A mechanical compression-set packer testing device and method of use

Abstract

The application is a kind of mechanical compression setting packer testing device and using method, which is provided with power liquid cylinder, the lower part of sealing end cover is connected with upper joint provided with upper pressure testing port, upper working outer cylinder, connecting sleeve provided with pressure testing joint, lower working outer cylinder and lower joint in sequence; the upper end of center tube is connected with piston rod through upper connecting joint inserted outside the piston rod, and the lower part is connected with sealing short section pressure ring through oil pipe coupling and sliding sealing short section; the annulus between sliding sealing short section and lower working outer cylinder and lower joint is provided with packer lock releasing mechanism; the upper joint of measured packer sleeved outside the center tube is connected with upper connecting joint, and the lower joint of measured packer is connected with oil pipe coupling. In the device, the packer lock releasing mechanism is designed to be detachable outside, so that the setting and releasing operation of measured packer is simple and convenient to disassemble and assemble. The application adopts manual operation, and can realize setting track reversing and slip anchoring of measured packer.

Description

Technical Field

[0001] This invention relates to a performance testing device for downhole packers in oil and gas wells, specifically a testing device and method for a mechanical compression setting packer. Background Technology

[0002] Packers are a type of downhole tool widely used in oil and gas well operations. They are devices with elastic sealing to seal the annular space between the oil well and the casing. They are widely used in downhole operations such as stratified oil production, stratified fracturing, and stratified water injection to isolate the producing layer, control fluids, and protect the casing.

[0003] As oil and gas field development progresses, formation conditions become increasingly complex, leading to frequent packer failures. The complex processes place higher demands on the packer's pressure resistance and other performance characteristics. Therefore, packers must undergo comprehensive indoor performance testing before being deployed into the well to minimize downhole accidents caused by tool quality issues and ensure safe production in oil and gas wells.

[0004] Currently, performance tests on mechanically compressed set packers such as the Y221 are generally conducted using test fixtures or by running them into test wells. These packers typically use a centralizer to assist in anchoring and setting the packer slips. The centralizer is an elastic body with an interference fit to the test casing. When installing the test casing or running it into the test well, it requires power to press in, and setting also requires a power source to push the packer string and apply pressure. Especially after setting and pressure tests using existing test fixtures, unsealing operations are generally not possible using the existing fixtures alone; specialized equipment such as tension / compression test frames are required. This process is complex, involves high labor intensity for test personnel, and results in long work cycles and low efficiency for large-scale packer testing.

[0005] To address the testing challenges of packers, the following related patent technology has emerged: Application No. 201010518235.1 discloses a multi-purpose ultra-high pressure packer testing device, comprising an ultra-high pressure cylinder, a lower sealing structure and an upper sealing structure disposed at the lower and upper ends of the ultra-high pressure cylinder, a test auxiliary component disposed inside the ultra-high pressure cylinder, and a heating jacket disposed on the outer wall of the ultra-high pressure cylinder. This invention effectively enables high-temperature and high-pressure testing of compression and expansion packer assemblies of various sizes within the same container.

[0006] However, when the above-mentioned device sets and releases the mechanical compression packer, in addition to the pressure testing pump, other external loading mechanisms are required.

[0007] Patent application number 201910126620.2 discloses a packer testing device and its usage method. The device includes a central tube, a limiting screw sleeve, a connecting screw sleeve, a sealing ring, a housing, an injection head, a packer, etc., and can test the packer's setting start force, setting stroke, and setting force.

[0008] However, when the above-mentioned device is set, in addition to the pressure testing pump, other loading mechanisms are required, and manual locking is required during loading, which poses a safety hazard.

[0009] Given the current status of packer testing equipment, it is necessary to improve the packer testing equipment to solve the aforementioned problems in order to improve work efficiency when using packer testing fixtures for packer performance testing. Summary of the Invention

[0010] To address the problems of complex operation, high labor intensity, and low work efficiency in current performance testing of mechanical compression-set packers, this invention provides a testing device and method for mechanical compression-set packers. This eliminates the need for additional loading equipment when testing the performance of mechanical compression packers, making operation convenient, reducing operator labor intensity, and improving the efficiency of packer testing and experimental research.

