Nuclear magnetic signal separation method for water in miscible solution in porous medium

The nuclear magnetic signal of water in the mixed solution of ethanol and water in porous media is separated by the difference spectrum method and time domain analysis method of nuclear magnetic resonance technology, which solves the problem of difficulty in accurately measuring the content and distribution changes of water in porous media during mixed phase displacement in the prior art, and achieves support and improvement of gas reservoir development.

CN119780142AActive Publication Date: 2025-04-08PETROCHINA CO LTD
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Patent Information

Application Number
CN202311290159.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-10-08
Publication Date
2025-04-08
Estimated Expiration
2043-10-08

AI Technical Summary

Technical Problem

It is difficult for the prior art to accurately measure the water content and distribution changes in porous media during mixed phase displacement, especially when ethanol displaces water-containing cores.

Method used

Using nuclear magnetic resonance technology, the nuclear magnetic signal of water in the mixed solution of ethanol and water in the porous medium is separated by the difference spectrum method and the time domain analysis method, and the content and distribution of water are quantitatively analyzed.

Benefits of technology

The accurate quantification analysis of water in porous media during the mixed phase displacement process is achieved, and the limitations of water lock effect on gas reservoir development is solved, and the economical and efficient development capacity of gas reservoirs is improved.

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Abstract

The invention discloses a nuclear magnetic signal separation method for water in a miscible solution in a porous medium, and relates to the technical field of fluid flow research, and the method comprises the following steps: S1, selecting a porous medium core sample to be detected, and obtaining the gas logging porosity and permeability of the core; s2, injecting ethanol into the saturated water rock core to simulate a displacement process, and obtaining relaxation time distribution of the rock core; s3, injecting ethanol into the dried rock core, and obtaining relaxation time distribution of the rock core; s4, heavy water is injected into the saturated water rock core, and relaxation time distribution of the rock core is obtained; s5, obtaining relaxation time distribution of water in a mixed solution of ethanol and water; s6, acquiring an ethanol injection PV critical value of a differential spectrum method; s7, obtaining an ethanol injection PV critical value of a time domain analysis method; and S8, selecting a differential spectrum method or a time-domain analysis method to separate a nuclear magnetic signal of water in a mixed solution of ethanol and water in the porous medium. The problem that the content and distribution change of water in the porous medium in the miscible-phase displacement process are difficult to accurately measure by an existing conventional displacement experiment method is solved.
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