Ground simulation test device for a sealing cylinder

Abstract

The present application discloses a ground simulation test device for a sealing cylinder, which relates to the technical field of sealing. The device is used to test the sealing performance of the sealing cylinder under high temperature and high pressure conditions, and includes a support assembly, a downward pressing assembly, a test assembly and a heating sleeve. The support assembly is fixed to the ground and is used to support other components. The downward pressing assembly is installed on the upper part of the support assembly and is used to provide an axial force and uniformly act on the upper end surface of the sealing cylinder. The test assembly is installed on the lower part of the support assembly and is used to install the sealing cylinder, cooperate with the downward pressing assembly to achieve the setting of the sealing cylinder, and is used to pressurize the set sealing cylinder to test the sealing performance of the sealing cylinder under high pressure. The heating sleeve is installed outside the test assembly and is used to heat the test assembly to test the sealing performance of the sealing cylinder under high temperature. Through the above structure, the present application can test the sealing performance of the sealing cylinder under high temperature and high pressure conditions, thereby ensuring the ex-factory quality of the sealing cylinder.

Description

Technical Field

[0001] This application relates to the field of sealing technology, and particularly to a ground simulation test device for a sealing cylinder. Background Art

[0002] A sealing cylinder is a common sealing component used in industrial products, and is generally made of rubber-like materials. According to different application fields, the performance requirements for the sealing cylinder are also different. The following takes the sealing cylinder of a downhole tool packer as an example for illustration:

[0003] The sealing cylinder of the packer is a core component widely used in thermal recovery of heavy oil. During on-site use of the sealing cylinder of the packer, it should be flexible and reliable in setting and releasing, and under the action of the upper and lower pressure differences and high temperature, the sealing cylinder should have small deformation and strong continuous load-bearing capacity in order to achieve the purpose of sealing the annulus between the casing and the tubing and ensuring the smooth progress of the operation. Therefore, the sealing ability of the sealing cylinder in a high-temperature and high-pressure working environment is a key technical index for measuring the performance of the packer.

[0004] However, due to the lack of a test device for the sealing performance of the sealing cylinder under high-temperature and high-pressure conditions, it is impossible to effectively guarantee the ex-factory quality of the sealing cylinder of the packer, resulting in low anti-fatigue strength of the sealing cylinder of the packer. Under the action of high temperature and high pressure, the sealing cylinder is damaged in a short time, resulting in poor annulus sealing and sealing failure. Therefore, there is an urgent need to develop a test device for checking the sealing ability of the sealing cylinder under high-temperature and high-pressure conditions. Summary of the Invention

[0005] The purpose of this application is to overcome the above problems or at least partially solve or mitigate the above problems.

[0006] This application provides a ground simulation test device for a sealing cylinder, which is used to test the sealing performance of the sealing cylinder under high-temperature and high-pressure conditions, and includes:

[0007] A support assembly, fixed or placed on the ground, for supporting other components;

[0008] A downward pressure assembly, installed on the upper part of the support assembly, for providing an axial force and uniformly applying the axial force to the upper end surface of the sealing cylinder;

[0009] A test assembly, installed on the lower part of the support assembly, for installing the sealing cylinder, for cooperating with the downward pressure assembly to realize the setting of the sealing cylinder, and for pressurizing the seated sealing cylinder to test the sealing performance of the sealing cylinder under high pressure; and

[0010] A heating sleeve, installed outside the test assembly, for heating the test assembly to test the sealing performance of the sealing cylinder under high temperature.

[0011] Optionally, the support assembly includes:

[0012] A base for fixing or placing on the ground and serving as an installation foundation;

[0013] Two double-headed bolts horizontally stacked at the base and spaced apart from each other. Each end of each double-headed bolt is provided with a thread. One end of each double-headed bolt with a nut is used to pass through the base, and the other end of each double-headed bolt is used to pass through the pressing-down assembly;

[0014] Two adjusting nuts corresponding to the other ends of the two double-headed bolts for defining the height position of the support assembly.

