裂缝井壁力学稳定性研究

Study on stability of fractured borehole wall

 朱荣东 陈平 夏宏泉 范翔宇

 西南石油大学石油工程测井实验室，四川成都610500

 (Petroleum Engineering Logging
Laboratory,Southwest Petroleum University, Chengdu
610500, China)

 针对钻井过程中的井壁失稳问题，探讨了裂缝井壁失稳机理，主要考虑了井壁裂
缝尖端的应力强度因子，采用有限元法和孔隙弹性理论研究自然裂缝地层中的井眼行为，分析
裂缝井壁的稳定性。同时研究了不同参数对裂缝扩张和井壁稳定的影响，为正确认识裂缝井眼
的稳定性提供了科学依据。

This paper discussed the instability mechanism of
borehole wall with cracks,mainly considered the stress
intensity factors of crack tip. The wellbore behavior in fractal
formation in this paper is analyzed by using finite element
method and poroelastic theories,studying them to analysis the
stability of wellbore wall with cracks. At the same time, we
studied that the different parameters how to affect the crack
extending and wellbore stability. Thus this paper offered the
scientific foundation for correct understanding stability of
wellbore wall with cracks.