石油钻采工艺2016，Vol.38Issue(3)：277-285,9.DOI:10.13639/j.odpt.2016.03.001
硬脆性泥页岩井壁稳定研究进展
Research progress of wellbore stability in hard brittle shale
摘要
Abstract
Wellbore instability in hard brittle shale is a key problem restricting the effective development of deep resources and unconventional resources (e.g. shale gas). In this regard, this paper presents the basic analysis methods of wellbore stability under three scenarios (i.e. mechanics, stress-seepage coupling and seepage-stress-chemical coupling) and their application conditions, with consider-ation to the features, composition and structure of hard brittle shale. This paper also discusses four mechanical instability mechanisms of hard brittle shale, the driving action for drilling lfuid invading into fractures, the strength weakening mechanism with and without active clay mineral, and the calculation model for wellbore stability with different forms of fractures. It is concluded that the key factors inlfu-encing wellbore stability analysis are the existence of active clay minerals in hard brittle shale matrix and fracture ifllings and the fracture distribution laws. Microscopic description of the progressive wellbore instability process which is induced by propagation and connec-tion of fractures in hard brittle shale under the action of multiple-ifeld coupling will become a hotspot and dififculty in future research.关键词
硬脆性/泥页岩/井壁稳定/研究进展Key words
hard brittle/shale/wellbore stability/research progress分类
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赵凯,樊勇杰,于波,韩继勇,许永华,高诗惠..硬脆性泥页岩井壁稳定研究进展[J].石油钻采工艺,2016,38(3):277-285,9.基金项目
陕西省教育厅科研计划项目“页岩气储层水平井井壁失稳机理研究”（编号14JK1583）；西安石油大学博士科研启动项目“多结构面地层井筒失稳控制理论及方法研究”（编号2014BS02）。 （）
