A core spontaneous imbibition experiment device, system and method

Abstract

The present application relates to a kind of core self-absorption experimental device, system and method, the device includes core experiment dish, visualization shell, clamping assembly, first sealing assembly and second sealing assembly;First sealing assembly and second sealing assembly are blocked at the two ends of visualization shell respectively, and are fixed in clamping assembly;Core experiment dish is set in visualization shell;First sealing assembly is provided with gas injection hole, and is communicated with visualization shell;Liquid guide pipe is set in the bottom of experiment dish body;Second sealing assembly is provided with liquid injection hole, and liquid guide pipe is communicated with liquid injection hole;Measuring device is fixed on the periphery of experiment dish body.The present application can control the volume of gas injected into visualization shell to control the pressure in visualization shell as pore pressure, simulate the pore pressure environment of target rock reservoir, realize the self-absorption experiment of the core to be measured under pore pressure;By the constant liquid level of pump into experiment dish body, so that the core to be measured is always immersed in preset color fluid.

Description

Technical Field

[0001] This invention relates to a core self-absorption experimental apparatus, system, and method. Background Technology

[0002] Water lock formation can occur during gas well drilling, completion, stimulation, operation, and production, and the capillary self-absorption effect of reservoir rocks is one of the important causes of water lock formation. The capillary self-absorption effect of reservoir rocks is a physicochemical phenomenon in which a certain liquid enters the porous medium on its own under the drive of capillary force. Current technology monitors the capillary self-absorption process of rocks through capillary self-absorption experiments to study the self-absorption characteristics of reservoir rock samples, laying the foundation for research on reservoir water lock damage. Currently, the method of suspending the rock core using a balance is commonly used for capillary self-absorption experiments. This method has the advantages of simple equipment and direct data acquisition. Summary of the Invention

[0003] The inventors discovered that existing capillary self-absorption experimental devices cannot guarantee that the end of the core sample is always immersed in the preset fluid, causing the length of the submerged core end to change during the capillary self-absorption experiment. Furthermore, these devices can only study the self-absorption process of core samples under normal pressure and cannot simulate the self-absorption process of core samples under pore pressure. In view of the above problems, this invention provides a core self-absorption experimental device, system, and method to solve or partially solve the above problems. The technical solution proposed by this invention is as follows:

[0004] In a first aspect, embodiments of the present invention provide a core self-absorption experimental device, comprising a core experimental dish, a visualization shell, a clamping assembly, a first sealing assembly, and a second sealing assembly;

[0005] The first sealing assembly and the second sealing assembly respectively seal both ends of the visible housing;

[0006] The first sealing assembly and the second sealing assembly are fixed to the clamping assembly;

[0007] The core experimental dish is housed within the visualization shell;

[0008] The first sealing component is provided with an air injection hole and is in communication with the visible housing;

[0009] The core test dish includes the test dish body, the liquid guide tube, and the measuring device;

[0010] The liquid guide tube is located at the bottom of the experimental dish body;

[0011] The second sealing assembly is provided with a liquid injection hole, and the liquid guide tube is connected to the liquid injection hole;

[0012] The measuring device is fixed to the outer periphery of the experimental dish.

[0013] In one or more embodiments, the core test dish further includes a filter screen disposed within the test dish body.

[0014] In one or more embodiments, the device further includes a protective cover disposed on the outside of the visualization housing, with its two ends respectively fixed to the first sealing assembly and the second sealing assembly;

[0015] The protective cover has at least one open area.

[0016] In one or more embodiments, the core test dish further includes a support tube disposed at the bottom of the test dish body;

[0017] The support tube is disposed on the outside of the liquid guide tube and fixed to the second sealing assembly;

[0018] The support tube is provided with at least one first through hole so that the annulus between the liquid guide tube and the support tube communicates with the visualization shell.

[0019] In one or more embodiments, the second sealing assembly is provided with a drain hole.

