Foam performance evaluation experiment device with adjustable temperature and pressure

Abstract

The utility model discloses a temperature and pressure adjustable foam performance evaluation experiment device which comprises an input device and a foam liquid performance experiment device which are connected in sequence, the device further comprises a pressure maintaining system and a temperature maintaining system. The foam liquid performance experiment device is a foaming measuring cylinder, the foaming measuring cylinder is of a double-layer structure composed of an inner layer and an outer layer, a closed annular space is formed between the inner layer and the outer layer, and the inner layer is not provided with a top cover; the bubbling measuring cylinder is also provided with a stirring device; the bubbling measuring cylinder is arranged in a closed container, and gaps exist between the side wall and the top of the bubbling measuring cylinder and the inner wall of the container; the pressure maintaining system comprises a gas input system and a gas output system; the gas input system and the gas output system are both connected to the gap, and a back-pressure valve is arranged on the gas output system; the temperature maintaining system is connected with the closed annular space; the device further comprises an observation system arranged between the outer side wall of the bubbling measuring cylinder and the inner side wall of the container. The system has the characteristics of strong systematicness, simplicity and convenience in operation, easiness in maintenance and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield air foam flooding to enhance oil recovery, in particular to a foam performance evaluation experimental device with adjustable temperature and pressure. Background Art

[0002] Air foam flooding is a green and environmentally friendly technology that can effectively improve oil reservoir recovery. It has been applied and promoted in most oil fields at home and abroad due to its many advantages such as wide gas sources, low cost, water conservation and reduction of oilfield wastewater output, and significant increase in crude oil recovery.

[0003] The key to air foam flooding is selecting a foam flooding system with strong foaming capacity and good foam stability that is suitable for the target reservoir conditions. This directly affects the flooding effect. Currently, there are hundreds of foam systems on the market. However, different foam systems are adapted to different reservoir conditions, exhibiting different performance under different reservoir conditions. Therefore, before conducting air foam flooding field trials in an oil field, it is necessary to evaluate the performance of the foam flooding system. Key evaluation indicators include the foaming volume per unit volume of foam liquid, the foam half-life, and the foam decay rate.

[0004] Currently, the main foam performance evaluation methods include the stirring method and the Roche titration method. However, these methods are typically performed at room temperature and atmospheric pressure, making them incapable of evaluating the foaming and stabilization performance of the foam system under specific reservoir temperature and pressure conditions. Furthermore, the commonly used stirring method can only be used to evaluate the performance of air foams, not other gas foams. Summary of the Invention

[0005] The utility model aims to solve the above problems and proposes a foam performance evaluation experimental device with adjustable temperature and pressure, which can realize the performance evaluation of different gas foams under different temperature and pressure conditions, and better meet the actual needs of oil fields.

[0006] The technical solution of the utility model is:

[0007] A foam performance evaluation experimental device with adjustable temperature and pressure, comprising an input device and a foam liquid performance experimental device connected in sequence; and also comprising a pressure maintaining system and a temperature maintaining system;

[0008] The foam liquid performance experimental device is a foaming graduated cylinder. The foaming graduated cylinder has a double-layer structure consisting of an inner layer and an outer layer. A closed annular space is formed between the inner layer and the outer layer, and the inner layer has no top cover. The foaming graduated cylinder is also provided with a stirring device. The foaming graduated cylinder is placed in a closed container, and there is a gap between the side wall and the top of the foaming graduated cylinder and the inner wall of the container.

[0009] The pressure maintenance system includes a gas input system and a gas output system; the gas input system and the gas output system are both connected to the gap, and the gas output system is provided with a back pressure valve;

[0010] The temperature maintenance system is connected to the closed annular space;

[0011] Also included is a viewing system disposed between the outer sidewall of the foaming cylinder and the inner sidewall of the container.

[0012] The temperature maintaining system includes a constant temperature water bath, which is located outside the foam liquid performance experimental device and is connected to the closed annular space.

[0013] The observation system includes a camera electrically connected to an external computer.

[0014] The stirring device includes a stirrer, which is located outside the container and extends into the inner layer of the foaming graduated cylinder through a stirring rod that passes through the container.

[0015] The gas input system includes a gas intermediate container, which is connected to the gap through a gas input pipeline; the gas output system includes a gas cylinder, which is connected to the gap through a gas output pipeline, and a back pressure valve is also provided on the gas output pipeline.

