聚驱前后储层物性变化及挖潜对策分析

发布时间：2018-05-25 01:09

本文选题：聚驱 + 孔隙结构　；参考：《东北石油大学》2017年硕士论文

【摘要】：聚合物驱油是三次采油技术中重要且比较成熟的技术之一,是一种有效的提高采收率的方法。聚合物由于固有的粘弹性,其水溶液注入地层,可增加水相粘度使水相渗透率减小、控制水淹层段中水相的流度、改善水相的流度比、调整吸水剖面、从而扩大波及体积,提高采收率。储层是储集油气的场所,聚合物溶液的吸附及携带作用会导致油层特征参数发生相应变化,研究聚合物驱后储层物性的变化,是聚驱后剩余油挖潜的基础。储层物性资料对整个油藏的开发过程起着重要的制约作用,那么在聚合物驱后,储层的物性参数是否发生了相应的变化,如何变化?为此,本文首先从现有资料出发,考察取心井的动态开发历程、沉积背景、砂体发育、微观孔隙结构、矿物组分及粒度中值等各方面条件,以确定可供对比聚驱前后物性参数变化的样品。在此基础上,利用聚驱前后两口取心井的大量物性测试资料,从宏观上统计孔隙度、渗透率和泥质含量的统计学变化特征;利用铸体薄片、扫描电镜和压汞分析实验精细刻画聚驱前后孔隙结构的变化特征;利用粘土矿物X衍射实验对聚驱前后粘土矿物的变化特征进行分析,并利用岩心自吸法测定聚驱前后岩心的润湿性,结合文献资料对聚驱前后的润湿性及其变化进行分析;利用CT扫描微观驱替实验研究水驱、聚驱和后续水驱的全过程,详细分析不同的驱替过程,并给出水驱、聚驱和后续水驱后微观剩余油赋存形态和不同驱替阶段剩余油的分布特征。最终通过上述研究,开展潜力分析并给出聚驱后剩余油挖潜的途径,分析实施时要注意的问题,为聚驱后区块进一步开发调整提供指导依据。
[Abstract]:Polymer flooding is one of the most important and mature techniques in tertiary oil recovery, and it is an effective method to improve oil recovery. Because of the inherent viscoelasticity, the aqueous solution of polymer can increase the viscosity of water phase and decrease the permeability of water phase, control the mobility of water phase, improve the mobility ratio of water phase and adjust the absorption profile, so as to enlarge the sweep volume. Increase oil recovery. Reservoir is the place of oil and gas reservoir. The adsorption and carrying of polymer solution will result in the corresponding change of reservoir characteristic parameters. Studying the change of reservoir physical property after polymer flooding is the basis of tapping the remaining oil potential after polymer flooding. Reservoir physical property data play an important role in the whole reservoir development process, so after polymer flooding, whether the reservoir physical parameters have changed, how to change? Therefore, based on the existing data, the dynamic development process, sedimentary background, sand body development, micro pore structure, mineral composition and particle size median of coring wells are investigated in this paper. In order to determine the comparison of polymer flooding before and after the change of physical parameters of the sample. On this basis, using a large number of physical property test data of two coring wells before and after polymer flooding, the statistical change characteristics of porosity, permeability and muddy content are analyzed macroscopically. The characteristics of pore structure before and after polymer flooding were carefully characterized by SEM and mercury injection analysis experiments, and the change characteristics of clay minerals before and after polymer flooding were analyzed by X-ray diffraction of clay minerals. The wettability of the core before and after polymer flooding was determined by core self-priming method, and the wettability and its change before and after polymer flooding were analyzed by combining the literature data, and the whole process of water flooding, polymer flooding and subsequent water flooding was studied by CT scanning micro-displacement experiment. The different displacement processes are analyzed in detail, and the microcosmic remaining oil occurrence patterns and the distribution characteristics of residual oil in different displacement stages after water flooding, polymer flooding and subsequent water flooding are given. Finally, through the above research, the potential analysis is carried out and the way of tapping the potential of remaining oil after polymer flooding is given, and the problems to be paid attention to during the implementation are analyzed, which provides the guidance basis for further development and adjustment of the block after polymer 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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