低渗油藏油水相对渗透率非稳态计算方法  

RESEARCHES ON THE UNSTEADY-STATE CALCULATION METHOD OF OIL AND WATER RELATIVE PERMEABILITIES IN LOW-PERMEABILITY OIL RESERVOIRS

作　　者：周英芳[1] 王晓冬[1] 李斌会[2] 杨清彦[2] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2010年第3期93-97,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项项目专题“复杂油气田地质与提高采收率技术”部分内容（编号：2008ZX05009-004-003）.

摘　　要：低渗透油藏有效开发是我国今后提高原油产量的重要潜力措施之一。相对渗透率曲线作为油藏数值模拟、油藏开发方案设计中的重要基础数据，在引入动态变化的油水两相启动压力梯度（SPG）后，分析了水驱低渗透岩心的分流量方程特征，在此基础之上推导了低渗透岩心水驱油相对渗透率的算法。结果表明水相的相对渗透率包含了油水两相启动压力梯度的影响，油相的相对渗透率算法的形式和传统的JBN方法的形式一致，然而形式一样却不表示计算结果也一样。算例表明新算法得到的低渗透岩心水驱油相对渗透率要比传统JBN方法的值要大。From now on, the effective development of low-permeability oil reservoirs is becoming one of important potential-tapping methods to improve oil production, and among this process, the relative permeability curves have regarded as significant foundational data for numerical reservoir simulation and the design of reservoir development program. With the help of the introduced dynamic two-phase （ oil and water） starting pressure gradients （ SPG）, the features of fractional flow equation of water driven low-permeability cores are analyzed and furthermore on the basis of the above the algorithm of the water displaced relative permeability of low-permeability oil cores is derived. All the research results show that the calculated relative permeabilities reflect the influences of oil ＆ water two- phase starting pressure gradients （ SPG ） , while the same calculation form of both oil-phase relative permeability and traditional JBN method doesnt mean the same calculated results. The case shows that the relative permeability values of water-displaced low-permeability cores obtained by the new algorithm are bigger than that by traditional JBN method.

关 键 词：低渗透 相对渗透率 非稳态 变启动压力梯度 算法 

分 类 号：TE312[石油与天然气工程—油气田开发工程]