| China has rich coal-bed methane resources, exploitation of coalbed methane can not only alleviate the situation of lack of energy in the nest, while the gas disaster prevention and reduction of environmental pollution. However, China CBM "high and low permeability reservoir" feature makes it impossible to form a large-scale industrial mining.Generally believed that the temperature is a key factor in improving the permeability of coal bed methane. Application CBM geology, fluid mechanics and mathematical methods of theoretical physics, for low permeability coal characteristics, according to the three-field coupling mechanism CBM desorption flow variation and dual media, the establishment of coal-bed methane flux under microwave heating-solid-mathematical model coupling seepage, detailed derivation of the full implicit numerical method for solving the mathematical model, and the model and the actual data of the subsequent engineering simulation analysis. Given the development of coalbed methane reservoirs microwave heating mining numerical simulation software ideas.The use of heat transfer, thermodynamics, elasticity, fluid mechanics and rock mechanics to establish a CBM hot microwave heating-solid-fluid coupling diffusion flow mathematical model gives each finite element equations using finite element software of coal Numerical simulation of a single well gas mining microwave heating. The simulation results show that microwave heating mining conditions, methane seepage pressure lower than those without microwave heating mined more pronounced increase in production flow. The simulation results and experimental coincide, thus proving the correctness of the mathematical model and further illustrate the microwave heating exploitation of CBM is reasonable.This study for the study of low permeability coal bed methane extraction microwave heating to provide a reliable theoretical research and technical support, environmental protection, mine safety and production also has practical value. |
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