Confining pressure simulation maintenance system and its operation method

Abstract

The present invention provides a confining pressure simulation and maintenance system and its operation method. The confining pressure simulation and maintenance system includes: a first pressure conversion device; a second pressure conversion device; a first conversion pipeline; a second conversion pipeline. The first conversion pipeline and the second conversion pipeline are arranged in parallel on the original medium outlet pipeline. The first pressure conversion device is communicated with the first conversion pipeline, and the second pressure conversion device is communicated with the second conversion pipeline; a replacement medium constant pressure pipeline. The first pressure conversion device and the second pressure conversion device are communicated with the replacement medium constant pressure pipeline, and the original medium and the replacement medium move relatively in the first pressure conversion device and the second pressure conversion device; a controller. Opening and closing valves are arranged on the first conversion pipeline and the second conversion pipeline, and the opening and closing valves are electrically connected to the controller. The controller controls the opening and closing of the opening and closing valves so that the original medium alternately enters and exits the first pressure conversion device and the second pressure conversion device. The present invention solves the problem of unstable confining pressure maintenance in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulics, and more specifically, to a confining pressure simulation and maintenance system and an operation method thereof. Background Art

[0002] Currently, the system pressure is maintained by an overflow valve or an overflow valve plus an accumulator. This method is used in conventional hydraulic systems, water pressure, and pneumatic pressure to maintain the system pressure through the overflow valve. However, the characteristic of maintaining pressure by the overflow valve is that it is sensitive to the viscosity of the system. For fluids with a large viscosity change, it is easy to make the pressure unstable. For fluids with a relatively small viscosity, the pressure maintenance is unstable. In addition, for relatively small or large pressures, it is difficult to maintain stable pressure due to the component performance of the overflow valve.

[0003] Currently, with the increasing development of drilling and oil production technologies, the drilling depth of oil and gas wells is getting deeper and deeper. For ultra-deep wells of 6000 - 10000 meters, various supporting downhole tools need to be developed. During the development of these downhole tools, dynamic confining pressure simulation experiments with ultra-high pressure values are required. Currently, the dynamic confining pressure simulation experimental devices all maintain the system pressure through an overflow valve or an overflow valve plus an accumulator. This confining pressure system has two deficiencies. One is that the simulated dynamic confining pressure is relatively low and cannot meet the simulation of ultra-high dynamic confining pressure of 60 - 100 MPa. The other is that the working fluid generated in the confining pressure simulation experiment contains a large amount of solid particles. When discharged directly through the overflow valve under high pressure and high flow rate conditions, it will cause serious wear of the overflow valve spool, resulting in unstable confining pressure and seriously affecting the service life of the overflow valve.

[0004] As can be seen from the above, there is a problem of unstable confining pressure maintenance in the prior art. Summary of the Invention

[0005] The main objective of the present invention is to provide a confining pressure simulation and maintenance system and an operation method thereof to solve the problem of unstable confining pressure maintenance in the prior art.

[0006] To achieve the above object, according to one aspect of the present invention, a confining pressure simulation and maintenance system is provided, comprising: a first pressure conversion device; a second pressure conversion device; a first conversion pipeline; a second conversion pipeline, the first conversion pipeline and the second conversion pipeline are arranged in parallel on the original medium outlet pipeline, one end of the first pressure conversion device is communicated with the first conversion pipeline, and one end of the second pressure conversion device is communicated with the second conversion pipeline; a replacement medium constant pressure pipeline, the other ends of the first pressure conversion device and the second pressure conversion device are both communicated with the replacement medium constant pressure pipeline, and the original medium and the replacement medium can move relatively in the first pressure conversion device and the second pressure conversion device to convert the pressure of the original medium into the pressure of the replacement medium; a controller, opening and closing valves are arranged on the first conversion pipeline and the second conversion pipeline, there are multiple opening and closing valves, and multiple opening and closing valves are electrically connected to the controller, and the controller can control the opening and closing of the multiple opening and closing valves so that the original medium alternately enters and flows out of the first pressure conversion device and the second pressure conversion device.

