低渗透气藏水相蒸发对气体渗流的影响  

The influence of water phase evaporation on gas percolation in low permeability gas reservoirs

作　　者：尚希涛[1] 何顺利[1] 李秀生[1] 刘辉[1] 胡景宏[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室

出　　处：《天然气工业》2009年第6期80-82,共3页Natural Gas Industry

基　　金："十一五"国家科技攻关项目"复杂天然气田渗流与高效开发技术研究"(编号:2006BAB03B03)的资助

摘　　要：低渗透气藏近井区地层水蒸发对气体渗流会产生一定的影响。为此,研究了水相蒸发现象产生的机理和变化规律,分析了利用水相蒸发解除气井水锁效应的可行性。结果表明:气井生产压差和气井产量是影响近井区水相蒸发的两个主要因素,产量越高,生产压差越大,水相蒸发的影响半径越大;水相蒸发主要发生在距井筒5m的范围内;在低渗透气藏气井生产初期可以适当降低井底压力,放大生产压差,提高水相蒸发速率以快速解除水锁效应,降低气体渗流阻力。Water evaporation has a certain influence on gas percolation in formation in low permeability gas reservoirs near wellbore. Therefore,this paper studies the producing mechanism of water phase evaporation phenomenon and its change law and analyzes the feasibility to remove water lock effect of a gas well by using of water phase evaporation. It is shown by result that a gas well's producing pressure drop and its production are main factors to influence water phase evaporation near wellbore,i.e.,the bigger the production is,the higher the producing pressure drop is and the larger the radius influenced by water phase evaporation is. Water phase evaporation mainly occurs in the range of 5 m apart from wellbore; it is appropriate to decrease bottom hole pressure,increase producing pressure drop and raise the rate of water phase evaporation in order to rapidly eliminate water lock effect and decrease the gas percolating resistance in early development stage of a gas well in low permeability gas reservoir.

关 键 词：低渗透油气藏 地层水 蒸发 含水饱和度 渗流 

分 类 号：TE311[石油与天然气工程—油气田开发工程]