安塞特低渗叠加砂岩单砂体剩余油分布机理与挖潜  

Distribution mechanism and potential tapping to remaining oil in overlap single sandbody of Ansai reservoir with extra- low permeability

作　　者：刘新菊[1] 高月刚[1] 张洪军[1] 薛利娜[2] 王学生[1] 

机构地区：[1]中国石油长庆油田公司第一采油厂,陕西延安716000 [2]中国石油长庆油田公司长庆科技工程有限公司,陕西西安710018

出　　处：《复杂油气藏》2015年第4期45-48,共4页Complex Hydrocarbon Reservoirs

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05013-005)

摘　　要：安塞特低渗透亿吨级整装油田主力油层C6_1^(1-2)小层,内部由四期河道叠加的单砂体组成,经过30 a的注水开发,剖面动用不均,强水淹厚度不足15%,具有较大的挖潜能力。在大量的野外露头调查和检查井岩心观察与分析测试的基础上,利用加密井网测井资料开展单砂体构型解剖,结合生产动态资料和测试资料,分析小层内单砂体剖面动用状况,建立水驱规律与水淹模型,进行单砂体动用程度评价,有针对性地提出隔采、补孔压裂、重复压裂等措施方案。经过在矿场数百口低产、低效、长关井中实施与跟踪评价,平均单井日净增油量在1.0 t以上,措施效果良好。Major reservoir of Ansai Oilfield with extra - low permeability and in - place volume of hundreds millions ton, named Chang 611-2,is composed of single sandbody from the four phases of river channel overlap. After 30 years of water flooding development,the water injection profile is uneven, and the thickness of water- flooded layer is less than 15%. So there is larger tapping potential. According to the survey of a large number of outcrops and the observation and analytical test of cores taken from inspection wells,the configuration of single sandbody was dissected by using logging data of infilling well pattern. Based on dynamic production data and testing information, producing condition of single sandbody was analyzed, and law of water - flooding and water - flooded model was established, and then the degree of producing condition of single sand- body was evaluated. Finally, the such as separated layer production, reperforating fracturing, refracturing, ect. , were proposed. The application results from hundreds of wells with low - production, low efficient, and long time shut - in showed that average net increased oil of single well was up to 1.0 ton per day and the effect was better.

关 键 词：安塞油田 特低渗透储层 叠加砂岩 单砂体 剩余油 

分 类 号：TE327[石油与天然气工程—油气田开发工程]