[0015] Optionally, the pressing-down assembly includes:

[0016] An upper pressing plate fixedly installed at the support assembly for providing a reaction force. Two spaced-apart holes are provided in the upper pressing plate. Each hole penetrates axially along the upper pressing plate, and a nut is fixedly connected to each hole correspondingly;

[0017] A pressing plate located below the upper pressing plate and movable upward or downward relative to the upper pressing plate under an external force for transmitting the reaction force. A through-hole for the pressing plate penetrating axially is provided at the center of the pressing plate;

[0018] Two setscrews for correspondingly passing through the two holes of the upper pressing plate and engaging with the corresponding nuts therein to abut against the pressing plate;

[0019] A piston cylinder having a radially penetrating interface for connecting to an external pressure source assembly to input pressurized fluid into the piston cylinder. The piston cylinder has a piston rod for transmitting pressure;

[0020] A first bushing located below the piston cylinder and installed on the test assembly for uniformly applying the axial force to the upper end face of the sealing cylinder; and

[0021] A press pin accommodated in the through-hole for the pressing plate and fixedly connected to the piston rod, movable up and down along the through-hole for the pressing plate to abut against the upper pressing plate, causing it to generate a reaction force, prompting the piston cylinder to drive the first bushing to move downward to compress the sealing cylinder, so that the sealing cylinder fits with the test assembly to achieve seat sealing.

[0022] Optionally, the external pressure source assembly includes a hydraulic press and a steel pipe. One end of the steel pipe is connected to the hydraulic press, and the other end of the steel pipe is connected to the interface of the piston cylinder. A needle valve, a ball valve and a pressure gauge are arranged on the steel pipe in the fluid transmission direction.

[0023] Optionally, the pressing component further includes a pressure sensor located below the pressing plate to monitor the magnitude of the axial force of the pressing component. A sensor through-hole penetrating axially is provided at the center of the pressure sensor to accommodate the pressing pin.

[0024] Optionally, the testing component includes:

[0025] A sealing sleeve, which is a barrel body with an open top and a sealed bottom, used to accommodate the sealing cylinder to test the sealing performance of the sealing cylinder; and

[0026] A vertical shaft fixedly connected to the bottom of the sealing sleeve. The vertical shaft is coaxially installed with the sealing cylinder. An annular cavity is formed between the outer wall of the vertical shaft and the inner wall of the sealing sleeve. The vertical shaft is used to install the sealing cylinder and the pressing component. The vertical shaft has a boss for defining the axial position of the sealing cylinder;

[0027] Wherein, the pressing component generates an axial force to compress the sealing cylinder downward. The sealing cylinder is deformed under pressure so that its radial dimension increases and contacts the inner wall of the sealing sleeve, thereby forming an annular seal to achieve setting. An interface is connected to the position near the bottom of the sealing sleeve. The interface communicates with the annular cavity and is used to connect an external pressure source component to input pressurized fluid into the sealing cavity.

[0028] Optionally, the fixed connection between the sealing sleeve and the vertical shaft is a threaded connection.

[0029] Optionally, the external pressure source component includes a hydraulic press and a steel pipe. One end of the steel pipe is connected to the hydraulic press, and the other end of the steel pipe is connected to the interface of the sealing sleeve. An overflow safety valve, a needle valve, a ball valve and a pressure gauge are arranged on the steel pipe in the fluid transportation direction. The overflow safety valve is used to ensure that the pressure in the annular cavity does not exceed the set value.

[0030] Optionally, the ground simulation test device further includes an elastic force compensation component, which is arranged above or below the sealing cylinder and installed at the testing component, and is used to perform elastic compensation for the elastic decline of the sealing cylinder at high temperature to ensure that the seal of the sealing cylinder does not fail at high temperature.

[0031] Optionally, the testing component includes a sealing sleeve and a vertical shaft. The vertical shaft has a boss. The elastic force compensation component is arranged below the sealing cylinder. The elastic force compensation component includes a second pressing sleeve and a disc spring sequentially stacked below the sealing cylinder. The upper end and the lower end of the second pressing sleeve are respectively used to abut against the corresponding sealing cylinder and the disc spring to prevent the disc spring from directly contacting the sealing cylinder; both the second pressing sleeve and the disc spring are sleeved outside the vertical shaft, and the axial position of the disc spring is limited by the boss.