[0007] Further, the opening and closing valves include a first inlet valve, a second inlet valve, a first outlet valve and a second outlet valve, the first inlet valve and the first outlet valve are arranged on the first conversion pipeline, and the second inlet valve and the second outlet valve are arranged on the second conversion pipeline.

[0008] Further, the connection between one end of the first pressure conversion device and the first conversion pipeline is located between the first inlet valve and the first outlet valve; and / or the connection between one end of the second pressure conversion device and the second conversion pipeline is located between the second inlet valve and the second outlet valve.

[0009] Further, the first pressure conversion device comprises: a first cylinder, the first cylinder has a first hollow cavity, the first hollow cavity includes a first replacement medium cavity and a first original medium cavity that are sequentially communicated, the replacement medium constant pressure pipeline is communicated with the first replacement medium cavity, and the first conversion pipeline is communicated with the first original medium cavity; a first piston, the first piston is movably arranged in the first replacement medium cavity.

[0010] Further, the second pressure conversion device comprises: a second cylinder, the second cylinder has a second hollow cavity, the second hollow cavity includes a second replacement medium cavity and a second original medium cavity that are sequentially communicated, the replacement medium constant pressure pipeline is communicated with the second replacement medium cavity, and the second conversion pipeline is communicated with the second original medium cavity; a second piston, the second piston is movably arranged in the second replacement medium cavity.

[0011] Further, the cross-sectional area of the first replacement medium cavity is larger than the cross-sectional area of the first original medium cavity; and / or the cross-sectional area of the second replacement medium cavity is larger than the cross-sectional area of the second original medium cavity.

[0012] Further, the first pressure conversion device further includes a first position sensor, which is electrically connected to the controller and is configured to receive the position signal of the first piston and send it to the controller; and / or the second pressure conversion device further includes a second position sensor, which is electrically connected to the controller and is configured to receive the position signal of the second piston and send it to the controller.

[0013] Further, the confining pressure simulation and maintenance system further includes two overflow valves, which are arranged on the replacement medium constant pressure pipeline and are respectively close to the first pressure conversion device and the second pressure conversion device.

[0014] Further, the replacement medium is any one of hydraulic oil and emulsion.

[0015] Further, the on-off valve is an electro-hydraulic proportional valve or an electric ball valve.

[0016] According to another aspect of the present invention, there is provided an operating method for a confining pressure simulation maintaining system. The confining pressure simulation maintaining system includes: a first pressure conversion device, which includes a first piston and a first replacement medium chamber, and the first piston is movably arranged in the first replacement medium chamber; a second pressure conversion device, which includes a second piston and a second replacement medium chamber, and the second piston is movably arranged in the second replacement medium chamber; a first conversion pipeline; a second conversion pipeline, the first conversion pipeline and the second conversion pipeline are arranged in parallel on the original medium outlet pipeline, one end of the first pressure conversion device is communicated with the first conversion pipeline, and one end of the second pressure conversion device is communicated with the second conversion pipeline; a replacement medium constant pressure pipeline, the other ends of the first pressure conversion device and the second pressure conversion device are both communicated with the replacement medium constant pressure pipeline; a controller, on the first conversion pipeline and the second conversion pipeline, there are opening and closing valves, and the opening and closing valves are electrically connected to the controller. The opening and closing valves include a first inlet valve, a second inlet valve, a first outlet valve and a second outlet valve. The first inlet valve and the first outlet valve are arranged on the first conversion pipeline, and the second inlet valve and the second outlet valve are arranged on the second conversion pipeline. The operating method includes: the controller controls the first inlet valve to open, and the first outlet valve and the second inlet valve to close, so that the original medium enters the first pressure conversion device through the first conversion pipeline; the original medium pushes the first piston to move in the first replacement medium chamber to extrude the replacement medium. When the first piston moves to the first preset position, the controller controls the first inlet valve to gradually close, and the second inlet valve to gradually open synchronously, so that the original medium enters the second pressure conversion device through the second conversion pipeline; the original medium pushes the second piston to move in the second replacement medium chamber to extrude the replacement medium. When the first inlet valve is fully closed and the second inlet valve is fully open, the controller controls the first outlet valve to open, and the replacement medium pushes the first piston to move in the first replacement medium chamber to discharge the original medium through the first conversion pipeline. When the first piston moves to the second preset position, the controller controls the first outlet valve to close; when the second piston moves to the first preset position, the controller controls the second inlet valve to gradually close, and the first inlet valve to gradually open synchronously, so that the original medium enters the first pressure conversion device through the first conversion pipeline; when the second inlet valve is fully closed and the first inlet valve is fully open, the controller controls the second outlet valve to open, and the replacement medium pushes the second piston to move in the second replacement medium chamber to discharge the original medium through the second conversion pipeline. When the second piston moves to the second preset position, the controller controls the second outlet valve to close; and so on in a cycle, the first pressure conversion device and the second pressure conversion device work alternately to maintain the pressure in the original medium outlet pipeline.

