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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