Loose core permeability testing device

Abstract

The utility model relates to a loose core permeability testing device, and belongs to the technical field of loose core porosity detection equipment. The loose core permeability testing device comprises a core holder, a confining pressure pump, a booster pump, a high-pressure storage tank, a valve control group, a gas-liquid separation tank, a dryer and a flow detector, the middle part of the core holder is connected with a confining pressure pump through a pipeline; one end of the core holder is sequentially connected with an infiltration tank, a valve control group, a high-pressure storage tank and a booster pump through a pipeline and a switch valve; the other end of the core holder is connected with a gas-liquid separation tank; the rock core permeability testing device is compact in structure and ingenious in design, the problems that an existing rock core permeability testing device is relatively few in detection function and low in detection precision are solved, and the rock core permeability testing device is particularly suitable for the use requirement of loose rock core permeability testing.

Description

Technical Field

[0001] The utility model relates to a loose core permeability testing device, belonging to the technical field of loose core porosity detection equipment. Background Technique

[0002] In the field of oil and gas exploitation, in order to understand the bottom structure, it is necessary to detect the permeability of the core. The existing permeability testing devices, such as a core permeability testing experimental device disclosed in the invention patent application with the application publication number CN117990586A, although it can meet the use requirements of permeability testing to a certain extent, there are the following problems:

[0003] First: The existing permeability testing experimental device can only complete the detection of gas-phase fluids and cannot meet the detection of liquid-phase fluids, having the problem of relatively few detection functions.

[0004] Second: The technical solution of the existing permeability testing experimental device is that gas enters the core in the holder at a certain pressure and then penetrates the core, and the volume of the penetrated gas is detected. Although this method can meet the needs of detection to a certain extent, it detects the state of the core in a dry condition during detection, but in actual working conditions, the core is generally in a wet state, so there is the problem of low detection accuracy.

[0005] Therefore, it is necessary to develop a new testing device to solve the above problems existing in the existing core permeability testing device. Summary of the Invention

[0006] The purpose of the utility model is to provide a loose core permeability testing device with a compact structure and ingenious design, which solves the problems of relatively few detection functions and low detection accuracy existing in the existing core permeability testing device.

[0007] The technical solution of the utility model is:

[0008] A loose core permeability testing device includes a core holder, an confining pressure pump, a booster pump, a high-pressure storage tank, a valve control group, a gas-liquid separation tank, a dryer, and a flow detector; the middle of the core holder is connected with an confining pressure pump through a pipeline; it is characterized in that: one end of the core holder is sequentially connected with a soaking tank, a valve control group, a high-pressure storage tank, and a booster pump through a pipeline and a switching valve; the other end of the core holder is connected with a gas-liquid separation tank; one end of the gas-liquid separation tank is connected in parallel with a dryer through an isolation valve; one end of the dryer is sequentially connected with a measuring valve and a flow detector.

[0009] The described valve control group includes a high-pressure control valve, a high-pressure pressure regulator, a medium-pressure pressure regulator, and a low-pressure pressure regulator; one end of the high-pressure storage tank is connected in parallel with three groups of high-pressure control valves; one end of a group of high-pressure control valves is connected in series with a high-pressure pressure regulator, one end of a group of high-pressure control valves is connected in series with a medium-pressure pressure regulator, and one end of another group of high-pressure control valves is connected in series with a low-pressure pressure regulator; one ends of the high-pressure pressure regulator, the medium-pressure pressure regulator, and the low-pressure pressure regulator are connected to the infiltration tank through pipelines.

[0010] The interior of the described infiltration tank is filled with infiltration liquid; one end of the pipeline at the output end of the valve control group is inserted below the liquid level of the infiltration liquid; one end of the pipeline at one end of the core holder is located above the infiltration liquid in the infiltration tank.

[0011] The pipelines at the end of the described core holder and at one end of the isolation valve are both connected to the upper end of the gas-liquid separation tank.

[0012] The head end of the described core holder is sequentially connected with an intermediate container and a liquid supplement pump through a liquid phase valve.

[0013] An isolation piston is slidably arranged in the middle of the described intermediate container.