[0017] Applying the technical solution of the present invention, the confining pressure simulation and maintenance system includes a first pressure conversion device, a second pressure conversion device, a first conversion pipeline, a second conversion pipeline, a replacement medium constant pressure pipeline and a controller. The first conversion pipeline and the second conversion pipeline are arranged in parallel on the original medium outlet pipeline. One end of the first pressure conversion device is communicated with the first conversion pipeline, and one end of the second pressure conversion device is communicated with the second conversion pipeline. The other ends of the first pressure conversion device and the second pressure conversion device are both communicated with the replacement medium constant pressure pipeline. The original medium and the replacement medium can move relatively in the first pressure conversion device and the second pressure conversion device to convert the pressure of the original medium into the pressure of the replacement medium. Opening and closing valves are arranged on the first conversion pipeline and the second conversion pipeline. There are multiple opening and closing valves, and multiple opening and closing valves are electrically connected to the controller. The controller can control the opening and closing of the multiple opening and closing valves so that the original medium alternately enters and flows out of the first pressure conversion device and the second pressure conversion device. In this way, through the alternating operation of the first pressure conversion device and the second pressure conversion device, the pressure of the original medium is converted into the pressure of the replacement medium and maintained stably, solving the problem of unstable confining pressure maintenance in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 shows a schematic structural diagram of a confining pressure simulation and maintenance system according to a specific embodiment of the present invention; and

[0020] Figure 2 shows a schematic structural diagram of a first pressure conversion device according to a specific embodiment of the present invention;

[0021] Figure 3 shows a schematic structural diagram of a second pressure conversion device according to a specific embodiment of the present invention;

[0022] Figure 4 shows a flowchart of an operation method of a confining pressure simulation and maintenance system according to a specific embodiment of the present invention.

[0023] Among them, the above-mentioned drawings include the following reference numerals:

[0024] 10. First pressure conversion device; 11. First cylinder barrel; 111. First replacement medium chamber; 112. First original medium chamber; 12. First piston; 13. First position sensor; 20. Second pressure conversion device; 21. Second cylinder barrel; 211. Second replacement medium chamber; 212. Second original medium chamber; 22. Second piston; 23. Second position sensor; 30. First conversion pipeline; 40. Second conversion pipeline; 50. Replacement medium constant pressure pipeline; 60. First inlet valve; 70. Second inlet valve; 80. First outlet valve; 90. Second outlet valve; 100. Overflow valve; 110. Original medium outlet pipeline. Detailed implementation manner

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0027] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms do not limit the present invention.

[0028] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In order to solve the problem of unstable confining pressure maintenance in the prior art, the present invention provides a confining pressure simulation and maintenance system and its operation method.

