Sealing performance test system of O-shaped ring for high temperature and high pressure

Abstract

The invention discloses a sealing performance test system for a high-temperature and high-pressure O-shaped ring, which comprises a pressure container, a pressure cavity is formed in the pressure container, and an O-shaped ring test device is arranged in the pressure cavity; the O-ring testing device comprises O-ring sealing baffles, the O-ring sealing baffles divide a pressure cavity into a plurality of cavities, and loading shafts are arranged in the cavities; each cavity is connected with a pressure adjusting pipeline, and the unoccupied end of the pressure adjusting pipeline is connected with a pressure guide pipe of a pressure supply station; and a high-temperature drying oven is arranged outside the pressure container. According to the invention, the overall temperature and the pressure of each layer of cavity can be monitored, the supply pressure and the temperature value are adjusted through the set temperature and the pressure of each layer, the high-temperature and high-pressure working environment of the O-shaped ring in an oil field cabled intelligent water distributor can be simulated and reduced to the greatest extent, and meanwhile, the pressure container can accommodate a large number of sealing element samples with different specifications. According to the invention, the accuracy of test data can be improved, and the test performance is ensured to meet the requirements under real working conditions.

Description

Technical Field

[0001] The present invention relates to the field of sealing technology testing, and in particular to a sealing performance testing system for an O-ring used at high temperature and high pressure. Background Art

[0002] As the technology in the oil industry becomes increasingly mature, cabled intelligent water distributors are gradually being used in high-temperature and high-pressure working environments. As the main sealing element of water distributors, low-cost and stable-performance O-rings need to accurately reflect their service life and sealing performance in the working environment.

[0003] Currently, there are mainly the following types of testing devices for the sealing performance of sealing rings: Chinese utility model publication number CN214667637U discloses a performance testing device and testing system for sealing rings at low temperatures, which can test the performance of sealing rings of each structural form and determine which sealing rings have excessive leakage problems; Chinese utility model publication number CN220063666U discloses a performance testing device for the stretching and compression mechanism of O-rings; Chinese utility model publication number CN207318061U discloses a testing device for the sealing performance of sealing rings under high temperature and high pressure and evaluates the medium resistance of sealing rings; Chinese utility model publication number CN207036402U discloses a sealing ring performance testing device that detects oil leakage through a leakage sensor under working conditions such as the temperature and oil pressure of the engine oil circuit sealing ring.

[0004] However, the sealing performance test of the O-ring in the above-mentioned device system is carried out under normal temperature, high and low temperature, normal pressure and medium pressure conditions. The existing sealing performance methods and testing systems cannot realistically simulate harsh working conditions such as high pressure and high temperature in oil and water wells. In addition, the number of samples that can be accommodated by general O-ring sealing test devices is relatively small, so large-scale sample sealing experiments cannot be carried out. Summary of the Invention

[0005] To address the existing problem of insufficient simulation of harsh operating conditions, which affects the accuracy of actual sealing performance measurements, this invention provides a sealing performance testing system for high-temperature, high-pressure O-rings. This system utilizes an O-ring mounted on a metal device to simulate the various temperature and pressure conditions found in actual operating conditions. This system can perform large-scale, high-volume sealing performance tests on samples of varying sizes and materials.

[0006] The present invention is achieved by adopting the following technical solutions.

[0007] A sealing performance testing system for high-temperature and high-pressure O-rings includes a pressure vessel, a pressure cavity formed within the pressure vessel, and an O-ring testing device disposed within the pressure cavity. The O-ring testing device includes an O-ring sealing baffle that divides the pressure cavity into a plurality of cavities, with a loading shaft disposed within each cavity. Each cavity is connected to a pressure regulating pipe, the free end of which is connected to a pressure guide pipe of a pressure supply station. A high-temperature oven is disposed outside the pressure vessel.

[0008] Furthermore, the pressure vessel is provided with a cover plate, and the pressure vessel and the cover plate are connected by bolts.

[0009] Furthermore, the pressure regulating pipeline is provided with a pressure gauge and a manual pressure regulating valve.

[0010] Furthermore, the pressure supply station includes a pressure pump, and the pressure pipe of the pressure pump is provided with an emptying valve, a pressure holding valve, an overflow valve and a pressure gauge of the pressure supply station.

[0011] Furthermore, a pressure sensor is provided in the pressure regulating pipe, a temperature sensor is provided in the high-temperature oven, and the pressure sensor and the temperature sensor are connected to the temperature and pressure monitoring unit.

[0012] Furthermore, annular O-ring grooves of various specifications are formed on the outer wall of the loading shaft.

[0013] Furthermore, the pressure vessel is hoisted in the high-temperature oven through a support hanger.

[0014] This application has the following beneficial effects.

[0015] The present invention can conveniently adjust the temperature and pressure required for the experiment, and simulate and restore the usage status of the O-ring under actual working conditions to the greatest extent; at the same time, the present invention can accommodate a large number of O-ring samples of different specifications and materials, expanding the scale of the experiment and facilitating the testing of a large number of seals to obtain more accurate sealing performance test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the high-temperature oven of the present invention.

