摘要
为解决硬脆性泥页岩地层的井壁失稳问题,利用X线衍射仪、扫描电子显微镜和CT成像数字岩心分析等,测试川西地区须家河组三段的岩样,分析硬脆性泥页岩水化过程中微观结构变化的过程和规律.结果表明:矿物颗粒间天然微孔缝的毛细管效应促进内部矿物水化,水化作用又促进次生孔缝的产生扩展,是导致微观结构发生变化直至宏观破坏的主要原因之一;初始微观结构破坏主要发生在矿物颗粒间面面或点面接触结构界面;微观结构变化本质上表现为微观裂纹的扩张、扩展演变.
In order to solved the wall instability problems of the clay shale formation, we used X-ray diffraction scanning electron microscope and digital core analysis of CT imaging equipment, tested the core of the Xujiahe three sections in Chuanxi, analyzed the change and law of the microstructure process in hydration process of clay shale. The results showed that the capillary effect of the natural microporous seam in mineral grains promoted the internal hydration, the hydration promoted the generation of the secondary hole and fissure, such mutual promotion was one of the primary cause that generated the microcosmic structure change or even damage. The initial microscopic structure occurred mainly in the mineral particles that contact for surface-face or point-to-face structure interface. The change of the microscopic structure expanded and extended evolution of the microscopic cracks.
出处
《大庆石油学院学报》
CAS
北大核心
2011年第6期28-34,124,共7页
Journal of Daqing Petroleum Institute
基金
中国石化重点科技攻关项目(P10037)
关键词
硬脆性泥页岩
微观结构
水化作用
变化规律
颗粒界面
hard-brittle shale
microstructure
hydration
variation pattern
particle interface
作者简介
石秉忠（1966-），男，博士生，高级工程师，主要从事深井与超深井钻井液技术方面的研究．
