Hot dry rock heat production prediction method based on heat-fluid-solid-damage coupling

Abstract

The invention discloses a hot dry rock heat production prediction method based on heat-fluid-solid-damage coupling, and the method comprises the steps: building a hot dry rock enhanced geothermal system heat-fluid-solid coupling model, carrying out the grid adaptive division of the hot dry rock enhanced geothermal system model, carrying out the heat-fluid-solid multi-physics field coupling calculation, and carrying out the heat-fluid-solid multi-physics field coupling calculation. Obtaining heat, flow and solid physical field solutions; performing damage analysis on the hot dry rock reservoir area according to the stress solution to obtain a local damage area of the hot dry rock reservoir; and obtaining the heat energy of the hot dry rock based on the heat-fluid-solid coupling solution. According to the method, the engineering scale hot dry rock reservoir model considering heat-fluid-solid multi-physics field coupling is established, the hot dry rock exploitation heat diffusion process is simulated, reservoir damage analysis and model grid optimization are achieved, and therefore the heat energy exploited by the hot dry rock can be reliably evaluated.

Description

technical field [0001] The invention belongs to the field of enhanced geothermal system (EGS) dry-hot rock artificial thermal storage construction, in particular to a dry-hot rock heat production prediction method based on heat-fluid-solid-damage coupling. Background technique [0002] With the increasingly severe environmental problems and the gradual reduction of energy, the development and utilization of new clean energy has become an inevitable requirement for sustainable development of mankind. Geothermal energy is a kind of renewable energy with large reserves, wide distribution, safe development and utilization, stable, clean and efficient. Hot dry rock-type geothermal energy is widely distributed due to its wide global distribution and almost zero emissions after utilization. application. Enhanced geothermal system is a technology for mining thermal energy proposed on the basis of hot dry rock technology. It uses hydraulic fracturing to transform the original natura...

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Problems solved by technology

[0005]However, most of the above models focus on pure heat extraction calculations, without considering the coupling of heat-fluid-solid multiphysics fields, and without using the conceptual model of the actual flow state , reservoir damage and other important factors to carry out numerical simulation of hot dry rock and thermal diffusion on an engineering scale, which reduces the productivity prediction effect

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