高温高矿化度油藏聚合物调驱技术研究

Research on polymer profile control and oil displacement technology in high temperature and high salinity reservoir

江苏油田具有高温、高矿化度和非均质性严重等特征,目前油田已处于特高含水开发阶段中后期,迫切需要采取进一步提高原油采收率的技术措施。近年来,随着Cr3+/HPAM凝胶调驱技术的日益成熟,开发出适合高温、高矿化度油藏的Cr3+/HPAM凝胶,已具备了物质和技术基础。针对江苏油田开发的实际需求,利用仪器检测和现代物理模拟方法,对适合江苏油田流体性质和油藏特征的Cr3+/HPAM凝胶配方进行了筛选,并对凝胶在多孔介质内的流动特性和调驱效果进行了实验研究。结果表明,聚铬比、聚合物质量浓度和岩心渗透率是影响凝胶注入的主要因素,"调剖+聚合物驱"要比单一的聚合物驱增油效果好。

At present, the development of Jiangsu Oilfield with the characteristics of high temperature, high salinity and serious heterogeneity has been the late development stage with extra-high water-cut, and there is an urgent need to take further measures to enhance oil recovery. Recently, with the increasingly mature of Cr3＋/HPAM gel profile control and displacement technology, the Cr3＋/ HPAM technology with material and technical base, which is suitable for high temperature and high salinity, has been developed. Aiming at the actual demand in the development of Jiangsu oilfield, the authors screen the Cr3＋/HPAM gel formulations which are fit for the fluid nature and characteristics of Jiangsu oilfield reservoir by using the detection equipment and modern physics simulation, and do some researches on the flow characteristics and displacement effect of gel in porous media. The results show that the ratio of polymer and Cr3＋, the polymer concentration and the core permeability are the main factors that affect the ability of gel injection, and the increased oil effect by using the slug composition of profile controls plus polymer flooding is good, which is superior to pure polymer flooding.