低渗透气藏层内次生可动水流动临界条件研究  

CRITICAL-FLOWING CONDITION OF INNER-LAYER SECONDARY-MOVABLE WATER IN LOW-PERMEABILITY GAS RESERVOIR

作　　者：邓勇[1] 陆燕妮[2] 李进[3] 任泽坤 

机构地区：[1]中国石化西南油气分公司勘探开发研究院 [2]中国石化西南油气分公司物资供应处 [3]中国石油西南油气田公司勘探开发研究院 [4]中国石油川庆钻探公司地质勘探开发研究院

出　　处：《天然气勘探与开发》2011年第1期36-38,75,共3页Natural Gas Exploration and Development

摘　　要：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。There exists a higher saturation for irreducible water in low-permeability gas reservoir. Generally, the water is adsorbed at the surface of pore throat in membrane form. Based on the mechanism of converting membrane water into inner-layer secondary-movable water, combining with the theory of membrane water, this paper establishes the relatiouship between the membranethickness of irreducible water and formation pressure, Puts forward the critical-flowing condition of secondary-movable water and itscalculation method. Results show that during the middle-and late-development periods of low-permeability reservoir, the seconda-ry-movable water formed by the expanded membrane water can cause damage to water lock, and has certain influenee on the produc-tivity.

关 键 词：低渗透 层内次生可动水 束缚水 水膜 分离压力 临界流动条件 

分 类 号：TE311[石油与天然气工程—油气田开发工程]