In this Nov. 6, 2013, file photo, a Whiting Petroleum Co. pump jack pulls crude oil from the Bakken region of the Northern Plains near Bainville, Mont.
In this Nov. 6, 2013, file photo, a Whiting Petroleum Co. pump jack pulls crude oil from the Bakken region of the Northern Plains near Bainville, Mont. Matthew Brown AP
In this Nov. 6, 2013, file photo, a Whiting Petroleum Co. pump jack pulls crude oil from the Bakken region of the Northern Plains near Bainville, Mont. Matthew Brown AP