摘要
西峰油田长8储层属低渗透弱亲油储层，通过微观模型水驱油实验直观地模拟了水驱油过程中流体的渗流特征及剩余油状况，结果显示弱亲油储层与亲水型储层水驱油过程存在很大的差异。水驱过程主要有水道型、指状驱替型和网状驱替型3种类型，形成油膜残余油和绕流残余油两种剩余油类型。与亲水型储层相比，西峰长8储层岩石水驱油效率却相对较高，其主要影响因素包括非均质性、注水压力、注水倍数、孔隙结构和微裂缝等，通过总结研究区的水驱油机理及影响水驱油效率的因素，为该区及同类型油藏制订合理的注水开发方案提供了一定的依据。
Chang8 reservoirs in the Xifeng Oilfield belong to weak oil-wet reservoirs with low permeability. The fluid percolation characteristics and residual oil situation in the water flooding process were visually simulated by a microscopic model of water flood- ing experiment. The results show that there is a big difference in water flooding processes of weak oil-wet reservoirs and of hy- drophilic reservoirs. The waterflooding process includes mainly three types of waterway, fingering-displacement and mesh-like flood- ing types, forming two remaining oil types of the film-like residual oil and the flow-around residual oil. And compared to hydrophilic reservoir, Chang8 reservoirs in Xifeng have a relatively high efficiency of rock water-displace-oil. The main influencing factors in- clude heterogeneities, water-flooding pressure, water injection multiples, pore structure and micro cracks. It provides the basis for for- mulating reasonable waterflooding development programs of the area and the same type of reservoirs through the summao, of the wa- ter-displace-oil mechanism and the influencing factors.
关键词
微观孔隙结构
剩余油
微裂缝
驱油效率
microscopic pore structure
remaining oil
micro-fracture
oil displacement efficiency
