稠油蒸汽驱深部调堵技术研究

Performance of Indepth Water Shutoff and Profile Control Agent for Steam Flooding in Heavy Oil Reservoir

刘 强 马自俊 李世超 欧阳坚 刘国良

LIU Qiang MA Zi-Jun LI Shi-Chao OU Yang-Jian LIU Guo-Liang

研制了一种适用于稠油蒸汽驱防深部蒸汽窜的液流转向剂（由2%改性甲阶酚醛预聚体和1%缓释酸组成），并考察了该体系的延缓缩聚性、抗高温性及长期稳定性。实验表明：改性甲阶酚醛预聚体在高矿化度盐水中，如200 g/L的氯化钠、4.1 g/L氯化钙、7 g/L六水合氯化镁等盐水中均能形成均相、透明、低黏的水溶液。80℃以下老化1周，溶液状态稳定，满足转向剂被选择性注入到地层深部高渗通道的要求。在高温蒸汽的作用下，缓释酸快速分解产酸，催化甲阶酚醛预聚体缩聚固化，形成封堵率高、封堵强度大、耐水流冲击的酚醛树脂。200℃下老化3个月或120℃盐水中老化半年后，凝胶物化性能变化很小，可有效减少多轮次同层位重复调堵施工。

In this paper, a new indepth water shutoff and profile control agent composed of 2% modified water soluble phenic resin and 1% thermo-sensitive latent acid was presented, which is used to reduce indepth steam channeling in heavy oil reservoir. The performance of delaying polycondensation, high temperature tolerance and long-term stability was investigated. The results tests showed the homogeneous transparent and low viscous solution was formed at brine with high salinity, such as 200 g/L NaCl, 3.5g/L CaCl2, or 7g/L MgCl2·6H2O solution. The said solution kept stable after aging one week under temperature lower than 80℃, which met the need of selective injection of diverting agent into the deep formation with high permeability channel. Thermosetting phenolic resin was catalyzed to solidify by the latent acid under the temperature higher than 100℃，whose plugging rate reached 100%, plugging strength and resistance to stream reached five thousands pascal. The gel properties kept stable after storing more than three months at 200℃.