苏丹层状边水油藏水平井开发效果评价与对策研究

针对苏丹层状边水油藏部分水平井呈现产量递减快、含水上升快等现象，综合多学科知识对油藏 进行研究，运用无因次日产油水平、无因次累积产油及月含水上升率等指标评价水平井不同含水期的开 发效果，总结含水上升和产量递减的主控因素，提出相应的开发对策。研究结果表明，水平井是苏丹层状 边水油藏高含水期实现控水稳油的重要技术，水平井位置、产液强度及储层的非均质性是影响水平井含 水上升的主要因素，水平井位置及产液强度、地层压力保持水平及储层保护情况是影响水平井产量递减 的主要因素；主要开发对策为早期加强地质优化设计和生产参数优化，中后期采取卡堵水及提液等措施 控水稳油，并适时注水补充能量和加强储层保护，提高单井产能，以改善苏丹层状边水油藏开发效果。

Development effect evaluation and strategy of horizontal wells in multilayer edge water reservoir in Sudan

In order to solve the problems of large increase of water-cut and increasingly decline of horizontal well production in multilayer edge water reservoir in Sudan,the reservoir is studied by integrate multi-discipline knowledge,and the development performance of horizontal well in various water cut stage is evaluated by using dimensionless oil rate and dimensionless cumulative production and monthly incremental ratio of water cut.The results show that horizontal well is the essential technology that can stabilize production and control water cut in high water cut stage of multilayer edge water reservoir,Sudan.The well location,produced fluid intension and reservoir heterogeneity are the major controlling factors for water cut increasing,and the well location,produced fluid intension,reservoir pressure maintenance and formation protection situation are the major controlling factors for production decline.The development strategy is to strengthen horizontal well optimization design in early stage,and lift liquid and water shutoff to stabilize oil production and control water cut,inject water in due time to maintain reservoir pressure and strengthen formation protection in mid-later stage,in order to increase individual productivity and improve the development performance of multilayer edge reservoir.