Performance testing device and method of blowout preventer for high-temperature steam well operation under pressure

Abstract

The invention relates to a performance testing device and method for a blowout preventer for high-temperature steam well under-pressure operation, a heat insulation ring blowout preventer is arranged at a wellhead of a test well, and a center testing tubular column which is in contact with a rubber core of the heat insulation ring blowout preventer to generate friction penetrates into the heat insulation ring blowout preventer in a sliding manner; the driving device is connected with the central testing tubular column and used for driving the central testing tubular column to vertically act in the heat insulation ring blowout preventer, and a tension monitoring piece is arranged at the joint of the driving device and the central testing tubular column; the heating device simulates and provides wellhead high temperature; the pressure supply device simulates and provides high-temperature wellhead pressure; the temperature measuring module measures the wellhead temperature and the friction heat temperature between the central test tubular column and the rubber core; and the leakage measuring module is communicated with the upper pressure cavity of the rubber core and is used for measuring leaked liquid. Design indexes of a rubber core of the blowout preventer in a dynamic working condition environment of lifting or lowering a tubular column can be simulated and tested, and test data such as a dynamic friction force value, a dynamic friction leakage value, a dynamic friction surface temperature value and an environment temperature difference value of the blowout preventer can be obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum simulation experimental devices, and relates to a performance testing technology for high-temperature steam well pressure operation equipment, in particular to a performance testing device and method for a blowout preventer for high-temperature steam well pressure operation. Background Art

[0002] In conventional heavy oil thermal recovery processes, steam injection is usually used to reduce the viscosity of heavy oil in the formation to enhance the fluidity of the heavy oil, thereby extracting the oil from the formation. Usually, the steam injection method uses high-temperature and high-pressure hot steam for steam injection, and the steam injection temperature can reach up to 350°C and the steam injection pressure can reach 17MPa. High-temperature steam well pressure operation is an important mining process for reducing costs and increasing efficiency. However, due to the high wellhead pressure and high temperature, the risk of pressure operation is also relatively high. The dynamic sealing performance of the pressure operation equipment is a key factor in ensuring the smooth progress of high-temperature steam well pressure operation.

[0003] At present, according to the standard "GB / T20174-2019 Drilling and Production Equipment for Petroleum and Natural Gas Industry", the sealing test is mainly a hydrostatic strength test, and the rubber core sealing test is mainly to measure the maximum operating pressure when the three gates leak. It is not specified how to test the blowout preventer seal in the high temperature and high pressure environment of high temperature steam wells. In actual working conditions, since the leakage under the static pressure of pressurized operation cannot fully reflect the failure of the rubber core, it has no guiding significance for the user when formulating the construction plan. Therefore, it is urgent to develop a performance test device and a scientific test method for high temperature steam well pressurized blowout preventers to provide test data support for guiding the technical parameters and use conditions of the equipment. Summary of the invention

[0004] The present invention provides a performance testing device and method for a blowout preventer for high-temperature steam well pressure operation, which can simulate the design indexes of the blowout preventer rubber core under the dynamic working conditions of lifting or lowering a pipe string, and obtain test data such as the dynamic friction value, the dynamic friction leakage value, the dynamic friction surface temperature and the ambient temperature difference value of the blowout preventer, so as to provide support for the user to determine the technical parameters and use conditions of the equipment.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A performance testing device for a blowout preventer for high-temperature steam well pressure operation is provided with a test well, a pressure supply device, a driving device, a temperature measuring module, a heating device, and a leakage measuring module; a heat-insulating ring blowout preventer is arranged at the wellhead of the test well, and a central test pipe string which contacts with its rubber core and generates friction is slidably penetrated into the heat-insulating ring blowout preventer; the driving device is connected to the central test pipe string to drive the central test pipe string to move vertically in the heat-insulating ring blowout preventer, and a tension monitoring component is arranged at the connection between the driving device and the central test pipe string; the heating device is connected between the central test pipe string and the heat-insulating ring blowout preventer to simulate providing a high temperature at the wellhead; the pressure supply device is connected between the central test pipe string and the heat-insulating ring blowout preventer to simulate providing a high-temperature wellhead pressure; the temperature measuring module is used to measure the wellhead temperature and the friction heat temperature between the central test pipe string and the rubber core; the leakage measuring module is connected to the upper pressure chamber of the rubber core to measure the leakage liquid.

