A method for determining a moving front and damage distance and a fracture simulation system

By integrating physical simulation and multi-field monitoring, the carbon dioxide migration front and rock damage are monitored in real time, which solves the spatial mismatch problem between the migration front and the rock damage area in the carbon dioxide pre-fracturing process in the prior art. It realizes quantitative spatiotemporal coupling analysis and provides a scientific basis for optimizing process parameters.

CN122358997APending Publication Date: 2026-07-10CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Application Number
CN202610648365.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-12
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies cannot clearly define the spatial mismatch between the migration front and the rock damage area during carbon dioxide pre-fracturing and its main controlling mechanism, leading to a bias in the understanding of the fracturing mechanism and making it difficult to achieve synchronous quantitative monitoring and spatiotemporal coupling analysis of the carbon dioxide migration front and the rock damage boundary.

Method used

By integrating physical simulation and multi-field monitoring, the injection device is controlled to simulate carbon dioxide injection, fracturing fluid injection, and well shut-in operations. Combined with nuclear magnetic resonance imaging, pressure sensing, acoustic emission monitoring, and other means, fluid migration and core damage are monitored in real time to determine the carbon dioxide migration front and damage boundary, calculate damage hysteresis data, and achieve quantitative characterization of spatiotemporal coupling relationship.

Benefits of technology

This study enables in-situ, real-time, and quantitative tracking of carbon dioxide transport fronts and rock damage, solving the problem of asynchronous transport and damage monitoring. It provides quantitative experimental evidence for revealing the transport-damage coupling mechanism and optimizing process parameters.

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Abstract

This invention relates to a method for determining the migration front and damage distance, and a fracturing simulation system, relating to the field of oil and gas field development. The method includes: controlling an injection device to sequentially perform carbon dioxide injection, fracturing fluid injection, and well shut-in operations on a core sample to simulate a carbon dioxide pre-fracturing process; at each stage of the simulation, controlling a monitoring device to acquire fluid migration data of the core sample; determining the location or migration distance of the carbon dioxide migration front within the core sample based on the fluid migration data; acquiring damage response data for multiple core segments within the reservoir section, the damage response data being used to characterize the cumulative damage degree of the core sample caused by the simulation process; determining damage boundary data of the core sample based on the damage response data; and determining damage hysteresis data, used to characterize the spatiotemporal coupling relationship between carbon dioxide migration and core damage, based on the migration front data and the damage boundary data.
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