[0020] In one or more embodiments, the clamping assembly includes a connector, a first pressure plate, and a second pressure plate;

[0021] The first pressure plate and the second pressure plate are connected by the connecting member;

[0022] The first pressure plate is fixed to the first sealing assembly, and the second pressure plate is fixed to the second sealing assembly.

[0023] In one or more embodiments, a second through hole is provided at the bottom of the experimental dish body, and the second through hole is connected to the liquid guiding tube;

[0024] The inner diameter of the liquid guide tube is greater than or equal to the diameter of the second through hole.

[0025] Secondly, embodiments of the present invention provide a core self-absorption testing system, including a constant temperature container, a gas source, a liquid injection mechanism, a four-way pipe fitting, a pressure gauge, a first valve, a second valve, a third valve, and the core self-absorption experimental device as described above;

[0026] The core self-absorption experimental device is set inside the constant temperature container;

[0027] The four-way fitting is connected to the air injection port, the first valve, the second valve, and the pressure gauge, respectively.

[0028] The first valve is connected to the gas source;

[0029] The third valve is located on the connecting pipe between the injection hole and the injection mechanism.

[0030] In one or more embodiments, the system further includes a fourth valve and an intermediate container, the fourth valve being disposed on the connecting pipe between the drain hole and the intermediate container.

[0031] Thirdly, embodiments of the present invention provide a core self-absorption testing method, using the core self-absorption testing system described above, including:

[0032] Place the rock core to be tested into the experimental dish body;

[0033] Set the temperature of the constant temperature container to a preset experimental temperature and stabilize it for a first preset time;

[0034] Open the first valve and inject gas into the visualization housing until the pressure inside the visualization housing reaches the first preset pressure;

[0035] Close the first valve, open the third valve, start the liquid injection mechanism, and inject a preset colored fluid into the injection hole at a first preset speed until the liquid level in the experimental dish body is flush with the upper surface of the experimental dish body, and keep the liquid level in the experimental dish body stable.

[0036] Record the self-absorption height of the core sample at preset time intervals;

[0037] The injection mechanism will be shut down after a preset experimental time.

[0038] In one or more embodiments, the method further includes:

[0039] Drain the liquid in the experimental dish to below the lower end of the core sample, and close the third valve;

[0040] Open the second valve to release the pressure inside the visualization shell and remove the core sample to be tested.

[0041] In one or more embodiments, before setting the temperature of the constant-temperature container to a preset experimental temperature and maintaining it for a first preset time, the method further includes:

[0042] Gas is injected into the visualization housing until the pressure inside the visualization housing reaches a second preset pressure, and the housing is left to stand for a second preset time to check its airtightness.

[0043] The core self-absorption experimental device provided in this embodiment of the invention seals both ends of the visualization shell with a first sealing component and a second sealing component, which are fixed to a clamping component, thereby confining the visualization shell within a fixed area and ensuring its airtightness. The first sealing component is provided with an injection hole and communicates with the visualization shell. By controlling the volume of gas injected into the visualization shell, the pressure inside the visualization shell can be controlled to the pore pressure, simulating the pore pressure environment of the target rock reservoir, thus realizing the self-absorption experiment of the core under pore pressure. By setting the liquid guide tube at the bottom of the experimental dish body and communicating with the injection hole set on the second sealing component, the core to be tested is placed on the experimental dish body during the experiment, and a preset colored fluid is injected through the injection hole to keep the liquid level in the experimental dish body constant so that the core to be tested is always immersed in the preset colored fluid. The self-absorption height is observed and the test results are obtained by measuring devices fixed to the outer periphery of the experimental dish body. The test results can be used to study the capillary self-absorption distribution characteristics of the core under pore pressure. The shell is set as a visualization shell, making the self-absorption experimental process visible.

