A microscopic visualization experimental method for high temperature and high pressure gas flooding in deep reservoirs

Abstract

The invention discloses a microscopic visualization experiment method for high-temperature and high-pressure gas flooding oil in a deep oil reservoir, comprising the following steps: installing a glass etching model for simulating rock samples under actual reservoir conditions in a high-pressure sealing holder, vacuuming; The confining pressure fluid is injected into the confining pressure ring cavity of the layer, and the confining pressure is controlled by the confining pressure tracking pump; the confining pressure fluid in the confining pressure ring cavity of the reservoir is heated and heated by a high temperature heating vessel; the glass etching model is placed under a microscope; The crude oil and the displacing fluid medium were respectively put into the heated thermostatic piston container, and the back pressure unit was adjusted to the simulated formation pressure; the water injection and gas injection displacement experiments were carried out through the high pressure injection pump and the gas booster system. The invention can be used to simulate the oil-water-gas distribution state and fluid migration characteristics in the micro-nano-scale pore structure, quantitatively characterize the microscopic residual oil starting mechanism of high temperature and high pressure water flooding, gas flooding, and chemical flooding, and can be used for oil-water saturation in the process of oilfield reservoir development. The judgment of distribution and size has important guiding significance.

Description

technical field [0001] The invention relates to the technical field of microscopic displacement, in particular to a microscopic visualization experiment method for oil displacement by high temperature and high pressure gas in deep oil reservoirs. Background technique [0002] With more and more exploration and development activities in deeper and more complex formations worldwide, it is more and more difficult to tap the remaining oil under the conditions of deep high temperature and high pressure. Especially when the oilfield enters the stage of high water-cut development, the production declines, and the potential targets for mining and mining change from a large area of ​​connected remaining oil to a highly dispersed but relatively localized area. Due to the unclear understanding of the microscopic occurrence state and distribution law of the remaining oil, Seriously hindered the next step to tap the remaining oil potential. Therefore, it is particularly important to pro...

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Problems solved by technology

However, this technology has great limitations. On the one hand, the rock will be worn during use, and the basic parameters of the rock will change with the experimental process, and the used rock is not easy to wash, and the repeatability is low; in addition, conventional microscopic flooding There are two main problems in the replacement experimental device. One is that due to the deep burial of complex oil reservoirs, high temperature and high pressure (70MPa, 150°C), it is difficult for conventional experimental devices to reproduce the high temperature and high pressure conditions of real reservoirs; on the other hand, Due to the small pore size, it is difficult for conventional experimental devices to intuitively display the migration laws of fluids with different properties in micro-nano-scale channels, and to conduct qualitative and quantitative analysis of the remaining oil distribution laws

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