[0030] Such as Figure 1As shown in the figure, the confining pressure simulation and maintenance system includes a first pressure conversion device 10, a second pressure conversion device 20, a first conversion pipeline 30, a second conversion pipeline 40, a replacement medium constant pressure pipeline 50, and a controller. The first conversion pipeline 30 and the second conversion pipeline 40 are arranged in parallel on the original medium outlet pipeline 110. One end of the first pressure conversion device 10 is communicated with the first conversion pipeline 30, and one end of the second pressure conversion device 20 is communicated with the second conversion pipeline 40. The other ends of the first pressure conversion device 10 and the second pressure conversion device 20 are both communicated with the replacement medium constant pressure pipeline 50. The original medium and the replacement medium can move relative to each other in the first pressure conversion device 10 and the second pressure conversion device 20 to convert the pressure of the original medium into the pressure of the replacement medium. Open and close valves are arranged on the first conversion pipeline 30 and the second conversion pipeline 40. There are multiple open and close valves, and the multiple open and close valves are all electrically connected to the controller. The controller can control the opening and closing of the multiple open and close valves so that the original medium alternately enters the first pressure conversion device 10 and the second pressure conversion device 20 and flows out from the first pressure conversion device 10 and the second pressure conversion device 20.

[0031] Through the confining pressure simulation and maintenance system including the first pressure conversion device 10, the second pressure conversion device 20, the first conversion pipeline 30, the second conversion pipeline 40, the replacement medium constant pressure pipeline 50, and the controller, the first conversion pipeline 30 and the second conversion pipeline 40 are arranged in parallel on the original medium outlet pipeline 110. One end of the first pressure conversion device 10 is communicated with the first conversion pipeline 30, and one end of the second pressure conversion device 20 is communicated with the second conversion pipeline 40. The other ends of the first pressure conversion device 10 and the second pressure conversion device 20 are both communicated with the replacement medium constant pressure pipeline 50. The original medium and the replacement medium can move relative to each other in the first pressure conversion device 10 and the second pressure conversion device 20 to convert the pressure of the original medium into the pressure of the replacement medium. Open and close valves are arranged on the first conversion pipeline 30 and the second conversion pipeline 40. There are multiple open and close valves, and the multiple open and close valves are all electrically connected to the controller. The controller can control the opening and closing of the multiple open and close valves so that the original medium alternately enters the first pressure conversion device 10 and the second pressure conversion device 20 and flows out from the first pressure conversion device 10 and the second pressure conversion device 20. In this way, through the alternating operation of the first pressure conversion device 10 and the second pressure conversion device 20, the pressure of the original medium is converted into the pressure of the replacement medium and maintained stable, ensuring that the pressure in the original medium outlet pipeline 110 is maintained stable.

[0032] As Figure 1As shown, the on-off valve includes a first inlet valve 60, a second inlet valve 70, a first outlet valve 80, and a second outlet valve 90. The first inlet valve 60 and the first outlet valve 80 are provided on the first conversion pipeline 30. The second inlet valve 70 and the second outlet valve 90 are provided on the second conversion pipeline 40. The controller controls the opening and closing of the first inlet valve 60, the second inlet valve 70, the first outlet valve 80, and the second outlet valve 90 respectively, so as to control the first pressure conversion device 10 and the second pressure conversion device 20 to work alternately, convert the pressure of the original medium into the pressure of the replacement medium and maintain stability, and ensure that the pressure in the original medium outlet pipeline 110 is maintained stable.

[0033] In this embodiment, the connection point between one end of the first pressure conversion device 10 and the first conversion pipeline 30 is located between the first inlet valve 60 and the first outlet valve 80.

[0034] In this embodiment, the connection point between one end of the second pressure conversion device 20 and the second conversion pipeline 40 is located between the second inlet valve 70 and the second outlet valve 90.

[0035] In this embodiment, the first pressure conversion device 10 and the second pressure conversion device 20 are exactly the same pressure conversion devices.

