The late-2014, Saudi-initiated oil-price war may have taken the ‘boom’ out of the US shale industry as it seriously threatened OPEC market share, but Saudi victory has been elusive: US shale has proven amazingly resilient. The industry has adapted quickly to the new playing field, and the unsung hero of a new uptick in drilling and investment isn’t just true grit—it’s sand.
http://oilprice.com/Energy/Energy-General/Frack-Sand-The-Unsung-Hero-Of-The-OPEC-Oil-War.html