Shares of energy companies were more or less flat on a volatile trading session, as a dramatic bounce for natural gas prices continued.

Natural-gas futures rose 5.8% to $2.25 a million British thermal units, completing their largest two-session gain since November 2018, amid reports that the gas-processing infrastructure on the Gulf of Mexico coast was badly snarled by recent hurricane activity.

Noble Corp., an operator of offshore oil-and-gas drilling rigs, has settled multibillion-dollar litigation over its 2014 spinoff of Paragon Offshore, a critical step in Noble's path to exiting bankruptcy.

Write to Rob Curran at rob.curran@dowjones.com