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低渗透气藏层内次生可动水流动临界条件研究

Natural Gas Exploration and Development(2011)

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Abstract
低渗透气藏具有较高的束缚水饱和度,主要以水膜水形式吸附在孔喉表面。在对水膜水转换为层内次生可动水的机理分析基础上,结合水膜理论,建立储层中束缚水水膜厚度与地层压力的变化关系,提出层内次生可动水流动的临界条件及其计算方法,实例计算分析认为:低渗透油气藏开发中后期,水膜水膨胀而形成的层内次生可动水会造成储层的水锁损害,对气井产量有一定的影响。
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Key words
critical-flowing condition,separation pres-sure,water membrane,inner-layer secondary-movable water,low permeability,irreducible water
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