Carbon dioxide mixed-phase flushing efficiency and remaining oil distribution evaluation method and isolated plant

Abstract

The invention discloses a carbon dioxide mixed-phase flushing efficiency and remaining oil distribution evaluation method and an isolated plant, and belongs to the technical field of oil-gas field developing experiment. The device is composed of an injection-production simulation system and a data collecting and processing system, wherein the injection-production simulation system is composed of an injection device, a production device, a supercharging device, a closed container which simulates oil deposit and a sample which is arranged inside the closed container and simulates oil deposit core; the data collecting and processing system comprises a light source below a nonopaque passageway of the closed container which simulates the oil deposit and a photographic device above the nonopaque passageway of the closed container which simulates the oil deposit, and the photographic device is connected to a data processing device. The device can be used for studying oil-displacement mechanism of different development modes such as water driving, chemistry driving and gas driving under high temperature and high pressure conditions. The evaluation method can visually evaluate a mixed-phase process of multiple contact between the carbon dioxide and crude oil in the sample, determine flushing efficiency, impact scope and remaining oil distribution of the carbon dioxide drive in the oil deposit, and guide the regulation of the carbon dioxide drive scheme on scene.

Description

technical field [0001] The present invention relates to a CO 2 The utility model relates to an evaluation method and a special device for miscible oil displacement efficiency and remaining oil distribution, belonging to the technical field of oil and gas field development experiments. Background technique [0002] Miscible is CO 2 The key difference between flooding and other gas flooding methods (such as air flooding and nitrogen flooding) is that it can realize CO 2 Efficient oil displacement. Currently, for CO 2 Studies on miscibility with crude oil have mainly focused on CO 2 Determination of minimum miscibility pressure with crude oil, that is, miscibility can be achieved after reaching the minimum miscibility pressure, but it cannot simulate crude oil and CO under the condition of porous media in the reservoir 2 How to miscible, it is impossible to calculate the miscible post-displacement efficiency and analyze the type of remaining oil, which affects the CO 2 Ev...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a CO 2 Miscible flooding efficiency and remaining oil distribution evaluation method to solve the problem of CO in the core existing in the prior art 2 The dynamic miscibility process with crude oil and the unclear distribution of remaining oil

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