FILE - This Tuesday, Aug. 25, 2009 file photo shows capped wells in the foreground as Anadarko Petroleum Corp., uses a walking rig to drill a series of wells on a pad on a Weld County farm near Mead, Colo. In the past, when rigs were finished drilling a well, they had to be disassembled and trucked to the next location, a process that took several days. Now some rigs can “walk” hundreds of feet on hydraulic shoes to the next drilling spot. This reduces drilling costs. (AP Photo/Ed Andrieski, File)

Associated Press
FILE - This Tuesday, Aug. 25, 2009 file photo shows capped wells in the foreground as Anadarko Petroleum Corp., uses a walking rig to drill a series of wells on a pad on a Weld County farm near Mead, Colo. In the past, when rigs were finished drilling a well, they had to be disassembled and trucked to the next location, a process that took several days. Now some rigs can “walk” hundreds of feet on hydraulic shoes to the next drilling spot. This reduces drilling costs. (AP Photo/Ed Andrieski, File)
FILE - This Tuesday, Aug. 25, 2009 file photo shows capped wells in the foreground as Anadarko Petroleum Corp., uses a walking rig to drill a series of wells on a pad on a Weld County farm near Mead, Colo. In the past, when rigs were finished drilling a well, they had to be disassembled and trucked to the next location, a process that took several days. Now some rigs can “walk” hundreds of feet on hydraulic shoes to the next drilling spot. This reduces drilling costs. (AP Photo/Ed Andrieski, File)
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