Tulsa-based WPX now believes its 100,000 acres in the Delaware sub-basin of the Permian could hold more than 2.4 billion barrels of oil equivalent and 5500 drilling locations, up from a resource estimate of 1.1 billion barrels and 3600 drilling locations just a year ago.

“The Delaware is a world-class oil play, whose upside is being understood more and more through ongoing resource assessment,” chief operating officer Clay Gaspar said.