摘要
中国海上油田在高含水期遇到了很多新问题,生产动态反映出开发效果对采油速度敏感。本文开展了流体流动速度对油水相对渗透率的影响研究,采用非稳态法测试得到了不同流速的非稳态相对渗透率曲线,分析发现:当流速小于1mL/min时,随着驱替速度的增加,水相相对渗透率和油相相对渗透率增加,残余油饱和度降低;当流速大于1mL/min时,随着驱替速度的增加,水相相对渗透率和油相相对渗透率降低,残余油饱和度增加。建立了动态相对渗透率计算模型,将动态相对渗透率计算模型引入到传统方法中,对油水两相数值模拟模型进行了修正,结果表明,水井附近和油井附近考虑动态相对渗透率曲线的数值模拟器计算得到的含水饱和度数值高于传统数值模拟方法计算得到的含水饱和度,注采连线方向上润湿相饱和度曲线会出现漏斗形态。利用中国海上某油田实际数据,验证了本文提出的新方法的准确性。
numerous new problems have been encountered in China offshore oilfields during the high water cut period,and the production performance suggests that the development effect is sensitive to oil production rate.In this paper,the influences of fluid flow velocity on oil-water relative permeability are studied,Firstly,the unsteady relative permeability curves at different flow rates are obtained by using the unsteady test method,and analysis suggests that when the flow rate is less than 1 mL/min,as the displacing velocity increases,the relative permeability of water phase increases,that of oil phase increases and the residual oil saturation decreases;when the flow rate is more than 1 mL/min,as the displacing velocity increases,the relative permeability of water phase decreases,that of oil phase decreases,and the residual oil saturation increases.In this paper,a dynamic relative permeability calculation model is established,which introduces the dynamic relative permeability calculation model into the conventional numerical simulation methods,and makes a modification on the oil-water two-phase numerical simulation model.The results show that for areas in the vicinity of water wells and oil wells,the water saturation value obtain by the numerical simulator considering the dynamic relative permeability curve is higher than the value calculated by the conventional numerical simulation methods,and the wetting phase curve appears as a funnel shape in the direction of injection-production line.The accuracy of the proposed new method is verified by using the actual data of an offshore oilfield in China.
作者
付强
杜志敏
王硕亮
FU Qiang;DU Zhimin;WANG Shuoliang(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan 610500,China;School of Oil&Natural Gas Engineering of Geosciences and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;School of Energy Resources,China University of Geosciences,Beijing 100083,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2020年第1期79-86,共8页
China Offshore Oil and Gas
基金
“十三五”国家科技重大专项“低渗-致密油藏描述新方法与开发模式(编号:2017ZX05009-001)”
国家基本科研业务费优秀教师项目“致密油相态及相对渗透率曲线特征研究(编号:2-9-2018-217)”部分研究成果
关键词
动态相对渗透率曲线
数值模拟
物理模拟
流动速度
dynamic relative permeability curve
numerical simulation
physical simulation
flow velocity
