Water-oil-gas displacement balance experimental device and experimental method thereof

Abstract

The application discloses a kind of simulation water oil gas displacement balance experimental device and experimental method thereof, simulation water oil gas displacement balance experimental device includes: experimental box;Oil gas hole plate and rock water hole plate, oil gas hole plate and rock water hole plate are divided into oil gas cavity, rock cavity and water cavity by space in experimental box;Oil gas partition, oil gas partition is divided into gas cavity and oil cavity by oil gas cavity, and experimental box is equipped with drain, gas cavity pressure release port and oil cavity pressure release port;Rock sample, rock sample is adapted with the shape of rock cavity;Water pressure bottle, water pressure bottle is communicated with water cavity by water supply pipe;Gas pressure bottle, gas pressure bottle is communicated with gas cavity by gas supply pipe;Oil pressure bottle, oil pressure bottle is communicated with oil cavity by oil supply pipe.Simulation water oil gas displacement balance experimental device according to the embodiment of the application can simulate water oil gas displacement balance relationship under multiple working conditions, with strong applicability and other advantages.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas experiments, in particular to a simulation water-oil-gas displacement balance experiment device and an experiment method of the simulation water-oil-gas displacement balance experiment device. BACKGROUND

[0002] The underground water-sealed storage refers to a special underground engineering that a hole is artificially excavated in a natural rock mass without lining, and the rock mass and fissure water in the rock mass jointly form an oil and gas storage space. The core is to use the fact that the water has a larger specific gravity than oil, so that the water pressure outside the hole is greater than the oil pressure inside the hole, so that the oil cannot seep out of the hole. During the operation period, only oil is imported and exported through pipelines, and the rest of the import and export are all sealed. Once a problem occurs in the storage, there is no maintenance condition, so the water-sealed storage is very strict in limiting the water seepage amount in the hole. In order to ensure that the underground water is not lost and the oil and gas in the hole are not leaked, the water, oil and gas pressures in the hole are required to reach a balanced relationship.

[0003] The water, oil and gas coexist in the main hole of the underground water-sealed storage engineering during the operation period. The water cushion layer at the bottom of the storage is mainly used to adjust the storage pressure in the storage area to maintain the pressure balance among the water, oil and gas, and to ensure the safety and stability during the storage process.

[0004] The related art research on the water-oil-gas displacement experiment is only carried out for the oil displacement mode, oil displacement efficiency and oil displacement mechanism, and lacks displacement experiment research on the water-oil-gas pressure balance in the hole during the operation period. SUMMARY

[0005] The present application aims to at least solve one of the technical problems in the prior art. To this end, the present application provides a simulation water-oil-gas displacement balance experiment device, which can simulate the water-oil-gas displacement balance relationship under various working conditions and has the advantages of strong applicability.

[0006] The present application also provides an experiment method of the simulation water-oil-gas displacement balance experiment device.

[0007] To achieve the above object, the embodiment of the first aspect of the present application provides a simulation water-oil-gas displacement balance experiment device, which comprises: an experiment box; an oil-gas hole plate and a rock-water hole plate, which are arranged in parallel in the experiment box and separate the space in the experiment box into an oil-gas cavity, a rock cavity and a water cavity, the rock cavity is located between the oil-gas hole plate and the rock-water hole plate, and a plurality of through holes are arranged on the oil-gas hole plate and the rock-water hole plate in an array; an oil-gas partition plate, which is arranged in the oil-gas cavity and separates the oil-gas cavity into a gas cavity and an oil cavity, the gas cavity is located above the oil cavity, and the experiment box is provided with a drain port communicating with the rock cavity and being openable and closable, a gas cavity pressure relief port communicating with the gas cavity and being openable and closable, and an oil cavity pressure relief port communicating with the oil cavity and being openable and closable; a rock sample, which is arranged in the rock cavity and is adapted to the shape of the rock cavity; a water pressure bottle, which communicates with the water cavity through a water supply pipe, and the water supply pipe is connected with a water path on-off valve, a water path flow meter and a water path pressure gauge; a gas pressure bottle, which communicates with the gas cavity through a gas supply pipe, and the gas supply pipe is connected with a gas path on-off valve, a gas path flow meter and a gas path pressure gauge, and the gas pressure bottle contains experimental gas; and an oil pressure bottle, which communicates with the oil cavity through an oil supply pipe, and the oil supply pipe is connected with an oil path on-off valve, an oil path flow meter and an oil path pressure gauge, and the oil pressure bottle contains experimental oil.