[0011] The technical solution of this invention is: a mechanical compression setting packer testing device, comprising a power hydraulic cylinder, a setting pressure port in the upper end cover of the power hydraulic cylinder, and a release pressure port in the sealing end cover. A piston is fitted onto the upper part of a piston rod connected to a sealing plug, and the piston rod can slide within the sealing end cover. The lower part of the sealing end cover is sequentially connected to an upper connector with an upper pressure test port, an upper working outer cylinder, a connecting sleeve with a pressure test connector, a lower working outer cylinder, and a lower connector. The upper end of the central tube passes through an upper connecting connector inserted outside the piston rod and connects to the piston rod; the lower part passes through an oil pipe coupling and a sliding seal. The short section is connected to the sealing short section pressure ring; the annular space between the sliding sealing short section and the lower working outer cylinder and the lower connector is equipped with a packer locking and unlocking mechanism; the packer locking and unlocking mechanism is equipped with a locking sleeve, a sealing ring, a retaining ring, a locking ring and a locking sleeve pressure ring. The locking sleeve pressure ring is connected to the lower end of the sliding sealing short section. The locking sleeve, locking ring, sealing ring and retaining ring are installed from the inside to the outside in the annular space between the sliding sealing short section, the lower working outer cylinder and the lower connector. The locking ring and the locking sleeve are engaged by a toothed fastener, and the retaining ring is connected to the sealing ring; the upper connector of the packer under test, which is sleeved outside the central tube, is connected to the upper connecting connector, and the lower connector of the packer under test is connected to the oil pipe coupling.

[0012] Preferably, the locking ring is an open ring with a toothed buckle on its inner circle, and the ring body of the locking ring has a longitudinally penetrating straight groove or oblique groove; the locking ring is fitted outside the lower outer circle of the lock sleeve and is located in the annular space between the lower inner surface of the sealing ring and the lower outer surface of the lock sleeve.

[0013] Preferably, the upper outer circle of the lock sleeve is provided with a toothed buckle that can cooperate with the toothed buckle of the lock ring, and the lock sleeve is installed below the limiting step on the lower part of the outer circle of the sliding sealing short section.

[0014] Preferably, the sealing ring is a non-uniform diameter cylindrical body and both the inner and outer circles of the upper body are provided with sealing elements. Below the step of the lower inner circle of the sealing ring is a locking ring mounting cavity, in which a locking ring can be installed.

[0015] Preferably, the retaining ring is a non-uniform diameter cylindrical body, and a sealing ring and a locking ring can be installed in the inner annular space formed by the central hole of the retaining ring and the upper ring body; the lower working outer cylinder can be installed in the annular space between the upper ring body of the retaining ring and the lower connector.

[0016] Preferably, the sliding sealing short section is a non-uniform diameter cylindrical body with a limiting step on its outer wall, and a locking sleeve is installed below the limiting step; the upper part of the sliding sealing short section is connected to the oil pipe coupling by an oil pipe thread, and the lower part is connected to the locking sleeve pressure ring by a thread, and the internal threads at both ends of the oil pipe coupling are oil pipe threads; the lower external thread of the upper connecting joint is an oil pipe thread.

[0017] Preferably, the lower part of the sealing end cap is sequentially threaded to the upper connector, the upper working outer cylinder, the connecting sleeve, the lower working outer cylinder, and the lower connector; the upper part of the central tube passes through the upper connecting connector and is threaded to the piston rod; the oil pipe coupling and the sliding sealing short section are sleeved on the lower part of the central tube and the sliding sealing short section connected to the locking sleeve pressure ring sits on top of the sealing short section pressure ring that is threaded to the central tube.

[0018] Preferably, the packer stabilizer of the packer under test, after being connected to the upper connecting joint, is exposed outside the upper working outer cylinder; the inner circle of the connecting sleeve is clearance-fitted with the outer circle of the packer stabilizer.

[0019] Preferably, the upper connector is a non-uniform diameter cylindrical body with internal threads at both the upper and lower ends. When the upper connector is connected to the sealing end cap and the upper working outer cylinder, the upper test pressure port corresponds exactly to the annular space formed by the sealing end cap, the upper connecting connector and the packer under test. The upper test pressure port, the unsealing pressure port and the setting pressure port are all sealing threaded holes.

[0020] A method for using a mechanical compression-setting packer testing device includes the following steps: A. Assembling the power cylinder; B. Installing the packer testing device and the packer under test, as well as the packer slips for anchoring the packer under test; C. Setting the packer under test; D. Performing a pressure resistance test on the packer sleeve of the packer under test; E. Unsealing the packer under test from the packer testing device.