[0044] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0045] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0046] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0047] Figure 1 This is a schematic diagram of the core self-absorption experimental device provided in an embodiment of the present invention;

[0048] Figure 2 for Figure 1 Side view;

[0049] Figure 3 for Figure 2 AA section view;

[0050] Figure 4 for Figure 1 Top view;

[0051] Figure 5 for Figure 1 A bottom view;

[0052] Figure 6 A schematic diagram of the structure of the first sealing assembly provided in an embodiment of the present invention. Figure 1 ;

[0053] Figure 7 This is a schematic diagram of the structure of the second sealing assembly provided in an embodiment of the present invention;

[0054] Figure 8 A schematic diagram of the structure of the first sealing assembly provided in an embodiment of the present invention. Figure 2 ;

[0055] Figure 9 This is a three-dimensional structural diagram of the core experimental dish provided in an embodiment of the present invention;

[0056] Figure 10 for Figure 9 Side view;

[0057] Figure 11 for Figure 10 BB section view;

[0058] Figure 12 This is a schematic diagram of the structure of the experimental dish body provided in an embodiment of the present invention;

[0059] Figure 13 This is a schematic diagram of the core self-absorption testing system provided in an embodiment of the present invention;

[0060] In the diagram: 100, core sample dish; 101, dish body; 102, liquid guide tube; 103, measuring device; 104, filter screen; 105, support tube; 106, first through hole; 107, second through hole; 201, visualization shell; 202, clamping assembly; 2021, connector; 2022, first pressure plate; 2023, second pressure plate; 203, first sealing assembly; 2031, first rubber stopper; 2032, second rubber stopper; 2033, third rubber stopper; 2034, rubber ring groove; 2035, sealing rubber ring; 2036, sealing gasket; 204, second sealing assembly; 205, air injection hole; 206, liquid injection hole; 207, protective cover; 208, hollow area; 209, drain hole. Detailed Implementation

[0061] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intermediate elements between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0063] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0064] Currently, the main method for conducting capillary self-absorption experiments is to suspend the core sample using a balance. This method has the advantages of simple equipment and direct data acquisition. However, it also has shortcomings, mainly in two aspects: 1. The length of the submerged core end changes as the experiment progresses; 2. It can only study the seepage process under normal pressure and cannot reproduce the self-absorption process under conditions of pore pressure and formation temperature. Based on this, this invention provides a core self-absorption experimental device, such as... Figures 1 to 8 As shown, it includes a core test dish 100, a visualization shell 201, a clamping assembly 202, a first sealing assembly 203, and a second sealing assembly 204;

[0065] The first sealing component 203 and the second sealing component 204 respectively seal both ends of the visual housing 201;

[0066] The first sealing component 203 and the second sealing component 204 are fixed to the clamping component 202;

[0067] The core experimental dish 100 is disposed inside the visualization shell 201;

[0068] The first sealing component 203 is provided with an injection port 205 and is connected to the visualization shell 201; by providing the injection port 205, gas can be injected into the visualization shell 201 so that the pressure inside the visualization shell 201 reaches the preset experimental pressure, thereby simulating the pressure environment of the target reservoir.

[0069] like Figure 11 and 12 As shown, the core test dish 100 includes a test dish body 101, a liquid guide tube 102, and a measuring device 103;

[0070] The liquid guide tube 102 is disposed at the bottom of the experimental dish body 101;

[0071] The second sealing component 204 is provided with a liquid injection hole 206, and the liquid guide tube 102 is connected to the liquid injection hole 206. In this embodiment, the two ends of the liquid guide tube 102 are respectively connected to the experimental dish body 101 and the liquid injection hole 206, so as to inject the preset color liquid into the experimental dish body 101 through the liquid injection hole 206, and to discharge the liquid in the experimental dish body 101 from the liquid injection hole 206 after the self-absorption experiment is completed.

[0072] The measuring device 103 is fixed to the outer periphery of the experimental dish body 101. By setting the measuring device 103, the self-absorption height of the core sample under test can be observed during the self-absorption experiment.