[0008] The simulation water-oil-gas displacement balance experiment device according to the embodiment of the present application can simulate the water-oil-gas displacement balance relationship under various working conditions and has the advantages of strong applicability.

[0009] In addition, the simulation water-oil-gas displacement balance experiment device according to the above embodiment of the present application can have the following additional technical features.

[0010] According to an embodiment of the present application, a hole plate sealing element is arranged between the oil-gas hole plate and the experiment box.

[0011] According to an embodiment of the present application, a rock sample sealing element is arranged between the rock sample and the experiment box.

[0012] According to an embodiment of the present application, rock sample sealing elements are arranged between the rock sample and the edge of the oil-gas hole plate and between the rock sample and the edge of the rock-water hole plate.

[0013] According to an embodiment of the present application, the rock sample is tightly attached to the oil-gas hole plate.

[0014] According to an embodiment of the present application, at least the part of the experiment box corresponding to the oil cavity is a transparent piece.

[0015] According to one embodiment of the present application, the gas cavity pressure relief port is located at the lower part of the gas cavity, the oil cavity pressure relief port is located at the upper part of the oil cavity, and the drainage port is located at the lower part of the rock cavity and adjacent to the water cavity.

[0016] According to one embodiment of the present application, the experimental box is further provided with an openable and closable oil drainage port communicating with the oil cavity and an openable and closable gas drainage port communicating with the gas cavity.

[0017] According to one embodiment of the present application, the oil drainage port is located at the lower part of the oil cavity, and the gas drainage port is located at the upper part of the gas cavity.

[0018] According to one embodiment of the second aspect of the present application, an experimental method of the simulation water-oil-gas displacement balance experimental device according to one embodiment of the first aspect of the present application is provided, comprising the following steps:

[0019] S1, vacuum water-saturated treatment is performed on the rock sample and the rock sample is placed in the rock cavity;

[0020] S2, the oil path on-off valve, the gas path on-off valve, the gas cavity pressure relief port and the oil cavity pressure relief port are opened, and after the experimental oil fills the oil cavity and the experimental gas fills the gas cavity, the oil path on-off valve, the gas path on-off valve, the gas cavity pressure relief port and the oil cavity pressure relief port are closed;

[0021] S3, the water path on-off valve and the drainage port are opened, and the water path pressure gauge is observed until the detection value of the water path pressure gauge reaches a predetermined water pressure, so that the detection value of the water path pressure gauge is maintained at the predetermined water pressure;

[0022] S4, after the detection value of the water path pressure gauge is stabilized, the oil path on-off valve and the gas path on-off valve are simultaneously opened, so that the detection value of the gas path pressure gauge and the detection value of the oil path pressure gauge are the same and are a predetermined oil-gas pressure;

[0023] S5, when the water path flow meter, the water path pressure gauge, the gas path flow meter, the gas path pressure gauge, the oil path flow meter and the oil path pressure gauge no longer change, after a predetermined time of continuous pressurization, the water path on-off valve, the gas path on-off valve and the oil path on-off valve are closed, the rock sample is taken out, and the distribution of water, experimental oil and experimental gas inside the rock sample is observed by electron computed tomography;

[0024] S6, the instrument is cleaned;

[0025] S7, the above steps S1-S6 are repeated with different predetermined oil-gas pressures, and a water-oil-gas pressure balance control critical value is obtained from the distribution regularity of water, experimental oil and experimental gas inside the rock sample under different predetermined oil-gas pressures.

[0026] The experimental method of the simulation water-oil-gas displacement balance experimental device according to the embodiment of the present application can simulate water-oil-gas displacement balance relationship under various working conditions by using the simulation water-oil-gas displacement balance experimental device according to the embodiment of the first aspect of the present application, and has the advantages of strong applicability.