[0021] Preferably, the mechanical compression setting packer test device and the packer under test installed therein are placed together in a constant temperature chamber, which can perform setting, pressure resistance and unsealing tests on the packer under high temperature conditions.

[0022] The present invention has the following significant advantages: In this device, the packer locking and unlocking mechanism is designed to be externally detachable, which makes the setting and unlocking operations of the packer under test simple and convenient to disassemble and assemble.

[0023] In this device, the upper connecting joint is inserted into the lower outer surface of the piston rod, and the packer under test is locked with the assistance of the central tube and the pressure ring. Its installation is simple and quick.

[0024] In the device of the present invention, the packer stabilizer of the packer under test after being connected to the upper connecting joint is exposed outside the upper working outer cylinder, and the inner diameter of the connecting sleeve is larger than the outer diameter of the packer stabilizer. The packer under test and the packer test device do not need to be installed by power equipment. The seat track reversal and slip anchoring of the packer under test can be achieved by manual operation.

[0025] When testing a packer using this invention, the device itself only needs to provide a downward thrust to achieve packer setting. Furthermore, this device can simultaneously meet the requirements for slip anchoring, pressure testing, and unsealing of the packer under test.

[0026] The testing apparatus provided by this invention is manually operated and can realize the reversal of the setting track and the anchoring of the slips of the packer under test. During setting and unsetting, the packer under test is locked and unlocked by the packer locking and unlocking mechanism of this invention, and all components of the packer locking and unlocking mechanism are externally detachable, making operation simple and disassembly convenient. When using the apparatus of this invention to perform setting, pressure withstand, and unsetting tests on the packer under test, it only needs to be connected to the pressure testing pump; no other power equipment is required.

[0027] When used with a constant temperature chamber, this invention can meet the testing requirements for setting, pressure resistance and unsealing of mechanically compressed packers under high temperature conditions. High temperature performance tests of this type of packer can be conducted using this device.

[0028] In summary, this invention employs manual operation, enabling the reversal of the seat track and anchoring of the test packer. It is simple to operate and easy to assemble and disassemble; no other power unit is required for the test, resulting in lower testing costs and significant practical effects and application value. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0030] Figure 1This is a schematic diagram of a mechanical compression setting packer test device.

[0031] Figure 2 This is a schematic diagram of the working state of the present invention when performing a slip anchoring test on the packer under test.

[0032] Figure 3 This is a schematic diagram of the working state of the packer under test during the setting test of the present invention.

[0033] Figure 4 This is a schematic diagram of the working state of the packer under test during the unsealing test of the present invention.

[0034] In the picture:

[0035] 1. Upper end cover; 2. Cylinder barrel; 3. Sealing end cover; 4. Upper connector; 5. Upper working outer cylinder; 6. Connecting sleeve; 7. Lower working outer cylinder; 8. Lower connector; 9. Locking sleeve pressure ring; 10. Sealing short section pressure ring; 11. Retaining ring; 12. Locking ring; 13. Sealing ring; 14. Locking sleeve; 15. Sliding sealing short section; 16. Oil pipe coupling; 17. Test pressure connector; 18. Central pipe; 19. Upper connecting connector; 20. Upper test pressure port; 21. Unsealing pressure port; 22. Piston rod; 23. Sealing plug; 24. Piston; 25. Sealing pressure port.

[0036] The packer under test is 26, the packer sleeve is 26-1, the packer slip is 26-2, and the packer stabilizer is 26-3. Detailed Implementation

[0037] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this invention. The technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] 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 illustrative and not intended to limit the invention.