[0032] Optionally, the test assembly includes a sealing sleeve and a vertical shaft, the downward pressing assembly includes a piston cylinder, the elastic force compensation assembly is arranged above the sealing cylinder, the elastic force compensation assembly includes a guide sleeve and a disc spring stacked above the sealing cylinder, the guide sleeve is sleeved outside the vertical shaft, the disc spring is sleeved outside the guide sleeve, and the disc spring is also used to support the piston.

[0033] The ground simulation test device of the present application installs the device on the ground through the support assembly, provides an axial force through the downward pressing assembly, realizes the setting of the sealing cylinder through the cooperation of the downward pressing assembly and the test assembly, pressurizes the set sealing cylinder through the test assembly to realize the performance test of the sealing cylinder under high pressure conditions, heats the test assembly through the heating sleeve to simulate the downhole high-temperature environment, and tests the sealing performance of the sealing cylinder under high temperature and high pressure, thereby ensuring the ex-factory quality of the sealing cylinder.

[0034] Those skilled in the art will become more apparent about the above and other objects, advantages and features of the present application from the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Description of the Drawings

[0035] Some specific embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0036] Figure 1 is a schematic structural diagram of a ground simulation test device for a sealing cylinder according to an embodiment of the present application;

[0037] Figure 2 is a schematic structural diagram of a ground simulation test device for a sealing cylinder according to another embodiment of the present application;

[0038] Figure 3 is a schematic diagram of the position of the annular cavity formed between the outer wall of the vertical shaft and the inner wall of the sealing sleeve involved in the present application.

[0039] The meanings of the symbols in the drawings are as follows:

[0040] A support assembly, B downward pressing assembly, C test assembly, D annular cavity,

[0041] 1 ball valve, 2 pressure gauge, 3 base, 4 vertical shaft, 5 disc spring, 6 first compression sleeve, 7 sealing cylinder, 8 pressure sensor, 9 pressing plate, 10 double-headed bolt, 11 setscrew, 12 adjusting nut, 13 upper pressing plate, 14 press pin, 15 piston cylinder, 16 second compression sleeve, 17 heating sleeve, 18 sealing sleeve, 19 overflow safety valve, 20 needle valve, 21 steel pipe, 22 guide sleeve. Detailed implementation mode

[0042] Figure 1 It is a schematic structural diagram of a ground simulation test device for a sealing cylinder according to an embodiment of the present application. A ground simulation test device for a sealing cylinder, used to test the sealing performance of the sealing cylinder 7 under high temperature and high pressure conditions, generally may include: a support assembly A, a downward pressure assembly B, a test assembly C, and a heating sleeve 17. Among them, the support assembly A is fixed or placed on the ground and is used to support other components. The downward pressure assembly B is installed on the upper part of the support assembly A and is used to provide an axial force and make the axial force act uniformly on the upper end face of the sealing cylinder 7. The test assembly C is installed on the lower part of the support assembly A and is used to install the sealing cylinder 7, cooperate with the downward pressure assembly B to realize the setting of the sealing cylinder 7, and is used to pressurize the set sealing cylinder 7 to test the sealing performance of the sealing cylinder 7 under high pressure. The heating sleeve 17 is installed outside the test assembly C and is used to heat the test assembly C to simulate the oil well temperature to test the sealing performance of the sealing cylinder 7 under high temperature.

[0043] The ground simulation test device of the present application installs the device on the ground through the support assembly A, provides an axial force through the downward pressure assembly B, realizes the setting of the sealing cylinder 7 through the cooperation of the downward pressure assembly B and the test assembly C, pressurizes the set sealing cylinder 7 through the test assembly C, and the pressure can be, for example, 22 MPa during specific implementation to realize the performance test of the sealing cylinder 7 under high pressure conditions. The heating sleeve 17 heats the test assembly C to simulate the downhole high temperature environment. For example, the sealing performance of the sealing cylinder 7 under high temperature and high pressure at a temperature of 350 °C and a pressure of 22 MPa can be detected. Therefore, the present application simulates the working state of the sealing cylinder of the packer underground to test various main technical indicators of the sealing cylinder 7 under the action of high temperature and high pressure, thereby ensuring the use quality of the sealing cylinder 7 when leaving the factory.

