Well design in the Williston Basin has changed significantly since the first horizontal wells in North Dakota and Montana. These wells typically targeted the middle Bakken using very short lateral lengths, a handful of stages and very little water and proppant. Operators have found they can use laterals in excess of 10000 feet with up to 40 stages. These wells now used 100000 barrels of water and up to 9 million pounds of proppant.
Improvements have decreased depletion rates, and increased EURs. Decreased depletion will increase the cumulative production derived from fracking. If this is the case, current models may be too conservative.When looking at Williston Basin production, it is important to remember this is a stacked play.But that's all you can find of the story unless you have a subscription to the second link.