Core holder, molecular diffusion coefficient testing system and method

Abstract

The present invention provides a rock core holder, a molecular diffusion coefficient testing system and a method. The rock core holder includes: a shell with a sealed hollow cavity; a partition that divides the hollow cavity into a first cavity and a second cavity; The first opening communicated with the first cavity, the second opening communicated with the second cavity; the first elastic sleeve connected between the first opening and the partition, composed of the outer periphery of the first elastic sleeve and the housing The inner wall of the inner wall and the wall of the partition form the first confining pressure liquid accommodation area; the second elastic sleeve connected between the second opening and the partition is composed of the outer circumference of the second elastic sleeve, the inner wall of the housing, and The wall of the partition encloses the second confining pressure fluid accommodation area; the experimental channel opened on the partition; the first clamping piece that enters and exits the first elastic sleeve and the second clamping piece that enters and exits the second elastic sleeve. The invention can simulate the actual condition of the reservoir and maintain the temperature change of the whole system, monitor the pressure drop experiment process in the diffusion chamber pressure change in real time, and reduce the experiment measurement error.

Description

Core holder, molecular diffusion coefficient testing system and method technical field The present invention relates to oil field exploitation technical field, relate in particular to a kind of core holder, molecular diffusion coefficient test system systems and methods. Background technique Carbon dioxide huff and puff is one of the ways of effective development of shale reservoirs, and molecular diffusion is the key to improve crude oil production in shale reservoirs. Therefore, the accurate acquisition of molecular diffusion coefficient is of great significance to the enhanced oil recovery of shale reservoirs. In the acquisition of diffusion coefficient, the method of pressure drop experiment is generally adopted, in order to obtain accurate experimental data, During the experiment, the actual condition of the reservoir must be simulated and the temperature change of the whole system must be maintained, and the pressure change must be accurately measured. At pre...

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Problems solved by technology

At present, the pressure drop experiment is carried out in a closed tank, which has the problems of being unable to simulate reservoir conditions and measuring inaccurate pressure changes

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