[0044] In this embodiment, the support assembly A generally may include: a base 3, two double-headed bolts 10, and two adjusting nuts 12. The base 3 is used to be fixed or placed on the ground and serves as an installation foundation. The two double-headed bolts 10 are horizontally stacked at the base 3 and the two double-headed bolts 10 are arranged at intervals. Threads are correspondingly provided at both ends of each double-headed bolt 10. One end of each double-headed bolt 10 with a nut is used to pass through the base 3, and the other end of each double-headed bolt 10 is used to pass through the downward pressure assembly B. The two adjusting nuts 12 correspond to the other ends of the two double-headed bolts 10 and are used to limit the height position of the support assembly A.

[0045] In this embodiment, the downward pressing component B generally may include: an upper pressing plate 13, two setscrews 11, a piston cylinder 15, a first bushing 6, and a press pin 14. Among them, the upper pressing plate 13 is fixedly installed at the support component A to provide a reaction force. There are two holes (not shown in the figure) arranged at intervals in the upper pressing plate 13, each hole penetrating axially along the upper pressing plate 13, and a nut (not shown in the figure) is fixedly connected in each hole. The pressing plate 9 is located below the upper pressing plate 13 and can move up or down relative to the upper pressing plate 13 under an external force to transmit the reaction force. A through-hole penetrating axially is provided at the center of the pressing plate 9. The two setscrews 11 are used to pass through the two holes of the upper pressing plate 13 and engage with the corresponding nuts therein to abut against the pressing plate 9. The piston cylinder 15 has a radially penetrating interface for connecting an external pressure source assembly to input pressurized fluid into the piston cylinder 15. The piston cylinder 15 has a piston rod for transmitting pressure. Further, the external pressure source assembly at the piston cylinder 15 includes a hydraulic press (not shown in the figure) and a steel pipe. One end of the steel pipe is connected to the hydraulic press, and the other end of the steel pipe is connected to the interface of the piston cylinder 15. A needle valve 20, a ball valve 1, and a pressure gauge 2 are arranged on the steel pipe in the fluid transmission direction. The needle valve 20 and the ball valve 1 are used to control the fluid volume, and the pressure gauge 2 is used to detect the pressure of the fluid. The first bushing 6 is located below the piston cylinder 15 and is installed on the test component C to uniformly apply the axial force to the upper end face of the sealing cylinder 7. The press pin 14 is accommodated in the through-hole of the pressing plate, is fixedly connected to the piston rod, and can move up and down along the through-hole of the pressing plate to abut against the upper pressing plate 13, causing it to generate a reaction force, prompting the piston cylinder 15 to drive the first bushing 6 to move downward to compress the sealing cylinder 7, and making the sealing cylinder 7 fit with the test component C to achieve setting.

[0046] Further, in this embodiment, the downward pressing component B further includes a pressure sensor 8. The pressure sensor 8 is located below the pressing plate 9, that is, in contact with the lower surface of the pressing plate 9 and the upper surface of the piston cylinder 15 respectively, to monitor the magnitude of the axial force of the downward pressing component B, and thus the magnitude of the axial force (setting force) can be remotely and intuitively monitored. Specifically, when implemented, the pressure sensor 8 can be a spoke-type weighing pressure sensor.

[0047] A through-hole penetrating axially is provided at the center of the pressure sensor 8 to accommodate the press pin 14. The press pin 14 moves within the through-hole of the sensor and the through-hole of the pressing plate.

