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Geofluids
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2019
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Article
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Tab 4
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Research Article
Modelling of Time-Dependent Wellbore Collapse in Hard Brittle Shale Formation under Underbalanced Drilling Condition
Table 4
Pressure tests of the Shahejie Formation.
Layer
Formation pressure coefficient
Collapse pressure coefficient
Fracture pressure coefficient
Es1
1.31
1.32
1.8
Es2, Es3
1.30
1.33
1.93