Research Article

Modelling of Time-Dependent Wellbore Collapse in Hard Brittle Shale Formation under Underbalanced Drilling Condition

Table 2

Relative content of clay minerals.

WellRelative content (%)Interlayer ratio (%)
Illite (I)Montmorillonite (S)Illite/montmorillonite (I/S)Kaolinite (K)Chlorite (C)

W-8149.780.0012.636.2731.3315.00
W-8256.540.006.720.0036.7410.00
W-9634.470.0039.7410.6215.1725.00