As they reshape markets for natural gas in North America, shale plays also are changing research priorities and business relationships.Shale gas, said Jonathan Lewis, senior vice-president of Halliburton's drilling and evaluation division, is "fundamentally changing the energy landscape in North America and is doing so with unprecedented speed."Citing the surging share of North American gas supply coming from shales, Lewis told the RMI Oilfield Breakfast Forum that reservoirs once considered unconventional now attract enough activity, such as horizontal drilling and fracturing, to be considered conventional.He acknowledged that the new supplies, combined with growing volumes of ...