Oneok Partners, an Oklahoma gas-processing company, is planning a pipeline that could cost up to $550 million to channel gas liquids, including propane and butane, from North Dakota's oilfields. The proposed pipeline would stretch about 525 miles to Wyoming, where it would join an existing NGL line that goes to Conway, Kan. The pipeline would be 12 inches across and transport as much as 60,000 barrels a day of gas liquids.

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