次生底水油藏的三元复合驱替特征及影响因素

ASP Flooding Characteristics and Influencing Factors of Secondary Bottom Water Reservoirs

吕端川 林承焰 任丽华 宋金鹏

LüDuanchuan LINChengyan LINChengyan RENLihua

中国石油塔里木油田分公司，新疆 库尔勒 841000 中国石油大学(华东)地球科学与技术学院，山东 青岛 266580 山东省油藏地质重点实验室，山东 青岛 266580

PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China Shandong Provincial Key Laboratory of Reservoir Geology, Qingdao, Shandong 266580, China

原生整装油藏经过长期注水开发后，逐渐演化为次生底水油藏。次生底水油藏的剩余油类型包括中上部的弱动用可动剩余油、中下部水驱绕流式可动剩余油和高水淹区的水驱后残余油。对该类型油藏开展三元复合驱以进行挖潜。利用油井生产数据，将三元复合驱替历史分为驱油剂的受效前期、持续受效期和受效后期3个阶段，确定驱油剂持续受效期时间跨度。利用驱替特征曲线定量化确定各井在驱油剂持续受效期的驱替能力，同时分析了影响驱替效果的工程和地质及化学因素。结果表明，次生底水油藏的三元复合驱开发特征与常规底水油藏开发明显不同，而工程和地质因素对该两种油藏类型生产特征的影响作用是相似的。驱油剂中的聚合物组分对整个开发历史的油水渗流具有重要的影响。

After long-term water-flooding extraction, primary integrated reservoir gradually evolves into secondary bottom water reservoir, and its remaining oil can be categorized as the weakly movable remaining oil in the upper-middle part, the by-passed movable remaining oil in the lower middle part, and the residual oil after water flooding in the high water flooded area. The tapping potential of such oil reservoir is exploited with ASP flooding. Based on the production data, the ASP flooding history is divided into three stages, namely the pre-effective stage, sustained effective stage, and the post-effective stage, and the time span of sustained effective stage is calculated. With quantified displacement characteristic curve, displacement capacities of wells in the sustained effective stage are calculated. Also, engineering, geographical, and chemical factors that affect the displacement effect are analyzed. The results show that the development characteristics of APS flooding in secondary bottom water reservoir differ considerably from those of conventional bottom water reservoirs, while the engineering and geographical factors have similar effects on these two reservoirs. The polymer components in oil displacement agents play an important part in oil-water seepage throughout the development history.

10.11885/j.issn.1674-5086.2020.06.01.01