[0036] As Figure 2 shown, the first pressure conversion device 10 includes a first cylinder 11 and a first piston 12. The first cylinder 11 has a first hollow cavity, and the first hollow cavity includes a first replacement medium cavity 111 and a first original medium cavity 112 that are sequentially connected. The replacement medium constant pressure pipeline 50 is connected to the first replacement medium cavity 111, and the first conversion pipeline 30 is connected to the first original medium cavity 112. The first piston 12 is movably disposed in the first replacement medium cavity 111. When the first piston 12 is in the initial position, the first piston 12 is located at one end of the first replacement medium cavity 111 close to the first original medium cavity 112, and at this time, the first replacement medium cavity 111 is filled with the replacement medium. When the first inlet valve 60 is opened, the original medium enters the first original medium cavity 112 through the first conversion pipeline 30. When the original medium fills the entire first original medium cavity 112, it continues to enter the first replacement medium cavity 111 and pushes the first piston 12 to move in the first replacement medium cavity 111, thereby gradually squeezing the replacement medium out of the first replacement medium cavity 111, so that pressure conversion occurs between the original medium and the replacement medium.

[0037] As Figure 3As shown, the second pressure conversion device 20 includes a second cylinder 21 and a second piston 22. The second cylinder 21 has a second hollow cavity, which includes a second replacement medium cavity 211 and a second original medium cavity 212 that are sequentially connected. The replacement medium constant pressure pipeline 50 is connected to the second replacement medium cavity 211, and the second conversion pipeline 40 is connected to the second original medium cavity 212. The second piston 22 is movably arranged in the second replacement medium cavity 211. Since the second pressure conversion device 20 is exactly the same as the first pressure conversion device 10, the pressure conversion process of the original medium and the replacement medium in the second pressure conversion device 20 will not be elaborated here.

[0038] In this embodiment, the cross-sectional area of the first replacement medium cavity 111 is larger than that of the first original medium cavity 112. Further, the cross-sectional area of the first replacement medium cavity 111 is set in proportion to that of the first original medium cavity 112. The specific proportion needs to be determined according to the physical properties of the original medium and the replacement medium. Correspondingly, the cross-sectional area of the second replacement medium cavity 211 is larger than that of the second original medium cavity 212. The cross-sectional area of the second replacement medium cavity 211 is also set in proportion to that of the second original medium cavity 212.

[0039] As Figure 2 shown, the first pressure conversion device 10 further includes a first position sensor 13. The first position sensor 13 is electrically connected to the controller and is used to receive the position signal of the first piston 12 and send it to the controller. By setting the first position sensor 13, the controller can obtain the position signal of the first piston 12 and control the opening and closing of the first inlet valve 60 and the first outlet valve 80 according to the position signal of the first piston 12, so as to control the alternating operation of the first pressure conversion device 10 and the second pressure conversion device 20, convert the pressure of the original medium into the pressure of the replacement medium and maintain stability, and ensure that the pressure in the original medium outlet pipeline 110 remains stable.

[0040] As Figure 3 shown, the second pressure conversion device 20 further includes a second position sensor 23. The second position sensor 23 is electrically connected to the controller and is used to receive the position signal of the second piston 22 and send it to the controller. By setting the second position sensor 23, the controller can obtain the position signal of the second piston 22 and control the opening and closing of the second inlet valve 70 and the second outlet valve 90 according to the position signal of the second piston 22, so as to control the alternating operation of the first pressure conversion device 10 and the second pressure conversion device 20.

[0041] As Figure 1As shown, the confining pressure simulation and maintenance system further includes an overflow valve 100. There are two overflow valves 100, which are arranged on the replacement medium constant pressure pipeline 50 and are respectively close to the first pressure conversion device 10 and the second pressure conversion device 20. By arranging the overflow valve 100 on the replacement medium constant pressure pipeline 50, the pressure in the replacement medium constant pressure pipeline 50 can be ensured to be stable, thereby ensuring the stable pressure conversion of the first pressure conversion device 10 and the second pressure conversion device 20, and thus ensuring the stable pressure in the original medium outlet pipeline 110.

[0042] In this embodiment, the replacement medium is any one of hydraulic oil and emulsion. Of course, the replacement medium can also be other media with relatively stable viscosities, which can be selected according to actual needs.

[0043] In this embodiment, the on-off valve is an electro-hydraulic proportional valve or an electric ball valve. Specifically, the first inlet valve 60 and the second inlet valve 70 are electro-hydraulic proportional valves. The first outlet valve 80 and the second outlet valve 90 are electric ball valves.

