稠油热水驱用耐温纳米冻胶堵剂室内研究  

Laboratory Experimental Study on Temperature Resistant Plugging Agent for Heavy Oil Hot Water Flooding

作　　者：吴春洲[1] WU Chun-zhou(COSL Production Optimization Division,Tianjin 300459,China)

机构地区：[1]中海油田服务股份有限公司油田生产事业部,天津300459

出　　处：《当代化工》2022年第3期589-593,共5页Contemporary Chemical Industry

基　　金：天津市科技计划项目,海上中深层特稠油热采关键技术研究与应用(项目编号:20YDLZCG00190)。

摘　　要：针对稠油热水驱水窜问题,研究了一种耐温高强度且具有长期稳定性的环保型纳米冻胶堵剂,并从微观形貌、冻胶中水相存在状态角度分析了纳米二氧化硅增强冻胶稳定性机理,对其封堵性能进行了评价。结果表明:最优冻胶组成为0.5%(质量分数)阳离子丙烯酰胺类共聚物+0.1%(质量分数)潜在醛类交联剂/苯二酚类交联剂(A/B)+0.3%(质量分数)硫代尿素类除氧剂+0.5%(质量分数)纳米二氧化硅,冻胶采用潜在醛类交联剂/苯二酚类交联剂作为交联剂,毒性小,安全环保,150℃下冻胶成胶强度0.094 MPa,180 d脱水率小于3%,成胶强度高,稳定性长;冻胶微观结构是带有小孔的板状结构,孔洞中结合水含量较少,同时,纳米二氧化硅的加入使得冻胶的结合水含量上升,这说明纳米二氧化硅可以提高冻胶的亲水性,抑制冻胶脱水;150℃老化2 d后冻胶的封堵率高于98%,耐冲刷性能和长期封堵性能显著。该研究对于提高稠油热水驱开采效果具有重要意义。Aiming at the problem of water channeling in heavy oil hot water drive, an environmental friendly nano gel plugging agent with high temperature resistance, high strength and long-term stability was developed. The mechanism of nano silica enhancing gel stability was analyzed from the perspective of micro morphology and the existing state of water phase in gel, and its plugging performance was evaluated. The results showed that the optimal gel group was determined as: 0.5%(mass fraction) cationic acrylamide copolymer + 0.1%(mass fraction) potential aldehyde crosslinking agent/phenolic crosslinking agent(A/B) + 0.3%(mass fraction) deaerator + 0.5%(mass fraction) nano silica. The gel used potential aldehyde crosslinking agent/phenolic crosslinking agent as crosslinking agent, which had low toxicity, safety and environmental protection. The gel forming strength at 150 ℃ was 0.094 MPa, and the dehydration rate in 180 d was less than 3%, it had high gel strength and long stability. The gel microstructure was a plate structure with small holes, and the content of bound water in the holes was less. At the same time, the addition of nano silica increased the content of bound water, which showed that nano silica improved the hydrophilicity of gel and inhibited gel dehydration. After aging at 150 ℃ for 2 days, the plugging rate of gel was higher than 98%, and its erosion resistance and long-term plugging performance were significant. This study is of great significance to improving the recovery effect of heavy oil hot water drive.

关 键 词：稠油 热水驱 封窜 耐温 

分 类 号：TE357[石油与天然气工程—油气田开发工程]