Coal-Bed Methane Seepage Numerical Simulation Study Considering The Deep Factors

The 66% of coalbed methane resource of our country is deposited under one kilometer, the compression intensity of the coal seam is relatively lower under this depth, the coalbed methane exploitation belongs to deep exploitation. Under this condition, a lot of new influence factors appear, the superficial model of coalbed methane is no longer suitable, so we set up the coalbed methane seepage model considered slip effect and porosity pressure, set up the coalbed methane seepage model considered coupling of slip effect and temperature field, set up the coalbed methane seepage model considered coupling of the slip effect and two phase of water - gas in this paper. Through numerical method, we can analyse the influence of coalbed methane seepage field that considered deep factors such as slip effect, porosity pressure, temperature field and two phase of water - gas. We can get the conclusion that slip effect has favorable influence on aspect of weighting coalbed methane exploitation and output of coalbed methane prediction, temperature field and porosity pressure have unfavorable influence on this aspect. The coalbed methane seepage model considered the coupling of slip effect and two phase of water - gas is truer describes the law of coalbed methane seepage, establishes the foundation for studying the non-linear seepage question of coal-bed methane. In this paper we utilize finite element program to calculate the non-linear seepage model. It has significant academic value to estimate the output of the coal-bed methane and industrial exploitation.