[0016] The input device is a foam liquid intermediate container, and the foam liquid intermediate container is connected to the inner layer of the foaming graduated cylinder through a foam liquid input pipeline.

[0017] The device also includes a plunger pump, which is connected to the foam liquid intermediate container and the gas intermediate container respectively.

[0018] The foam liquid input pipeline is provided with a second check valve, and the gas input pipeline is provided with a first check valve and a pressure gauge.

[0019] The technical effects of the utility model are:

[0020] The utility model injects experimental gas into the gap between the container and the foaming graduated cylinder to maintain the pressure environment for foam performance evaluation, while simultaneously utilizing this gas to generate foam. A temperature maintenance system maintains a relatively constant temperature environment within the foaming graduated cylinder. An observation system, located between the outer wall of the foaming graduated cylinder and the inner wall of the container, dynamically observes and reads data about the foam liquid, and transmits this data to an external computer. This utility model can evaluate the foaming effects and foam performance of different foaming systems under different gas, temperature, and pressure conditions, and is characterized by strong system integration, simple operation, and ease of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a structural diagram of the present utility model.

[0022] Figure numerals: 1. plunger pump; 2. foam liquid intermediate container; 3. gas intermediate container; 4. pressure gauge; 5-1. first one-way valve; 5-2. second one-way valve; 6. constant temperature water bath; 7. agitator; 8. foaming measuring cylinder; 9. back pressure valve; 10. gas cylinder; 11. camera; 12. external computer; 13. container. DETAILED DESCRIPTION

[0023] Example 1

[0024] A foam performance evaluation experimental device with adjustable temperature and pressure, comprising an input device and a foam liquid performance experimental device connected in sequence; and also comprising a pressure maintaining system and a temperature maintaining system;

[0025] The foam liquid performance experimental device comprises a foaming graduated cylinder 8, which has a double-layer structure consisting of an inner layer and an outer layer, a closed annular space formed between the inner layer and the outer layer, and the inner layer has no top cover; the foaming graduated cylinder 8 is also provided with a stirring device; the foaming graduated cylinder 8 is placed in a closed container 13, and there is a gap between the side wall and the top of the foaming graduated cylinder 8 and the inner wall of the container 13;

[0026] The pressure maintaining system includes a gas input system and a gas output system; the gas input system and the gas output system are both connected to the gap, and a back pressure valve 9 is provided on the gas output system;

[0027] The temperature maintenance system is connected to the closed annular space;

[0028] The invention also includes an observation system disposed between the outer wall of the foaming cylinder 8 and the inner wall of the container 13 .

[0029] The specific implementation process of this embodiment is as follows:

[0030] Pour the prepared foam liquid into the input device and introduce the experimental gas into the gas input system; inject the experimental gas in the gas input system into the container 13 until the preset experimental pressure is reached; inject the foam liquid into the foaming graduated cylinder 8 through the input device; activate the temperature maintenance system to raise the temperature of the inner layer of the foaming graduated cylinder 8 to the preset experimental temperature and maintain it;

[0031] Start stirring with the stirring device, and when stirring is completed, observe the initial foaming volume of the foam after stirring and the change of the foam volume with time through the observation system; end the experiment when the volume of the foam decays to half of the initial volume, and this time is the foam half-life; the change of the foam volume with time is the foam decay rate; the foaming performance and stability performance of the foam system are evaluated by combining the initial foaming volume, foam half-life and foam decay rate.

[0032] Example 2

[0033] On the basis of Example 1, the following further features are included:

[0034] The temperature maintenance system includes a constant temperature water bath 6, which is located outside the foam liquid performance experimental device and is connected to the closed annular space.

[0035] Example 3

[0036] On the basis of Example 2, the following is also included:

[0037] The observation system includes a camera 11 , and the camera 11 is electrically connected to an external computer 12 .

[0038] Example 4

[0039] On the basis of Example 3, the following is also included:

[0040] The stirring device includes a stirrer 7 , which is located outside the container 13 . The stirrer 7 extends through the container 13 into the inner layer of the foaming cylinder 8 via a stirring rod.

[0041] Example 5

[0042] On the basis of Example 4, the present invention further includes:

[0043] The gas input system includes a gas intermediate container 3, which is connected to the gap through a gas input pipeline; the gas output system includes a gas cylinder 10, which is connected to the gap through a gas output pipeline, and a back pressure valve 9 is also provided on the gas output pipeline; the input device is a foam liquid intermediate container 2, which is connected to the inner layer of the foaming measuring cylinder 8 through a foam liquid input pipeline.