[0007] Furthermore, the driving device includes a hydraulic cylinder arranged in the test well, and a small hydraulic station connected to the hydraulic cylinder to provide power for it; the output shaft of the hydraulic cylinder is connected to the bottom end of the central test pipe column, and a tension sensor is provided at the connection between the two.

[0008] Furthermore, the central test pipe column includes two long oil pipes connected by a temperature measuring friction pair coupling, and the temperature measuring friction pair coupling is in contact with the rubber core; a plurality of temperature measuring sensor joints are provided on the top of the upper long oil pipe, and the temperature measuring sensor joints are connected to the temperature measuring friction pair coupling through temperature measuring lines, and the temperature measuring module is connected to the temperature measuring sensor joints; a tension sensing lug is provided at the bottom end of the lower long oil pipe, and the tension sensing lug is connected to the output shaft of the hydraulic cylinder, and the tension sensor is arranged on the tension sensing lug.

[0009] Furthermore, an outer tube is sleeved on the outside of the long oil pipe, and a temperature measuring wire protection tube is fixed between the outer tube and the long oil pipe by a spacer ring. The temperature measuring wire is placed in the temperature measuring wire protection tube, and the temperature measuring wire protection tube is sealed in the outer tube by a sealing pressure cap.

[0010] Furthermore, an upper measurement and control sealing assembly is installed at the connection between the top end of the thermal insulation ring blowout preventer and the central test pipe string through an upper flange, a temperature sensor is installed on the inner wall of the upper measurement and control sealing assembly, and the temperature sensor is connected to the temperature measuring module; a lower measurement and control sealing assembly is installed at the connection between the bottom end of the thermal insulation ring blowout preventer and the central test pipe string through a lower flange, the upper measurement and control sealing assembly has the same structure as the lower measurement and control sealing assembly, and is used for sealing between the central test pipe string and the thermal insulation ring blowout preventer.

[0011] Furthermore, the measurement and control sealing assembly includes a sealing shell with a hollow inner cavity, the outer wall of the sealing shell is connected to the insulating ring blowout preventer through a flange, a guide ring and a sealing ring are provided in the inner cavity of the sealing shell, and the guide ring and the sealing ring are separated by a separating ring; a pressure cover is installed at the top cavity of the sealing shell to press the guide ring, the separating ring and the sealing ring into the inner cavity of the sealing shell; a temperature sensor is connected to one side of the outer wall of the sealing shell, and a pressure transmitter is connected to the other side, and the temperature sensor and the pressure transmitter are respectively connected to the inner cavity of the sealing shell.

[0012] Furthermore, an outer wall of the sealing shell is connected with an external thread straight pipe joint, which is connected with a quick joint, and the quick joint is used to connect a flange, and a sealing gasket ring is provided between the sealing shell and the insulation ring blowout preventer.

[0013] Furthermore, the pressure supply device includes a pressure supply pipeline connected to the central test pipe string and the insulation ring blowout preventer, and the pressure supply pipeline is connected to the hydraulic module through a pressure supply pipeline connecting hole.

[0014] Furthermore, the heating device includes heating rods respectively arranged on the upper flange and the lower flange, and a temperature control module connected to the heating rods, wherein the heating rods are located between the central test pipe string and the insulation ring blowout preventer.