[0039] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] See Figure 1 - Figure 4 A mechanical compression setting packer test device is provided, comprising a power hydraulic cylinder, an upper end cover 1 of which is provided with a setting pressure port 25, and a sealing end cover 3 is provided with a release pressure port 21. A piston 24 is fitted onto the upper part of a piston rod 22 connected to a sealing plug 23, and the piston rod 22 can slide in the sealing end cover 3. The lower part of the sealing end cover 3 is sequentially connected to an upper connector 4 with an upper test pressure port 20, an upper working outer cylinder 5, a connecting sleeve 6 with a test pressure connector 17, a lower working outer cylinder 7, and a lower connector 8. The upper end of the central tube 18 passes through an upper connecting connector 19 inserted outside the piston rod 22 and connects to the piston rod 22, and the lower part passes through an oil pipe coupling 16 and a sliding sealing short section 15 and connects to a sealing short section pressure ring 10. Connection; a packer locking and unlocking mechanism is installed in the annular space between the sliding sealing short section 15, the lower working outer cylinder 7, and the lower connector 8; the packer locking and unlocking mechanism is provided with a locking sleeve 14, a sealing ring 13, a retaining ring 11, a locking ring 12, and a locking sleeve pressure ring 9. The locking sleeve pressure ring 9 is connected to the lower end of the sliding sealing short section 15. The locking sleeve 14, the locking ring 12, the sealing ring 13, and the retaining ring 11 are installed from the inside out in the annular space between the sliding sealing short section 15, the lower working outer cylinder 7, and the lower connector 8. The locking ring 12 and the locking sleeve 14 are engaged by a toothed fastener, and the retaining ring 11 is connected to the sealing ring 13; the upper connector of the packer 26 under test, which is sleeved outside the central tube 18, is connected to the upper connecting connector 19, and the lower connector of the packer 26 under test is connected to the oil pipe coupling 16.

[0041] The device of this invention is manually operated and can realize the reversal of the setting track and the anchoring of the slips in the packer 26 under test. When the packer 26 under test is set and unset, it can be locked and unlocked by the packer locking and unlocking mechanism at the bottom of the device.

[0042] The locking and unlocking components in the packer locking and unlocking mechanism of this invention are all externally detachable, making them simple to operate and easy to assemble and disassemble. Furthermore, this invention requires no other power equipment besides the test pump. When performing setting, pressure withstand, and unlocking tests on the packer 26 under test, it only needs to be connected to the test pump; no other power equipment is required.

[0043] When the packer 26 under test is set, the setting pressure port 25 in the upper cover 1 is connected to the pressure pipeline and the test pump, and the test pump pressurizes the cavity between the upper cover 1, the sealing plug 23 and the piston 24.

[0044] When conducting the pressure resistance test on the packer 26, connect the pressure testing line to the upper test port 20 in the upper connector 4, and use the test pump to pressurize the upper ring of the packer sleeve 26-1 in the air to test the packer sleeve 26-1's resistance to upper pressure differential. Similarly, connect the pressure testing line to the test connector 17, and use the test pump to pressurize the lower ring of the packer sleeve 26-1 in the air to test the packer sleeve 26-1's resistance to lower pressure differential.

[0045] When the packer 26 under test is unsealed, the lower connector 8, locking sleeve pressure ring 9, and retaining ring 11 are removed, and the locking ring 12 and locking sleeve 14 can then be taken out. Connect the unsealing pressure port 21 of the sealing end cap 3 to the pressure pipeline and the pressure test pump. The pressure test pump can then pressurize the cavity between the sealing end cap 3 and the piston 24 to unseal the packer 26 under test in the device of the present invention.

[0046] Based on the above embodiment one, the present invention also has the following embodiments: a preferred embodiment: the locking ring 12 is an open ring and has a toothed buckle on its inner circle, and the ring body of the locking ring 12 has a longitudinally penetrating straight groove or oblique groove; the locking ring 12 is fitted outside the lower outer circle of the locking sleeve 14 and is located in the annular space between the lower inner surface of the sealing ring 13 and the lower outer surface of the locking sleeve 14.

[0047] In a preferred embodiment, the upper outer circle of the lock sleeve 14 is provided with a toothed buckle that can cooperate with the toothed buckle of the lock ring 12, and the lock sleeve 14 is installed below the limiting step on the lower part of the outer circle of the sliding sealing section 15.

[0048] In a preferred embodiment, the sealing ring 13 is a non-uniform diameter cylindrical body, and both the inner and outer circles of the upper body are provided with sealing elements. Below the step of the lower inner circle of the sealing ring 13 is a locking ring mounting cavity, in which a locking ring 12 can be installed.

[0049] In a preferred embodiment: the retaining ring 11 is a non-uniform diameter cylindrical body, and the sealing ring 13 and the locking ring 12 can be installed in the inner annular space formed by the central hole of the retaining ring 11 and the upper ring body; the lower working outer cylinder 7 can be installed in the annular space between the upper ring body of the retaining ring 11 and the lower connector 8.

