水锁效应广泛存在于火山岩气藏中,是火山岩气藏的损害类型之一,严重影响着火山岩气藏的开发效果。本文结合核磁共振技术通过室内实验研究,探讨低渗透火山岩气藏自吸作用下的水锁伤害机制及伤害程度,通过气驱反排实验模拟了火山岩气藏水锁解除过程。研究表明:各渗透率级别的火山岩岩心自吸吸入水饱和度与吸水时间并非呈线性关系,自吸开始的2h之内,岩心含水饱和度急剧增加,随着自吸时间的增加,岩心含水饱和度增加幅度越来越小,自吸16h后岩心吸入水量已基本保持不变;应用核磁共振技术研究了吸入水量与孔隙结构的关系,发现孔隙结构越复杂,岩心吸水量越大;通过反排实验发现,岩心含水饱和度以及水锁伤害率随反排孔隙体积(PV)数的增加而减小并趋于平缓,反排25PV后水锁伤害基本得到解除;针对目前水锁伤害评价存在的不足,结合储层中水锁伤害的产生和解除,提出一种改进的水锁伤害评价方法——动态水锁评价方法。 Water lock effect exists widely in volcanic gas reservoirs and is one of the damage types of volcanic gas reservoirs, seriously affecting the development effect of volcanic gas reservoirs. In this paper, through laboratory experiments, this paper discusses the mechanism of water lock damage and the degree of injury under the self-priming action of low permeability volcanic gas reservoirs, and simulates the water lock release process of volcanic gas reservoirs by gas-flooding inversion experiments. The results show that there is no linear relationship between the water saturation and the water absorption time of volcanic cores in each permeability class. The core water saturation increases sharply within 2h since the start of self-absorption, and the water saturation The degree of increase is smaller and smaller, the amount of water inhaled by the core has remained basically unchanged after 16 hours self-priming; the relationship between the amount of inhaled water and the pore structure has been studied by using the nuclear magnetic resonance technique, and the more complicated the pore structure is, It was found that core water saturation and water lock-in rate decreased and tended to be flat with the increase of reversed-row pore volume (PV), and the water-lock injuries were basically relieved after 25PV rearrangement. In view of the current water-lock damage evaluation In combination with the occurrence and release of water lock injuries in reservoir, an improved water lock damage evaluation method - dynamic water lock evaluation method is proposed.