摘要
根据相似理论设计了满足几何相似、运动相似、动力相似和缝洞特征参数相似的缝洞组合体物理模型和模拟实验,研究了缝洞组合体内流体流动特征、水驱油特征的影响因素以及不同驱替方式的提高采收率特征。模拟实验结果表明:油水密度差异导致的油水置换效应是水驱油主要机理;注水速度对剩余油分布和含水率变化规律无影响;缝洞连接关系是决定无水采收率、极限剩余油和含水率变化规律的主要因素;油水黏度比是影响产油速度、换油率和经济极限剩余油的重要因素;充填疏松时充填作用对剩余油几乎没有影响,充填致密时剩余油包括"阁楼油"和充填孔隙中剩余油两部分;水驱转泡沫驱主要通过启动溶洞顶部"阁楼油"提高采收率,泡沫驱后剩余油位于溶洞中部;水驱转聚合物驱主要通过增加注入水的换油率和采油速度提高经济极限采收率,对水驱极限剩余油无影响。
Based on the theory of scaling criteria, a physical experimental model of fractured-vuggy cell which meets the geometric similarity, kinematic similarity, dynamic similarity and characteristic parameters similarity was designed. The factors affecting fluid flow and water flooding characteristics, and the EOR features of different displacing modes were studied by experiments. The experimental results show that： Oil and water displacement effect caused by the density difference between oil and water is the main mechanism of water flooding; Injection rate has no effect on the remaining oil and water-cut; Fracture-vuggy connection is the dominant factor controlling water-free recovery, ultimate limit of remaining oil and water-cut variation in the fractured-vuggy cell; Oil-water viscosity ratio has an important effect on oil production rate, oil replacement ratio and economic limit remaining oil; When the filling degree is low, it has no effect on remaining oil, but when the filling degree is high, the remaining oil contains both ＂attic oil＂ and the oil existing in porous media; Foam flooding after water flooding enhances oil recovery by starting the attic oil at the top of vugs, and the remaining oil is in the center of the vugs after foam flooding; Polymer flooding after water flooding enhances the economic limit recovery by increasing the oil production rate and oil draining ratio, but it has no effect on the limit remaining oil of water flooding.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2014年第1期67-73,共7页
Petroleum Exploration and Development
基金
国家重点基础研究发展计划(973)项目(2011CB201006)
国家科技重大专项(2011ZX05014-003-008HZ)
关键词
缝洞型油藏
水驱实验
缝洞组合体
相似理论
缝洞连接关系
剩余油
提高采收率
fractured-vuggy reservoir
water flooding experiment
fractured-vuggy cell
scaling theory
fractured-vuggy configuring relation
remaining oil
enhanced oil recovery