[0048] Figure 3 It is a schematic diagram of the position of the annular cavity formed between the outer wall of the vertical shaft and the inner wall of the sealing sleeve involved in the present application. As shown in this embodiment Figure 1 shown, reference can also be made to Figure 3The test assembly C includes: a sealing sleeve 18 and a vertical shaft 4. The sealing sleeve 18 is a barrel with an open top and a sealed bottom, which is used to accommodate the sealing cylinder 7 to test the sealing performance of the sealing cylinder 7. The vertical shaft 4 is fixedly connected to the bottom of the sealing sleeve 18, and the vertical shaft 4 is coaxially installed with the sealing sleeve 18. Figure 3 As shown, an annular cavity D is formed between the outer wall of the vertical shaft 4 and the inner wall of the sealing sleeve 18. The vertical shaft 4 is used to install the sealing cylinder 7 and the downward pressure assembly B. The vertical shaft 4 has a boss for limiting the axial position of the sealing cylinder 7. The downward pressure assembly B generates an axial force, compressing the sealing cylinder 7 downward. The sealing cylinder 7 is deformed under pressure, causing its radial dimension to increase and contact the inner wall of the sealing sleeve 18, thereby sealing a portion of the annular cavity D and achieving a seated seal. The sealing sleeve 18 is connected to an interface near the bottom position, which is connected to the annular cavity D. The interface is used to connect to an external pressure source assembly to input pressurized fluid into the annular cavity D to generate the high pressure described in high temperature and high pressure testing. In this embodiment, the external pressure source assembly at the sealing sleeve 18 includes a hydraulic press and a steel pipe 21. One end of the steel pipe 21 is connected to the hydraulic press, and the other end of the steel pipe 21 is connected to the interface of the sealing sleeve 18. An overflow safety valve 19, a needle valve 20, a ball valve 1 and a pressure gauge 2 are provided on the steel pipe 21 according to the fluid delivery direction. The overflow safety valve 19 is used to ensure that the pressure of the sealing chamber does not exceed the set value. The needle valve 20 and the ball valve 1 are used to control the fluid volume, and the pressure gauge 2 is used to display the fluid pressure.

[0049] Furthermore, in this embodiment, the heating sleeve 17 contacts the outer surface of the sealing sleeve 18. The sealing sleeve 18 is fixedly connected to the vertical shaft 4 via a threaded connection. The sealing sleeve 7 is sleeved onto the vertical shaft 4, and the first pressing sleeve 6 is sleeved onto the vertical shaft 4. The first pressing sleeve 6 supports the piston cylinder 15. The pressing pin 14 is fixedly connected to the piston rod of the piston cylinder 15. The pressure sensor 8 and the pressing plate 9 are sleeved onto the pressing pin 14. The upper pressing plate 13 is mounted on the stud 10. The stud 10 and the adjusting nut 12 restrict the upper pressing plate 13 from axial movement.

[0050] Since the elasticity of the sealing sleeve 18 in the packer at high temperature is lower than that at normal temperature, in order to ensure that the sealing of the sealing sleeve 7 does not fail at high temperature, certain compensation measures are required to ensure that the sealing of the sealing sleeve 7 does not fail.

[0051] Based on this, in this embodiment, the ground simulation test device also includes an elastic force compensation component, which is arranged above or below the sealing cylinder 7 and installed at the test component C to ensure that the sealing of the sealing cylinder 7 does not fail at high temperatures.

[0052] More specifically, in this embodiment, the elastic force compensation component is arranged below the sealing cylinder 7. The elastic force compensation component includes a second compression sleeve 16 and a disc spring 5 that are sequentially stacked below the sealing cylinder 7. The upper end of the second compression sleeve 16 is used to abut against the sealing cylinder 7, and the lower end of the second compression sleeve 16 is used to abut against the disc spring 5 to prevent the disc spring 5 from directly contacting the sealing cylinder 7. This is because the disc spring 5 itself has a bowl-shaped structure and generates deformation and energy storage under pressure. On the one hand, the contact area between the disc spring 5 and the sealing cylinder 7 is small and easy to cut the sealing cylinder 7. On the other hand, the large deformation of the disc spring 5 itself will drive the sealing cylinder 7 to deform radially outward greatly, resulting in a gap between the sealing cylinder 7 and the vertical shaft 4 and sealing failure. The second compression sleeve 16 and the disc spring 5 are both sleeved outside the vertical shaft 4, and the axial position of the disc spring 5 is limited by the convex platform. In this embodiment, the rebound performance of the compressed disc spring 5 can effectively make up for the adverse impact on the sealing performance caused by the decrease in the elasticity of the sealing cylinder 7 at high temperature, thereby ensuring that the sealing of the sealing cylinder 7 does not fail at high temperature.