[0027] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1 FIG. 1 is a structural schematic diagram of a simulation water-oil-gas displacement balance experimental device according to an embodiment of the present application.

[0030] Figure 2 FIG. 2 is a structural schematic diagram of an oil-gas hole plate of a simulation water-oil-gas displacement balance experimental device according to an embodiment of the present application.

[0031] Figure 3 FIG. 3 is a structural schematic diagram of a rock-water hole plate of a simulation water-oil-gas displacement balance experimental device according to an embodiment of the present application.

[0032] Figure 4 FIG. 4 is a flow chart of an experimental method of a simulation water-oil-gas displacement balance experimental device according to an embodiment of the present application.

[0033] FIG. 1 is a structural schematic diagram of a simulation water-oil-gas displacement balance experimental device according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which the same or similar elements have the same or similar reference numbers and in which:

[0035] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the features defined as "first" and "second" can be explicitly or implicitly included one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0036] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The simulation water-oil-gas displacement balance experiment device 1 according to the embodiment of the present application is described below with reference to the drawings.

[0038] As shown in Figures 1-4 The simulation water-oil-gas displacement balance experiment device 1 according to the embodiment of the present application includes an experiment box 10, an oil-gas hole plate 20, a rock-water hole plate 30, an oil-gas partition plate 40, a water pressure bottle 50, a gas pressure bottle 60 and an oil pressure bottle 70.

[0039] The oil-gas hole plate 20 and the rock-water hole plate 30 are arranged in parallel and spaced apart in the experiment box 10, and the oil-gas hole plate 20 and the rock-water hole plate 30 divide the space in the experiment box 10 into an oil-gas cavity, a rock cavity 13 and a water cavity 14, the rock cavity 13 is located between the oil-gas hole plate 20 and the rock-water hole plate 30, and a plurality of through holes 21 arranged in an array are provided on the oil-gas hole plate 20 and the rock-water hole plate 30. Specifically, the oil-gas hole plate 20 and the rock-water hole plate 30 are arranged in parallel along the horizontal direction.

[0040] The oil-gas partition plate 40 is arranged in the oil-gas cavity and divides the oil-gas cavity into a gas cavity 11 and an oil cavity 12, and the gas cavity 11 is located above the oil cavity 12.

[0041] The experimental box 10 is provided with a drain port 17 communicating with the rock cavity 13 and being openable and closable, a gas cavity pressure relief port 15 communicating with the gas cavity 11 and being openable and closable, and an oil cavity pressure relief port 16 communicating with the oil cavity 12 and being openable and closable. Specifically, the gas cavity pressure relief port 15 is used to discharge the original air in the gas cavity 11 when the gas cylinder 60 supplies gas to the gas cavity 11. The oil cavity pressure relief port 16 is used to discharge the original air in the oil cavity 12 when the oil cylinder 70 supplies oil to the oil cavity 12. The drain port 17 is used to discharge the original air in the water cavity 14 when the water cylinder 50 supplies water to the water cavity 14 and to continue to discharge water after the water cavity 14 is filled. Since the water supplied by the water cylinder 50 has a certain pressure, the pressure in the water cylinder 50 is greater than the pressure in the water cavity 14 after the water cavity 14 is filled. If the drain port 17 is closed, the water cylinder 50 will continue to pressurize the water cavity 14, making it difficult to maintain a stable pressure in the water cavity 14. By opening the drain port 17, the pressure in the water cavity 14 can be easily maintained constant. Of course, if the water pressure supplied by the water cylinder 50 can be quickly stabilized, the drain port 17 can also be closed after the water pressure is stabilized.

[0042] The rock sample is arranged in the rock cavity 13 and is adapted to the shape of the rock cavity 13. Specifically, the rock sample is in a whole structure adapted to the shape of the rock cavity 13, for example, the rock cavity 13 is in a cubic shape, and the rock sample is in a cubic shape adapted to the rock cavity 13.

[0043] The water cylinder 50 communicates with the water cavity 14 through a water supply pipe 51, and the water supply pipe 51 is connected with a water path on-off valve 52, a water path flow meter 53, and a water path pressure gauge 54.