[0073] The core self-absorption experimental device provided in this embodiment of the invention seals both ends of the visualization shell 201 with a first sealing component 203 and a second sealing component 204, respectively. The first sealing component 203 and the second sealing component 204 are fixed to the clamping component 202, thereby confining the visualization shell 201 within a fixed area and ensuring the airtightness of the visualization shell 201. The first sealing component 203 is provided with an injection port 205 and communicates with the visualization shell 201. The pressure inside the visualization shell 201 can be controlled by controlling the volume of gas injected into the visualization shell 201 to achieve pore pressure, simulating the pore pressure environment of the target rock reservoir, and realizing the test core under pore pressure. The self-absorption experiment was conducted by placing a liquid guide tube 102 at the bottom of the experimental dish body 101 and connecting it to the injection hole 206 on the second sealing component 204. During the experiment, the core sample to be tested was placed on the experimental dish body 101, and a preset colored fluid was injected through the injection hole 206 to keep the liquid level in the experimental dish body 101 constant so that the core sample to be tested was always immersed in the preset colored fluid. The self-absorption height was observed and the test results were obtained by measuring the device 103 fixed to the outer periphery of the experimental dish body 101. The test results can be used to study the capillary self-absorption distribution characteristics of the core sample under pore pressure. The shell was set as a visualization shell to make the self-absorption experiment process visible.

[0074] In one or more embodiments, such as Figure 9 As shown, the core test dish 100 also includes a filter screen 104, which is disposed inside the test dish body 101. When the filter screen 104 is provided, during the core self-absorption experiment, the core to be tested is placed on the filter screen 104, and the pre-set dyeing liquid permeates through the third through hole on the filter screen 104 to immerse the core to be tested.

[0075] In one embodiment, such as Figure 6 and Figure 7 As shown, both the first sealing assembly 203 and the second sealing assembly 204 are T-shaped and each includes a first rubber stopper 2031, a second rubber stopper 2032 and a third rubber stopper 2033 that are integrally connected from top to bottom.

[0076] The upper surface of the first rubber stopper 2031 is in contact with the first pressure plate 2022, and the lower surface is in contact with the visual housing 201 and the protective cover 207.

[0077] A sealing gasket 2036 is provided between the lower surface of the first rubber stopper 2031, the outer side of the second rubber stopper 2032 and the visualization housing 201 to form a seal between the first rubber stopper 2031, the second rubber stopper 2032 and the visualization housing 201;

[0078] The diameter of the third rubber stopper 2033 is slightly larger than that of the second rubber stopper 2032. The third rubber stopper 2033 is provided with a rubber ring groove 2034. A sealing rubber ring 2035 is provided between the rubber ring groove 2034 and the visual housing 201 to form a seal between the rubber stopper groove 2034 and the visual housing 201.

[0079] In one embodiment, such as Figure 1-3 As shown, the device also includes a protective cover 207, which is disposed on the outside of the visualization housing 201 and is fixed at both ends to the first sealing component 203 and the second sealing component 204, respectively.

[0080] The protective cover 207 is provided with at least one hollow area 208. During the core experiment, the self-absorption process of the core sample can be observed through the at least one hollow area 208, making the self-absorption process visible.

[0081] In one embodiment, both ends of the protective cover 207 are provided with sealing grooves, and a first sealing ring (not shown in the figure) is provided between the first rubber plug portion 2031 of the first sealing component 203 and the sealing groove to form a seal between the lower surface of the first rubber plug portion 2031 of the first sealing component 203 and the upper surface of the protective cover 207; a second sealing ring (not shown in the figure) is provided between the first rubber plug portion 2031 of the second sealing component 204 and the sealing groove to form a seal between the upper surface of the first rubber plug portion 2031 of the second sealing component 204 and the lower surface of the protective cover 207.

