A worker for an oilfield service company works at a drilling site in the Permian Basin oil field in the oil town of Andrews, Texas, Jan. 20, 2016.

Oil and gas price hedges helped many exploration and production companies keep money coming in the door as commodity prices cratered last year, but they have significantly less protection in 2016.

North American oil and gas producers have just 15 percent of output hedged this year, according to a study of 51 drillers by analytics firm IHS.