特低渗透油藏渗流机理研究及应用  

Research and application of percolation mechanism in extra-low permeability oil reservoir

作　　者：束青林[1] 郭迎春[2] 孙志刚[2] 丛国林[1] 徐永[1] Shu Qinglin;Guo Yingchun;Sun Zhigang;Cong Guolin;Xu Yong(Oil & Gas Development Management Center,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257000,China;Research Institute of Exploration and Development,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油气开发管理中心,山东东营257000 [2]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》2016年第5期58-64,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"胜利油田薄互层低渗透油田开发示范工程"(2011ZX05051)

摘　　要：胜利油区特低渗透油藏物性差、非均质性强、储量丰度低、孔喉细小,开发中存在单井液量低、有效驱替难、技术经济井距难以确定等问题,为此,从微观和宏观上研究了特低渗透油藏开发效果的影响因素,深化了特低渗透油藏非达西渗流机理,建立了有效渗流能力评价方法,发展完善了提高薄互层储层预测精度的新方法和相控地应力预测技术,形成了以储层改造完井适配井网技术为核心的提高采收率技术。恒速压汞和微管实验研究发现,喉道的大小和分布是影响特低渗透油藏有效渗透能力的主控因素;特低渗透油藏存在边界层,从而减小了有效流动半径,增大了渗流阻力。通过攻关集成配套技术和应用,整体开发水平得以提高,相控非均质地应力预测技术得到的地应力与井点测量结果误差在5°之内,仿水平井注水开发技术建成产能为144.3×104t,径向水射流井网适配技术使纯17-1块采收率提高了7.0%,复合增注技术使滨425块沙四段油藏单元平均单井增产液量为3.3 t/d,实现了特低渗透储量的高效开发。The extra-low permeability oil reservoirs in Shengli oilfield have poor physical property,high heterogeneity,lowreserves abundance and small pore throat. During the development,there are problems of low fluid production in singlewell,difficult effective displacement,contradictory between technical and economic well spacing,etc. In view of the aboveproblems,factors that affect the development of extra-low permeability oil reservoirs were studied from the micro and themacro levels. Non-Darcy percolation mechanism of the extra-low permeability oil reservoirs was deepened,and evaluationmethod for effective seepage ability was established. A new method of improving the prediction accuracy of thin interbed?ded reservoirs and phase controlled stress field prediction technology were developed and improved. EOR technology thattaking reservoir reconstruction and well pattern adaption as the core was formed. The study of rate-controlled mercury in?jection and microtubule experiment shows that size and distribution of the throat are the main influencing factors of effec?tive percolation ability in the extra-low permeability oil reservoir;boundary layer exist in the extra-low permeability oil res?ervoir,which reduces effective flow radius and increases flow resistance. Through the research and application of integratedsupporting technologies,the overall level of development was improved,and error between the stress obtained by phasecontrolledheterogeneous stress prediction technique and well point measurement was within 5°. Productivity gained by wa?terflooding technique in the pseudo-horizontal wells was 144.3×104 t. Well pattern adaptation technology of radial water jet made the recovery efficiency increase by 7.0% in Chun17-1 block. Compound stimulation technology made the average flu?id production in single well increase by 3.3 t/d in the units of Es4 oil reservoirs in Bin425 block. So the efficient productionand low-cost development of the extra-low permeability reserves were realized.

关 键 词：特低渗透 孔喉特征 渗流机理 地应力预测 适配井网开发 复合增注 

分 类 号：TE348[石油与天然气工程—油气田开发工程]