[0044] The gas cylinder 60 communicates with the gas cavity 11 through a gas supply pipe 61, and the gas supply pipe 61 is connected with a gas path on-off valve 62, a gas path flow meter 63, and a gas path pressure gauge 64. The gas cylinder 60 contains experimental gas. Those skilled in the art can understand that the experimental gas can be the same as the sealing gas of the underground water-sealed reservoir to be simulated, for example, the underground water-sealed reservoir usually uses nitrogen as the sealing gas, and the experimental gas can be nitrogen.

[0045] The oil cylinder 70 communicates with the oil cavity 12 through an oil supply pipe 71, and the oil supply pipe 71 is connected with an oil path on-off valve 72, an oil path flow meter 73, and an oil path pressure gauge 74. The oil cylinder 70 contains experimental oil. Those skilled in the art can understand that the experimental oil can be the same as the oil stored in the underground water-sealed reservoir to be simulated.

[0046] It should be understood here that the water in the water cylinder 50 is pressurized and filled in the water cylinder 50, the experimental gas in the gas cylinder 60 is pressurized and filled in the gas cylinder 60, and the experimental oil in the oil cylinder 70 is pressurized and filled in the oil cylinder 70.

[0047] Specifically, in the experiment, the rock sample is vacuum saturated and placed in the rock cavity 13, the oil passage on-off valve 72, the gas passage on-off valve 62, the gas cavity pressure relief port 15 and the oil cavity pressure relief port 16 are opened, after the experimental oil fills the oil cavity 12 and the experimental gas fills the gas cavity 11, the oil passage on-off valve 72, the gas passage on-off valve 62, the gas cavity pressure relief port 15 and the oil cavity pressure relief port 16 are closed, the water passage on-off valve 52 and the drain port 17 are opened, the water passage pressure gauge 54 is observed until the detection value of the water passage pressure gauge 54 reaches the predetermined water pressure, the detection value of the water passage pressure gauge 54 is kept at the predetermined water pressure, after the detection value of the water passage pressure gauge 54 is stable, the oil passage on-off valve 72 and the gas passage on-off valve 62 are opened at the same time, the detection value of the gas passage pressure gauge 64 and the detection value of the oil passage pressure gauge 74 are the same and are the predetermined oil-gas pressure, when the water passage flow meter 53, the water passage pressure gauge 54, the gas passage flow meter 63, the gas passage pressure gauge 64, the oil passage flow meter 73 and the oil passage pressure gauge 74 no longer change, the pressure is maintained for a predetermined time, then the water passage on-off valve 52, the gas passage on-off valve 62 and the oil passage on-off valve 72 are closed, the rock sample is taken out, and the distribution of water, experimental oil and experimental gas inside the rock sample is observed by electron computer tomography.

[0048] The above steps are repeated with different predetermined oil-gas pressures, and the water-oil-gas pressure balance control critical value is obtained from the distribution law of water, experimental oil and experimental gas inside the rock sample under different predetermined oil-gas pressures.

[0049] The simulation water-oil-gas displacement balance experiment device 1 according to the embodiment of the present application, by setting the experiment box 10, separating the gas cavity 11, the oil cavity 12, the rock cavity 13 and the water cavity 14 in the experiment box 10, placing the rock sample in the rock cavity 13, and supplying water, gas and oil to the water cavity 14, the gas cavity 11 and the oil cavity 12 by using the water pressure bottle 50, the gas pressure bottle 60 and the oil pressure bottle 70, quickly simulating the balance state of water, oil and gas, and simulating the distribution of water, gas and oil in the rock sample.

[0050] Moreover, the simulation water-oil-gas displacement balance experiment device 1 can control the water passage on-off valve 52, the gas passage on-off valve 62 and the oil passage on-off valve 72 to realize simulation under different pressure conditions, thereby realizing simulation of various conditions under water-oil-gas displacement during the operation of the water-sealed storage, improving the applicability of the simulation water-oil-gas displacement balance experiment device 1, providing parameter basis for water-oil-gas pressure regulation during the operation of the underground water-sealed storage, and also providing technical reference for further evaluation of the stability of the surrounding rock of the underground water-sealed storage during the operation, facilitating the guarantee of the underground water-sealed storage during the operation that the underground water does not seep and lose, the crude oil does not leak, and the gas does not leak, and also providing new experimental means and methods for scientific research in the field of oil and gas storage and transportation engineering, promoting the innovation and development of oil and gas storage and transportation technology.

