Case History A major operator drilling an unconventional oil well in the Bakken shale ran two plug- and-perf completions. After drilling the deviated horizontal wellbores, the operator ran 4½ in.,11.6 lb casing to depth. Next, the operator set 43 composite frac plugs in one 9,500 ft (2896 m) horizontal wellbore and 36 in the second wellbore, and then successfully fractured each zone. To bring the well on line, the operator needed to mill

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