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Gas-liquid ratio control method of rock core displacement test

A technology of core displacement and gas-liquid ratio, which is applied in earthwork drilling, suspension and porous material analysis, and mining fluid, etc., and can solve the problems of not being able to control the gas-liquid ratio well

Inactive Publication Date: 2007-08-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Therefore, the above two methods have large errors in gas metering and cannot control the gas-liquid ratio well.

Method used

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  • Gas-liquid ratio control method of rock core displacement test

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Embodiment

[0010] Example: In the foam flooding experiment, the ratio of gas-liquid injection needs to be controlled to ensure the physical parameters of the foam. There is no gas pressure detection and automatic boosting function in the common control method. In this way, with the injection of foam, the displacement pressure rises, and because the liquid is basically incompressible, the pressurization is rapid, and the liquid pressure reflects the displacement pressure, while the gas has great compressibility, and the pressure rises slowly. In this way, the pressure of the gas will be lower than the pressure of the liquid, resulting in the situation that only the liquid is injected, but the gas cannot be injected, thus changing the injected gas-liquid ratio and foam parameters. With the method of the present invention, when the gas pressure is lower than a certain value of the liquid pressure, the solenoid valve is controlled by the computer to open, and the gas booster pump is automati...

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Abstract

The invention provides a gas-liquid ratio control method in oil core flooding experiment. A back pressure valve is added at the position of core outlet to control the outlet pressure. At the position of core inlet displacement fluid is injected to control the injecting speed by a metering pump through a middle container. Based on the foundation, pressure sensors are set on the liquid container and gas container respectively to monitor the change of liquid pressure and gas pressure in time. At the same time air booster pump and compensation air source are connected on the air container. When the difference of liquid pressure and air pressure is more than the setting value, the air booster pump is started automatically to supercharge air so that the air pressure is equal to the liquid pressure and it is guaranteed that air can be injected so that the actual displacement of air is equal to the setting displacement and the gas-liquid injecting proportion can be controlled accurately.

Description

Technical field: [0001] The invention relates to a method for controlling the injection gas-liquid ratio in the experiment process, in particular for the gas-liquid ratio control in the oil core displacement experiment. Background technique: [0002] In the process of oil development, it is often necessary to carry out indoor core displacement experiments to evaluate the oil displacement effect and fluid properties. In core displacement experiments that require gas injection, such as foam flooding experiments or gas-mixed water flooding experiments, it is generally necessary to measure the gas injection volume under a certain pressure, or to control the gas-liquid ratio, so as to control the experimental parameters more accurately, reduce experimental errors. The commonly used experimental method is to install a back pressure valve at the outlet of the core to control the outlet pressure, and use a gas mass flow meter at the inlet of the core or inject a displacement fluid ...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/16G01N15/08
Inventor 李宾飞李兆敏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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