[0015] The present invention also provides a performance testing method for a blowout preventer for high-temperature steam wells under pressure. Using the above-mentioned device, a driving device drives a central test pipe string to move vertically in the thermal insulation ring blowout preventer, so that the central test pipe string and the rubber core produce contact friction, simulating the oil pipe tripping action; a heating device connected between the central test pipe string and the thermal insulation ring blowout preventer provides a high wellhead temperature, simulating the wellhead temperature of the thermal insulation ring blowout preventer under pressure; a pressure supply device connected between the central test pipe string and the thermal insulation ring blowout preventer provides pressure, simulating the thermal insulation ring blowout preventer under pressure. The wellhead pressure during pressure operation; the temperature measurement module measures the above-mentioned friction heat temperature T1 and the temperature T2 in the high-temperature wellhead, and calculates the temperature difference ΔT=T1-T2 as a parameter for judging the thermal deformation of the rubber core; the tension monitoring component measures the force of the driving device pushing and pulling the central test pipe string, that is, the friction force between the central test pipe string and the rubber core of the insulation ring blowout preventer overcome by the central test pipe string; the leakage measurement module measures the weight of the liquid leaked into the upper pressure chamber due to the working pressure of the lower pressure chamber of the rubber core as the central test pipe string reciprocates, as a parameter for judging whether the rubber core has failed.

[0016] The beneficial effects of the present invention include:

[0017] It is possible to simulate and test the design indicators of the blowout preventer rubber core under the dynamic working conditions of lifting or lowering the pipe string, and obtain the test data of key technical parameters that affect its performance, such as the dynamic friction force value, dynamic friction leakage value, dynamic friction surface temperature and ambient temperature difference value, etc., to help understand the performance and use of the blowout preventer, and provide support for users to determine the technical parameters and use conditions of the equipment. These test data can also be used to optimize the design and manufacture of the blowout preventer, improve its performance and service life, discover the design defects of the series mechanism of the opening and closing pressure chamber and the cooling circulation chamber of the thermal insulation annular rubber core, predict the service life of the rubber core, and make the best choice of the rubber core. The present invention can provide data support for the client to determine the use conditions and compile the operation instructions, and realize the safe and reliable entry of high-temperature pressure operation equipment into the site. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Schematic diagram of the overall structure of the testing device of the present invention;

[0019] Figure 2 : A schematic diagram of the front structure of the sealing measurement and control assembly of the present invention;

[0020] Figure 3 : A schematic diagram of the side structure of the sealing measurement and control assembly of the present invention;

[0021] Figure 4 : Schematic diagram of the central test column structure of the present invention.

[0022] In the figure: 1, rubber core; 2, temperature sensor; 3, heating rod; 4, upper measurement and control seal assembly; 5, lower measurement and control seal assembly; 6, insulation ring blowout preventer; 7, center test pipe string; 8, tension sensor; 9, hydraulic cylinder; 10, test well; 11, pressure supply pipeline connection hole; 12, lower flange; 13, upper flange; 14, male thread straight pipe joint; 15, copper gasket a; 16, quick connector; 17, sealing shell; 18, bolt; 19, flat washer ; 20. Standard spring washer; 21. Pressure cover; 22. Guide ring; 23. Sealing ring; 24. Separating ring; 25. Copper gasket b; 26. Temperature sensor; 27. Sealing gasket; 28. Pressure transmitter; 29. ​​Long oil pipe; 30. Tension sensor hanging ear; 31. Temperature measuring wire protection tube; 32. Spacer ring; 33. Temperature measuring friction pair coupling; 34. Outer tube; 35. Sealing pressure cap; 36. Temperature measuring sensor connector a; 37. Temperature measuring sensor connector b. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside" and "outside" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "a" and "b" are only used to distinguish components, and cannot be understood as indicating or implying relative importance.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Example 1

[0027] A performance test device for a blowout preventer for high-temperature steam wells under pressure operation can be used to simulate the design indicators of the rubber core of the blowout preventer when lifting or lowering the pipe string, and obtain test data such as the dynamic friction force value, the dynamic friction leakage value, the dynamic friction surface temperature and the ambient temperature difference value. It includes a test well, a central test pipe string, a pressure supply device, a drive device, a temperature measurement module, a heating device, and a leakage measurement module; wherein the pressure supply device, the heating device, and the drive device respectively simulate the system pressure, temperature, and the lifting and lowering action of the oil pipe of the insulation ring blowout preventer under pressure operation. Further, the drive device provides power to pull the central test pipe string to simulate the lowering and lifting of the oil pipe; the pressure supply device provides pressure for squeezing the rubber core 1 for the insulation ring blowout preventer 6 to simulate the actual high-temperature wellhead pressure; the heating device heats and controls the temperature of the heat-conducting medium in the high-temperature wellhead; the temperature measurement module is used to measure the ambient temperature in the wellhead, as well as the temperature of the heat generated by the friction between the up and down movement of the center pipe and the rubber core of the insulation ring blowout preventer 6.

