弱碱三元复合驱注入参数优化研究

发布时间：2018-06-29 19:49

本文选题：弱碱三元复合驱 + 数值模拟　；参考：《东北石油大学》2017年硕士论文

【摘要】：三元复合驱技术是近年来发展的强化采油技术,主要是通过碱、表面活性剂和聚合物的复合溶液进行驱油。室内物理实验数据和矿场实际生产数据都表明,在水驱的基础上,三元复合驱可以将采收率提高20%左右。相对于强碱三元复合驱来说,弱碱三元复合驱不仅增油降水效果相当,而且能够有效地防止采出系统结垢。目前在大庆油田内,弱碱三元复合驱油技术已被广泛应用。三元复合驱在注入的过程中,涉及到段塞尺寸用量、碱以及表面活性剂浓度等诸多的注入参数。这些因素不仅影响着油田的开发效果,还关系着油田投入与产出之间的平衡,有必要进行优化。本文针对大庆油田某实验区块进行弱碱三元复合驱注入参数的优化研究,通过对地质情况的调研,详细了解了区块的地质概况、储层性质、流体性质等特征参数。通过CMG软件对实验区的数值模型进行计算,通过不同的计算方案,对比了前置聚合物段塞尺寸、三元主段塞尺寸、主段塞中碱浓度、主段塞中表面活性剂浓度、三元副段塞尺寸、副段塞中碱浓度、副段塞中表面活性剂浓度、后置聚合物段塞以及注入速度等参数在不同情况下的驱油效果,选取了最优的注入参数组合。开展了室内流动性实验,通过对阻力系数以及残余阻力系数的研究,给出了三元复合体系与不同油藏渗透率的匹配关系,建立了残余阻力系数的数学预测模型。在此基础上,利用室内物理模拟驱油实验,对数值模拟计算的结果进行了验证。结果表明最优注入参数为:前置聚合物段塞0.04PV、三元主段塞0.35PV、主段塞中碱浓度1.2%、主段塞中表面活性剂浓度0.3%、三元副段塞0.15PV、副段塞中碱浓度1.0%、副段塞中表面活性剂浓度0.15%以及后置聚合物保护段塞0.2PV,全程注入速度0.15PV/a。本文得到的弱碱三元复合驱注入参数对制定相关开发方案、改善三元复合驱实际应用效果具有重要的指导意义。
[Abstract]:ASP flooding is a kind of enhanced oil recovery technology developed in recent years, which is mainly driven by alkali, surfactant and polymer composite solution. Both the indoor physical experiment data and the actual production data show that the ASP flooding can increase the oil recovery by about 20% on the basis of water flooding. Compared with the strong alkali ASP flooding, the weak alkali ASP flooding not only increases oil and precipitation, but also effectively prevents scaling in the recovery system. At present, weak alkali ASP flooding technology has been widely used in Daqing Oilfield. During the injection process of ASP flooding, many injection parameters such as slug size, alkali and surfactant concentration are involved. These factors not only affect the effect of oilfield development, but also affect the balance between input and output, so it is necessary to optimize. In this paper, the injection parameters of weak alkali ASP flooding in an experimental block of Daqing oilfield are studied. Through the investigation of geological conditions, the geological profile, reservoir properties and fluid properties of the block are studied in detail. The numerical model of the experimental zone was calculated by CMG software. The size of prepolymer slug, the size of ternary main slug, the concentration of alkali in main slug and the concentration of surfactant in main slug were compared by different calculation schemes. The displacement effect of the parameters such as the size of ternary secondary slug, alkali concentration in secondary slug, surfactant concentration in secondary slug, post-polymer slug and injection rate are selected. The optimal injection parameter combination is selected. Through the research of resistance coefficient and residual resistance coefficient, the matching relationship between ASP system and permeability of different reservoir is given, and the mathematical prediction model of residual resistance coefficient is established. On this basis, the numerical simulation results are verified by laboratory physical simulation oil displacement experiments. The results show that the optimal injection parameters are as follows: prepolymer slug 0.04PV. ternary main slug 0.35PV. alkali concentration in main slug 1.2. surfactant concentration 0.3in main slug 0.15PV. secondary slug 1.0 and surfactant concentration in secondary slug. The whole injection rate of 0.15% and 0.2PVP for the post-polymer protection slug was 0.15PV-a. The injection parameters obtained in this paper are of great significance for the formulation of relevant development schemes and the improvement of the practical application effect of ASP flooding.
【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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