The impact of drilling unloading on wellbore stability of shale formations
X Liu¹, Y Ding¹, P Luo¹, L Liang¹ - 2018 - searchanddiscovery.com
It is easy for wellbores to lose stability during drilling through shale formations where
induced fractures and cracks might be generated due to drilling unloading in rocks around
the wellbore and the consequent reduces rock strength which thereby can cause wellbore
instability. To ensure consistent wellbore stability while drilling through shale, the author
simulated stress change process during drilling unloading with a triaxial testing system to
analyze the impact of unloading on shale mechanical properties. Further, the relationship …
induced fractures and cracks might be generated due to drilling unloading in rocks around
the wellbore and the consequent reduces rock strength which thereby can cause wellbore
instability. To ensure consistent wellbore stability while drilling through shale, the author
simulated stress change process during drilling unloading with a triaxial testing system to
analyze the impact of unloading on shale mechanical properties. Further, the relationship …
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