Numerical simulation of gas injection induced hydro-Mechanical coupling and damage in COx claystone

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-02-16 DOI:10.1016/j.gete.2025.100643

Zhan Yu , Jian-Fu Shao , Gilles Duveau , Minh-Ngoc Vu , Carlos Plua

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Abstract

This study, part of international research project DECOVALEX-2023, investigates the impact of gas injection on COx claystone proposed by the French National Radioactive Waste Management Agency. A biphase flow model, accounting for both liquid and gas phases in porous materials, is developed to analyze the hydro-mechanical coupling behavior induced by high gas pressure. A phase field model is incorporated to describe the coupled cracking behavior. The model is validated using a one-dimensional benchmark, confirming the reliability of the numerical simulation. Subsequently, a series of two-dimensional benchmarks are utilized to study the effects of initial stress isotropy, material anisotropy, and damage zones on the gas injection process. Key findings include the identification of symmetric distributions in isotropic conditions, altered pressure distributions in anisotropic initial stress conditions, and the effect of transversely isotropic material properties on the shape and propagation of high-pressure zones and damage areas. The phase field model successfully captures the transition from diffuse damage to localized cracks.

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.