A TECHNIQUE FOR DYNAMIC POOL-FORMING SIMULATION OF COALBED GAS

Based on the high-temperature and high-pressure core analysis technique, considering the adsorption and desorption characters of coalbed gas and combined with the pool-forming simulation technique of conventional natural gas, a pool-forming simulation instrument of coalbed gas was set up. By this instrument, the major factors affecting coalbed gas preservation, such as the effects of systematic temperature and pressure changes, the diffusion, migretion and dispersion of free gas, the effects of different hydrodynamics and the dissolution of formation water to coalbed gas, were determined. Through quantitative analyses and grade classification, a pool-forming model of coalbed gas was established.