[0044] As Figure 4 shown, the operation method of the confining pressure simulation and maintenance system includes: the controller controls the first inlet valve 60 to open, and the first outlet valve 80 and the second inlet valve 70 to close, so that the original medium enters the first pressure conversion device 10 through the first conversion pipeline 30; the original medium pushes the first piston 12 to move in the first replacement medium chamber 111 to extrude the replacement medium. When the first piston 12 moves to the first preset position, the controller controls the first inlet valve 60 to gradually close, and the second inlet valve 70 to gradually open synchronously, so that the original medium enters the second pressure conversion device 20 through the second conversion pipeline 40; the original medium pushes the second piston 22 to move in the second replacement medium chamber 211 to extrude the replacement medium. When the first inlet valve 60 is fully closed and the second inlet valve 70 is fully open, the controller controls the first outlet valve 80 to open, and the replacement medium pushes the first piston 12 to move in the first replacement medium chamber 111 to discharge the original medium through the first conversion pipeline 30. When the first piston 12 moves to the second preset position, the controller controls the first outlet valve 80 to close; when the second piston 22 moves to the first preset position, the controller controls the second inlet valve 70 to gradually close, and the first inlet valve 60 to gradually open synchronously, so that the original medium enters the first pressure conversion device 10 through the first conversion pipeline 30; when the second inlet valve 70 is fully closed and the first inlet valve 60 is fully open, the controller controls the second outlet valve 90 to open, and the replacement medium pushes the second piston 22 to move in the second replacement medium chamber 211 to discharge the original medium through the second conversion pipeline 40. When the second piston 22 moves to the second preset position, the controller controls the second outlet valve 90 to close; and so on in a cycle, the first pressure conversion device 10 and the second pressure conversion device 20 work alternately to maintain the pressure in the original medium outlet pipeline 110.

[0045] Specifically, when the first piston 12 moves to the first preset position, the closing speed of the first inlet valve 60 is the same as the opening speed of the second inlet valve 70. That is to say, when the first inlet valve 60 is completely closed, the second inlet valve 70 is just completely opened. Correspondingly, when the second piston 22 moves to the first preset position, when the second inlet valve 70 is completely closed, the first inlet valve 60 is just completely opened.

[0046] In this embodiment, while the first inlet valve 60 and the second inlet valve 70 are gradually switching the switch state, the movement speed of the first piston 12 gradually decreases and the movement speed of the second piston 22 gradually increases, or the movement speed of the second piston 22 gradually decreases and the movement speed of the first piston 12 gradually increases, and the absolute values of the increasing or decreasing accelerations are the same, so as to reduce the pressure fluctuation caused by the impact during the switching process.

[0047] In this embodiment, Figure 1 The arrow shown in is the flow direction of the original medium. The original medium flows into the first pressure conversion device 10 or the second pressure conversion device 20 to complete the pressure conversion and flows out from the first pressure conversion device 10 or the second pressure conversion device 20. The solid particles contained in the original medium will not damage the first pressure conversion device 10 and the second pressure conversion device 20, so that the confining pressure simulation maintenance system in this application has sufficient service life and confining pressure maintenance stability.

