摘要
本文将岩石视为多孔介质，考虑渗流作用，应用弹塑性理论和损伤力学，导出了井壁围岩的应力分布规律，并应用动力判别准则提出了力学意义上严格的井壁稳定条件，给出了渗流作用下井壁稳定的孔隙压力的临界值。提出当井壁孔隙压力接近临界值时，井壁处于非稳定平衡状态，在有动力扰动的情况下，井壁因失稳而坍塌。
As a porous medium, rocks have permeation effects. Elastic-plastic theory and damage mechanics are used to obtain the stress distribution of rocks around wellbore. With dynamic discriminant, strict stable conditions for wellbore are put forward, and critical stress values of wellbore are acquired take into account the permeable effect. When the stress of wellbore is close to critical loads, wellbore is in the state of instability, and when dynamic disturbance is present, wellbore will collapse because of instability.
出处
《工程力学》
EI
CSCD
北大核心
2002年第3期105-108,共4页
Engineering Mechanics
关键词
油井井壁
稳定性
渗流
临界载荷
应力分布
wellbore stability
permeation
critical load
damage
analysis