[0053] Further, in this embodiment, the disc spring 5 contacts the convex platform of the vertical shaft 4 and the second compression sleeve 16.

[0054] As Figure 1 shown, in this embodiment, the ground simulation test device of the present application is a test device used to simulate the sealing effect of the sealing cylinder 7 of the downhole packer in the oilfield under high temperature, high pressure, and setting working conditions. The working process of the ground simulation test device is as follows:

[0055] Setting process: Pressurize the piston cylinder 15 supported on the first compression sleeve 6 through the hydraulic press at the piston cylinder 15, so that the piston rod of the piston cylinder 15 moves upward, driving the pressure pin 14 connected thereto to move upward. The pressure pin 14 moves upward and abuts against the lower surface of the upper pressure plate 13. According to the action and reaction forces, the piston cylinder 15 is prompted to drive the first compression sleeve 6 to move downward. When the pressure of the pressure gauge 2 at the piston cylinder 15 reaches 15 MPa (at this time, the setting force reaches 35 tons), close the ball valve 1 and the needle valve 20. Due to the action of the axial pressure, the radial diameter size of the sealing cylinder 7 increases, and the outer wall of the sealing cylinder 7 contacts the inner wall of the sealing sleeve 18, thereby achieving an annulus seal. This process is also called setting. Among them, after the piston cylinder 15 is depressurized, within the distance limited by the setscrew 11, the setting force is composed of the force of the setscrew 11 against the pressure plate 9 and the force exerted by the disc spring 5. When the elasticity of the sealing cylinder 7 decreases, the disc spring 5 compensates to maintain the dynamic balance of the setting force. The pressure pin 14 contacts the upper pressure plate 13 and the piston rod during operation.

[0056] Sealing performance detection process of the cold test of the ground simulation device: After setting, to test the sealing effect of the sealing cylinder 7, through the hydraulic press at the sealing sleeve 18 to Figure 3Inject high-pressure water into the lower half of the annular cavity D. After reaching the required working pressure, for example, 22 MPa, close the ball valve 1 and the needle valve 20 at the sealing sleeve 18. By observing the change value of the pressure gauge 2 at the sealing sleeve 18, the sealing effect of the sealing cylinder 7 can be judged.

[0057] Sealing performance test of the ground simulation device under high temperature and high pressure: The high temperature required during the hot test can be achieved through the heating jacket 17. For example, heat the water temperature in the annular cavity D to 350 °C. During the heating process, control the pressure at 22 MPa through the overflow safety valve 19. When the temperature of the bottom annular cavity D is maintained at 350 °C and the pressure is kept at 22 MPa, the test time can be, for example, maintained for 30 days as required. During this period, if the temperature remains unchanged and the pressure does not drop or the decrease value is not greater than the rated value, it can be considered that the sealing cylinder 7 meets the standard requirements of no leakage under high temperature and high pressure and the test ends. Among them, to reduce the change of the setting force of the sealing cylinder 7 after setting downhole, the compensation force of the compressed disc spring 5 is transmitted to the lower part of the sealing cylinder 7 through the second compression sleeve 16, so as to maintain the setting force basically unchanged.

[0058] Figure 2 is a schematic structural diagram of a ground simulation test device for a sealing cylinder according to another embodiment of the present application. The difference between this embodiment and Figure 1 the embodiment shown lies in the structure and installation position of the elastic force compensation component. In this embodiment, the sealing cylinder 7 is sleeved outside the vertical shaft 4 and positioned by the boss of the vertical shaft 4. The first compression sleeve 6 is located above the sealing cylinder 7 and sleeved on the vertical shaft 4.

[0059] In this embodiment, the elastic force compensation component is arranged above the sealing cylinder 7 and on the first compression sleeve 6. The elastic force compensation component includes a guide sleeve 22 for guiding the disc spring 5 and the disc spring 5 stacked above the sealing cylinder 7. The guide sleeve 22 is sleeved outside the vertical shaft 4 and connected to the piston cylinder 15. The disc spring 5 is sleeved outside the guide sleeve 22, and the disc spring 5 is also used to support the piston. In this embodiment, the rebound performance of the compressed disc spring 5 can effectively make up for the adverse impact on the sealing performance caused by the elastic decline of the sealing cylinder 7 at high temperature, so as to ensure that the sealing of the sealing cylinder 7 does not fail at high temperature.

