Study Of Coal Seam Gas Reservoir Simulation Numerical Model And Application

In this paper, the mechanisms of the generation, migration and production for coal seam gas are researched and the geological model for coal seam gas reservoir simulation is presented, according to the theories and methods of coal seam gas geology, petroleum geology and dynamic of fluids through porous media. A three-dimensional, dual-porosity, two-phase, pseudo-steady, non-equilibrium sorption mathematical model is established with the help of petroleum reservoir numerical simulation method. After that, this complex mathematical mode is approximated and solved by finite-difference and fully implicit methods. Coal Seam Gas Reservoir Simulation software in 1.0 version (CSGRS 1.0) with Chinese interface of pre- and post-processing function is developed. By comparison with ARI COMET3D software, and also in application to the history matching and production prediction for coal seam gas production wells in Xin Ji Coal Mine, Anhui province, the function, correction, reliability and practicability are validated and verified. On the basis of the above, a demonstration development plan with twenty coal seam gas production wells in Xi Ji Coal Mine area is suggested, and the production prediction for the twenty wells is performed. Finally, the potential of coal seam gas resource in Xin Ji Coal Mine area is evaluated and a constructional proposal for the coal seam gas development of the coal mine area in future is presented.