Method for measuring gas-water-oil three-phase contact angle distribution and evolution characteristics in reservoir porous media

By employing micro-nano CT imaging technology and image processing methods, the problem of accuracy in measuring the three-phase contact angle within porous media in oil reservoirs was solved. This enabled precise measurement of the three-phase contact angle and wettability analysis within porous media in oil reservoirs, thereby improving the prediction accuracy of multiphase flow models.

CN120846943BActive Publication Date: 2026-06-26DALIAN UNIV OF TECH
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Patent Information

Application Number
CN202511005837.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-22
Publication Date
2026-06-26
Estimated Expiration
2045-07-22

AI Technical Summary

Technical Problem

Existing technologies cannot accurately measure the distribution of the gas-water-oil three-phase contact angle in the porous media of oil reservoirs in situ, nor can they characterize the spatial distribution characteristics of the contact angle of the porous media of oil reservoirs under mixed wetting conditions.

Method used

By employing micro-nano CT imaging technology combined with three-phase fluid seepage experiments and image processing, the distribution and evolution characteristics of the gas-water-oil three-phase contact angle in the porous media of the reservoir were measured through micro-nano CT scanning and CT image processing analysis.

Benefits of technology

It enables accurate and convenient measurement of the three-phase contact angle in porous media of oil reservoirs, reveals the local wetting reversal caused by fluid infiltration, provides reliable wettability data, and provides accurate parameters for pore-scale multiphase flow simulation.

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Abstract

The method for measuring the distribution and evolution characteristics of gas-water-oil three-phase contact angle in oil reservoir porous media belongs to the technical field of oil and gas exploitation and wettability measurement. The method is based on micro-nano CT imaging technology, through three-phase fluid seepage experiment, micro-nano CT scanning, CT image processing and analysis, and finally the statistical distribution characteristics of gas-water-oil three-phase contact angle in oil reservoir porous media under different flow states are obtained. By real-time acquisition of the interface state in the seepage process, in-situ, real and efficient measurement of three-phase contact angle is realized, which can reveal the seepage-induced wettability transition and local wettability reversal phenomenon. The fine division of water-wet, oil-wet and gas-wet pore space in oil reservoir porous media can be realized; the measurement results can provide reliable wettability data for pore-scale multiphase seepage simulation. Since the measurement results are the statistical characteristics of a large number of local contact angles, the authenticity and statistical accuracy of the contact angle measurement are significantly improved.
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