[0082] In one embodiment, such as Figure 9-10 As shown, the core test dish also includes a support tube 105 disposed at the bottom of the test dish body 101;

[0083] The support tube 105 is disposed on the outside of the liquid guide tube 102 and fixed to the second sealing assembly 204;

[0084] The support tube 105 is provided with at least one first through hole 106 to allow the annulus between the liquid guide tube 102 and the support tube 105 to communicate with the visualization housing 201. The arrangement and number of the first through holes 106 can be set according to actual needs, and are not limited in this embodiment of the invention. As a specific implementation, two rows of first through holes 106 can be symmetrically arranged on both sides of the support tube 105, with three first through holes 106 in each row.

[0085] In one embodiment, such as Figure 9-10 As shown, the second sealing assembly 204 is provided with a drain hole 209. The drain hole 209 is used to drain liquid above the second sealing assembly 204. The location of the drain hole 209 can be set according to actual needs. As a specific embodiment, for example... Figure 7 As shown, the drain hole 209 is an eccentric through hole, located on the outer periphery of the injection hole 206.

[0086] In one embodiment, such as Figure 1 As shown, the clamping assembly 202 includes a connector 2021, a first pressure plate 2022, and a second pressure plate 2023;

[0087] The first pressure plate 2022 and the second pressure plate 2023 are connected by the connector 2021;

[0088] The first pressure plate 2022 is fixed to the first sealing assembly 203, and the second pressure plate 2023 is fixed to the second sealing assembly 204.

[0089] In this invention, the connection methods between the first pressure plate 2022, the second pressure plate 2023, and the connecting member 2021 include, but are not limited to, threaded connections, keyed connections, etc. Taking a threaded connection as an example, the connecting member 2021 is a long screw with external threads at both ends, and the nut has a matching internal thread. The connecting member 2021 is fixed to the first pressure plate 2022 and the second pressure plate 2023 by the nut. At the same time, the long screw and the nut are fixed sequentially according to a diagonal principle to ensure that the force on each screw is balanced.

[0090] In one embodiment, the bottom of the experimental dish body 101 is provided with a second through hole 107, which is connected to the liquid guide tube 102.

[0091] The inner diameter of the liquid guide tube 102 is greater than or equal to the diameter of the second through hole 107. By setting the inner diameter of the liquid guide tube 102 to be greater than or equal to the diameter of the second through hole 107, the liquid in the liquid guide tube 102 is transported into the experimental dish body 101, preventing leakage.

[0092] In one embodiment, the air injection port 205 is fitted with a first thread to connect to an external air injection pipeline;

[0093] The injection hole 206 is provided with a second thread and a third thread. The second thread is used to connect the liquid guide tube 102, and the third thread is used to connect the injection pipeline.

[0094] The drain hole 209 is fitted with a fourth thread for connecting the drain pipe.

[0095] Based on the same inventive concept, embodiments of the present invention provide a core self-absorption testing system, such as... Figure 13 As shown, it includes a constant temperature container, a gas source, a liquid injection mechanism, a four-way pipe fitting, a pressure gauge, a first valve V1, a second valve V2, a third valve V3, and the core self-priming experimental device as described above.

[0096] The core self-absorption experimental device is set inside the constant temperature container;

[0097] The four-way fitting is connected to the air injection port, the first valve V1, the second valve V2 and the pressure gauge P respectively;

[0098] The first valve V1 is connected to the gas source; the gas source can be nitrogen.

[0099] The third valve V3 is located on the connecting pipe between the injection hole 206 and the injection mechanism.

[0100] The specific structures of the first valve V1, the second valve V2, the third valve V3, and the fourth valve V4 in this embodiment of the invention can be referred to the description in the prior art, and are not specifically limited here. For example, they can be needle valves.

[0101] In one embodiment, the system further includes a fourth valve V4 and an intermediate container, the fourth valve V4 being disposed on the connecting pipeline between the drain hole 209 and the intermediate container.