[0028] Specifically, Figure 1 As shown, a test well 10 is set up, and a heat-insulating ring blowout preventer 6 is set up at the wellhead of the test well 10. A central test pipe string 7 in contact with its rubber core 1 is slidably penetrated into the heat-insulating ring blowout preventer 6; a hydraulic cylinder 9 is provided in the test well 10, and the hydraulic cylinder 9 is connected to a small hydraulic station for providing power therefor. The output shaft of the hydraulic cylinder 9 is connected to the bottom end of the central test pipe string 7, and a tension sensor 8 is provided at the connection between the two. The hydraulic cylinder 9 drives the central test pipe string 7 to move vertically in the heat-insulating ring blowout preventer 6, so that the central test pipe string 7 and the rubber core 1 generate contact friction, simulating the oil pipe tripping action;

[0029] An upper measurement and control sealing assembly 4 is installed at the connection between the top end of the thermal insulation ring blowout preventer 6 and the central test pipe string 7 through an upper flange 13. A temperature sensor 2 is installed on the inner wall of the upper measurement and control sealing assembly 4. The temperature sensor 2 is connected to the temperature measuring module to transmit the high-temperature wellhead temperature value to the temperature measuring module; a lower measurement and control sealing assembly 5 is installed at the connection between the bottom end of the thermal insulation ring blowout preventer 6 and the central test pipe string 7 through a lower flange 12. The upper measurement and control sealing assembly 4 has the same structure as the lower measurement and control sealing assembly 5, and is used for sealing between the central test pipe string 7 and the thermal insulation ring blowout preventer 6.

[0030] A heating device is connected between the central test string 7 and the insulation ring blowout preventer 6 to simulate providing high wellhead temperature; the heating device includes a heating rod 3 respectively arranged on the upper flange 13 and the lower flange 12, and a temperature control module connected to the heating rod 3, wherein the heating rod 3 is located between the central test string 7 and the insulation ring blowout preventer 6.

[0031] A pressure supply device is connected between the central test string 7 and the insulation ring blowout preventer 6 to simulate the provision of high-temperature wellhead pressure; the pressure supply device includes a pressure supply pipeline connected between the central test string 7 and the insulation ring blowout preventer 6, and the pressure supply pipeline is connected to the hydraulic module through the pressure supply pipeline connecting hole 11.

[0032] The upper pressure chamber formed between the rubber core 1 and the central test pipe column 7 is connected to a leakage module for measuring the leakage liquid.

[0033] like Figure 4 As shown, the central test pipe column 7 includes two sections of long oil pipes 29 connected by a temperature measuring friction pair coupling 33. The temperature measuring friction pair coupling 33 is in contact with the rubber core 1. It is made of high temperature resistant and wear-resistant materials, has wear resistance and temperature conductivity, and can accurately measure temperature under dynamic friction in a high temperature environment; a temperature measuring sensor joint a36 and a temperature measuring sensor joint b37 are provided on the top of the upper section of the long oil pipe 29, and the temperature measuring sensor joint a36 and the temperature measuring sensor joint b37 are each connected to the temperature measuring friction pair coupling 33 through a temperature measuring line, and the temperature measuring sensor joint a36 and the temperature measuring sensor joint b37 are both connected to the temperature measuring module to transfer the heat temperature of the contact friction between the temperature measuring friction pair coupling 33 and the rubber core 1 to the temperature measuring module; a tension sensor hanging ear 30 is provided at the bottom end of the lower section of the long oil pipe 29, and the tension sensor hanging ear 30 is connected to the output shaft of the hydraulic cylinder 9. The tension sensor 8 is arranged on the tension sensor hanging ear 30, and the tension sensor 8 can measure the tension value of the hydraulic cylinder in real time;

