摘要
低渗透气藏开发过程中广泛存在着水锁效应,确定水锁损害程度对气藏开发具有重要意义,准确预测近井地带含水饱和度的分布是确定水锁损害程度的关键技术之一。对水的蒸发作用机理和影响因素进行了分析,给出了稳定流条件下预测近井地带含水饱和度分布的数学模型,利用该模型分析了气井产量、地层水矿化度和地层温度对近井地带含水饱和度分布的影响。研究认为,气井产量和地层温度对近井地带含水饱和度分布的影响较大,而地层水矿化度的影响较小;在高温高压气藏中液相侵入较浅时可以利用蒸发作用解除气井水锁。研究结果对准确评价气藏中水锁效应的影响有一定指导意义。
Water locking took place in the development of low permeability gas reservoirs,it was of critical importance to determine the degree of water lock in gas reservoir development.To accurately predict the saturation distribution in near wellbore was one of the key techniques for determining degree of water locking effect.The water evaporation mechanism and its influencing factors were analyzed,mathematical model was provided to calculate the distribution of water saturation on stable flow conditions.The model was used to analyze the effects of flow rate of gas wells,the salinity of formation water and formation temperature on water saturation distribution in near wellbore area.Result shows that the influence of gas well production and formation temperature on its distribution is larger,and the influence of salinity is less.Evaporation can remove water locking effect in gas reservoirs with high temperature and high pressure when liquid invasion is shallow(less than 5m).The study provides guidance for accurately evaluating water lock effect in gas reservoirs.
出处
《石油天然气学报》
CAS
CSCD
2012年第10期141-143,147,共4页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2011ZX05015
2011ZX05022-004)
关键词
低渗透气藏
蒸发作用
饱和度分布
水锁
low permeability gas reservoir
evaporation
saturation distribution
water lock