[0102] Based on the same inventive concept, embodiments of the present invention provide a core self-absorption testing method, using the core self-absorption testing system described above, including:

[0103] Place the core sample to be tested in the experimental dish body 101; connect the first sealing component 203 to the visualization shell 201, put the protective cover 207 on the outside of the visualization shell 201, press the first pressure plate 2022 on the protective cover 207, connect the first pressure plate 2022 and the second pressure plate 2023, and close V1, V2, V3 and V4.

[0104] Set the temperature of the constant temperature container to a preset experimental temperature and stabilize it for a first preset time. The preset experimental temperature and the first preset time can be set according to actual needs, such as the first preset time being 2 hours.

[0105] Open the first valve V1 and inject gas into the visualization housing 201 until the pressure inside the visualization housing 201 reaches the first preset pressure;

[0106] Close the first valve V1, open the third valve V3, and start the liquid injection mechanism to inject a preset colored fluid into the liquid injection hole 206 at a first preset speed until the liquid level in the experimental dish body 101 is flush with the upper end surface of the experimental dish body 101, and keep the liquid level in the experimental dish body 101 stable; the liquid injection mechanism can be a jet pump.

[0107] The self-absorption height of the core sample is recorded at preset time intervals; the experimental process is recorded in real time using an imaging device to observe the self-absorption height of the core sample, with the preset color fluid being a dyeing liquid.

[0108] The preset fluid is pumped in at a second preset speed to ensure that the liquid level in the core test dish remains constant; wherein, the first preset speed is greater than the second preset speed;

[0109] Open the fourth valve to drain the liquid above the second sealing assembly into the intermediate container;

[0110] The injection mechanism will be shut down after a preset experimental time.

[0111] In one embodiment, before setting the temperature of the thermostatic container to a preset experimental temperature and maintaining it for a first preset time, the method further includes:

[0112] Gas is injected into the visualization housing 201 until the pressure inside the housing reaches a second preset pressure, and then left to stand for a second preset time to check the airtightness of the housing 201. When the pressure gauge monitors that the pressure inside the housing 201 reaches the second preset pressure, the first valve is closed. If, after standing for a second preset time, the pressure inside the housing 201 remains at the second preset pressure, the device is considered to have good airtightness, and the pressure test is complete. The second preset time and the second preset pressure can be set according to actual needs, such as a second preset pressure of 30 MPa and a second preset time of 1 hour.

[0113] In one embodiment, the method further includes:

[0114] Drain the liquid in the experimental dish body 101 to below the lower end face of the rock core to be tested, and close the third valve V3;

[0115] Open the second valve V2 to release the pressure inside the visualization housing 201 and remove the core sample to be tested.

[0116] In one embodiment, the method further includes: opening the fourth valve V4 to discharge the liquid above the second sealing assembly into the intermediate container by gravity.

[0117] The core self-absorption test method provided in this invention realizes the self-absorption experiment of the core under pore pressure by using a pressure-resistant and visual core self-absorption experimental device; the liquid level of the core to be tested is kept constant during the experiment by using a core test dish with a constant liquid level; and the self-absorption liquid level is observed by attaching a scale to the side of the core test dish.

[0118] The specific implementation of the core self-absorption test method provided in the embodiments of the present invention can be referred to the detailed description of the core self-absorption experimental device in the above embodiments. Of course, in the implementation process, those skilled in the art can also refer to the detailed description in the prior art. Where there are repetitions, they will not be repeated.

[0119] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A core self-absorption experimental device, characterized in that, Includes a core testing dish, a visualization shell, a clamping assembly, a first sealing assembly, and a second sealing assembly; The first sealing assembly and the second sealing assembly respectively seal both ends of the visible housing; The first sealing assembly and the second sealing assembly are fixed to the clamping assembly; The core experimental dish is housed within the visualization shell; The first sealing component is provided with an injection port and is connected to the visualization shell. It is used to control the pressure inside the visualization shell to be pore pressure by controlling the volume of gas injected into the visualization shell, thereby simulating the pore pressure environment of the target rock reservoir. The core test dish includes the test dish body, the liquid guide tube, and the measuring device; The liquid guide tube is located at the bottom of the experimental dish body; The second sealing component is provided with a liquid injection hole, and the liquid guide tube is connected to the liquid injection hole for injecting a preset color fluid through the liquid injection hole, so that the liquid level in the experimental dish body is constant so that the rock core to be tested is always immersed in the preset color fluid. The measuring device is fixed to the outer periphery of the experimental dish.

