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| well number | well depth, m | causes of well wall instability | time-consuming to deal with wellbore instability |
|---|---|---|---|
| Hasan 2 | 2037 | drop block stuck drill | 1287 h |
| 5173.5 | drop block stuck drill | 48 h | |
| 5238.26 | drop block stuck drill | 195.5 h | |
| Hasan 3 | 3828.12 | drop block stuck drill | 137 h |
| Hasan slant 1 | 2215 | drop block | 3 d |
