Simulation study of the effect of well spacing, effect of permeability anisotropy, and effect of Palmer and Mansoori model on coalbed methane production

摘要

Interference for adjacent wells may be beneficial to Coalbed-Methane production. Theeffect is the acceleration of de-watering which should lead to earlier and higher gas ratepeaks. It is inherent that permeability anisotropy exists in the coalbed methane formation.It means that the placement of wells (wells configuration) has an effect on thedevelopment of coalbed methane field.The effect of Palmer-Mansoori Theory is increasing effective permeability atlower pressures due to matrix shrinkage during desorption. This effect should increasethe gas recovery of coalbed methane production. Palmer and Mansoori model should beconsidered and included to coalbed methane reservoir simulation.These effects and phenomena can be modeled with the CMG simulator. Asystematic sensitivity study of various reservoir and operating parameters will result ingeneralized guidelines for operating these reservoirs more effectively.