摘要
调剖堵水作为常用的稳油控水技术,对于油井稳产起到重要的作用,但是由于国内油层非均质严重,加上多轮次调剖作业,使得调堵效果变差,有效期缩短;拟将调剖和堵水技术相结合,在优选得到的调剖剂和堵水剂基础上,对高强度凝胶调剖剂微观成胶结构进行了电镜分析,采用室内岩心实验,对注水井调剖结合采油井堵水的方法的可行性进行评价,并对调堵结合用量和顺序进行优化。研究结果表明,堵剂微观结构密实,具有良好的注入选择性和封堵能力,调堵结合増油效果明显好于单独调剖或堵水,且调堵结合宜采用"先调后堵"的方式,以0.2 PV调剖剂+0.1 PV堵水剂的用量的驱油效果最好。实验研究的结果对于改善调堵效果和方案设计提供了技术思路和参考依据。
Profile control and water shutoff are two of common technologies to decrease water-cut and sustain oilproduction. Because of severe original heterogeneity and long-term water flooding, multi-round profile controlsmake the effect worse and shorten the validity. Here, combining profile control work over from injection wells andwater shutoff from production wells can be a candidate to control the water production. Based on the screened pro-file control and water shutoff agents, the microscopic structure of the gel as profile control agent was observed byelectron microscope. Also, the feasibility of combining profile control with water plugging was evaluated by coreflooding tests. Meanwhile, the slug size and injecting sequence of water control agents were optimized. The resultsshowed that, the recovery of combination of water shut off with profile control is higher than one of them. For theinvestigated profile control agents, the tight microstructure can be observed, which ensured the high plugging inten-sity. Combining 0.2 PV profile control and 0. 1 PV water shutoff agents can achieve high oil production, and it isrecommended to inject water shutoff after profile control. The laboratory results are helpful for improving water con-trol effect and providing the data for project design.
出处
《科学技术与工程》
北大核心
2014年第26期214-218,共5页
Science Technology and Engineering
基金
国家重大科技专项(20112x05009004)
中国石油大学(北京)科研基金(2462012KYJJ23)资助
关键词
调剖
堵水
调堵结合
参数优化
岩心驱替
profile control
water shutoff
combination of profile control with water shutoff
parameter optimization
core flooding
