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SPE.org 

Two places that illustrate the mounting challenges facing the shale business are the Bakken Shale in North Dakota, where the number of working rigs is one-third what it was a year ago, and the Fayetteville Shale in Arkansas, where there are no more working rigs. An analysis of thousands of fracturing treatments in major plays in the United States provides insights into how fracture designs have changed over time.