中低渗砂岩油藏水驱后期油藏再评价及提高采收率对策  

Re-evaluation of Medium-low Permeability Sandstone Reservoirs in the Later Stage of Water Flooding and Strategies to Improve Recovery Efficiency

作　　者：陈洪才[1] 王昭凯 金忠康[1] 王腾[3] 孙永鹏[2] 赵光[2] Chen Hongcai;Wang Zhaokai;Jin Zhongkang;Wang Teng;Sun Yongpeng;Zhao Guang(Sinopec Jiangsu Oilfield Company,Jinhu,Jiangsu China 211600;China University of Petroleum(East China),Qingdao,Shandong China 266580;PetroChina Changqing Oilfield Company,Xi′an,Shaanxi China 710018)

机构地区：[1]中国石化江苏油田分公司,江苏金湖211600 [2]中国石油大学(华东),山东青岛266580 [3]中国石油长庆油田分公司,陕西西安710018

出　　处：《特种油气藏》2024年第4期133-141,共9页Special Oil & Gas Reservoirs

基　　金：国家级青年人才支持项目“油田化学与提高采收率”(27RA2302015)。

摘　　要：为探究高—特高含水中低渗油藏水驱开发后期提高采收率的有效途径,以南湖油田为例,利用矿物分析与SEM等方法深化储层微观特征再认识,应用核磁共振与压汞结合的方法研究冻胶分散体提高采收率的可行性和应用效果。研究表明:南湖油田大孔道较发育,速敏与水敏特征明显,水窜严重是开发低效的主要原因,低排量注水、保持地层能量、控制水窜是提高开发效果的关键;冻胶分散体能有效抑制水窜,提高中小孔隙剩余油的启动能力,通过冻胶分散体驱替后,样品岩心小孔隙采收率提高52.83个百分点,中孔隙采收率提高34.60个百分点,综合采收率提高33.14个百分点,开发效果显著提升。研究结果可为高含水油藏改善开发效果提供借鉴。In order to explore effective approaches to enhance oil recovery in the late stage of water-flooded development in reservoirs with medium-low permeability and high-ultra-high water content,this study,taking Nanhu Oilfield as an example,deepens the understanding of reservoir microscopic characteristics through mineral analysis and SEM methods,and investigates the feasibility and application effects of dispersed particle gel in improving oil recovery using the combination of nuclear magnetic resonance and mercury injection methods.The results show that Nanhu Oilfield is featured with well-developed large pore channels,obvious speed sensitivity and water sensitivity.Severe water breakthrough is the main reason for inefficient development,while key factors for improving development effectiveness include low-rate water injection,maintaining reservoir energy,and controlling water channeling.The dispersed particle gel can effectively inhibit water breakthrough and improve the mobilization ability of residual oil in medium and small pores.The oil recovery ratio in small pores of the core samples,in medium pores increased by 52.83 percentage points by 34.60 percentage points,respectively,after dispersed particle gel flooding,and the oil recovery increased,and the overall recovery ratio increased by 33.14 percentage points,indicating a significant improvement in development effectiveness.The findings of this study can provide references for improving the development effectiveness of reservoirs with high water content.

关 键 词：中低渗 储层微观特征 水窜通道 技术对策 冻胶分散体 南湖油田 

分 类 号：TE343[石油与天然气工程—油气田开发工程]