中国石油大学学报（自然科学版）2016，Vol.40Issue(5)：72-78,7.DOI:10.3969/j.issn.1673-5005.2016.05.008
热孔弹塑性完全耦合作用下的井底岩石应力分布
A coupled thermo and poro-elastoplasticity analysis of stress distribution in bottom-hole rocks during drilling
摘要
Abstract
The stress distribution in bottom-hole rocks plays a key role on drilling efficiency. In this study, a fully coupled numerical simulation model was established, and the effects of overburden pressure, horizontal in-situ stresses, drilling fluid pressure, pore pressure and temperature on the stress distribution in bottom-hole rocks were investigated. The simulation re-sults show that the maximum principle stress of the bottom-hole rock increases with the increasing of drilling fluid pressure, well depth and temperature difference, and it firstly increases and then decreases with the decrease of the permeability coeffi-cient of the rock formation. In the axial direction of the well and under the bottom-hole surface, the maximum principle stress of the rocks decreases with the increase of drilling fluid pressure and well depth, while the temperature difference has little influence on it when the distance from the bottom hole surface reaches a certain value.关键词
热孔弹塑性/井底应力/完全耦合/数值解/破碎机制Key words
thermo and poro-elastoplasticity/bottom-hole rock stress/fully coupled/numerical solution/fragmentation mechanism分类
能源科技引用本文复制引用
祝效华,刘伟吉..热孔弹塑性完全耦合作用下的井底岩石应力分布[J].中国石油大学学报（自然科学版）,2016,40(5):72-78,7.基金项目
国家自然科学基金项目(51222406,51674214) （51222406,51674214）
四川省科技计划国际合作项目(2016HH0008) （2016HH0008）
四川省青年科技创新研究团队项目(2014TD0025) （2014TD0025）
