method includes:

[0028] Operate air compressor 3 to fill the sealed annular cavity formed by packing I11 and packing II16 with compressed air to meet the test air pressure requirements. Operate hydrostatic pressure device 4 to fill the annular sealed cavity formed by the hydrostatic pressure device 4 with water to meet the test water pressure requirements. Start motion drive mechanism 5. Motion drive mechanism 5 drives the inner cylinder 1 to reciprocate vertically through transmission and traction components. During the reciprocating motion, detect the water pressure in the annular sealed cavity formed by the inner cylinder 1 and the leakage of the annular sealed cavity. After the test time is reached, stop motion drive mechanism, air compressor 3 and hydrostatic pressure device 4. Remove packing I11 and packing II16 from the reciprocating motion test system to complete the reciprocating motion test of the packing of the water-tight pipe expansion device.

Claims

1. A system for reciprocating motion test of a riser expansion joint packing, the packing I (11) and the packing II (16) are fixed therein to test the sealing performance of reciprocating motion, characterized in that, The utility model relates to a reciprocating motion test system of riser expansion joint, including frame body (8) and inner tube (1), frame body (8) fixedly connected with up and down vertical arrangement's packing box I (2) and packing box II (17), packing box I (2) and packing box II (17) between fixedly connected with outer tube (14), outer tube (14) on be provided with plug (13) and simulation well mouth pressure connector (21), simulation well mouth pressure connector (21) are connected with hydrostatic pressure device (4), packing box I (2) are sleeved in packing I (11) outside, and with packing I (11) in packing I (11) outside form sealed ring cavity, packing box II (17) are sleeved in packing II (16) outside, and with packing II (16) in packing II (16) outside form sealed ring cavity, packing box I (2) and packing box II (17) on be provided with operating pressure connector (20), operating pressure connector (20) are connected with air compressor (3), inner tube (1) vertical arrangement, and pass through the inner hole of packing I (11), outer tube and packing II (16), inner tube (1) are formed with annular sealed cavity respectively with packing I (11), outer tube (14) and packing II (16) in inner tube (1) outside, frame body (8) is fixed with motion drive mechanism (5), motion drive mechanism (5) are connected with the both ends of inner tube (1) through transmission part and traction part, motion drive mechanism (5) drive inner tube (1) reciprocating motion in vertical direction.

2. A system for reciprocation testing of a flexing device for a marine riser according to claim 1, wherein, Packing box I (2) and packing box II (17) are connected with frame body (8) through push-pull rod.

3. A system for reciprocating motion testing of a marine riser extension device according to claim 1, wherein, The motion drive mechanism (5) is a double-acting hydraulic cylinder or a double-acting motor or two hydraulic cylinders or two motors.

4. The system of claim 1, wherein, The transmission part is a movable pulley and a fixed pulley set or a gear rack.

5. The system of claim 1, wherein, The traction part is a steel wire rope or a chain or a belt.

6. A system for reciprocation testing of a flexing device for a marine riser according to claim 1, wherein, The packing box I (2) and the outer tube (14), the packing box II (17) and the outer tube (14) are fixed by bolts respectively.

7. A method for reciprocating motion test of the riser expansion joint packing, the reciprocating motion test system for the riser expansion joint packing as claimed in claim 1 is used to test the reciprocating motion sealing performance of the packing I (11) and the packing II (16), characterized in that, Specifically includes: Run air compressor (3), make air compressor (3) to the sealed ring cavity formed outside packing I (11) and packing II (16) fills in compressed air to reach the test air pressure requirement, run hydrostatic pressure device (4), make hydrostatic pressure device (4) to the annular sealed cavity formed outside inner tube (1) injects water to reach the test water pressure requirement, start motion drive mechanism (5), motion drive mechanism (5) drive inner tube (1) to go up and down reciprocating motion in vertical direction through transmission part and traction part, detect the annular sealed cavity water pressure formed outside inner tube (1) and the leakage of the annular sealed cavity in the reciprocating motion process, stop motion drive mechanism, air compressor (3) and hydrostatic pressure device (4) after reaching the test time, take down packing I (11) and packing II (16) from reciprocating motion test system, complete the reciprocating motion test of riser expansion joint.

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