萨北BEXD区块二类油层弱碱三元复合驱开发方案后评价

Post evaluation of weak alkali ASP flooding development plan for type Ⅱ reservoir in BEXD block of Sabei development area

BEXD区块二类油层是大庆油田萨北开发区第一个弱碱三元复合驱工业化推广区块,通过优化层系组合,实施注聚前深度调剖,建立全过程跟踪调整模式,制定相应的调整措施,使开采过程中油层动用程度明显提高,保持了较好的压力系统和注采能力,阶段提高采收率16.43%,预测最终提高采收率可达19.50%,具有较好的开发效果。通过对BEXD区块二类油层弱碱三元复合驱开发方案开展后评价,认为弱碱三元复合驱技术在萨北二类油层的工业化应用,能够大幅度提高采收率,为萨北开发区的原油稳产和可持续发展提供坚实的技术支撑。

Type II reservoir in BEXD block is the first weak alkali ASP flooding industrial promotion block in Sabei development area of Daqing oilfield.By optimizing the combination of strata,implementing the depth profile control before polymer injection,the whole process tracking adjustment mode was established and the corresponding adjustment measures were made.Therefore,the production degree of the oil layer in the production process has been greatly improved,and then a good pressure system and injection production capacity has been maintained.The recovery factor can be increased by 16.43%,the predicted ultimate EOR is 19.5%and a good development effect has been achieved.Through the post evaluation of the development plan of weak alkali ASP flooding in the type II reservoir of BEXD block,it is considered that the industrial application of weak alkali ASP flooding technology for type II reservoir in Sabei development area can greatly improve oil recovery,which provides a technical support for the stable production and sustainable development of crude oil in Sabei development area.