低渗天然气气层损害机理探究

结合低渗气藏的地质特征 ,并通过气层潜在性损害因素的分析对比 ,深入调查研究了低渗气藏在气层打开后产生损害的特点和损害机理 ,并对损害程度定量化进行了探讨 .研究结果表明 :低渗气藏除具有油层相类似的损害特征外 ,液相滞留、压力敏感性和含水饱和度程度是气层损害的突出特点 .这些损害特征的综合作用 ,使得气层损害问题较油层损害在预防和治理方面更为复杂

Study on the Formation Damage in Low-permeability Gas Reservoirs

Low permeability gas reservoirs generally have the characteristics of the small clearance for flowing of liquid or gas, great seepage resistance, strong interfacial interaction of solid liquid or gas liquid, high content of irreducible water, great capillary force, and great specific surface etc. Therefore, the damage of low permeability gas reservoirs has its particularity. The features, mechanism and quantitative degree of the gas reservoir damage are studied by consulting a lot of literatures and analyzing the geological characteristics of the low permeability gas reservoirs. It is shown that besides the same damage factors as in oil reservoirs, there are ones such as liquid phase retention, sensitivity of pressure and sensitivity of water etc. in the low permeability gas reservoirs. The characteristics of these damages will make the prevention and removal of them more complex than those of the damages in oil reservoirs.