摘要
采用煤岩渗流试验装置,研究了煤层气储层中气体的渗流规律,以及气体滑脱效应、有效应力对煤岩渗透率的影响。从理论上研究了煤岩孔隙系统特征。研究结果表明,由于煤岩特殊的双重孔隙介质特征,有效应力对渗透率影响非常严重。岩石总有效应力增大,煤岩渗透率下降。而卸压时渗透率只能得到一定程度的恢复,从而造成渗透率的损失。
The law of the gas seepage in coalbed reservoirs was studied.The effect of gas slippage and effective stress on coal permeability was investigated by using core flow experimental apparatus.The characteristics of coalbed porosity was theoretically studied.The results show that due to the characteristics of special double-porosity media of coal rocks,the effect of effective stress on permeability is serious.Permeability of coal rocks reduces with the increase of total effective stress.When pressure is released,the permeability can only restored to a certain extent,and result in permeability loss.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2009年第6期127-128,164,共3页
Journal of Oil and Gas Technology
基金
国家科技重大专项项目(2008ZX05036-001)
关键词
煤层气
有效应力
渗透率
滑脱效应
coalbed methane
effective stress
permeability
slippage effect
