缝洞型碳酸盐岩油藏周期注水驱油机理  

Mechanism of cyclic water flooding in fractured-vuggy type carbonate reservoir

作　　者：张晓[1] 李小波[1] 荣元帅[1] 杨敏[1] 吴锋[2] 刘冬青[1] 

机构地区：[1]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011 [2]西南石油大学"油气藏与地质国家重点实验室",四川成都610500

出　　处：《复杂油气藏》2017年第2期38-42,共5页Complex Hydrocarbon Reservoirs

基　　金：国家科技重大专项(2016ZX05053)项目"塔里木盆地碳酸盐岩油气田提高采收率关键技术示范工程"项目资助

摘　　要：针对在缝洞型碳酸盐岩油藏中能否实施周期注水的问题,在分析缝洞型油藏不同岩溶背景注采关系特征的基础上,利用CFD流体力学软件建立缝洞组合机理模型,开展了周期注水驱油模拟,并运用类比法总结了缝洞型油藏周期注水驱油机理:通过周期性地改变注水量和注入压力引起大尺度缝洞连通体中流体流动状态的变化(段塞流、管流),在重力及浮力以及流动压差综合作用下,使管道盲端、微裂缝、相连溶洞、孔洞中的剩余油得到动用,实现扩大注水波及体积的目的。缝洞型油藏周期注水驱油机理的初步明确,为矿场不同岩溶背景下注水方式的优选和注采参数的确定提供了理论依据。Whether cyclic water flooding can be implemented in fractured - vuggy carbonate reservoir,it is still uncer- tain. Aiming at the problem, by analyzing the relationship between injection and production in fractured - vuggy reservoir under different karst background, a mechanism model of fractured - vuggy combination was built by a set of CFD fluid me- chanic software. And then the cyclic waterflooding was stimulated on the model. The mechanism of cyclic water flooding was summarized by the analogy method. The fluid flow regime, slug flow and pipe flow, in the connected body of large - scale fractured -vuggy was converted by periodically changing the water injection rate and the injection pressure. Remai- ning oil in dead - end, micro - fracture, and connected rug was produced under the comprehensive effect of gravity, buoy- ancy, and differential pressure of flow. As a result, the water swept volume was increased. The mechanism can provide theo- retical basis for selecting water flooding pattern and determining parameters of injection and production under different karst background.

关 键 词：塔河油田 缝洞型油藏 注水驱油 机理 周期注水 

分 类 号：TE341[石油与天然气工程—油气田开发工程]