大斜度井泥页岩井壁稳定的力学分析  

Mechanical Analysis of the Stability of HighlyInclined Boreholes in Shale Formations

作　　者：楼一珊[1] 刘刚[1] 

机构地区：[1]江汉石油学院石油工程系

出　　处：《江汉石油学院学报》1997年第1期61-64,共4页Journal of Jianghan Petroleum Institute

摘　　要：大斜度井泥页岩的井壁稳定对油气井的正常钻井十分重要。从岩石力学的角度出发，根据地壳岩石的特性建立了各向同性的线弹性力学模型，并用莫尔库仑强度准则对井壁失稳进行了分析。对油田的实际资料进行计算表明，井壁坍塌压力与井斜度和井斜方位角有关。井壁坍塌压力随井斜角与井斜方位角的变化规律主要由地层的原地应力状态决定。对于我国的大部分油田，直井的坍塌压力比大斜度井大。Wall stabilization of highly inclined shale boreholes is important to drill a well successfully.On the basis of rock mechanism and properties of crustal rocks,a linear and elastic model for anisotropic formations is established,and their stabilization is analysed by means of MohrCoulomb yield criteria.Calculation of practical data from oil fields demonstrates that formation sloughing pressure is dependent on deviation angle and well azimuth.Their changes are determined mainly by stress of formation.In most fields in China,sloughing pressure in straight boreholes is larger than in highly inclined ones.

关 键 词：大角度斜井 井眼稳定 页岩坍塌 钻井工艺 油气井 

分 类 号：TE243[石油与天然气工程—油气井工程] TE21