[0034] Preferably, in order to protect the temperature measuring line and prevent it from being affected and damaged by high temperature, an outer tube 34 is mounted on the outside of the long oil pipe 29, and a temperature measuring line protection tube 31 is fixed between the outer tube 34 and the long oil pipe 29 by a spacer ring 32. The temperature measuring line is placed in the temperature measuring line protection tube 31, and the temperature measuring line protection tube 31 is sealed in the outer tube 34 by a sealing pressure cap 35.

[0035] like Figure 2 , Figure 3 As shown, the measurement and control seal assembly includes a seal housing 17 with a hollow inner cavity, the outer wall of the seal housing 17 is connected to an external thread straight pipe joint 14, a copper gasket a15 is provided between the external thread straight pipe joint 14 and the seal housing 17, the external thread straight pipe joint 14 is connected to a quick connector 16, the quick connector 16 is used to connect the flange, and a sealing gasket ring 27 is provided between the seal housing 17 and the insulation ring blowout preventer 6; a guide ring 22 and a sealing ring 23 are provided in the inner cavity of the seal housing 17, and the guide ring 22 and the sealing ring 23 are separated by a separator ring 24; preferably, the guide ring 22 and the sealing ring 23 are both made of modified polytetrafluoroethylene; the top of the seal housing 17 A pressure cover 21 is installed at the cavity mouth through bolts 18 to press the guide ring 22, the separation ring 24, and the sealing ring 23 into the inner cavity of the sealed shell 17. A flat washer 19 and a standard spring washer 20 are provided between the pressure cover 21 and the bolts 18. Preferably, a temperature sensor 26 is connected to one side of the outer wall of the sealed shell 17, and a pressure transmitter 28 is connected to the other side. The temperature sensor 26 and the pressure transmitter 28 are respectively connected to the inner cavity of the sealed shell 17 to measure the pressure and temperature in the inner cavity of the sealed shell 17. A copper pad b25 is respectively provided between the pressure transmitter 28 and the sealed shell 17 and between the temperature sensor 26 and the sealed shell 17.

[0036] Based on the above implementation scheme, the performance testing method of the blowout preventer for high-temperature steam well pressure operation of the present invention includes:

[0037] The driving device drives the central test string 7 to move vertically in the thermal insulation ring blowout preventer 6, so that the temperature measuring friction pair coupling 33 and the rubber core 1 generate contact friction, simulating the oil pipe tripping action; the temperature control module controls the heating rod 3 to heat the medium between the central test string 7 and the thermal insulation ring blowout preventer 6, simulating the wellhead temperature of the thermal insulation ring blowout preventer when operating under pressure; the hydraulic module provides pressure between the central test string 7 and the thermal insulation ring blowout preventer 6 through the pressure supply pipeline, simulating the wellhead pressure of the thermal insulation ring blowout preventer when operating under pressure.

[0038] Measurement of temperature gradient on the friction contact surface of rubber core

[0039] The temperature measurement module measures the real-time temperature T1 of the friction heat on the surface of the rubber core 1 and the temperature T2 in the high-temperature wellhead, and calculates the temperature difference ΔT=T1-T2 as a parameter for judging the thermal deformation of the rubber core 1; the gradient temperature difference generated on the contact surface of the rubber core due to friction is an important parameter causing its thermal deformation.

[0040] Friction measurement

[0041] The tension sensor 8 measures the force of the hydraulic cylinder 9 pushing and pulling the central test pipe string 7, that is, the friction force between the temperature measuring friction pair coupling 33 and the rubber core 1 of the thermal insulation ring blowout preventer 6 overcome by the central test pipe string 7.