[0018] Figure 3 It is a top view of the support hanger of the present invention.

[0019] Among them, 1-pressure vessel; 2-high-temperature oven; 3-loading shaft; 4-one-layer O-ring sealing baffle; 5-two-layer O-ring sealing baffle; 6-pressure gauge; 7-pressure regulating pipe; 8-manual pressure regulating valve; 9-pressure sensor; 10-temperature sensor; 11-test through hole; 12-pressure supply station; 13-pressure gauge of pressure supply station; 14-overflow valve; 15-pressure holding valve; 16-pressure pump; 17-emptying valve; 18-high-temperature oven upper cover; 19-cover plate; 20-temperature and pressure monitoring unit; 21-alarm. DETAILED DESCRIPTION

[0020] like Figure 1-2 As shown, a high-temperature, high-pressure O-ring sealing performance testing system includes an adjustable pressure supply station 12, a pressure vessel 1, an adjustable temperature high-temperature oven 2, and an O-ring testing device. By adjusting the supply pressure and ambient temperature, the present invention closely simulates the high-temperature, high-pressure operating environment of O-rings, such as those found in oilfield cabled intelligent water distributors. Furthermore, the pressure vessel 1 can accommodate a large number of seal samples of varying specifications, thereby increasing the scale of the testing system.

[0021] Specifically, a pressure cavity is formed in the pressure vessel 1. A cover plate 19 is provided on the upper end surface of the pressure vessel 1. The pressure vessel 1 and the cover plate 19 are connected by bolts to seal the entire pressure cavity. Preferably, a sealing gasket is provided between the cover plate 19 and the pressure vessel 1 to improve the sealing performance of the entire pressure vessel 1. The cover plate 19 is provided with a plurality of drain holes for relieving the upper pressure inside the pressure vessel 1.

[0022] An O-ring test device is placed in the pressure chamber. The O-ring test device includes a loading shaft 3, a first-layer O-ring sealing baffle 4, and a second-layer O-ring sealing baffle 5. The edges of the first-layer O-ring sealing baffle 4 and the second-layer O-ring sealing baffle 5 are threaded and have a sealing structure. The first-layer O-ring sealing baffle 4 and the second-layer O-ring sealing baffle 5 are installed between the cavities via threads, which can divide the pressure chamber into three layers of sealed and isolated cavities, and the loading shaft 3 can be placed in each cavity. The outer wall of the loading shaft 3 is provided with several O-ring notches, and the O-rings are arranged in the O-ring notches of the loading shaft 3. The loading shaft 3 and the O-ring notches thereon of the present application have different specifications to meet various testing needs.

[0023] Pressure regulating pipes 7 are connected to the outside of each of the three chambers of pressure vessel 1. These pipes are equipped with pressure gauges 6 and manual pressure regulating valves 8. The pressure within each chamber is adjusted by opening and closing the manual pressure regulating valves 8. The unused ends of the three pressure regulating pipes 7 are connected to the pressure pipes of the pressure pumps 16 in the pressure supply station 12.

[0024] The high temperature oven 2 is located outside the pressure vessel 1. A high temperature oven cover 18 is provided on the high temperature oven 2. A test through hole 11 is formed on the side wall of the high temperature oven 2. The pressure pipe of the pressure station 12 passes through the test through hole 11 and is connected to the three pressure regulating pipes 7 outside the pressure vessel 1. In this application, a support hanger is also provided outside the pressure vessel 1. The support hanger can adopt any structure that can support and straighten the pressure vessel 1. Specifically, Figure 3 As shown, the support hanger includes a frame body, and a lifting lug is provided on the top layer of the frame body for lifting and installing the pressure vessel 1. The pressure vessel 1 is placed in the center area of ​​the support hanger by lifting, and then placed on the bottom surface of the high-temperature oven 2 after lifting.

[0025] The barrier formed between the high-temperature oven 2 and the pressure vessel 1 of the present application is a sealed cavity at normal pressure and temperature control, which is filled with gas, preferably air. The interior of the pressure vessel 1 forms a pressurizable pressure cavity, which is filled with pressurized liquid. The pressure supply station 12 regulates the pressure in the pressure vessel 1 via a pressure pump 16. The pressurized liquid can be oil or water, preferably water.

[0026] The pressure supply station 12 includes a pressure pump 16 , and a pressure pipe of the pressure pump 16 is provided with an exhaust valve 17 , a pressure holding valve 15 , an overflow valve 14 and a pressure gauge 13 of the pressure supply station in sequence.

[0027] The present application provides pressure sensors 9 in the three pressure regulating pipes 7 and temperature sensors 10 in the high-temperature oven 2. The pressure sensors 9 and the temperature sensors 10 are both connected to the temperature and pressure monitoring unit 20, which is also connected to the alarm 21. By adopting the above technical solution, the pressure of each layer and the temperature of the box can be monitored and controlled, and the data can be recorded and an alarm can be issued after an abnormality is found. Among them, the pressure sensor adopts a 24VDC power supply with a measurement range of 0-100MPa and a pressure transmitter with a 4-20mA output, model TFD-801A-M20*5-100M. The temperature sensor adopts PT100, a 4-20mA output temperature transmitter, and the temperature and pressure monitoring unit adopts the E740 series intelligent digital display.

