For casing set depth:
MW max is limited by prior casing shoe fracture pressure (minus kick margin).
MW min is limited by BHP (plus trip margin).
In this problem:
3,000 psi = 0.052(MWmax)4,000 ft
...so MW max = 14.4 ppg
6,000 psi = 0.052(MWmax)9,000 ft
...so MW max = 12.8 + 0.2 = 13.0 ppg
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