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Study on stability of fractured borehole wall

Zhu Rongdong(Petroleum Engineering Logging Laboratory,Southwest Petroleum University,Chengdu 610500,China),Chen Ping,Xia Hongquan,et al.  
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.
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