[0048] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: The confining pressure simulation maintenance system includes a first pressure conversion device 10, a second pressure conversion device 20, a first conversion pipeline 30, a second conversion pipeline 40, a replacement medium constant pressure pipeline 50 and a controller. The first conversion pipeline 30 and the second conversion pipeline 40 are arranged in parallel on the original medium outlet pipeline 110. One end of the first pressure conversion device 10 is communicated with the first conversion pipeline 30, and one end of the second pressure conversion device 20 is communicated with the second conversion pipeline 40. The other ends of the first pressure conversion device 10 and the second pressure conversion device 20 are both communicated with the replacement medium constant pressure pipeline 50. The original medium and the replacement medium can move relatively in the first pressure conversion device 10 and the second pressure conversion device 20 to convert the pressure of the original medium into the pressure of the replacement medium. Open and close valves are arranged on the first conversion pipeline 30 and the second conversion pipeline 40. There are multiple open and close valves, and multiple open and close valves are electrically connected to the controller. The controller can control the opening and closing of multiple open and close valves so that the original medium alternately enters and flows out of the first pressure conversion device 10 and the second pressure conversion device 20. In this way, through the alternating operation of the first pressure conversion device 10 and the second pressure conversion device 20, the pressure of the original medium is converted into the pressure of the replacement medium and maintained stable, ensuring that the pressure in the original medium outlet pipeline 110 is maintained stable.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0051] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A confining pressure simulation and maintenance system, characterized in that, Comprising: A first pressure conversion device (10); A second pressure conversion device (20): A first conversion pipeline (30); A second conversion pipeline (40), the first conversion pipeline (30) and the second conversion pipeline (40) are arranged in parallel on the original medium outlet pipeline (110), one end of the first pressure conversion device (10) is communicated with the first conversion pipeline (30), and one end of the second pressure conversion device (20) is communicated with the second conversion pipeline (40); A replacement medium constant pressure pipeline (50), the other ends of the first pressure conversion device (10) and the second pressure conversion device (20) are both communicated with the replacement medium constant pressure pipeline (50), the original medium and the replacement medium can move relatively in the first pressure conversion device (10) and the second pressure conversion device (20) to convert the pressure of the original medium into the pressure of the replacement medium; A controller, on the first conversion pipeline (30) and the second conversion pipeline (40) there are opening and closing valves, there are multiple opening and closing valves, and multiple opening and closing valves are all electrically connected to the controller, the controller can control the opening and closing of the multiple opening and closing valves so that the original medium alternately enters the first pressure conversion device (10) and the second pressure conversion device (20) and flows out from the first pressure conversion device (10) and the second pressure conversion device (20); Wherein, the opening and closing valves include a first inlet valve (60), a second inlet valve (70), a first outlet valve (80) and a second outlet valve (90), the first inlet valve (60) and the first outlet valve (80) are arranged on the first conversion pipeline (30), and the second inlet valve (70) and the second outlet valve (90) are arranged on the second conversion pipeline (40); The connection position between one end of the first pressure conversion device (10) and the first conversion pipeline (30) is located between the first inlet valve (60) and the first outlet valve (80); and / or the connection position between one end of the second pressure conversion device (20) and the second conversion pipeline (40) is located between the second inlet valve (70) and the second outlet valve (90).

2. The confining pressure simulation and maintenance system according to claim 1, wherein The first pressure conversion device (10) includes: A first cylinder (11), the first cylinder (11) has a first hollow cavity, the first hollow cavity includes a first replacement medium cavity (111) and a first original medium cavity (112) which are sequentially communicated, the replacement medium constant pressure pipeline (50) is communicated with the first replacement medium cavity (111), and the first conversion pipeline (30) is communicated with the first original medium cavity (112); A first piston (12), the first piston (12) is movably arranged in the first replacement medium cavity (111).

3. The confining pressure simulation maintaining system according to claim 2, wherein, The second pressure conversion device (20) includes: The second cylinder (21), the second cylinder (21) has a second hollow cavity, the second hollow cavity includes a second replacement medium cavity (211) and a second original medium cavity (212) that are sequentially communicated, the replacement medium constant pressure pipeline (50) is communicated with the second replacement medium cavity (211), and the second conversion pipeline (40) is communicated with the second original medium cavity (212); The second piston (22), the second piston (22) is movably arranged in the second replacement medium cavity (211).

4. The confining pressure simulation maintenance system according to claim 3, characterized in that The cross-sectional area of the first replacement medium cavity (111) is larger than the cross-sectional area of the first original medium cavity (112); and / or The cross-sectional area of the second replacement medium cavity (211) is larger than the cross-sectional area of the second original medium cavity (212).

5. The confining pressure simulation maintenance system according to claim 3, characterized in that The first pressure conversion device (10) further includes a first position sensor (13), the first position sensor (13) is electrically connected to the controller, and is used for receiving the position signal of the first piston (12) and sending it to the controller; and / or The second pressure conversion device (20) further includes a second position sensor (23), the second position sensor (23) is electrically connected to the controller, and is used for receiving the position signal of the second piston (22) and sending it to the controller.