[0050] In a preferred embodiment: the sliding sealing section 15 is a non-uniform diameter cylindrical body with a limiting step on its outer wall, and a locking sleeve 14 is installed below the limiting step. ，The locking sleeve 14 is fixed below the limiting step of the sliding sealing section 15; the upper part of the sliding sealing section 15 is connected to the oil pipe coupling 16 by oil pipe threads, and the lower part is connected to the locking sleeve pressure ring 9 by threads. The internal threads at both ends of the oil pipe coupling 16 are oil pipe threads; the lower external thread of the upper connecting joint 19 is an oil pipe thread. The oil pipe coupling 16 and the upper connecting joint 19 are respectively connected to the upper and lower joints of the packer 26 under test by oil pipe threads.

[0051] In a preferred embodiment: the lower part of the sealing end cap 3 is sequentially threaded to the upper connector 4, the upper working outer cylinder 5, the connecting sleeve 6, the lower working outer cylinder 7, and the lower connector 8; the upper part of the central tube 18 passes through the upper connecting connector 19 and is threaded to the piston rod 22; the oil pipe coupling 16 and the sliding sealing short section 15 are sleeved on the lower part of the central tube 18 and connected to the locking sleeve pressure ring 9. The sliding sealing short section 15 sits on top of the sealing short section pressure ring 10 that is threaded to the central tube 18.

[0052] In a preferred embodiment: the packer stabilizer 26-3 of the packer under test 26, after being connected to the upper connecting joint 19, protrudes outside the upper working outer cylinder 5; the inner circle of the connecting sleeve 6 is clearance-fitted with the outer circle of the packer stabilizer 26-3. The test operator can manually operate the packer stabilizer 26-3 to place the packer under test 26 in the test setting track. Pushing the packer stabilizer 26-3 upwards allows the packer slips 26-2 to open and be supported within the inner cavity of the upper working outer cylinder 5. Then, the connecting sleeve 6 is threadedly connected to the upper working outer cylinder 5. Because the inner circle of the connecting sleeve 6 is clearance-fitted with the outer circle of the packer stabilizer 26-3, the connection can be completed manually.

[0053] In a preferred embodiment: the upper connector 4 is a non-uniform diameter cylindrical body with internal threads at both ends. When the upper connector 4 is connected to the sealing end cap 3 and the upper working outer cylinder 5, the upper test pressure port 20 corresponds precisely to the annular space formed by the sealing end cap 3, the upper connecting connector 19, and the packer under test 26. The upper test pressure port 20, the unsealing pressure port 21, and the setting pressure port 25 are all sealing threaded holes, facilitating testing. In the device of this invention, sealing elements are provided at all connection points where sealing is required for each component.

[0054] A method for using a test apparatus for a mechanical compression setting packer includes the following steps: A: Assemble the power hydraulic cylinder: Before the test, install each component of the power hydraulic cylinder as a single module.

[0055] B. Install the packer test apparatus and the packer under test 26, as well as the packer slip 26-2 for anchoring the packer under test 26:

[0056] During this process, the upper connector of the packer 26 under test is connected to the upper connecting connector 19 via a tubing thread, and its lower connector is connected to the tubing coupling 16 and the sliding sealing short section 15 in sequence via a tubing thread.

[0057] Connect the upper connector 4 to the upper working outer cylinder 5 by thread and slide it over the upper part of the packer 26 under test. Insert the lower part of the piston rod 22 in the power cylinder into the upper connecting connector 19, and then connect the upper connector 4 to the sealing end cap 3 by thread. Insert the central tube 18 through the lower part of the packer 26 under test and connect it to the lower part of the piston rod 22 by thread. Thread the sealing short section pressure ring 10 to the lower part of the central tube 18 and lock it. At this time, the packer centralizer 26-3 is exposed outside the upper working outer cylinder 5.

[0058] The tester manually operates the packer stabilizer 26-3 to place the packer 26 under test in the test state on the sealing track; push the packer stabilizer 26-3 upward to open the packer slip 26-2 and support it in the inner cavity of the upper working outer cylinder 5.

[0059] Then connect the connecting sleeve 6 to the upper working outer cylinder 5 by thread. Since the inner circle of the connecting sleeve 6 and the outer circle of the packer centralizer 26-3 are in clearance fit, the connection can be completed manually.

[0060] Then, connect the connecting sleeve 6 to the lower working cylinder 7 by thread, and finally install the lower working cylinder 7, the lower connector 8, and the remaining parts of the packer locking and unlocking mechanism.

