Focus: Unconventional Oil & Gas — Sliding-sleeve fracs unlock more ND Bakken oil

Paula DittrickSenior Staff WriterProduction results for the Bakken formation in the Williston basin continue to improve with technological advances, prompting Continental Resources Inc. to estimate potentially recoverable reserves of 24 billion boe.Continental’s estimate dwarfs the US Geological Survey’s 2008 most likely estimate of 4.3 billion bbl of undiscovered technically recoverable oil in the Bakken play.The difference between the estimates is that recoveries on a per-well basis have increased substantially since June 2007, which was the cutoff for wells in the USGS analysis, Continental said.The North Dakota Industrial Commission in January announced recoverable reserve...

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