基于AFM的三元复合驱油前后岩心介观表征

发布时间：2018-05-18 18:26

本文选题：化学驱油 + 微观孔隙结构　；参考：《东北石油大学》2015年硕士论文

【摘要】：大庆油田各区块已经进入超高含水期开发阶段,部分区块采出液的含水率已经达到98%以上。为了提高油田采收率,三次采油技术得到普遍应用。化学驱油是三次采油的主要方法,驱油过程必然会对储层微观孔隙结构产生影响。通过驱油前后微观孔隙结构的研究可以确定化学试剂在孔隙表面的沉积吸附情况以及岩石润湿性的变化情况,从而直接客观判断驱油效果。因此,详细研究化学驱油前后储层微观孔隙结构对三次采油的顺利进行具有重要意义。本文在充分调研国内外化学驱油及储层岩石微观孔隙结构方法研究的基础上,选取采油二厂南五区强碱三元复合驱试验区驱前南5-4-J725和驱后南5-2-GP30两口井对应层取芯,以及采油四厂杏二区中部强碱三元复合驱试验区驱前杏2-1-J29和驱后杏2-10-J3E7两口井对应层取芯,分别采用毛管压力曲线法、铸体薄片法、扫描电镜法、扫描共聚焦显微法、原子力显微镜法、X射线衍射及扫描探针方法在强碱三元复合驱油前后进行了储层微观孔隙结构表征。对比表征结果来看:毛管压力曲线法可以获得宏观表征数据,扫描电镜法获得大范围的微观数据,激光扫描共聚焦显微法获得储层剩余油与岩石孔隙之间的关系,原子力显微镜表征获得真实的孔喉分布真实数据,X射线和扫描探针分析获得岩石中感兴趣点的成分变化,综合以上各种方法可以构建储层岩石微观孔隙结构及其变化规律以完备表征体系。通过分析微粒迁移、地层岩石溶蚀、碱与流体反应、硅酸物生成及其聚合作用对储层微观孔隙结构的影响,进行强碱三元复合驱前后岩石成分、沉淀物质成分变化研究,结果表明微粒颗粒的迁移、颗粒表面的溶蚀以及沉淀物质的形成是造成微观孔隙结构发生变化的主要原因,并分析得出驱替时间、距注入井距离远近等因素变化对孔隙结构影响规律。此次研究所得到的结论对建立新的储层岩石孔隙结构评价体系,指导下一步油气勘探、开发及三次采油过程,具有重要意义。
[Abstract]:Each block of Daqing Oilfield has entered the stage of super high water cut, and the water cut of the produced liquid in some blocks has reached more than 98%. In order to improve oil recovery, tertiary oil recovery technology is widely used. Chemical flooding is the main method of tertiary oil recovery. The study of micropore structure before and after oil displacement can determine the depositional adsorption of chemical reagents on the pore surface and the change of rock wettability so as to judge the oil displacement effect directly and objectively. Therefore, it is important to study the pore structure of reservoir before and after chemical flooding. On the basis of the investigation of chemical flooding at home and abroad and the study of microscopic pore structure of reservoir rock, this paper selects two corresponding layers of 5-4-J725 and 5-2-GP30 in the test area of strong alkali ASP flooding in the south and fifth area of No.2 oil recovery plant to take core. And the corresponding layers of apricot 2-1-J29 before flooding and apricot 2-10-J3E7 after flooding in the test area of strong alkali ASP flooding in the middle of Xing2 area of the fourth Oil recovery Plant were cored respectively by capillary pressure curve method, casting thin slice method, scanning electron microscope, scanning confocal microscopy, etc. The micropore structure of the reservoir was characterized by atomic force microscope (AFM) and scanning probe method before and after the ASP flooding. The results show that macroscopical characterization data can be obtained by capillary pressure curve method, microcosmic data can be obtained by scanning electron microscopy, and the relationship between remaining reservoir oil and rock pores can be obtained by laser scanning confocal microscopy. Atomic force microscopy characterizes true pore throat distribution. Real data are obtained by X-ray and scanning probe analysis. The above methods can be used to construct the microscopic pore structure of reservoir rock and its variation law to complete the characterization system. By analyzing the effects of particle migration, formation rock dissolution, alkali-fluid reaction, silicic acid formation and its polymerization on the micropore structure of reservoir, the changes of rock composition and precipitate material composition before and after strong alkali ASP flooding are studied. The results show that the migration of particles, the dissolution of particle surface and the formation of precipitated material are the main reasons for the change of micropore structure, and the displacement time is obtained. The change of distance from injection well affects the pore structure. The conclusions obtained by this study are of great significance for the establishment of a new evaluation system of reservoir rock pore structure and for guiding the next oil and gas exploration, development and tertiary oil recovery process.
【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

【共引文献】