聚合物驱后期油藏注采耦合技术提高采收率研究及应用  

Research and application of injection-production coupling technology for enhancing oil recovery in reservoirs at later stage of polymer flooding

作　　者：李宗阳 谭河清[3] 李林祥[3] 曹绪龙[4] 崔文福[3] 陈孝芝 王业飞[1] 李文华[3] LI Zongyang;TAN Heqing;LI Linxiang;CAO Xulong;CUI Wenfu;CHEN Xiaozhi;WANG Yefei;LI Wenhua(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;Gudong Oil Production Plant,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257237,China;Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [3]中国石化胜利油田分公司孤东采油厂,山东东营257237 [4]中国石化胜利油田分公司,山东东营25700

出　　处：《油气地质与采收率》2019年第6期115-121,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“高温高盐油田化学驱提高采收率技术”（2016ZX05011-003）

摘　　要：胜利油区适合化学驱的Ⅰ,Ⅱ类优质油藏资源已基本得到动用,化学驱资源接替难度大,设计应用聚合物驱后期油藏注采耦合技术,延长注聚项目经济有效期。基于物理模拟实验研究方法,采用可视化模拟驱替装置,研究聚合物驱后期油藏连续注采和注采耦合条件下聚合物驱液流波及范围和剩余油分布特征。结果表明:相比连续注采模式,注采耦合能够改变常规流线方向,更好地扩大液流波及体积,动用低渗透区域部分剩余油,达到提高采收率目的。以聚合物驱后期油藏孤东油田八区Ng3-4单元为例,建立以Ng32层为主的数值模型,开展注采耦合结构和实施周期数值模拟优化研究。研究结果表明,聚合物驱后期油藏注采耦合技术可有效改变已有老流线,扩大分流线波及范围,降低化学剂用量,进一步提高特高含水期油藏采收率,优化推荐注采耦合结构为一轮次与二轮次开井时间比例为1∶1的对称型结构,每轮次开井时间均为3个月,以指导聚合物驱后期油藏单元高效开发;优选10个井组实施矿场试验,试验结果表明,含水率回返趋势得到有效控制,月降低聚合物干粉用量约为10.8 t/月,吨聚增油值提高7.6 t/t,预测可进一步提高采收率1.7%。The Type I and II reservoir resources suitable for chemical flooding in Shengli Oilfield have been basically produced,and the resource replacement is difficult by chemical flooding. An injection-production coupling technology is designed to prolong the economic validity period of polymer flooding projects at later stage. Based on the physical simulation experiment,a visualized simulated displacement apparatus is used to study the swept volume and the residual oil distribution characteristics under conventional injection-production and injection-production coupling technology at the later stage of polymer flooding. The results show that compared with conventional injection-production methods,injection-production coupling approach can change the direction of conventional streamline,enlarge the swept volume and produce the remaining oil in low permeability area to achieve the purpose of enhancing oil recovery. Taking Ng3-4 unit in No.8 Block of Gudong Oilfield during polymer flooding at the later stage as an example,a reservoir numerical model for the Ng32 Submember is established. The optimization of injection-production coupling structure and implementation cycle is performed by numerical simulation. The results show that the coupling technology for chemical flooding can effectively transform the existing streamlines,expand the swept area of the diversion streamline,reduce the usage of chemical agents and further improve oil recovery in the reservoir under extra-high water cut stage. The optimized coupling structure of injection-production is the symmetrical structure with the ratio of production time between one round to two rounds being 1∶1. The production time of each round is three months. Then ten well groups are selected to carry out field test. After field implementation,the water-cut returning trend is effectively controlled,the dry powder of polymer is reduced by 10.8 tons per month and the incremental oil production per ton of polymer is increased by 7.6 t/t. The enhanced oil recovery is predicted to f

关 键 词：聚合物驱后期油藏 化学驱 注采耦合 数值模拟 提高采收率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]