低渗透气藏水锁效应研究

Study on water lock effect in low permeability reservoir

低渗气藏普遍具有低孔、低渗的特点,气、水及少量的油流动的通道较窄,渗流阻力较大,液、固界面及液、气界面的表面张力较大,这样使得水锁效应和应力敏感性明显增强。水锁效应对低渗透储层会产生伤害,严重影响气藏的产能。本文分析了水锁伤害机理,并对各种解除水锁的方法进行了研究对比。

Low permeability reservoirs commonly have low porosity and permeability.The flowing path for gas,water and a little oil is narrow,filtration resistance is big,and the surface tension of liquid-solid interface and liquid-gas interface is large,thus resulting in obvious increase of water lock effect and stress sensitivity.Water lock effect will bring harm to low permeability reservoir and impair reservoir productivity.This paper analyzes the mechanism of water lock damage and correlates various removal methods of water lock.