萨中开发区周期交替注聚技术研究

发布时间：2019-05-16 18:59

【摘要】：萨中开发区一类油层聚合物驱自1996年投入工业化应用以来,经历了从中分、高分到超高分及从普通浓度到高浓度的研究推广过程,使得提高采收率的幅度不断增加。但从注聚过程中油层的动用状况看,纵向上渗透率差异较大的单井以及油层性质相对较差的层,它们的动用状况不理想。近几年,相关研究单位对交替注入进行了深入研究,得出交替注入可以提高油层采收率,同时也可以节约聚合物干粉。按照大庆油田有限责任公司聚驱“520”工作目标和“四最”要求,在萨中开发区选取注聚区块——南一区西东块2号注入站作为试验区,开展不同分子量、不同浓度的周期交替注入试验,探索进一步提高采收率及节约干粉的新途径。本文在对试验区油藏精细描述的基础上,对南一区西东块2号注入站一类油层的储层特征、储量分布、现井网的动用状况及剩余油潜力进行了系统分析;通过不同分子量聚合物的周期交替注聚,并结合压裂、分注、调剖等措施提高了薄差油层注入能力和动用程度,高效利用聚合物,降低了聚合物费用,进一步改善区块开发效果。试验阶段提高采收率达到12%,节约化学剂成本21.7%。本次试验成果可应用于主力油层125m井距聚驱工业化区块,在不影响最终提高采收率的前提下,节约聚合物费用,降低成本,体现经济效益的最大化,对于主力油层小井距以及二类油层聚合物驱交替注入的研究应用具有指导和借鉴意义。
[Abstract]:Since the first class of reservoir polymer flooding in Sazhong Development Zone was put into industrial application in 1996, it has gone through the research and popularization process of middle score, high score to super high score and from ordinary concentration to high concentration, which makes the range of improving oil recovery increasing. However, from the point of view of the production situation of the reservoir in the process of polymer injection, the production condition of the single well with great permeability difference and the layer with relatively poor reservoir properties is not ideal. In recent years, the relevant research units have carried out in-depth research on alternating injection, and it is concluded that alternating injection can improve reservoir recovery and save polymer dry powder at the same time. According to the target of polymer flooding "520" and the requirements of "four best" in Daqing Oilfield Co., Ltd., the injection station No. 2 of Xidong Block, Nanyi District, is selected as the experimental area in Sazhong Development Zone to carry out different molecular weights. In order to explore a new way to further improve oil recovery and save dry powder, different concentrations of cyclic alternating injection test were used to explore a new way to further improve oil recovery and save dry powder. Based on the fine description of the reservoir in the experimental area, this paper makes a systematic analysis of the reservoir characteristics, reserve distribution, production status of the present well pattern and the remaining oil potential of the No. 2 injection station in the Xidong Block of the South 1 area. Through cyclic alternating polymer injection of different molecular weight polymers, combined with fracturing, split injection, profile control and other measures, the injection ability and production degree of thin difference reservoir are improved, the polymer is used efficiently, and the cost of polymer is reduced. Further improve the development effect of the block. In the experimental stage, the oil recovery is increased by 12% and the cost of chemical agent is saved by 21.7%. The test results can be applied to 125 m well distance polymer flooding industrial block of the main reservoir. Without affecting the final improvement of oil recovery, the polymer cost can be saved, the cost can be reduced, and the economic benefit can be maximized. It has guiding and reference significance for the research and application of small well spacing in the main reservoir and alternating injection of polymer flooding in the second type of reservoir.
【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

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