Breakthrough pressure determination method based on digital core

By using a breakthrough pressure determination method based on digital cores, the problems of data interpretation uncertainty and resource waste in traditional gas storage sealing evaluation have been solved, achieving more accurate and efficient sealing assessment and reducing damage to the rock structure.

CN122238093APending Publication Date: 2026-06-19DAQING OILFIELD CO LTD +1
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Patent Information

Application Number
CN202411859227.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Traditional gas storage sealing evaluation suffers from uncertainties in the interpretation of seismic exploration data and time-consuming and resource-intensive core experiments, and the core sampling process may damage the rock structure.

Method used

A breakthrough pressure determination method based on digital cores was adopted. Experiments were conducted by collecting core samples of caprock mudstone to build a digital core model. Fluent software was used for simulation calculations, and combined with gas-liquid two-phase flow simulation experiments. The model was adjusted until the breakthrough pressure judgment criteria were met, and the breakthrough pressure result was determined.

Benefits of technology

It improves the accuracy and efficiency of sealing performance evaluation, reduces damage to rock structures, and lowers resource consumption.

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Abstract

The invention relates to the technical field of gas storage sealing evaluation, in particular to a breakthrough pressure determination method based on a digital core. The method comprises the following steps: collecting and classifying core samples of the cap rock, carrying out a breakthrough pressure experiment on the core of the cap rock, and recording an experiment result; performing CT scanning on the rock sample, and building a digital rock core experiment model; according to the experimental result and the digital rock core experimental model, a digital rock core simulation calculation model is built in cooperation with a capillary pressure formula; performing simulation calculation on the rock sample through the digital rock core simulation calculation model to obtain a breakthrough pressure predicted value; performing a gas-liquid two-phase flow simulation experiment on the rock sample to obtain a breakthrough pressure experiment value; presetting a breakthrough pressure judgment standard, comparing whether the breakthrough pressure predicted value and the breakthrough pressure experimental value meet the breakthrough pressure judgment standard, if not, adjusting until the breakthrough pressure predicted value and the breakthrough pressure experimental value meet the breakthrough pressure judgment standard, and determining a breakthrough pressure result value. According to the method provided by the invention, the determination precision of the breakthrough pressure is improved by utilizing a digital technology and a numerical simulation method.
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