Microscopic visual experimental device for simulating fluid displacement under high-temperature and high-pressure conditions

Abstract

The invention discloses a microcosmic visual experimental device for simulating fluid displacement under high-temperature and high-pressure conditions. The microcosmic visual experimental device comprises a reservoir temperature and pressure coordinated control system, a displacement reaction system, a data acquisition and processing system and an auxiliary system. A visual micro-nano scale pore throat model, namely a glass etching model, is adopted to simulate actual rock internal pore throat characteristics, and the flowing behavior of fluid in a micro-nano channel under high-temperature and high-pressure conditions is realized through the reservoir temperature and pressure coordinated control system and the displacement reaction system, the migration characteristics of the micro-fluid in a porous medium are observed in combination with the data acquisition and processing system, so that the quantification of the residual oil-water saturation in the micro-pore structure in the micro-model displacement experiment process is really realized, and the method has important guiding significance for judging the distribution and size of the oil-water saturation in the oil field reservoir development process.

Description

technical field [0001] The invention relates to the technical field of microscopic displacement, in particular to a microscopic visualization experimental device for simulating fluid displacement under high temperature and high pressure conditions. Background technique [0002] With more and more exploration and development activities in deeper and more complex formations around the world, it is becoming more and more difficult to tap the remaining oil potential under high temperature and high pressure conditions in deep formations. Especially when the oilfield enters the period of production decline in the high water-cut development stage, the mining potential target is gradually shifting from the large connected remaining oil to the highly dispersed, localized and relatively enriched areas. Due to unclear understanding of the microcosmic occurrence and distribution of remaining oil, Seriously hindered the remaining oil potential in the next step. Therefore, it is particul...

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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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