[0060] In this embodiment, the downward pressing component B further includes an elastic force compensation component.

[0061] The working process of this embodiment:

[0062] Setting process: Through the hydraulic press at the piston cylinder 15, pressure is applied to the piston cylinder 15 supported on the disc spring 5, causing the piston rod of the piston cylinder 15 to move upward, driving the pin 14 connected to the piston rod to move upward. The pin 14 pushes upward under the lower surface of the upper pressure plate 13, prompting the piston cylinder 15 to drive the disc spring 5 and the first compression sleeve 6 to move downward, compressing the sealing cylinder 7 downward. When the pressure of the pressure gauge 2 reaches 15 MPa (at this time, the setting force reaches 35 tons), the ball valve 1 and the needle valve 20 at the piston cylinder 15 are closed. Due to the action of the axial pressure, the radial diameter of the sealing cylinder 7 increases and contacts the inner wall of the sealing sleeve 18, thus achieving the annulus sealing effect. This process is also called setting.

[0063] Sealing performance detection of the cold test of the ground simulation device: After setting is completed, to test the annulus sealing effect of the sealing cylinder 7, high-pressure water is injected into the annulus cavity D through the water injection machine at the sealing sleeve 18. After reaching the required working pressure of 22 MPa, the ball valve 1 and the needle valve 20 are closed, and the sealing effect can be intuitively judged by the change value of the pressure gauge 2 at the sealing sleeve 18.

[0064] Sealing performance test of the ground simulation device under high temperature and high pressure: The high temperature required during the hot test can be achieved through the heating sleeve 17. For example, the water temperature in the annulus cavity D is heated to 350 °C. During the heating process, the pressure is controlled at 22 MPa through the overflow safety valve 19. When the temperature in the bottom sealing cavity is maintained at 350 °C and the pressure is maintained at 22 MPa, the test time needs to be maintained for 30 days. If the temperature remains unchanged during this period, and if the pressure remains unchanged or the decrease value is not greater than the rated value, it can be considered that the sealing cylinder 7 meets the standard requirements of no leakage under high temperature and high pressure, and the test ends. Among them, to reduce the change of the setting force of the sealing cylinder 7 after setting downhole, under the action of the downward pressure, the disc spring 5 is axially compressed under the guidance of the guide sleeve 22. The compensation force of the compressed disc spring 5 is transmitted to the upper part of the sealing cylinder 7 through the first compression sleeve 6, so as to maintain the setting force basically unchanged.

[0065] In addition, the ground simulation test device of the present application can also be used for the differential pressure test, fatigue test, and packer release tension test of the sealing cylinder 7. The above test methods are not described in detail in this embodiment.

