A federal agency has cited three companies in a natural gas rig explosion in Oklahoma that killed five workers.      The Occupational Safety and Health Administration announced that it’s fined Patterson-UTI Drilling, Crescent Consulting LLC and Skyline Directional Drilling LLC a total of $118,000 for “exposing employees to fire and explosion hazards” in the January 22 explosion near Quinton, about 100 miles southeast of Tulsa.    &…