Table 1
Data for well A1 used in the study.
| σv = 22.621 kPa/m | φ=32° |
| σH = 19.228 kPa/m | Z = 1524 m |
| σh = 18.096 kPa/m | aw,shale = 0.8 |
| po = 10.179 kPa/m | aw,mud = 0.8 |
| c = 4826.33 kPa | θ = N0E |
| μ = 0.28 | Zw = 152.4 m |
Figure 1
Effect of water depth on the critical mud weight
Figure 2
Variation of wellbore collapse within the formation due to the column of water
Figure 3
Effect of mud chemical activity on the critical mud weight
Figure 4
Effect of mud chemical activity on the collapse gradient for different shale chemical activities.