Real-time acquisition experimental device for flowing foam structural images in porous media

Abstract

The invention discloses a real-time acquisition experimental device for flowing foam structural images in porous media (rocks), which comprises a gas-liquid injecting system, a foam seepage simulation system, an image acquisition system and an output fluid separation metering system, wherein the gas-liquid injecting system is used for providing the fluid condition of a foam seepage simulation experiment; the foam seepage simulation system is used for simulating the environment of porous media of foam seepage and monitoring pressure data in the simulation process; the image acquisition system is used for acquiring foam microstructure images in the process of the foam seepage; and the output fluid separation metering system is used for separating and metering output fluid at a rock outlet automatically. Aiming at foam seeped in the real rocks in the high-pressure experimental state, the real-time dynamic observation and image acquisition of a foam microstructure are realized. The real-time acquisition experimental device has high practicability, performs quantitative description on a foam structure on the basis of the image acquisition, and provides an effective tool for developing microcosmic flowing study on foam in the porous media.

Description

technical field [0001] The invention relates to an experimental device in the field of petroleum development, in particular to an experimental device for collecting images of flowing foam structures in porous media (rocks). Background technique [0002] Foam flooding is an oil displacement method that uses nitrogen, natural gas or other gases mixed with foaming agents to form foam as the oil displacement medium. This technology can effectively enhance oil recovery, and it has gradually become one of the main enhanced oil recovery technologies after polymer flooding technology in eastern oilfields of my country. However, the microscopic seepage of foam system in porous media is a very complicated process, which involves the mechanism of foam generation, migration, collapse and regeneration in porous media. It is of great significance to deeply study the change of foam shape and structure when foam fluid seeps in porous media. [0003] At present, the commonly used research ...

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Problems solved by technology

However, the microscopic etching model has the following limitations: (1) the model is not resistant to high pressure, and usually can only be tested under normal pressure (standard atmospheric pressure or slightly higher than standard atmospheric pressure), and the influence of pressure on the foam structure cannot be considered; (2) This model is a two-dimensional model, and the glass material reflects the enlarged rock pore throat characteristics, which cannot accurately reflect the porous medium characteristics of real rocks

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