摘要
选取鄯善油田天然岩心进行油水启动压力梯度测定和水驱油实验,绘制了油水单相渗流曲线、油水启动压力梯度与空气渗透率的关系曲线和油水相对渗透率曲线。将油水相对渗透率曲线和标准相对渗透率曲线进行了比较,得出了低渗透储层油水两相渗流的特征。应用油水相对渗透率曲线,结合油藏工程方法和生产实际,分析得到了低渗透油田注水开发的基本生产特征。结果表明:岩心的启动压力梯度与流体的物理性质有关,岩心的渗透率越小,启动压力梯度就越大;鄯善油田进入中高含水期排液可能会比较困难。
Natural cores taken from Shanshan Oilfield are used to measure threshold pressure gradient of oil - water two phases and conduct water flooding experiments. Some experimental curves,including draw oil - water single - phase seepage curve, the relation curve between the threshold pressure gradient of the oil - water two phases and air permeability, and oil - water relative permeability curve, were drawn by using the above test resutlts. The oil - water two phase flow charac- teristics of low permeability reservoir are gained by comparing oil - water relative permeability curve with standard relative permeability curve. And the basic production characteristics of water flooding in low permeability oilfield are obtained by u- sing oil -water relative permeability curve, and combining with reservoir engineering methods and production practice. Results are shown as follows ： （ 1 ） the start - up pressure gradient of cores may be related to fluid properties ; （ 2 ） the smaller the permeability of core is, the bigger the start - up pressure gradient is ; （3） when Shanshan oilfield enters into mid - high water - cut stage, it is very difficult for fluid drainage.
出处
《复杂油气藏》
2011年第3期57-61,共5页
Complex Hydrocarbon Reservoirs
关键词
低渗透油田
启动压力梯度
相对渗透率
采液指数
low permeability oilfield
start - up pressure gradient
relative permeability
liquid production index