[0061] C. Setting the packer under test 26:

[0062] In this step, the setting and pressure port 25 of the upper end cover 1 is connected to the pressure pipeline and the pressure test pump. The pressure test pump pressurizes the cavity between the upper end cover 1, the sealing plug 23 and the piston 24. The pressure acts on the upper end face of the sealing plug 23 and the piston 24 and forms a downward thrust.

[0063] At this time, since the packer slip 26-2 is in the open state and anchored on the upper working outer cylinder 5, the thrust acts on the packer sleeve 26-1, which can compress the packer sleeve 26-1 to set it.

[0064] Simultaneously, the downward thrust drives the central tube, oil pipe coupling 16, sliding sealing section 15, and locking sleeve 14 of the packer 26 under test downward, causing relative sliding between the locking ring 12 and the locking sleeve 14. After the packer sleeve 26-1 is compressed to the design position, the locking sleeve 14 and other components also stop moving. Through the engagement of the toothed thread between the locking ring 12 and the locking sleeve 14, the central tube and other components of the packer 26 under test are locked to prevent retraction and maintain the setting force.

[0065] D. Perform a pressure resistance test on the packer sleeve 26-1 of the packer 26 under test: In this step, connect the pressure testing line to the upper test port 20 in the upper connector 4, and pressurize the upper annular space between the packer sleeve 26-1 and the upper working outer cylinder 5 through the test pressure pump to test the packer sleeve 26-1's ability to withstand the upper pressure difference.

[0066] Similarly, by connecting the pressure testing line to the test joint 17 in the connecting sleeve 6, the pressure testing pump can be used to pressurize the lower annulus between the packer sleeve 26-1 and the connecting sleeve 6 and the lower working outer cylinder 7, which can test the packer sleeve 26-1's resistance to differential pressure.

[0067] E. Packer 26 under test in the packer unsealing test apparatus:

[0068] Remove the lower connector 8, locking sleeve pressure ring 9, and retaining ring 11, and then remove the locking ring 12 and locking sleeve 14.

[0069] Connect the unsealing pressure port 21 of the sealing end cap 3 to the pressure pipeline and the pressure test pump. Pressurize the cavity between the sealing end cap 3 and the piston 24 through the pressure test pump. The pressure acts on the lower end face of the piston 24 and forms an upward pulling force, which drives the packer 26 under test to move upward, thereby unsealing the packer 26 under test.

[0070] In a preferred embodiment, the mechanical compression setting packer test apparatus and the packer 26 installed therein are placed together in a constant temperature chamber, which can perform setting, pressure resistance and unsealing tests on the packer 26 under high temperature conditions.

[0071] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. A mechanical compression setting packer test device, comprising a power hydraulic cylinder, wherein a setting pressure port (25) is provided in the upper end cover (1) of the power hydraulic cylinder, and a release pressure port (21) is provided in the sealing end cover (3), wherein a piston (24) is fitted on the upper part of a piston rod (22) connected to a sealing plug (23), and the piston rod (22) is capable of sliding in the sealing end cover (3), characterized in that, The lower part of the sealing end cap (3) is sequentially connected to the upper connector (4) with an upper test port (20), the upper working outer cylinder (5), the connecting sleeve (6) with a test connector (17), the lower working outer cylinder (7), and the lower connector (8); the upper end of the central tube (18) passes through the upper connecting connector (19) inserted outside the piston rod (22) and connects to the piston rod (22), and the lower part passes through the oil pipe coupling (16) and the sliding sealing short section (15) and connects to the sealing short section pressure ring (10); the annular space between the sliding sealing short section (15) and the lower working outer cylinder (7) and the lower connector (8) is equipped with a packer locking and unlocking mechanism; the packer locking and unlocking mechanism is equipped with a locking sleeve (14) and a sealing ring ( 13) Retaining ring (11), locking ring (12) and locking sleeve pressure ring (9). The locking sleeve pressure ring (9) is connected to the lower end of the sliding sealing short section (15). The locking sleeve (14), locking ring (12), sealing ring (13) and retaining ring (11) are installed from the inside out in the annular space between the sliding sealing short section (15), the lower working outer cylinder (7) and the lower connector (8). The locking ring (12) and the locking sleeve (14) are engaged by a toothed fastener. The retaining ring (11) and the sealing ring (13) are connected. The upper connector of the packer (26) under test, which is sleeved outside the central tube (18), is connected to the upper connecting connector (19). The lower connector of the packer (26) under test is connected to the oil pipe coupling (16).