[0042] Leakage measurement

[0043] With the reciprocating motion of the central test string 7, a small amount of liquid will leak into the upper pressure chamber due to the certain working pressure of the lower pressure chamber of the rubber core 1. The leaked liquid is discharged into the measuring cup, and the weight is directly converted into volume. The change of the leakage amount per unit time of the insulation ring blowout preventer 6 when the pipe string is lifted and lowered can be measured, and a change curve can be drawn. When the leakage amount suddenly increases, it can be analyzed that the rubber core 1 has failed.

[0044] The above-mentioned temperature difference gradient measurement, leakage measurement and friction measurement of the rubber core friction contact surface are important parameters that affect the working performance of the thermal insulation ring blowout preventer under dynamic sealing conditions. The present invention simulates the working conditions of the thermal insulation ring blowout preventer for high-temperature steam well pressure operation to obtain relevant test data, and provides test data support for users to determine the technical parameters and use conditions of the equipment.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A performance testing device for a blowout preventer for high-temperature steam well pressure operation, characterized in that: A test well (10), a pressure supply device, a driving device, a temperature measurement module, a heating device, and a leakage measurement module are provided; a heat-insulating ring blowout preventer (6) is provided at the wellhead of the test well (10); a central test pipe string (7) which contacts with the rubber core (1) and generates friction is slidably inserted into the heat-insulating ring blowout preventer (6); the driving device is connected to the central test pipe string (7) to drive the central test pipe string (7) to move vertically in the heat-insulating ring blowout preventer (6); the driving device is connected to the central test pipe string (7) A tension monitoring component is provided at the joint; the heating device is connected between the central test pipe string (7) and the insulation ring blowout preventer (6) to simulate the provision of high wellhead temperature; the pressure supply device is connected between the central test pipe string (7) and the insulation ring blowout preventer (6) to simulate the provision of high-temperature wellhead pressure; the temperature measurement module is used to measure the wellhead temperature and the friction heat temperature between the central test pipe string (7) and the rubber core (1); the leakage measurement module is connected to the upper pressure chamber of the rubber core (1) to measure the leakage liquid.

2. The performance testing device for a blowout preventer for high-temperature steam well pressure operation according to claim 1, characterized in that: The driving device comprises a hydraulic cylinder (9) arranged in a test well (10), and a small hydraulic station connected to the hydraulic cylinder (9) for providing power thereto; the output shaft of the hydraulic cylinder (9) is connected to the bottom end of a central test pipe column (7), and a tension sensor (8) is provided at the connection between the two.

3. The performance testing device for a blowout preventer for high-temperature steam well pressure operation according to claim 2, characterized in that: The central test pipe column (7) comprises two sections of long oil pipe (29) connected by a temperature measuring friction pair coupling (33), wherein the temperature measuring friction pair coupling (33) is in contact with the rubber core (1); a plurality of temperature measuring sensing joints are arranged at the top of the upper section of the long oil pipe (29), the temperature measuring sensing joints are connected to the temperature measuring friction pair coupling (33) through temperature measuring lines, and the temperature measuring module is connected to the temperature measuring sensing joints; a tension sensing hanging ear (30) is arranged at the bottom end of the lower section of the long oil pipe (29), the tension sensing hanging ear (30) is connected to the output shaft of the hydraulic cylinder (9), and the tension sensor (8) is arranged on the tension sensing hanging ear (30).

4. The performance testing device for a blowout preventer for high-temperature steam well pressure operation according to claim 3, characterized in that: An outer tube (34) is sleeved on the outside of the long oil tube (29), a temperature measuring wire protection tube (31) is fixed between the outer tube (34) and the long oil tube (29) by a spacer ring (32), the temperature measuring wire is placed in the temperature measuring wire protection tube (31), and the temperature measuring wire protection tube (31) is sealed in the outer tube (34) by a sealing pressure cap (35).

