Heat-fluid-solid coupling numerical simulation method for high-temperature fracture-cavity type reservoir

Abstract

The invention discloses a heat-fluid-solid coupling numerical simulation method a high-temperature fracture-cavity type reservoir. The method comprises the following steps: acquiring geometric information of fractures and karst caves of the high-temperature fracture-cavity type reservoir, and generating a discrete fracture-cavity model meeting fractal and power law distribution; and establishing aheat-fluid-solid coupling mathematical model and a numerical calculation method of the high-temperature fracture-cavity type reservoir, and performing heat-fluid-solid coupling numerical simulation on the discrete fracture-cavity model meeting fractal power law distribution. According to the method provided by the invention, the energy mass transmission rule of the high-temperature fracture-cavity type reservoir under the heat-fluid-solid coupling effect of comprehensively considering the geometric attributes of the discrete fracture-cavity network and seepage free flow coupling, the local non-thermal equilibrium effect, fracture nonlinear shear-expansion deformation and the like can be well simulated. The method is suitable for practical application, the development dynamic of the high-temperature fracture-cavity type reservoir is predicted, and main factors influencing the development dynamic of the high-temperature fracture-cavity type reservoir are determined.

Description

technical field [0001] The invention relates to the field of numerical simulation of geothermal fields, in particular to a numerical simulation method for heat-fluid-solid coupling of high-temperature fracture-cavity reservoirs. Background technique [0002] For the potential energy crisis and environmental problems, the use of huge resources, sustainable, environmentally friendly renewable energy geothermal resources will be a solution to replace fossil energy. The high-temperature fractured-vuggy carbonate reservoir is composed of bedrock system, fracture system and cave system, which is a kind of geothermal resources. Due to the tectonic movement and the dissolution of paleokarst, well-developed fractures (distributed in a disconnected or connected form) and caves (isolated or connected with fractures, ranging in diameter from centimeters to meters), have obvious multi-scale. [0003] The heat transfer process of fracture-cavity reservoirs is mainly controlled by fluid f...

AI Technical Summary

Problems solved by technology

The fracture conductivity depends on the fracture opening, so the heat-fluid-solid coupling process will seriously affect the energy and mass transport of fractured porous media.

Images