三重介质复合油藏压力动态特征研究  

Study of pressure-transient characteristic for triple-medium composite reservoirs

作　　者：杨坚[1] 姚军[1] 王子胜[1] 

机构地区：[1]中国石油大学,山东东营257061

出　　处：《水动力学研究与进展（A辑）》2005年第4期418-425,共8页Chinese Journal of Hydrodynamics

摘　　要：建立了三重介质复合油藏试井解释模型,采用数值方法对模型进行了求解。讨论了地层的内外渗透率比、内径的大小以、窜流系数、弹性储容比、外边界条件以及表皮系数等参数对于这种类型油藏压力响应动态的影响。表明:当油藏内外区的渗透率不同时,类似于在井的周围存在封闭边界或者定压边界;内区的大小决定着反应外区渗透率影响的压力响应出现的早晚;窜流系数影响着窜流阶段出现的早晚;弹性储容比影响着导数曲线上“凹陷”的深度和宽度;而外边界的影响则由于油藏内外区渗透率的差异而和普通的三重介质油藏不同;表皮系数对压力动态的影响与内外区域渗透率比对压力动态的影响也有着很大的差别。A WellTest interpretation model of triple-media composite-reservoir is established. The mathematical model is solved numerically. The effects of permeability ratio of inner to that of outer zones, radius of inner zone, inter-porosity flow factor, storativity ratio, outer boundary and wellbore skin on pressure transient are discussed. The results show： when the permeability of inner zone is not equal to that of outer zone, the pressure transient is just like the there is a closed fault or a fluid bank around the well. In this case, the radius of inner zone determines the in coming time of pressure transient reflecting the effect of outer permeability, inter-porosity flow factor determines the time of occulance of the inter-porosity flow, storativity ratio decides the width and depth of the “hollow” on the derivative curve, the effect of outer boundary on this kind of composite reservoir is different from that of a normal triple-media reservoir and the effect of wellbore skin on the pressure transient is distinct from the effect of the permeability ratio of inner zone to outer zone.

关 键 词：复合油藏 三重介质 压力动态 

分 类 号：TE312[石油与天然气工程—油气田开发工程]