文档介绍：优质
摘要
近几年来,聚合物驱油技术在油田得到广泛应用。为适应油田聚合物驱的需求,本文在聚驱提高原油采收率原理的基础上,通过物理模拟实验和数值模拟技术,研究了聚合物的弹性效应、聚合物分子构型、聚合物段塞组合、油层厚度和油层垂向渗透率对聚驱开发效果的影响。结果表明:聚合物的弹性效应可提高原油采收率,~;清水聚合物溶液中聚合物分子以网状构型为主,增粘效果较好,污水聚合物溶液中聚合物分子以枝状构型为主,增粘效果较差;聚合物段塞尺寸和粘度是影响聚驱效果的决定因素,段塞尺寸保持不变时,溶液粘度越高,采收率增幅越大,溶液粘度保持不变时,段塞尺寸越大,采收率增幅越大;对于水湿油层,油层越厚,增采效果越好,而油湿油层的厚度对聚驱采收率影响不大;对于正韵律油层,垂向渗透性越强,聚驱增采幅度越高,反之,越低,对于反韵律油层,垂向渗透性越差,聚驱增采幅度越高,反之,越低。文中还提出了一些改善聚驱开发效果的措施,包括:采用污水配制聚合物溶液、优选聚合物注入速度和优选井网井距。本文对油田进行聚合物驱油具有一定的指导意义。
关键词:聚合物驱油;影响因素;改善措施;物理模拟;数值模拟
Abstract
In recent years, polymer flooding technology was widely applied in oilfield. In order to adapt the demands of oilfield polymer flooding, in this paper, on the basis of polymer flooding EOR mechanism, by physical simulation experiments and numerical simulation techniques, we mainly studied the influential factors of polymer flooding effect, including polymer solution elastic effect, polymer molecular structure, polymer bination, reservoir thickness and reservoir vertical permeability. The result showed that the polymer solution elastic effect can enhance oil recovery, and its optimum quality concentration was ~. Polymer molecular had work structure in fresh water, and its solution had higher viscosity, on the other hand, polymer molecular had dendritically structure in sewage water, and its solution had lower viscosity. Polymer slug size and viscosity were the decisive factors which influenced polymer flooding effect. In the case of unchanged polymer slug size, the higher the solution viscosity was, the greater the polymer flooding increased recovery. When polymer solution viscosity was not changed, the larger the slug size was, the higher the oil increased. For water-wet oil reservoir, the thicker the oil reservoir was, the better the polymer flooding increased oil recovery, but for oil-wet reservoir, reservoir thickness had little influence on polymer flooding recovery. For positive rhythm reservoir, the better the vertical permeability was, the