摘要
泥页岩地层与其它“惰性”岩石不同，当其与水基钻井液接触时，岩体强度、内部应力都将随钻井液类型及地层与钻井液的接触时间变化而变化，因此，一个有效的力学本构方程应该能够体现出发生在泥页岩地层中的力学和物理化学动态过程，ＹｅｗＣＨ等在这一领域作了开创性工作；并引用ＹｅｗＣＨ等提出的水化应力模型，计算分析了水化对水敏性泥页岩地层井周应力分布状态，地层坍塌应力和破裂应力的影响。
Shale formation is different
from inactiverocks when contacting with water-based drilling fluid, rock strength and the internal
stress around borehole in the hale formation will change with mud properties and time in which
shale formation had been opened. Finally stability will be decreased. The effects of hydration
on stresses distributions, caving pressure and fracture pressure of shale formation around
borehole had been studied quantitatively. The results have illustrated that shale hydration will
decrease the fracture pressure, and increase caving pressure.
出处
《西南石油学院学报》
CSCD
1999年第2期49-52,共4页
Journal of Southwest Petroleum Institute
关键词
水化学
井眼稳定
泥页岩
钻井
地层
井塌
equation of state,
hydrochemitry, hole status, hole stability, rock mechanics, rock mechanics, rock stress,
mudstone, shale
