Article Photos: Back to the Future: Chaparral hopes to recover 77 million barrels of oil from one of Oklahoma's oldest oil fields 3/10

Crewmembers work to install compressors at Chaparral Energy's North Burbank field in Osage County. The facility takes carbon dioxide recovered from producing wells, compresses it before it is reinjected into the rock layers underground. <strong>photo by Adam Wilmoth</strong>