2. The mechanical compression setting packer test apparatus as described in claim 1, characterized in that, The locking ring (12) is an open ring with a toothed buckle on its inner circle. The ring body of the locking ring (12) has a longitudinally penetrating straight groove or oblique groove. The locking ring (12) is fitted outside the lower outer circle of the lock sleeve (14) and is located in the annular space between the lower inner surface of the sealing ring (13) and the lower outer surface of the lock sleeve (14).

3. The mechanical compression setting packer test apparatus as described in claim 2, characterized in that, The upper outer circle of the lock sleeve (14) is provided with a toothed buckle and can cooperate with the toothed buckle of the lock ring (12). The lock sleeve (14) is installed below the limiting step on the lower part of the outer circle of the sliding sealing short section (15).

4. The mechanical compression setting packer test apparatus as described in claim 3, characterized in that, The sealing ring (13) is a non-uniform diameter cylindrical body and both the inner and outer circles of the upper body are provided with sealing elements. Below the step of the lower inner circle of the sealing ring (13) is the locking ring mounting cavity, in which the locking ring (12) can be installed.

5. The mechanical compression setting packer test apparatus as described in claim 4, characterized in that, The retaining ring (11) is a non-uniform diameter cylindrical body. The sealing ring (13) and the locking ring (12) can be installed in the inner annular space formed by the central hole of the retaining ring (11) and the upper ring body. The lower working outer cylinder (7) can be installed in the annular space between the upper ring body of the retaining ring (11) and the lower connector (8).

6. The mechanical compression setting packer test apparatus as described in claim 3, characterized in that, The sliding sealing short section (15) is a non-uniform diameter cylindrical body with a limiting step on its outer wall, and a locking sleeve (14) is installed below the limiting step; the upper part of the sliding sealing short section (15) is connected to the oil pipe coupling (16) by an oil pipe thread, and the lower part is connected to the locking sleeve pressure ring (9) by a thread. The internal threads at both ends of the oil pipe coupling (16) are oil pipe threads; the lower external thread of the upper connecting joint (19) is an oil pipe thread.

7. The mechanical compression setting packer test apparatus as described in claim 6, characterized in that, The lower part of the sealing end cap (3) is sequentially threaded to the upper connector (4), the upper working outer cylinder (5), the connecting sleeve (6), the lower working outer cylinder (7), and the lower connector (8); the upper part of the central tube (18) passes through the upper connecting connector (19) and is threaded to the piston rod (22); the oil pipe coupling (16) and the sliding sealing short section (15) are sleeved on the lower part of the central tube (18) and connected to the locking sleeve pressure ring (9). The sliding sealing short section (15) sits on top of the sealing short section pressure ring (10) which is threaded to the central tube (18).

8. The mechanical compression setting packer test apparatus as described in claim 7, characterized in that, After being connected to the upper connecting joint (19), the packer stabilizer (26-3) of the packer under test (26) is exposed outside the upper working outer cylinder (5); the inner circle of the connecting sleeve (6) and the outer circle of the packer stabilizer (26-3) are in clearance fit.

9. The mechanical compression setting packer test apparatus as described in claim 7, characterized in that, The upper connector (4) is a non-uniform diameter cylindrical body with internal threads at both the upper and lower ends. When the upper connector (4) is connected to the sealing end cap (3) and the upper working outer cylinder (5), the upper test port (20) corresponds exactly to the annulus formed by the sealing end cap (3), the upper connecting connector (19) and the packer under test (26). The upper test port (20), the unsealing pressure port (21) and the setting pressure port (25) are all sealing threaded holes.

10. A method of using the mechanical compression setting packer test apparatus according to any one of claims 1-9, characterized in that: Includes the following steps: A. Assemble the power hydraulic cylinder; B. Install the packer test device and the packer under test (26) and the packer slip (26-2) for anchoring the packer under test (26); C. Set the packer under test (26); D. Perform a pressure test on the packer sleeve (26-1) of the packer under test (26); E. Unseal the packer under test (26) in the packer test device.

11. The method of using the mechanical compression setting packer testing device as described in claim 10, characterized in that: The mechanical compression setting packer test device and the packer under test (26) installed therein are placed together in a constant temperature chamber, which can perform setting, pressure resistance and unsealing tests on the packer under test (26) under high temperature conditions.

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