大庆萨H开发区DX区块二类油层化学驱适应性研究

发布时间：2018-08-06 11:29

【摘要】：大庆油田已进入高含水开发阶段,开采难度逐年增加,单纯的水驱方式已无法满足生产需求,随着开发的不断深入,三次采油已成为提高采收率、保持油田可持续发展的重要技术手段,其中聚合物驱油技术已形成规模化生产,且聚合物驱的驱替对象已逐渐转向二类油层。萨H开发区中的DX区块为二类油层聚合物驱区块,其油层的差异较大,若采用相同分子量注聚,由于油层吸入剖面不均匀,层间矛盾更加突出,导致部分井的大部分聚合物溶液沿高渗透层突进,中、低渗透层没有得到有效的动用。因此,需针对此问题进行进一步分析研究。本文以大庆油田DX区块为分析对象,根据DX区块的油层物性参数,开展了针对DX区块的化学驱实验研究,以研究不同聚合物与该区块不同性质油层的合理匹配关系及各种段塞对驱油效果的影响等室内试验为基础,结合现场开发经验,制定针对DX区块的最优驱油方案,在驱油方案中本文提出根据注入井组的油层发育、井组连通状况等参数将注入井组进行分类,从而实现单井注入参数、注入浓度以及配注方案的个性化设计,达到了进一步挖掘油层潜能,提高采收率的目的,并对聚合物驱油技术有了进一步认识。现场试验结果表明：该研究可有效提高中低渗油层的动用程度,较好的控制区块内油井的含水回升速度,可为化学驱技术提供较好的理论及现场依据,对油田的后续开发具有指导意义。
[Abstract]:Daqing Oilfield has entered the stage of high water cut development, the difficulty of exploitation has increased year by year, the pure water drive mode can no longer meet the production demand, with the development of continuous deepening, tertiary oil recovery has become to improve oil recovery. In order to maintain the sustainable development of oil fields, the polymer flooding technology has formed large-scale production, and the displacement object of polymer flooding has gradually shifted to the second class reservoir. The DX block in Sah Development Zone is a second class oil layer polymer flooding block, and the difference of its reservoir is great. If the same molecular weight is used to inject polymer, the contradiction between layers will become more prominent because of the uneven suction profile of the reservoir. As a result, most of the polymer solutions in some wells protrude along the high permeability layer, and the middle and low permeability layers are not used effectively. Therefore, this problem needs to be further analyzed and studied. Taking DX block of Daqing Oilfield as an analysis object, according to the physical parameters of reservoir in DX block, a chemical flooding experiment for DX block is carried out in this paper. Based on the study of the reasonable matching relationship between different polymers and different reservoirs of the block and the influence of various slugs on the oil displacement effect, combined with the field development experience, the optimal oil displacement scheme for DX block is formulated. In the oil displacement scheme, it is proposed that the injection well group be classified according to the reservoir development and group connectivity of the injection well group, so as to realize the individualized design of the single well injection parameters, injection concentration and injection allocation scheme. The purpose of further tapping reservoir potential and improving oil recovery has been achieved, and the polymer flooding technology has been further understood. The field test results show that the research can effectively improve the production degree of low and medium permeability reservoirs, control the recovery rate of water cut in the oil wells in the block, and provide a good theoretical and field basis for chemical flooding technology. It is of guiding significance for the further development of oil fields.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46

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