6. The confining pressure simulation and maintenance system according to any one of claims 1 to 5, characterized in that The confining pressure simulation maintenance system further includes an overflow valve (100), there are two overflow valves (100), the two overflow valves (100) are arranged on the replacement medium constant pressure pipeline (50), and are respectively close to the first pressure conversion device (10) and the second pressure conversion device (20).

7. The confining pressure simulation and maintenance system according to any one of claims 1 to 5, characterized in that The replacement medium is any one of hydraulic oil and emulsion liquid.

8. The confining pressure simulation and maintenance system according to any one of claims 1 to 5, characterized in that The on-off valve is an electro-hydraulic proportional valve or an electric ball valve.

9. A method for operating a confining pressure simulation and maintenance system, characterized in that, The confining pressure simulation and maintenance system includes: a first pressure conversion device (10), the first pressure conversion device (10) includes a first piston (12) and a first replacement medium chamber (111), the first piston (12) is movably arranged in the first replacement medium chamber (111); a second pressure conversion device (20), the second pressure conversion device (20) includes a second piston (22) and a second replacement medium chamber (211), the second piston (22) is movably arranged in the second replacement medium chamber (211); a first conversion pipeline (30); a second conversion pipeline (40), the first conversion pipeline (30) and the second conversion pipeline (40) are arranged in parallel on the original medium outlet pipeline (110), one end of the first pressure conversion device (10) is communicated with the first conversion pipeline (30), and one end of the second pressure conversion device (20) is communicated with the second conversion pipeline (40); a replacement medium constant pressure pipeline (50), the other ends of the first pressure conversion device (10) and the second pressure conversion device (20) are both communicated with the replacement medium constant pressure pipeline (50); a controller, on the first conversion pipeline (30) and the second conversion pipeline (40), there are opening and closing valves, the opening and closing valves are electrically connected to the controller, the opening and closing valves include a first inlet valve (60), a second inlet valve (70), a first outlet valve (80) and a second outlet valve (90), the first inlet valve (60) and the first outlet valve (80) are arranged on the first conversion pipeline (30), the second inlet valve (70) and the second outlet valve (90) are arranged on the second conversion pipeline (40), and the operation method includes: The controller controls the first inlet valve (60) to open, and the first outlet valve (80) and the second inlet valve (70) to close, so that the original medium enters the first pressure conversion device (10) through the first conversion pipeline (30); The original medium pushes the first piston (12) to move in the first replacement medium chamber (111) to extrude the replacement medium. When the first piston (12) moves to a first preset position, the controller controls the first inlet valve (60) to gradually close, and the second inlet valve (70) to gradually open synchronously, so that the original medium enters the second pressure conversion device (20) through the second conversion pipeline (40); The original medium pushes the second piston (22) to move within the second replacement medium chamber (211) to extrude the replacement medium. When the first inlet valve (60) is fully closed and the second inlet valve (70) is fully open, the controller controls the first outlet valve (80) to open. The replacement medium pushes the first piston (12) to move within the first replacement medium chamber (111) to discharge the original medium through the first conversion pipeline (30). When the first piston (12) moves to the second preset position, the controller controls the first outlet valve (80) to close; When the second piston (22) moves to the first preset position, the controller controls the second inlet valve (70) to gradually close, and the first inlet valve (60) gradually opens synchronously, so that the original medium enters the first pressure conversion device (10) through the first conversion pipeline (30); When the second inlet valve (70) is fully closed and the first inlet valve (60) is fully open, the controller controls the second outlet valve (90) to open. The replacement medium pushes the second piston (22) to move within the second replacement medium chamber (211) to discharge the original medium through the second conversion pipeline (40). When the second piston (22) moves to the second preset position, the controller controls the second outlet valve (90) to close; In this cycle, the first pressure conversion device (10) and the second pressure conversion device (20) work alternately to maintain the pressure in the original medium outlet pipeline (110).

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