[0051] Therefore, the simulation water-oil-gas displacement balance experiment device 1 has the advantages of strong applicability and the like.

[0052] The simulation water-oil-gas displacement balance experiment device 1 according to specific embodiments of the present application is described below with reference to the accompanying drawings.

[0053] In some specific embodiments of the present application, as shown in Figures 1-4 The simulation water-oil-gas displacement balance experiment device 1 according to specific embodiments of the present application includes an experiment box 10, an oil-gas hole plate 20, a rock-water hole plate 30, an oil-gas partition plate 40, a water pressure bottle 50, a gas pressure bottle 60 and an oil pressure bottle 70.

[0054] Specifically, as shown in Figure 2 The oil-gas hole plate 20 is provided with a hole plate sealing member 22 between the oil-gas hole plate 20 and the experiment box 10. Specifically, the hole plate sealing member 22 can be a rubber pad. In this way, the sealing performance between the oil-gas hole plate 20 and the experiment box 10 can be improved, and the oil and gas can be conveniently introduced into the rock sample.

[0055] More specifically, the rock sample is provided with a rock sample sealing member (not shown in the figure) between the rock sample and the experiment box 10. In this way, the sealing performance between the rock sample and the experiment box 10 can be improved, and the oil, gas and water can be conveniently introduced into the rock sample.

[0056] Further, the rock sample is provided with a rock sample sealing member (not shown in the figure) between the edge of the oil-gas hole plate 20 and the rock sample and between the edge of the rock-water hole plate 30 and the rock sample. In this way, the oil, gas and water can be further conveniently introduced into the rock sample.

[0057] Specifically, the rock sample sealing member can be a rubber band wound outside the rock sample. In the step of placing the rock sample subjected to vacuum water saturation treatment into the rock cavity 13, if there is a gap between the rock sample and the rock cavity 13, the gap can be filled by winding the rubber band outside the rock sample.

[0058] Further, the rock sample is tightly attached to the oil-gas hole plate 20. In this way, the oil and gas can be further conveniently introduced into the rock sample.

[0059] Advantageously, at least the part of the experiment box 10 corresponding to the oil cavity 12 is a transparent member. In this way, the flow change of the experimental oil in the experiment box 10 can be observed.

[0060] Preferably, the experimental gas can be colored, and at least the part of the experiment box 10 corresponding to the gas cavity 11 and the oil cavity 12 is a transparent member. In this way, the flow change of the experimental oil and the experimental gas in the experiment box 10 can be observed.

[0061] Figure 1A simulation water-oil-gas displacement balance experiment device 1 according to some examples of the present application is shown. As shown in Figure 1 The gas cavity pressure relief port 15 is located at the lower part of the gas cavity 11, which can avoid the experimental gas directly discharged from the gas cavity pressure relief port 15 after the experimental gas filled in the gas cavity 11 when the experimental gas is lighter than air such as nitrogen, and facilitate the experimental gas to fill the gas cavity 11. The oil cavity pressure relief port 16 is located at the upper part of the oil cavity 12, which can avoid the experimental oil directly discharged from the oil cavity pressure relief port 16 after the experimental oil filled in the oil cavity 12, and facilitate the experimental oil to fill the oil cavity 12. The water discharge port 17 is located at the lower part of the rock cavity 13 and adjacent to the water cavity 14, which can facilitate the water in the rock cavity 13 to be discharged and facilitate the pressure in the water cavity 14 to be constant.

[0062] Advantageously, as shown in Figure 1 The experiment box 10 is further provided with an openable and closable oil discharge port 19 communicating with the oil cavity 12 and an openable and closable gas discharge port 18 communicating with the gas cavity 11. Thus, the experimental oil and the experimental gas can be discharged by opening the oil discharge port 19 and the gas discharge port 18 after a test, and the next test can be facilitated.

