低渗气藏水锁伤害研究

Research on Water Locking Damage of Low Permeability Gas Reservoirs

低渗气藏是在我国能源中占有很大的成分,成为我国能源开发的重要领域之一。然而,在开发过程中,低渗气藏存在着严重的储层损害问题,造成气井产能下降。水锁伤害是气井储层伤害的主要方式之一,严重影响的低渗气藏的开发。本文通过室内实验对苏6井区低渗气藏的水锁伤害进行了评价。结果表明,水锁伤害程度与束缚水饱和度呈现出来明显的正相关性,即随着束缚水饱和度的增加,水锁伤害的程度加剧;储层孔隙度与伤害程度呈现出的相关性不强,但可以看出有一定的负相关性;渗透率与水锁伤害程度也呈现出明显的负相关性。

The low permeability gas reservoir is rich in China, and has become an important field of energy development. However, there is a serious formation damage problem in the development process of low permeability gas reservoir, which can result in well productivity to decline. The water locking damage is one of main gas reservoir damages, seriously affecting the development of low permeability gas reservoirs. In this paper, through laboratory experiments, the water locking damage low permeability gas reservoirs in Su 6 well zone was evaluated. The results show that there is a significant positive correlation between the extent of the water locking damage and the irreducible water saturation, with increasing of the irreducible water saturation, the extent of the water locking damage increases; the correlation between the reservoir porosity and the extent of the water locking damage is not strong, but there is certain negative correlation between them; at same time, there is a significant negative correlation between the permeability and the extent of the water locking damage.