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Billionaire oilman Harold Hamm, chairman of Oklahoma City-based Continental Resources Inc., delivers his speech, "Rock Steady in the Bakken", Thursday, May 22, 2014 during the 22nd Williston Basin Petroleum Conference held in Bismarck, N.D. (AP PhotoKevin Cederstrom)

Billionaire oilman Harold Hamm, chairman of Oklahoma City-based Continental Resources Inc., delivers his speech, "Rock Steady in the Bakken", Thursday, May 22, 2014 during the 22nd Williston Basin Petroleum Conference held in Bismarck, N.D. (AP PhotoKevin Cederstrom)

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