Ground stress prediction method for linear elasticity-viscidity relaxation stratum

By constructing a ground stress prediction model for linear elastic-viscosity relaxed formations, the problem that the existing technology cannot accurately deal with complex and heterogeneous formations is solved, and more accurate prediction and analysis of ground stress is achieved, supporting the application needs of oil and gas engineering.

CN119692010AActive Publication Date: 2025-03-25SOUTHWEST PETROLEUM UNIV
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Patent Information

Application Number
CN202411753112.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-03-25
Estimated Expiration
2044-12-02

AI Technical Summary

Technical Problem

The existing ground stress calculation model cannot accurately handle the plasticity and inelastic deformation characteristics of complex and heterogeneous formations, resulting in great limitations in ground stress prediction.

Method used

By deducing the generalized Hooke's law to characterize homogeneous isotropic linear elastic medium, and combining with the difference stress model of the viscous relaxed formation, a ground stress prediction model of the linear elastic-viscoscous relaxed formation was constructed, taking into account the heterogeneity and elastic-plastic deformation characteristics of the formation.

Benefits of technology

This model can more accurately predict the stress characteristics of complex formations, provide ground stress prediction of soft and hard interactive formations, accurate characterization of stress differences, and longitudinal, lateral and spatial distribution characteristics analysis of ground stress, and supports engineering applications such as oil and gas exploration and development.

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Abstract

The invention provides a crustal stress prediction method for a linear elasticity-viscosity relaxation stratum. The crustal stress prediction method comprises the following steps: S1, obtaining a generalized Hooke's law representing a homogeneous isotropic elastic stratum; s2, obtaining a ground stress logging calculation model of the homogeneous isotropic linear elastic stratum; s3, obtaining a horizontal stress difference calculation model of the homogeneous isotropic linear elastic stratum; s4, obtaining a horizontal stress difference prediction model of the viscous relaxation stratum; s5, obtaining a basic model of the horizontal principal stress difference of the viscous relaxation stratum; s6, obtaining a horizontal maximum principal stress calculation model and a horizontal minimum principal stress calculation model of the viscous relaxation stratum; s7, obtaining a crustal stress prediction model of the linear elasticity-viscidity relaxation stratum; s8, performing model parameter acquisition method and reasonability verification; s9, realizing crustal stress profile prediction and crustal stress longitudinal distribution characteristic analysis of the linear elasticity-viscidity relaxation stratum; and S10, a three-dimensional crustal stress field prediction result is obtained, crustal stress space distribution feature analysis is realized, and the limitation of an existing crustal stress calculation model is solved.
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