石油钻采工艺Issue(1)：57-60,4.DOI:10.13639/j.odpt.2014.01.015
钻井液活度对硬脆性页岩破坏机理的实验研究
Experimental research on brittle shale failure caused by drilling lfuid activity
摘要
Abstract
The failure mechanism formed under the action of circular medium lfuid around the wellbore of brittle shale has been a hot issue in recent years. The water activity difference between the drilling lfuid and shale will directly affect the formation mechanism brittle shale fracture. The model of activity-inlfation-hydration is set up ifrstly through revising generalized Usher model. For this model, it states that the wellbore is in non-osmotic hydration stage within the critical expansion ratio, and thus puts forward the concept of ac-tivity window according to the drilling lfuid activity range, and this is veriifed by indoor test. Results show that the different activity of drilling lfuid brings difference in rock strength in macro and time sensitive effect for internal structure of rock in micro. This mechanism can provide a more accurate range design for drilling lfuid activity and strong guarantee for wellbore stability.关键词
钻井液活度窗口/硬脆性页岩/活度-膨胀率模型/临界膨胀率/破坏机理Key words
drilling lfuid activity window/brittle shale/activity-inlfation model/critical expansion ratio/failure mechanism分类
能源科技引用本文复制引用
温航,陈勉,金衍,招军,叶西安,杨顺辉..钻井液活度对硬脆性页岩破坏机理的实验研究[J].石油钻采工艺,2014,(1):57-60,4.基金项目
国家重点基础研究发展计划（973计划）“深井复杂地层安全高效钻井基础研究”（编号2010CB226701；国家科技重大专项“力学与化学耦合井眼稳定技术研究”（编号2011ZX05031-004-001-001）。 （）
