基于密闭取心井的非均相复合驱后剩余油分布特征与变化规律——以孤岛油田中一区Ng3为例  

Distribution characteristics of remaining oil after heterogeneous combination flooding based on sealed cored well:A case study in Zhongyi area Ng3,Gudao Oilfield

作　　者：郭长春 GUO Changchun(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《油气地质与采收率》2022年第5期111-117,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“特高含水后期整装油田延长经济寿命期开发技术”(2016ZX05011-001)。

摘　　要：自2010年胜利油田在孤岛油田中一区Ng3开展非均相复合驱先导试验以来,非均相复合驱技术的应用规模不断扩大,已成为老油田进一步提高采收率的化学驱主导技术之一。尽管非均相复合驱在孤岛油田中一区Ng3取得了成功,但非均相复合驱后剩余油分布特征、非均相复合驱油藏动用规律成为其推广实施中亟待解决的关键问题。为此,基于密闭取心井资料,系统分析非均相复合驱后剩余油分布特征,并与非均相复合驱前的对比,总结非均相复合驱油藏动用规律。研究结果表明:非均相复合驱后的孤岛油田中一区Ng3平均剩余油饱和度为28.3%,高剩余油饱和度样品多发育在正韵律储层顶部及夹层附近;剩余油微观赋存形态以浸染状为主。与非均相复合驱前相比,非均相复合驱后平均剩余油饱和度降低7%,平均驱油效率提高13.1%,非均相复合驱垂向动用更均衡,正韵律储层顶部与底部剩余油饱和度差异减小。The application scale of heterogeneous combination flooding has been expanding significantly since the pilot test carried out at Ng3 of Zhongyi area,Gudao Oilfield,Shengli Petroleum Province in 2010.It has become one of the leading chemical flooding technologies for further enhancing oil recovery in old oilfields.Although the application of heterogeneous combination flooding technology has achieved successful results at Ng3 of Zhongyi area,the remaining oil distribution and reservoir response law after heterogeneous combination flooding are still the key problems to be addressed in the promotion and implementation of the technology.This paper systematically analyzes the distribution characteristics of remaining oil af⁃ter heterogeneous combination flooding based on sealed cored well and summarizes the reservoir response law by compar⁃ing the remaining oil distribution before and after heterogeneous combination flooding.The results show that the average re⁃maining oil saturation at Ng3 of Zhongyi area is 28.3%after heterogeneous combination flooding.The samples with high re⁃maining oil saturation mostly appear at the top of the positive rhythm reservoir and near the interlayer.The microscopic oc⁃currence mode of remaining oil is mainly disseminated.Compared with that before heterogeneous combination flooding,the average remaining oil saturation is reduced by 7%,and the average displacement efficiency is increased by 13.1%.More⁃over,the displacement is more balanced in the vertical direction,and the difference in remaining oil saturation between the top and bottom of the positive rhythm reservoir is reduced after heterogeneous combination flooding.

关 键 词：非均相复合驱 剩余油 孔喉结构 正韵律储层 孤岛油田 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]