[0014] The advantages of the present utility model are as follows:

[0015] This loose core permeability testing device has a compact structure and ingenious design. It can not only test the gas-phase permeability but also test the liquid-phase permeability under the state of core infiltration, thus solving the problems of relatively few detection functions and low detection accuracy existing in the existing core permeability testing devices, and is particularly suitable for the needs of loose core permeability testing. Brief Description of the Drawings

[0016] Figure 1 is a structural schematic diagram of the present utility model;

[0017] Figure 2 is Figure 1 the enlarged structural schematic diagram at A in

[0018] Figure 3 is Figure 1 the enlarged structural schematic diagram at B in

[0019] Figure 4 is Figure 1 the enlarged structural schematic diagram at C in

[0020] In the figure: 1. Core holder; 2. Confining pressure pump; 3. On-off valve; 4. Infiltration tank; 5. Valve control group; 6. High-pressure storage tank; 7. Booster pump; 8. Gas-liquid separation tank; 9. Isolation valve; 10. Dryer; 11. Measuring valve; 12. Flow detector; 13. High-pressure control valve; 14. High-pressure pressure regulating valve; 15. Medium-pressure pressure regulating valve; 16. Low-pressure pressure regulating valve; 17. Infiltration liquid; 18. Intermediate container; 19. Make-up pump; 20. Isolation piston. Specific implementation mode

[0021] The loose core permeability testing device includes a core holder 1, a confining pressure pump 2, a booster pump 7, a high-pressure storage tank 6, a valve control group 5, a gas-liquid separation tank 8, a dryer 10 and a flow detector 12 (see the attached Figure 1 ).

[0022] The middle part of the core holder 1 is connected with a confining pressure pump 2 through a pipeline; the core holder 1 and the confining pressure pump 2 are off-the-shelf equipment.

[0023] One end of the core holder 1 is connected with an infiltration tank 4, a valve control group 5, a high-pressure storage tank 6 and a booster pump 7 in sequence through a pipeline and an on-off valve 3 (see the attached Figure 1 ).

[0024] The valve control group 5 includes a high-pressure control valve 13, a high-pressure pressure regulating valve 14, a medium-pressure pressure regulating valve 15 and a low-pressure pressure regulating valve 16; one end of the high-pressure storage tank 6 is connected in parallel with three groups of high-pressure control valves 13; one end of a group of high-pressure control valves 13 is connected in series with a high-pressure pressure regulating valve 14, one end of a group of high-pressure control valves 13 is connected in series with a medium-pressure pressure regulating valve 15, and one end of another group of high-pressure control valves 13 is connected in series with a low-pressure pressure regulating valve 16; one ends of the high-pressure pressure regulating valve 14, the medium-pressure pressure regulating valve 15 and the low-pressure pressure regulating valve 16 are connected with the infiltration tank 4 through pipelines (see the attached Figure 4 ).

[0025] The purpose of setting the valve control group 5 like this is that during operation, the high-pressure pressure regulating valve 14, the medium-pressure pressure regulating valve 15 or the low-pressure pressure regulating valve 16 can be determined according to the experimental conditions, that is, the experimental air pressure of the experimental gas, so that the experimental air pressure can be more accurately controlled through the high-pressure pressure regulating valve 14, the medium-pressure pressure regulating valve 15 or the low-pressure pressure regulating valve 16.

[0026] The inside of the infiltration tank 4 is filled with an infiltration liquid 17 (see the attached Figure 1 and 2); One end of the pipeline at the output end of the valve control group 5 is inserted below the liquid level of the infiltration liquid 17; One end of the pipeline of the core holder 1 is located above the infiltration liquid 17 in the infiltration tank 4. The purpose of setting the infiltration tank 4 in this way is: to enable the experimental gas to enter the interior of the infiltration liquid 17 during operation, be infiltrated into a wet gas, and then enter the interior of the core holder 1. In this way, it can be avoided that the experimental gas is a dry gas, which may adsorb the internal liquid of the core after entering the core holder 1, resulting in inaccurate detection.

[0027] The other end of the core holder 1 is connected to a gas-liquid separation tank 8; One end of the gas-liquid separation tank 8 is connected in parallel with a dryer 10 through an isolation valve 9; One end of the dryer 10 is sequentially connected to a measurement valve 11 and a flow detector 12 (see the attached Figure 1 ).

[0028] The pipeline at the end of the core holder 1 and the pipeline at one end of the isolation valve 9 are both connected to the upper end of the gas-liquid separation tank 8 (see the attached Figure 3 ).

[0029] The purpose of setting the gas-liquid separation tank 8 and the flow detector 12 in this way is: during operation, when the detected gas drives the liquid inside it to output after passing through the core, the liquid will be collected by the gas-liquid separation tank 8, and after the detected gas is dried by the dryer 10, the flow detector 12 will detect the detected gas. In this way, by collecting the liquid data in the gas-liquid separation tank 8 and the data of the flow detector 12, the test work of the gas-phase core permeability can be completed.

