渤海油田油水相对渗透率和水驱油效率研究  

The Study on Oil-water Relative Permeability and Displacement Efficiency in Bohai Oilfield

作　　者：李功 杨小婕 耿娜 杨东东 刘杰 

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《长江大学学报（自科版）（中旬）》2015年第5期61-65,7,共5页Journal of Yangtze University(Nature Science Edition)

基　　金：国家科技重大专项(2011ZX05057-001)

摘　　要：驱油效率是注水开发油田的一个重要指标,是水驱油田的极限采收率,因此要评价油田水驱采收率的潜力,首先应分析驱油效率的理论值。以渤海油田283条天然岩心测量的非稳态油水相对渗透率曲线为样本,统计得到了束缚水饱和度、残余油下水饱和度、束缚水下油相相对渗透率、残余油下水相相对渗透率、残余油下归一化水相相对渗透率与有效渗透率间的统计规律,由此得到渤海油田驱油效率与岩石有效渗透率的统计规律。同时,利用相对渗透率曲线、分流量方程和Welge方程从理论上推导了水驱油效率计算公式,在此基础上研究了驱油效率的影响因素以及水驱油实验的取值条件。Oil displacement efficiency,which was the ultimate recovery factor of water-drive oilfields,was an important index of water flooding oilfields.If it was needed to evaluate oil recovery potential in the oilfields,the theoretical value of displacement efficiency should be analyzed first.By taking the data of unsteady oil-water relative permeability of 283 curves measured from natural cores as samples,natural cores,the statistical rules of water saturation of irreducible water saturation and residual oil and water,oil relative permeability of irreducible water saturation,water relative permeability of residual oil and normalized displacement efficiency with the effective permeability of residual oil were obtained,by which the statistical rules between oil displacement efficiency and effective rock permeability of Bohai Oilfield were obtained.At the same time,according to the relative permeability cures,fractional flow equation and Welge Equation,the condition of the influential factors of displacement efficiency and the value of displacement experiment are studied.

关 键 词：驱油效率 注水开发 水驱采收率 相对渗透率 有效渗透率 Welge方程 

分 类 号：TE349[石油与天然气工程—油气田开发工程]