The deal will see Bristol Bay acquire full ownership of Peak, which specialises in rig moving, custom heavy hauling, crane and rigging services and oilfield transportation.
Peak primarily serves customers in the Alaska North Slope, Cook Inlet, Valdez and North Dakota regions.
No financial details were disclosed, but Nabors chief executive Anthony Petrello said the deal would "more than cover the approximate $207 million premium paid to refinance $785 million of higher-cost debt" through a recent tender offer.
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