不同非均质储层聚合物浓度与分子量优选研究

发布时间：2018-09-09 17:08

【摘要】：当前,大庆油田三次采油聚合物驱的主要目标已由一类油层转移到二类油层。由于二类油层是非均质的,目前国内外聚合物驱一般都只根据注聚层的平均渗透率来设计聚合物的分子量和浓度则变得不符合实际状况。为此本文的研究对象是针对二类油层的地质特点,采用不同性质的聚合物所配制的溶液进行室内物理模拟试验,从而,了解其效果和规律,探讨进一步改善效果的途径,明确了水驱和聚驱阶段提高采收率的工作重点。本文针对非均质储层采用物理模拟实验详细设计了多种分子量聚合物及注入浓度,同时采用CT聚驱在线监测非均质模型总体及分层剩余油饱和度分布状况。最终得出在注入能力允许的条件下,要尽可能选用较大分子量的聚合物。对于二类油层来说,中分子高浓度聚合物效果较好,在达到一定粘度的同时,同时具有较好的注入性,总体看来1600万分子量聚合物及较高浓度注入效果好,高分子高浓度聚合物溶液注入性差,低分子、低浓度聚合物溶液粘度低、效果差。本文的研究对大庆油田进一步提高聚合物采收率,减少聚合物用量,提高经济效益有重要作用。
[Abstract]:At present, the main target of tertiary oil recovery polymer flooding in Daqing Oilfield has been transferred from the first class reservoir to the second class reservoir. Due to the heterogeneity of the second kind of reservoir, the molecular weight and concentration of polymer in polymer flooding design only according to the average permeability of polymer injection layer at home and abroad is not in line with the actual situation. Therefore, the research object of this paper is to carry out the indoor physical simulation test with the solution prepared by different polymers in view of the geological characteristics of the second class reservoir, so as to understand its effect and law, and to explore the ways to further improve the effect. The emphases of improving oil recovery in water flooding and polymer flooding are defined. In this paper, a variety of molecular weight polymers and injection concentrations are designed in detail by physical simulation experiments for heterogeneous reservoirs. At the same time, CT polymer flooding is used to on-line monitor the overall heterogeneous model and the distribution of remaining oil saturation in layers. Finally, when the injection ability is allowed, the polymer with high molecular weight should be selected as far as possible. For the second class oil layer, the high concentration polymer of middle molecular weight has better effect, and it has good injectability at the same time when it reaches a certain viscosity. On the whole, 16 million molecular weight polymer and higher concentration of polymer have good injection effect. The polymer solution with high polymer concentration has poor injectability, low molecular weight, low viscosity and poor effect. The research in this paper plays an important role in improving polymer recovery, reducing polymer consumption and increasing economic benefit in Daqing Oilfield.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46

【相似文献】