5. The performance testing device for a blowout preventer for high-temperature steam well pressure operation according to claim 1, characterized in that: An upper measurement and control sealing assembly (4) is installed at the connection between the top end of the heat insulation ring blowout preventer (6) and the central test pipe column (7) through an upper flange (13), and a temperature sensor (2) is installed on the inner wall of the upper measurement and control sealing assembly (4), and the temperature sensor (2) is connected to the temperature measurement module; a lower measurement and control sealing assembly (5) is installed at the connection between the bottom end of the heat insulation ring blowout preventer (6) and the central test pipe column (7) through a lower flange (12), and the upper measurement and control sealing assembly (4) and the lower measurement and control sealing assembly (5) have the same structure and are used for sealing between the central test pipe column (7) and the heat insulation ring blowout preventer (6).

6. The performance testing device for a blowout preventer for high-temperature steam well pressure operation according to claim 5, characterized in that: The measurement and control seal assembly comprises a seal housing (17) having a hollow inner cavity. The outer wall of the seal housing (17) is connected to the heat-insulating ring blowout preventer (6) through a flange. A guide ring (22) and a seal ring (23) are arranged in the inner cavity of the seal housing (17). The guide ring (22) and the seal ring (23) are separated by a separator ring (24). A gland (21) is installed at the top cavity of the seal housing (17) to press the guide ring (22), the separator ring (24) and the seal ring (23) into the inner cavity of the seal housing (17). A temperature sensor (26) is connected to one side of the outer wall of the seal housing (17) and a pressure transmitter (28) is connected to the other side. The temperature sensor (26) and the pressure transmitter (28) are respectively connected to the inner cavity of the seal housing (17).

7. A performance testing device for a blowout preventer for high-temperature steam well pressure operation according to claim 6, characterized in that: The outer wall of the sealing shell (17) is connected with an external thread straight pipe joint (14), the external thread straight pipe joint (14) is connected with a quick joint (16), the quick joint (16) is used to connect a flange, and a sealing gasket (27) is provided between the sealing shell (17) and the heat insulation ring blowout preventer (6).

8. The performance testing device for a blowout preventer for high-temperature steam well pressure operation according to claim 1, characterized in that: The pressure supply device comprises a pressure supply pipeline connected to a central test pipe column (7) and an insulation ring blowout preventer (6), and the pressure supply pipeline is connected to a hydraulic module through a pressure supply pipeline connection hole (11).

9. The performance testing device for a blowout preventer for high-temperature steam well pressure operation according to claim 5, characterized in that: The heating device comprises heating rods (3) respectively arranged on an upper flange (13) and a lower flange (12), and a temperature control module connected to the heating rods (3), wherein the heating rods (3) are located between a central test pipe column (7) and an insulation ring blowout preventer (6).

10. A method for testing the performance of a blowout preventer for high-temperature steam well pressure operation, using the device according to any one of claims 1 to 9, characterized in that: The driving device drives the central test pipe string (7) to move vertically in the heat-insulating ring blowout preventer (6), so that the central test pipe string (7) and the rubber core (1) generate contact friction, simulating the oil pipe tripping action; the heating device connected between the central test pipe string (7) and the heat-insulating ring blowout preventer (6) provides a high wellhead temperature, simulating the wellhead temperature of the heat-insulating ring blowout preventer when operating under pressure; the pressure supply device connected between the central test pipe string (7) and the heat-insulating ring blowout preventer (6) provides pressure, simulating the wellhead pressure of the heat-insulating ring blowout preventer when operating under pressure; the temperature measurement module measures the above friction The friction heat temperature T1 and the temperature T2 in the high-temperature wellhead are used to calculate the temperature difference ΔT=T1-T2, which is used as a parameter for judging the thermal deformation of the rubber core (1); the tension monitoring component measures the force of the driving device pushing and pulling the central test pipe column (7), that is, the friction force between the central test pipe column (7) and the rubber core (1) of the insulation ring blowout preventer (6) overcome by the central test pipe column (7); the leakage measurement module measures the weight of the liquid leaked into the upper pressure chamber due to the working pressure of the lower pressure chamber of the rubber core (1) as the central test pipe column (7) reciprocates, which is used as a parameter for judging whether the rubber core (1) is invalid.

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