石油钻采工艺Issue(3)：48-52,5.DOI:10.13639/j.odpt.2015.03.012
应用CT技术研究钻井液污染三维空间分布特征
Research on 3D spatial distribution features of drilling lfuid pollution using CT technology
摘要
Abstract
The understanding on spatial distribution features of oil/gas reservoir pollution by conventional liquid drilling technique is a concern of many scholars. The authors used high-energy, high-precision CT instrument to explore the 3D spatial distribution features of full-diameter core after being polluted by drilling lfuid, established the corresponding test method and the means of quantitatively determined the ifltration depth of drilling lfuid, and obtained the 3D spatial distribution diagram of drilling lfuid pollution under various conditions. Besides, the authors analyzed the microscopic features of porous and fractured reservoir drilling lfuid pollution with the help of scanning electron microscope and energy spectrum. The research shows that the drilling lfuid ifltration depth mainly occurs at 11 mm to 24 mm from the core end face. After being polluted by drilling lfuid, the core from porous and fractured reservoirs shows‘pot-bottom’ feature of polluted space. And from fractured reservoir cores, it can be observed that drilling lfuid has penetrated the whole fracture. Pressure difference and fracture conductivity are the main factors restricting drilling lfuid from invading the matrix pore depth. The introduced particles in fractures are mainly barite grains and salt crystals and distributed in regional iflter cake and aggregated grains. The introduced particles in matrix porous reservoirs are mainly salt crystals and distributed in the forms of settlement on pore faces, pore iflling and throat plugging. The research ifndings provide an essential understanding on the mechanism of drilling lfuid pollution features in porous and fractured reservoirs and provide a new research method for indoor experimental evaluation.关键词
钻井液污染/三维特征/CT扫描/裂缝-孔隙型储层/评价Key words
drilling lfuid pollution/3D feature/CT scanning/fracture-pore type reservoir/evaluation分类
能源科技引用本文复制引用
张福祥,汪周华,郭平,符馨月,杨向同,牛新年..应用CT技术研究钻井液污染三维空间分布特征[J].石油钻采工艺,2015,(3):48-52,5.基金项目
国家科技重大专项“超深超高压高温气井试油完井及储层改造技术”（编号2011ZX05046-03）。 （）
