Energy companies are missing out on extracting 95% of shale oil reserves, as traditional drilling techniques run short in increasing their recovery rates, Robert Kleinberg, a scientist at oilfield services firm Schlumberger, said at a conference last week. He noted that these methods, including water flooding and steam injection, used in conventional drilling are not applicable to drilling in tight plays. Refracking could work to boost rates, but considering the limitations and expenses, "the current strategy generally is to go and drill a new well somewhere else," Kleinberg said.

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