2. The core self-absorption experimental apparatus according to claim 1, characterized in that, The core test dish also includes a filter screen, which is disposed within the body of the test dish.

3. The core self-absorption experimental apparatus according to claim 1, characterized in that, The device also includes a protective cover, which is disposed on the outside of the visualization housing and is fixed at both ends to the first sealing assembly and the second sealing assembly, respectively. The protective cover has at least one open area.

4. The core self-absorption experimental apparatus according to claim 1, characterized in that, The core test dish also includes a support tube disposed at the bottom of the test dish body; The support tube is disposed on the outside of the liquid guide tube and fixed to the second sealing assembly; The support tube is provided with at least one first through hole so that the annulus between the liquid guide tube and the support tube communicates with the visualization shell.

5. The core self-absorption experimental apparatus according to claim 1, characterized in that, The second sealing component is provided with a drain hole.

6. The core self-absorption experimental apparatus according to claim 1, characterized in that, The clamping assembly includes a connector, a first pressure plate, and a second pressure plate; The first pressure plate and the second pressure plate are connected by the connecting member; The first pressure plate is fixed to the first sealing assembly, and the second pressure plate is fixed to the second sealing assembly.

7. The core self-absorption experimental apparatus according to claim 1, characterized in that, The bottom of the experimental dish body is provided with a second through hole, which is connected to the liquid guide tube; The inner diameter of the liquid guide tube is greater than or equal to the diameter of the second through hole.

8. A core self-absorption testing system, characterized in that, It includes a constant temperature container, a gas source, a liquid injection mechanism, a four-way pipe fitting, a pressure gauge, a first valve, a second valve, a third valve, and a core self-priming experimental device as described in any one of claims 1-7; The core self-absorption experimental device is set inside the constant temperature container; The four-way fitting is connected to the air injection port, the first valve, the second valve, and the pressure gauge, respectively. The first valve is connected to the gas source; The third valve is located on the connecting pipe between the injection hole and the injection mechanism.

9. The core self-absorption testing system according to claim 8, characterized in that, The system also includes a fourth valve and an intermediate container, wherein the fourth valve is disposed on the connecting pipe between the drain hole and the intermediate container.

10. A method for core self-absorption testing, characterized in that, Using the core self-absorption testing system as described in any one of claims 8-9, comprising: Place the rock core to be tested into the experimental dish body; Set the temperature of the constant temperature container to a preset experimental temperature and stabilize it for a first preset time; Open the first valve and inject gas into the visualization housing until the pressure inside the visualization housing reaches the first preset pressure; Close the first valve, open the third valve, start the liquid injection mechanism, and inject a preset colored fluid into the injection hole at a first preset speed until the liquid level in the experimental dish body is flush with the upper surface of the experimental dish body, and keep the liquid level in the experimental dish body stable. Record the self-absorption height of the core sample at preset time intervals; The injection mechanism will be shut down after a preset experimental time.

11. The core self-absorption water testing method according to claim 10, characterized in that, The method further includes: Drain the liquid in the experimental dish to below the lower end of the core sample, and close the third valve; Open the second valve to release the pressure inside the visualization shell and remove the core sample to be tested.

12. The core self-absorption water testing method according to claim 10, characterized in that, Before setting the temperature of the constant-temperature container to a preset experimental temperature and maintaining it for a first preset time, the method further includes: Gas is injected into the visualization housing until the pressure inside the visualization housing reaches a second preset pressure, and the housing is left to stand for a second preset time to check its airtightness.

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