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Reservoir dynamic permeability of high rank coalbed methane and its effect on the coalbed methane output
Author(s): 
Pages: 966-969,974
Year: Issue:  6
Journal: Acta Petrolei Sinica

Abstract: 通过开展干样煤储层地质效应实验,结合数值模拟方法,研究了煤储层渗透率动态变化特征及其对煤层气井产能的影响.实验结果证明,煤储层渗透性在开发过程中呈不对称"U"型变化,初期以应力敏感性为主,随着开发进程深入,基质收缩效应逐步增强.当压力从2MPa增加到10MPa时,气相渗透率降低90%;应力降低后,渗透率不能恢复到原始水平.P&M渗透率模型模拟结果说明,渗透率初期减小,后期增大;压力降至临界解吸压力...
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