[0044] Example 6

[0045] On the basis of Example 5, the present invention further includes:

[0046] The invention also includes a plunger pump 1, which is connected to the foam liquid intermediate container 2 and the gas intermediate container 3. The foam liquid input pipeline is provided with a second check valve 5-2, and the gas input pipeline is provided with a first check valve 5-1 and a pressure gauge 4.

[0047] The specific implementation process of this embodiment is as follows:

[0048] The prepared foam liquid is poured into the foam liquid intermediate container 2, and the experimental gas is introduced into the gas intermediate container 3; the plunger pump 1 is started to inject the experimental gas in the gas intermediate container 3 into the container 13 through the gas injection pipeline until the pressure displayed by the pressure gauge 4 reaches the preset experimental pressure; the foam liquid in the foam liquid intermediate container 2 is injected into the foaming measuring cylinder 8 through the foam liquid injection pipeline; after adjusting the heating temperature of the constant temperature water bath 6 to the preset experimental temperature, the hot water circulation switch is turned on, and when the temperature of the constant temperature water bath 6 remains constant, the stirrer 7 starts stirring. When the stirring is completed, the initial foaming volume of the foam after stirring is observed through the camera 11, and the timer of the external computer 12 is started to record the change data of the foam volume over time; the experiment is ended when the foam volume decays to half of the initial volume, and this time is the foam half-life; the change of the foam volume over time is the foam decay rate; the foaming performance and stability performance of the foam system are evaluated by comprehensively considering the initial foaming volume, foam half-life and foam decay rate.

Claims

1. A foam performance evaluation experimental device with adjustable temperature and pressure, comprising an input device and a foam liquid performance experimental device connected in sequence; characterized in that: The foam liquid performance experimental device also includes a pressure maintenance system and a temperature maintenance system; the foam liquid performance experimental device is a foaming measuring cylinder (8), the foaming measuring cylinder (8) is a double-layer structure consisting of an inner layer and an outer layer, a closed annular space is formed between the inner layer and the outer layer, and the inner layer has no top cover; the foaming measuring cylinder (8) is also provided with a stirring device; the foaming measuring cylinder (8) is placed in a closed container (13), and there are gaps between the side walls and the top of the foaming measuring cylinder (8) and the inner wall of the container (13); the pressure maintenance system includes a gas input system and a gas output system; the gas input system and the gas output system are both connected to the gap, and a back pressure valve (9) is provided on the gas output system; the temperature maintenance system is connected to the closed annular space; and an observation system is also provided between the outer wall of the foaming measuring cylinder (8) and the inner wall of the container (13).

2. The temperature and pressure adjustable foam performance evaluation experimental device according to claim 1, characterized in that: The temperature maintaining system comprises a constant temperature water bath (6), which is located outside the foam liquid performance experimental device and is connected to the closed annular space.

3. The temperature and pressure adjustable foam performance evaluation experimental device according to claim 2, characterized in that: The observation system includes a camera (11), and the camera (11) is electrically connected to an external computer (12).

4. The temperature and pressure adjustable foam performance evaluation experimental device according to claim 3, characterized in that: The stirring device comprises a stirrer (7), which is located outside the container (13). The stirrer (7) passes through the container (13) and extends into the inner layer of the foaming cylinder (8) through a stirring rod.

5. The temperature and pressure adjustable foam performance evaluation experimental device according to claim 4, characterized in that: The gas input system comprises a gas intermediate container (3), which is connected to the gap via a gas input pipeline; the gas output system comprises a gas cylinder (10), which is connected to the gap via a gas output pipeline, and a back pressure valve (9) is also provided on the gas output pipeline.

6. The temperature and pressure adjustable foam performance evaluation experimental device according to claim 5, characterized in that: The input device is a foam liquid intermediate container (2), and the foam liquid intermediate container (2) is connected to the inner layer of the foaming measuring cylinder (8) through a foam liquid input pipeline.

7. The temperature and pressure adjustable foam performance evaluation experimental device according to claim 6, characterized in that: It also includes a plunger pump (1), which is connected to the foam liquid intermediate container (2) and the gas intermediate container (3) respectively.

8. The temperature and pressure adjustable foam performance evaluation experimental device according to claim 7, characterized in that: A second check valve (5-2) is provided on the foam liquid input pipeline, and a first check valve (5-1) and a pressure gauge (4) are provided on the gas input pipeline.

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