摘要
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.
出处
《断块油气田》
CAS
2007年第5期56-58,共3页
Fault-Block Oil & Gas Field
基金
四川省高校重点实验室基金项目(2006ZD46)资助
关键词
井壁稳定
裂缝
应力强度因子
断裂力学
有限元
borehole wall stability,crack,stress intensity factor,fracture mechanics,finite element method.