[0066] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A ground simulation test device for a sealing cylinder, which is used to test the sealing performance of the sealing cylinder under high temperature and high pressure conditions, is characterized in that Comprising: A support assembly, fixed or placed on the ground, for supporting other components; A downward pressing assembly, installed on the upper part of the support assembly, for providing an axial force and uniformly applying the axial force to the upper end face of the sealing cylinder; A testing assembly, installed on the lower part of the support assembly, for installing the sealing cylinder, for cooperating with the downward pressing assembly to seat the sealing cylinder, and for pressurizing the seated sealing cylinder to test the sealing performance of the sealing cylinder under high pressure; And A heating sleeve, installed outside the testing assembly, for heating the testing assembly to test the sealing performance of the sealing cylinder at high temperature; The support assembly includes: A base, for being fixed or placed on the ground, serving as an installation foundation; Two stud bolts, horizontally stacked at the base and spaced apart from each other. Each end of each stud bolt is correspondingly provided with threads. One end of each stud bolt with a nut is used to pass through the base, and the other end of each stud bolt is used to pass through the downward pressing assembly; Two adjusting nuts, corresponding to the other ends of the two stud bolts, for defining the height position of the support assembly; The downward pressing assembly includes: An upper pressure plate, fixedly installed at the support assembly, for providing a reaction force. Two spaced holes are provided in the upper pressure plate. Each hole penetrates axially along the upper pressure plate, and a nut is fixedly connected correspondingly in each hole; A pressure plate, located below the upper pressure plate, capable of moving up or down relative to the upper pressure plate under an external force, for transmitting the reaction force. A through-hole axially penetrating is provided at the center of the pressure plate; Two setscrews, for correspondingly passing through the two holes of the upper pressure plate and meshing with the corresponding nuts therein to abut against the pressure plate; A piston cylinder, having a radially penetrating interface for connecting an external pressure source assembly to input pressurized fluid into the piston cylinder, and having a piston rod for transmitting pressure; A first pressure sleeve, located below the piston cylinder and installed on the testing assembly, for uniformly applying the axial force to the upper end face of the sealing cylinder; and A pressure pin, accommodated in the through-hole of the pressure plate, fixedly connected to the piston rod, capable of moving up and down along the through-hole of the pressure plate to abut against the upper pressure plate, causing it to generate a reaction force, prompting the piston cylinder to drive the first pressure sleeve to move downward to compress the sealing cylinder, so that the sealing cylinder fits with the testing assembly to achieve seating; The testing assembly includes: A sealing sleeve, which is a barrel body with an open top and a sealed bottom, for accommodating the sealing cylinder to test the sealing performance of the sealing cylinder; and A vertical shaft, fixedly connected to the bottom of the sealing sleeve, coaxially installed with the sealing sleeve. A ring cavity is formed between the outer wall of the vertical shaft and the inner wall of the sealing sleeve. The vertical shaft is used to install the sealing cylinder and the downward pressing assembly. The vertical shaft has a boss for defining the axial position of the sealing cylinder; Among them, the pressing-down component generates an axial force to compress the sealing cylinder downward. The sealing cylinder is deformed under pressure, causing its radial dimension to increase and contact the inner wall of the sealing sleeve, thereby forming an annulus seal to achieve setting. An interface is connected to the position near the bottom of the sealing sleeve. The interface communicates with the annulus cavity and is used to connect an external pressure source component to input pressurized fluid into the sealing cavity. Among them, the external pressure source component includes a hydraulic press and a steel pipe. One end of the steel pipe is connected to the hydraulic press, and the other end is connected to the interface of the sealing sleeve. An overflow safety valve, a needle valve, a ball valve, and a pressure gauge are arranged on the steel pipe in the fluid transportation direction. The overflow safety valve is used to ensure that the pressure in the annulus cavity does not exceed the set value.

2. The ground simulation test device according to claim 1, characterized in that, The pressing-down component further includes a pressure sensor located below the pressing plate to monitor the magnitude of the axial force of the pressing-down component. A sensor through hole penetrating axially is provided at the center of the pressure sensor to accommodate the pressing pin.

3. The ground simulation test device according to claim 1 or 2, characterized in that, An elastic force compensation component is further included, which is arranged above or below the sealing cylinder and installed at the test component. It is used to perform elastic compensation for the elastic decline of the sealing cylinder at high temperatures to ensure that the seal of the sealing cylinder does not fail at high temperatures.

4. The ground simulation test device according to claim 3, characterized in that, The test component includes a sealing sleeve and a vertical shaft with a boss. The elastic force compensation component is arranged below the sealing cylinder. The elastic force compensation component includes a second compression sleeve and a disc spring that are sequentially stacked below the sealing cylinder. The upper end and the lower end of the second compression sleeve are respectively used to abut against the corresponding sealing cylinder and the disc spring to prevent the disc spring from directly contacting the sealing cylinder. The second compression sleeve and the disc spring are both sleeved outside the vertical shaft, and the axial position of the disc spring is limited by the boss.

5. The ground simulation test device according to claim 3, characterized in that, The test component includes a sealing sleeve and a vertical shaft. The pressing-down component includes a piston cylinder. The elastic force compensation component is arranged above the sealing cylinder. The elastic force compensation component includes a guide sleeve and a disc spring stacked above the sealing cylinder. The guide sleeve is sleeved outside the vertical shaft, and the disc spring is sleeved outside the guide sleeve. The disc spring is also used to support the piston.

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