低渗透气藏渗流研究现状

Present state of low permeability reservoir percolation study

低渗气藏的开发已成为我国气藏开发所面临的一个技术挑战。由于低渗气藏一般具有低孔低渗的特点,所以其渗流机理与普通气藏相差很大。影响低渗气藏渗流特征的主要因素有应力作用、启动压力梯度、滑脱效应和水锁效应等因素,并且这些因素对渗流影响各有不同,但最终均引起低渗气藏渗流的非线性化。认识到这些因素对低渗气藏渗流的影响,对此类型气藏开发具有十分重要的意义。

Low permeability reservoir development is a technical challenge in China.The percolation mechanism of low permeability reservoirs differs a lot from that of conventional gas reservoirs.The main factors affecting percolation in low permeability reservoirs include stress,threshold pressure gradient,slippage effect and water-blocking effect,which play various roles on percolation,but all will result in non-linear percolation in the end.Understanding of these influence factors on percolation is of significant importance to development of such reservoirs.