【摘要】 水锁损害是低渗透致密气藏的主要损害类型,严重影响了气藏开发效果。在分析水锁损害室内实验方法的基础上,提出了一种室内定性研究含水饱和度对水锁影响的方法--反向作用法,即将岩心置于岩心夹持器中,直接在出口端面施加压力,使相应地层水进入岩心造成水锁损害。该方法简单有效。以川西低渗透致密气藏为例,从岩心自吸作用和正压侵入作用两方面,确定了含水饱和度与水锁损害的关系,即含水饱和度越大,水锁损害越严重,为减轻、消除水锁损害提供了理论指导。更多还原

【Abstract】 As the main damage of low-permeability tight gas reservoirs, water blocking damage seriously influences the results of gas reservoirs development. On the basis of analyzing lab experimental methods of water blocking damage, a simple and effective lab method of qualitatively studying effect of water saturation on water blocking damage is presented. The name is reversed action method. The process is to put cores to core holder and exert pressure on exit end surface so as to result in water blocking damage by the corresponding formation water into the cores. Taking low -permeability tight gas reservoirs in western Sichuan as an example, the relation between water saturation and water blocking damage is determined by natural suction and pressure invasion. The more water saturation, the more serious water blocking damage. It supplies theoretical direction for lightening or eliminating water blocking damage.更多还原