[0030] The first end of the core holder 1 is sequentially connected to an intermediate container 18 and a liquid supplement pump 19 through a liquid phase valve (see the attached Figure 1 ). An isolation piston 20 is slidably arranged in the middle of the intermediate container 18 (see the attached Figure 2 ). During operation, after injecting the detected liquid into the upper part of the intermediate container 18, when the liquid supplement pump 19 fills the intermediate container 18 with clear water, the isolation piston 20 will squeeze the detected liquid to make it enter the core holder 1 to complete the test work of the liquid-phase core permeability.

[0031] When the loose core permeability test device conducts the gas-phase core permeability test, first, the core to be detected is infiltrated so that it contains a certain amount of liquid inside, and then it is placed in the core holder 1.

[0032] After the above process is completed, under the action of the booster pump 7, the experimental gas in the high-pressure storage tank 6 passes through the valve control group 5 and then enters the interior of the wetting liquid 17. After being infiltrated into a wet gas, it enters the interior of the core holder 1. When the wet gas enters the interior of the core holder 1 and the detection gas passes through the core, it will drive the output of the liquid inside it. The liquid will be collected by the gas-liquid separation tank 8. After the detection gas is dried by the dryer 10, the flow detector 12 will detect the detection gas. In this way, by collecting the liquid data in the gas-liquid separation tank 8 and the data of the flow detector 12, the test of the gas-phase core permeability can be completed.

[0033] When the loose core permeability test device conducts the liquid-phase core permeability test, first, the core to be detected is infiltrated so that it contains a certain amount of liquid, and then it is placed in the core holder 1.

[0034] After the above process is completed, the detection liquid is injected into the upper part of the intermediate container 18. Subsequently, the replenishing pump 19 replenishes clear water into the intermediate container 18 to make the isolation piston 20 squeeze the detection liquid so that it enters the core holder 1. After the detection liquid enters the core holder 1, it will drive the liquid inside the core to be input into the gas-liquid separation tank 8 together. Subsequently, by collecting the liquid data in the gas-liquid separation tank 8 and the data of the flow detector 12, the test of the liquid-phase core permeability can be completed.

[0035] The loose core permeability test device has a compact structure and ingenious design. It can not only test the gas-phase permeability under the infiltrated state of the core but also test the liquid-phase permeability, thus solving the problems of relatively few detection functions and low detection accuracy existing in the existing core permeability test devices, and is especially suitable for the needs of loose core permeability test.

Claims

1. A loose core permeability testing device, comprising a core holder (1), an confining pressure pump (2), a booster pump (7), a high-pressure storage tank (6), a valve control group (5), a gas-liquid separation tank (8), a dryer (10) and a flow detector (12); the middle part of the core holder (1) is connected with the confining pressure pump (2) through a pipeline; characterized in that: One end of the described core holder (1) is successively connected with a soaking tank (4), a valve control group (5), a high-pressure storage tank (6) and a booster pump (7) through pipelines and a switching valve (3); the other end of the core holder (1) is connected with a gas-liquid separation tank (8); one end of the gas-liquid separation tank (8) is connected in parallel with a dryer (10) through an isolation valve (9); one end of the dryer (10) is successively connected with a measuring valve (11) and a flow detector (12).

2. The loose core permeability testing device according to claim 1, wherein: The described valve control group (5) includes a high-pressure control valve (13), a high-pressure pressure regulating valve (14), a medium-pressure pressure regulating valve (15) and a low-pressure pressure regulating valve (16); one end of the high-pressure storage tank (6) is connected in parallel with three groups of high-pressure control valves (13); one end of a group of high-pressure control valves (13) is connected in series with a high-pressure pressure regulating valve (14), one end of a group of high-pressure control valves (13) is connected in series with a medium-pressure pressure regulating valve (15), and one end of another group of high-pressure control valves (13) is connected in series with a low-pressure pressure regulating valve (16); one ends of the high-pressure pressure regulating valve (14), the medium-pressure pressure regulating valve (15) and the low-pressure pressure regulating valve (16) are connected with the soaking tank (4) through pipelines.

3. The loose core permeability testing device according to claim 2, characterized in that: The interior of the described soaking tank (4) is filled with a soaking liquid (17); one end of the pipeline at the output end of the valve control group (5) is inserted below the liquid level of the soaking liquid (17); the pipeline at one end of the core holder (1) is located above the soaking liquid (17) in the soaking tank (4).

4. A loose core permeability testing device according to claim 1, characterized in that: The pipelines at the end of the core holder (1) and at one end of the isolation valve (9) are both connected to the upper end of the gas-liquid separation tank (8).

5. The loose core permeability testing device according to claim 1, characterized in that: The first end of the core holder (1) is successively connected with an intermediate container (18) and a liquid supplement pump (19) through a liquid phase valve.

6. The loose core permeability testing device according to claim 5, characterized in that: An isolation piston (20) is slidably arranged in the middle of the described intermediate container (18).

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