[0063] More advantageously, as shown in Figure 1 The oil discharge port 19 is located at the lower part of the oil cavity 12, which can facilitate the experimental oil in the oil cavity 12 to be discharged completely, and facilitate the experiment to be performed again. The gas discharge port 18 is located at the upper part of the gas cavity 11, which can facilitate the experimental gas in the gas cavity 11 to be discharged completely when the experimental gas is lighter than air such as nitrogen, and facilitate the experiment to be performed again.

[0064] The experimental method of the simulation water-oil-gas displacement balance experiment device 1 according to the above-mentioned embodiments of the present application is described below, which includes the following steps:

[0065] S1, vacuum water-saturated treatment is performed on the rock sample and the rock sample is placed in the rock cavity;

[0066] S2, the oil path on-off valve, the gas path on-off valve, the gas cavity pressure relief port and the oil cavity pressure relief port are opened, and after the experimental oil fills the oil cavity and the experimental gas fills the gas cavity, the oil path on-off valve, the gas path on-off valve, the gas cavity pressure relief port and the oil cavity pressure relief port are closed;

[0067] S3, the water path on-off valve and the water discharge port are opened, and the water path pressure gauge is observed until the detection value of the water path pressure gauge reaches the predetermined water pressure, and the detection value of the water path pressure gauge is maintained at the predetermined water pressure;

[0068] S4, after the detection value of the water path pressure gauge is stable, the oil path on-off valve and the gas path on-off valve are opened at the same time, and the detection value of the gas path pressure gauge and the detection value of the oil path pressure gauge are the same and are the predetermined oil-gas pressure;

[0069] S5, when the water flow meter, the water pressure gauge, the gas flow meter, the gas pressure gauge, the oil flow meter and the oil pressure gauge are no longer changed, the water on-off valve, the gas on-off valve and the oil on-off valve are closed after the predetermined time of pressure maintaining, the rock sample is taken out, and the distribution of the water, the experimental oil and the experimental gas in the rock sample is observed by the computer tomography;

[0070] S6, cleaning the instrument;

[0071] S7, repeating the steps S1-S6 under different predetermined oil and gas pressures, and obtaining the water-oil-gas pressure balance control critical value by the distribution of the water, the experimental oil and the experimental gas in the rock sample under different predetermined oil and gas pressures.

[0072] Specifically, the predetermined water pressure is 0.5 MPa. The predetermined oil and gas pressure can be 0-1 MPa. For example, 0.1 MPa, 0.3 MPa, 0.5 MPa, 0.7 MPa and 1 MPa. The predetermined time is 6 hours.

[0073] In step S1, if there is a gap between the rock sample and the rock cavity 13, the gap is filled by winding a rubber band around the rock sample.

[0074] In step S4, the waiting time for "waiting for the detection value of the water pressure gauge to be stable" can be 1-2 minutes.

[0075] Before step S6, the experimental oil and the experimental gas can be discharged through the oil discharge port 19 and the gas discharge port 18.

[0076] According to the experimental method of the simulation water-oil-gas displacement balance experimental device 1, the water-oil-gas displacement balance relationship under various working conditions can be simulated by using the simulation water-oil-gas displacement balance experimental device 1 according to the above-mentioned embodiments of the present application, and the method has the advantages of strong applicability.

[0077] Other configurations and operations of the simulation water-oil-gas displacement balance experimental device 1 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0078] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application will be defined with respect to the claims and their equivalents.

