锦州9-3油田聚合物驱产液能力研究

发布时间：2018-12-25 12:33

【摘要】：聚合物驱后产液能力通常会出现一定幅度的下降,与陆上油田相比,海上油田具有层系多、非均质性严重、储层胶结疏松易出砂、井距大、排量大等特点,其注聚后产液能力下降幅度更大,以锦州9-3油田为例,该油田2007年开始注聚,截至2015年8月,平均月产液量与注聚前相比整体下降48%左右,平均单井月产液量最大降幅达82%,对聚合物驱开发效果产生了较大影响。因此,有必要结合海上油田油藏特征及开发特点,开展海上油田聚合物驱产液变化规律及影响因素研究,从而指导聚合物驱过程中改善产液能力调整方案的制定。本论文以锦州9-3油田作为研究对象,在调研国内外产液变化研究基础上,采用油藏工程、数值模拟与室内物理模拟相结合的方法,研究了含水率、聚合物黏度、渗透率、渗透率级差4个因素对产液指数变化的影响。结果表明:空白水驱至聚合物驱含水95%过程中产液指数变化曲线分成三段,即上升段、下降段和上翘段。其中,转聚时机越早,产液指数最大降幅越小,反之,产液指数最大降幅越大,不同转聚时机下产液指数最大降幅在60%~73%之间;渗透率越高,极值距离越小,极值距离变化范围在0.27~0.83PV间;聚合物黏度越高,产液指数最大降幅和极值距离越大,产液指数最大降幅在11%~75%间,极值距离在0.22~0.55PV间;渗透率级差越大,产液指数最大降幅和极值距离越小,产液指数最大降幅在53%~63%间,极值距离在0.19~0.59PV间。在锦州9-3油田历史拟合基础上,研究了34口油井产液指数变化规律,结果表明,产液指数最大降幅在35%~45%范围,极值距离在0.1~0.3PV范围。
[Abstract]:Compared with onshore oil fields, offshore oilfields are characterized by many layers, serious heterogeneity, loose cementation, easy sand production, large well spacing and large displacement. For example, Jinzhou 9-3 oilfield began to inject polymer in 2007. By August 2015, the average monthly liquid production decreased by about 48% compared with that before polymer injection. The maximum drop of monthly liquid production in single well is 82%, which has a great influence on polymer flooding. Therefore, it is necessary to combine the characteristics of offshore oil field reservoir and development characteristics, to carry out research on the variation law and influencing factors of polymer flooding in offshore oil field, so as to guide the formulation of the adjustment scheme for improving the production capacity of polymer flooding. This paper takes Jinzhou 9-3 oilfield as the research object, on the basis of investigation and research on the variation of liquid production at home and abroad, adopts the method of reservoir engineering, numerical simulation and indoor physical simulation to study water cut, polymer viscosity and permeability. The influence of four factors of permeability difference on the change of liquid production index. The results show that the change curve of liquid production index is divided into three sections, namely, rising stage, descending section and upwarping section during the process of water flooding from blank water to 95% water cut in polymer flooding. Among them, the earlier the polymerization time, the smaller the biggest drop of liquid production index, whereas, the bigger the biggest drop of liquid production index, the biggest drop of liquid production index is between 60% and 73% under different polymerization time. The higher the permeability is, the smaller the extreme distance is, and the range of extreme distance is between 0.27~0.83PV; The higher the viscosity of polymer, the greater the distance between the maximum drop of liquid yield index and the extreme value. The maximum drop of liquid production index is between 11% and 75%, and the distance of extreme value is between 0.22~0.55PV. The greater the permeability difference, the smaller the maximum drop of liquid production index and the distance between extreme value. The maximum drop of liquid production index is between 53% and 63%, and the distance of extreme value is between 0.19~0.59PV. On the basis of historical fitting of Jinzhou 9-3 oilfield, the variation law of liquid production index in 34 wells is studied. The results show that the maximum drop of liquid production index is in the range of 35 ~ 45% and the distance of extreme value is in the range of 0.1~0.3PV.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

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