Rough crack slippage trend calculation method and system considering stress shadow effect

By reconstructing rough cracks using three-dimensional laser scanning and combining it with a bidirectional coupled model of the finite element method and the boundary element method, the deviation problem in the calculation of the stress shadow effect and the slip trend of rough cracks was solved. This enabled efficient and accurate stress field simulation and slip trend assessment, improving the reliability of reservoir stimulation and seismic risk prevention.

CN121787201AActive Publication Date: 2026-04-03CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-09
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Existing technologies suffer from problems such as bias in stress field calculation and inaccurate assessment of slip risk when calculating stress shadowing effect and rough crack slip trend. In particular, it is difficult to achieve efficient and accurate nonlinear iterative calculation and quantitative description of stress shadowing effect in multi-crack systems.

Method used

A non-contact 3D laser scanning method was used to reconstruct a rough crack, constructing a continuous analytical surface on the upper and lower walls of the crack. A thermo-fluid-structure interaction model with bidirectional coupling of the finite element method and the boundary element method was combined. The multi-physics coupling process was solved iteratively through an embedded discrete crack model, quantifying the stress shadowing effect and evaluating the slip trend.

Benefits of technology

It improves the accuracy and engineering applicability of the assessment of the slip trend in multi-fracture systems, provides a more reliable theoretical basis for reservoir stimulation and seismic risk prevention and control, and significantly enhances the reliability of fracture evolution prediction in complex geological environments.

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Abstract

The invention discloses a rough crack slippage trend calculation method and system considering a stress shadow effect. According to the method, rock fracture surface point cloud data is obtained through three-dimensional laser scanning, continuous analysis curved surfaces of the upper wall face and the lower wall face of a crack are reconstructed through preprocessing, morphology characterization and analysis, a crack opening field is obtained through calculation and dispersed into displacement discontinuous units, initial crack width distribution of the rough crack is formed, and crack characteristic parameters are extracted from the initial crack width distribution. And a rough crack shear expansion constitutive model is constructed, the normal closing amount and the shear expansion displacement amount are calculated, and the mechanical opening degree is obtained and converted into the hydraulic opening degree. A finite element and boundary element bidirectional coupling method is adopted, an embedded discrete fracture model is combined, a multi-physics field coupling process is iteratively solved, and the fracture network induced stress considering the stress shadow effect is obtained. And based on the induced stress and the initial far-field crustal stress tensor, calculating to obtain a rough crack slippage trend value considering the stress shadow effect. According to the invention, the precision of slip trend calculation is improved.
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Citation Information

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