Device for acquiring and testing microcosmic distribution image of remaining oil in porous medium

Abstract

The invention discloses a device for acquiring and testing a microcosmic distribution image of remaining oil in a porous medium (rock). The device comprises a micro injecting system, an oil-water seepage simulating system, a chromatography scanning and imaging system and an output fluid separating and metering system, wherein the micro injecting system is used for controlling test conditions (displacement flowing speed and injection multiple) of a displacement simulation test; the oil-water seepage simulating system is a sand filling tube model and is used for providing a porous medium environment for oil-water displacement; the chromatography scanning and imaging system is used for realizing acquisition of the microcosmic distribution image of the remaining oil inside a rock core in the oil-water displacement process; and the output fluid separating and metering system is used for realizing separation and metering of fluid at an outlet end of the rock core. Based on a chromatography technique and on premise that a rock core model is not damaged, the acquisition of the microcosmic distribution image of the remaining oil in the porous medium is realized. The device is strong in practicability, quantification description on the microcosmic distribution state of the remaining oil in the rock core can be conducted on the basis of the acquired image, and an effective tool for the research on further improving the oil recovery is provided.

Description

technical field [0001] The invention relates to an experimental device in the field of petroleum development, in particular to an experimental device for image acquisition of the microscopic distribution of remaining oil in a porous medium. Background technique [0002] Due to the differences in pore structure, rock wettability, injection method and other conditions, a considerable part of crude oil stays in reservoir pores and particle surfaces during oilfield development to form residual oil. The research on the microscopic distribution of remaining oil is of great significance for the potential exploitation of remaining oil and the enhancement of oil recovery. [0003] At present, the commonly used research methods for the microscopic distribution of remaining oil in porous media include glass etching model (GMM), core micromodel (SMM) and nuclear magnetic resonance imaging (NMR). The glass etching model can more realistically reflect the microscopic pore structure of th...

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Problems solved by technology

The glass etching model can truly reflect the microscopic pore structure of rocks, and the microscopic distribution of remaining oil can be directly observed and described through a microscope, but the rock surface properties and pore geometric characteristics of this model are still far from those of real core difference; the core micro model uses the actual core thin section to make a micro visual model, but the image definition of the model is poor; the above two methods are based on the two-dimensional micro model to study the remaining oil in a certain seepage section, which cannot reflect the Real distribution state of remaining oil in three-dimensional space

As a mature non-destructive testing technology, nuclear magnetic resonance imaging can quantitatively describe the spatial distribution of fluid in oil and gas reservoirs in three-dimensional space, but the imaging resolution of this technology is limited, and it cannot achieve the microscopic distribution of remaining oil in the pore level. State Research Standards

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