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砂岩基质酸化酸岩反应和二次伤害机理研究是优选酸液体系与优化酸化设计的基础 ,环境扫描电子显微镜 ( ESEM)是进行此项研究的重要工具 ,其特点是 :含油水的新鲜样品无需清洗、干燥、镀膜等样品制备过程 ,可直接放在镜下观察 ,且样品可保持在 1 0 0 %湿度条件下工作。利用环境扫描电子显微镜仪器特性 ,结合岩心酸浸泡试验 ,定位观察研究了用不同酸液、在不同酸蚀时间下的砂岩岩心中长石和粘土等矿物的变化及岩心孔隙喉道和酸溶蚀孔洞的形成状况。
The study of sandstone matrix acidizing acid rock reaction and secondary injury mechanism is the basis for optimizing the acid system and optimizing acidification design. Environmental scanning electron microscopy (ESEM) is an important tool for this study, which is characterized by: no need for fresh samples containing oil and water Cleaning, drying, coating and other sample preparation process, can be placed directly under the microscope, and the sample can be maintained at 100% humidity conditions. Using the characteristics of environmental scanning electron microscope, combined with the acid pickling test, the changes of minerals such as feldspar and clay in sandstone cores under different acid etching time and the pore throat and acid dissolution pores Form the situation.