Thermal-Fluid-Solid Multi-Field Coupling Simulation Method Based on Micro-Scale Reconstruction Model

Abstract

The present application discloses a Thermal-Fluid-Solid Multi-Field Coupling Simulation Method Based on a Micro-Scale Reconstruction Model. The method comprises the steps that: based on the reconstructed pore-scale structured mesh model of rock, by using rock micro-CT images, the mathematical model of solid-solid-three-field coupling is established, and the prediction of rock pore structure evolution and flow characteristics by stress and temperature change is realized through numerical simulation. Different from the traditional macro-scale heat-solid-solid coupling theory, this method is based on the reconstruction model of pore scale, and reveals the interaction mechanism of solid multi-field coupling. It is not only helpful to predict the effect of stress and temperature parameters on the development effect, but also to promote the research of multi-field coupling in geotechnical engineering, such as underground nuclear waste disposal, CO2 sequestration and geothermal development, which can better guide the engineering practice.

Description

technical field [0001] The invention relates to the technical field of rock physics, in particular to a rock heat-fluid-solid multi-field coupling simulation method using micro-CT images combined with micro-scale model reconstruction technology. Background technique [0002] Studies have shown that rocks in nature are a kind of strongly heterogeneous porous media, in which there are often fluid-solid coupling systems in which gas phase, liquid phase and solid phase interact. The fluid-solid coupling system plays an important role in controlling the macroscopic physical and mechanical properties of rocks and the transport characteristics of fluids. At the same time, such fluid-solid coupling systems are often controlled by temperature changes in nature. A large number of engineering practices have shown that in the construction of rock-related engineering fields such as oil and gas development, geothermal energy utilization, CO2 geological storage, hydropower and tunnels, the...

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Problems solved by technology

However, at this stage, the research on the thermal-fluid-solid coupling theory of rocks is often based on the macroscopic continuum idea, and the rock skeleton and pore fluid are regarded as a continuum to characterize the porous medium, which is limited to the macroscopic scale, thus ignoring the large amount of fluid in the rock. The influence of complex and disordered pore structure on rock mechanical properties, fluid transport characteristics and thermodynamic properties

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