西南石油大学学报（自然科学版）2016，Vol.38Issue(3)：178-186,9.DOI:10.11885/j.issn.1674-5086.2014.04.10.05
龙马溪组硬脆性页岩水化实验研究
Hydration Experiment of Hard Brittle Shale of the Longmaxi Formation
摘要
Abstract
The hydration of hard brittle shale has an important influence on the borehole stability. Therefore,the hydration experiments was done for different types of shale from the Longmaxi formation in the south region of Sichuan Basin,observa-tions were made to mineral composition,microstructure,hydration swelling stress,water absorption by self-priming and core immersion. And based on observations,the paper discusses the hard brittle shale hydration process and hydration mechanism. The result shows that the main clay mineral of shale is illite,the shape of the clay mineral particles is flake and directional alignment. There are lots of bedding and micro-crack in the shale,which provide the operation-space and flow channel for the hydration of shale. The hydration swelling stress and water absorption by self-priming of shale tend to ascent first before becoming stable. The fabric of the shale has an important influence on the ascend velocity or extent. The fractures in the surface of sample are parallel plane of bedding in the process of immersion. With the increase of immersion time,the sample would keep its integrality or spall to pieces. The fabric and cementation type of the shale have an important influence on the hydration swelling. The hydration of the shale is a result of coupling of physical-chemical action and mechanical action,the former decreasing the rock fracture toughness,and the later increasing the stress intensity factor for mode-I fracture. When the stress intensity factor is greater than the rock fracture toughness,the crack will extend or broaden.关键词
硬脆性页岩/龙马溪组页岩/水化作用/自吸吸水率/物理化学作用/力学作用Key words
hard brittle shale/Longmaxi Formation shale/hydration swelling/spontaneous imbibition rate of water/physical-chemical action/mechanical action分类
能源科技引用本文复制引用
刘向君,熊健,梁利喜..龙马溪组硬脆性页岩水化实验研究[J].西南石油大学学报（自然科学版）,2016,38(3):178-186,9.基金项目
国家自然科学基金联合基金重点项目（U1262209）；国家自然科学基金（51274172）。 （）