[0028] The workflow of the present invention is as follows:

[0029] During operation, the O-ring to be tested is placed in the pressure vessel 1, and the first layer O-ring sealing baffle 4, the second layer O-ring sealing baffle 5 and the pressure vessel 1 are connected through threads and sealing rings. The pressure vessel 1 is hoisted and placed in the high-temperature oven 2, and the pressure pipe of the pressure pump 16 is connected to the pressure regulating pipe 7 of the three-layer cavity of the pressure vessel 1 respectively, and then the pressure pump 16 is used to fill water into the three-layer cavity of the pressure vessel 1; when the liquid level at the top of the pressure vessel 1 begins to discharge water, the pressure pump 16 is stopped, the pressure vessel 1 and the cover plate 19 are tightened with nuts, and then the inside of the pressure vessel 1 is pressurized, and the pressure gauge 13 and the pressure gauge 6 of the pressure supply station are observed in turn. After reaching the pressure of each layer of the cavity, the pressure valves of each branch pipeline are closed respectively. For example, the manual pressure regulating valve 8 is closed after the pressure of the first layer is reached, and the other layers are similar. When the pressure value of the three-layer cavity reaches the set experimental value, the value remains stable, that is, when there is no pressure leakage, the high-temperature oven cover 18 is closed to carry out the high-temperature test.

[0030] During the experiment, the pressure-holding valve 15 on the pressure pump 16 was opened to maintain the pressure within each layer of the pressure vessel 1 at a constant set value. As the pressure gradually increased with temperature, the relief valve 14 on the pressure pump 16 began to operate. After the temperature reached the set point, the relief valve 14 stopped operating for a long time, indicating that the pressure within the vessel was completely stable. At this point, the pressure-holding valve 15 was locked. The next step was to test the aging life and sealing performance of the O-rings. Pressure gauges 6, manual regulating valves 8, and pressure sensors 9 were installed on the three-layer cavity pipelines of the pressure vessel 1. An additional temperature sensor 10 was also installed inside the high-temperature oven 2. The three pressure sensors 9 and temperature sensor 10 were each connected to a temperature and pressure monitoring unit 20 via their own lines. The temperature and pressure monitoring unit 20 monitored the pressure within the three layers of the cavity and the oven temperature in real time. If a cross-pressure, pressure, or temperature anomaly was detected, an alarm 21 would be triggered.

[0031] The present invention can conveniently adjust the temperature and pressure required for the experiment, and simulate and restore the usage status of the O-ring under actual working conditions to the greatest extent; at the same time, the present invention can accommodate a large number of O-ring samples of different specifications and materials, expanding the scale of the experiment and facilitating the testing of a large number of seals to obtain more accurate sealing performance test results; in addition, the present invention provides a hanger on the outside of the pressure vessel, which facilitates experimental operation while ensuring structural stability.

[0032] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sealing performance testing system for high temperature and high pressure O-rings, characterized by: The invention comprises a pressure vessel (1), a pressure cavity is formed in the pressure vessel (1), and an O-ring test device is provided in the pressure cavity; the O-ring test device comprises an O-ring sealing baffle, which divides the pressure cavity into a plurality of cavities, and a loading shaft (3) is placed in the cavity; each cavity is connected to a pressure regulating pipe (7), and the free end of the pressure regulating pipe (7) is connected to a pressure guide pipe of a pressure supply station (12); and a high-temperature oven (2) is provided outside the pressure vessel (1).

2. The sealing performance testing system for high temperature and high pressure O-rings according to claim 1, characterized in that: The pressure container (1) is provided with a cover plate (19), and the pressure container (1) and the cover plate (19) are connected by bolts.

3. The sealing performance testing system for high temperature and high pressure O-rings according to claim 1, characterized in that: The pressure regulating pipe (7) is provided with a pressure gauge (6) and a manual pressure regulating valve (8).

4. The sealing performance testing system for high temperature and high pressure O-rings according to claim 1, characterized in that: The pressure supply station (12) comprises a pressure pump (16), and a pressure pipe of the pressure pump (16) is provided with an exhaust valve (17), a pressure holding valve (15), an overflow valve (14) and a pressure gauge (13) of the pressure supply station.

5. The sealing performance testing system for high temperature and high pressure O-rings according to claim 1, characterized in that: A pressure sensor (9) is provided in the pressure regulating pipe (7), a temperature sensor (10) is provided in the high-temperature oven (2), and the pressure sensor (9) and the temperature sensor (10) are connected to a temperature and pressure monitoring unit (20).

6. The sealing performance testing system for high temperature and high pressure O-rings according to claim 1, characterized in that: Annular O-ring grooves of various specifications are formed on the outer wall of the loading shaft (3).

7. The sealing performance testing system for high temperature and high pressure O-rings according to claim 1, characterized in that: The pressure vessel (1) is hoisted in the high-temperature oven (2) via a support hanger.

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