Displacement experiment fluid control method and displacement experiment device

Abstract

The invention provides a displacement experiment fluid control method and a displacement experiment device. The displacement experiment fluid control method comprises the steps that saturated fluid is poured into an inner model hole channel through an inlet connecting pipe communicated with an inner model of the displacement experiment device until the saturated fluid step is finished, the displacement fluid is directly poured into the inner model hole channel through a pipeline directly communicated with the inner model to achieve the displacement step. The displacement experiment device comprises an outer model and the inner model arranged in the outer model. One end of the inner model hole channel is connected with the inlet connecting pipe which is connected with a saturated fluid conveying device, a fluid switch is arranged on the portion, close to the inlet connecting pipe, of the inner model hole channel, and a control device capable of controlling the fluid switch to be opened and closed is arranged outside the outer model. According to the displacement experiment fluid control method and the displacement experiment device, the displacement fluid can be directly conveyed to the inner model hole channel through the pouring pipeline, the displacement experiment speed is improved, and the experiment precision is improved. The displacement experiment fluid control method and the experiment device are particularly suitable for microcosmic displacement experiments.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development experiments, in particular to a fluid control method for displacement experiments and an experimental device capable of realizing the method. Background technique [0002] The high-temperature and high-pressure microscopic displacement experiment is an important means to study the seepage mechanism of water flooding, gas flooding and chemical flooding. The experiment can not only simulate the reservoir conditions more realistically, but also directly observe the seepage conditions in the reservoir. It is beneficial to summarize the seepage law and provide a reliable reference for the design of reservoir schemes. [0003] The pore throats of the microscopic inner model used in the microscopic displacement experiment are small in size, mostly in the micron scale, and the fine control of the injected fluid has a great influence on the observation effect of the displacement exper...

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Problems solved by technology

[0005] (2) During the displacement process, the saturated fluid A remaining in the inlet connecting pipe 12 will not be displaced in a short time, but will remain on the inner wall of the pipeline for a long time, and will be continuously absorbed during the displacement process. Carrying into the microscopic inner model 10 not only affects the monitoring of the displacement process in the microscopic inner model 10, but also affects the accuracy of the experimental data

[0006] (3) Especially when observing the gas-displacement oil miscibility process, the injected gas will first be miscible with the oil in the inlet connecting pipe 12, and then enter the microscopic internal model 10, which makes it difficult to observe the gas-displacement phase in the microscopic internal model 10. The miscibility process of oil has adversely affected the in-depth study of the miscibility process of gas flooding

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