Claims

1. A device for simulating water-oil-gas displacement balance, characterized in that, The device comprises: an experimental box; an oil-gas hole plate and a rock-water hole plate, which are arranged in the experimental box in parallel and are spaced apart, and divide the space in the experimental box into an oil-gas cavity, a rock cavity and a water cavity, the rock cavity is located between the oil-gas hole plate and the rock-water hole plate, and a plurality of through holes are arranged on the oil-gas hole plate and the rock-water hole plate in an array; an oil-gas partition plate, which is arranged in the oil-gas cavity and divides the oil-gas cavity into a gas cavity and an oil cavity, the gas cavity is located above the oil cavity, and the experimental box is provided with a drain port which is communicated with the rock cavity and is openable and closable, a gas cavity pressure relief port which is communicated with the gas cavity and is openable and closable, and an oil cavity pressure relief port which is communicated with the oil cavity and is openable and closable; a rock sample, which is arranged in the rock cavity and is matched with the shape of the rock cavity; a water pressure bottle, which is communicated with the water cavity through a water supply pipe, and the water supply pipe is connected with a water path on-off valve, a water path flow meter and a water path pressure gauge; a gas pressure bottle, which is communicated with the gas cavity through a gas supply pipe, and the gas supply pipe is connected with a gas path on-off valve, a gas path flow meter and a gas path pressure gauge, and the gas pressure bottle contains experimental gas; an oil pressure bottle, which is communicated with the oil cavity through an oil supply pipe, and the oil supply pipe is connected with an oil path on-off valve, an oil path flow meter and an oil path pressure gauge, and the oil pressure bottle contains experimental oil.

2. The apparatus of claim 1, wherein, A hole plate sealing element is arranged between the oil-gas hole plate and the experimental box.

3. The apparatus of claim 1, wherein, A rock sample sealing element is arranged between the rock sample and the experimental box.

4. The apparatus of claim 1, wherein, Rock sample sealing elements are arranged between the rock sample and the edge of the oil-gas hole plate and between the rock sample and the edge of the rock-water hole plate.

5. The apparatus of claim 1, wherein, The rock sample is tightly attached to the oil-gas hole plate.

6. The apparatus of claim 1, wherein, At least a portion of the experimental box corresponding to the oil cavity is a transparent piece.

7. The apparatus of claim 1, wherein, The gas cavity pressure relief port is located at the lower part of the gas cavity, the oil cavity pressure relief port is located at the upper part of the oil cavity, and the drain port is located at the lower part of the rock cavity and is arranged adjacent to the water cavity.

8. The apparatus of claim 1, wherein, The experimental box is further provided with an oil discharge port which is communicated with the oil cavity and is openable and closable, and a gas discharge port which is communicated with the gas cavity and is openable and closable.

9. The apparatus of claim 8, wherein, The oil discharge port is located at the lower part of the oil cavity, and the gas discharge port is located at the upper part of the gas cavity.

10. An experimental method of simulating water-oil-gas displacement balance of the experimental device according to any one of claims 1-9, characterized in that, The device comprises the following steps: S1, vacuum water-saturating treatment is performed on a rock sample, and the rock sample is placed in the rock cavity; S2, the oil path on-off valve, the gas path on-off valve, the gas cavity pressure relief port and the oil cavity pressure relief port are opened, and after the experimental oil fills the oil cavity and the experimental gas fills the gas cavity, the oil path on-off valve, the gas path on-off valve, the gas cavity pressure relief port and the oil cavity pressure relief port are closed; S3, the water path on-off valve and the drain port are opened, and the water path pressure gauge is observed until the detection value of the water path pressure gauge reaches a predetermined water pressure, so that the detection value of the water path pressure gauge is maintained at the predetermined water pressure; S4, after the detection value of the water path pressure gauge is stabilized, the oil path on-off valve and the gas path on-off valve are simultaneously opened, so that the detection value of the gas path pressure gauge and the detection value of the oil path pressure gauge are the same and are a predetermined oil-gas pressure. S5, when the water flow meter, the water pressure gauge, the gas flow meter, the gas pressure gauge, the oil flow meter and the oil pressure gauge no longer change, the water on-off valve, the gas on-off valve and the oil on-off valve are closed after the predetermined time of pressure increase, the rock sample is taken out, and the distribution of water, experimental oil and experimental gas inside the rock sample is observed by electron computer tomography; S6, cleaning the instrument; S7, repeating the above steps S1-S6 under different predetermined oil and gas pressures, and obtaining the water, oil and gas pressure balance control critical value through the distribution rule of water, experimental oil and experimental gas inside the rock sample under different predetermined oil and gas pressures.

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