This U.S. industry comprises establishments primarily engaged in performing support activities on a contract or fee basis for oil and gas operations (except site preparation and related construction activities). Services included are exploration (except geophysical surveying and mapping); excavating slush pits and cellars, well surveying; running, cutting, and pulling casings, tubes, and rods; cementing wells, shooting wells; perforating well casings; acidizing and chemically treating wells; and cleaning out, bailing, and swabbing wells. Contract drilling for oil and gas--are classified in U.S. Industry 213111, Drilling Oil and Gas Wells; Operating oil and gas field properties on a contract or fee basis--are classified in Subsector 211, Oil and Gas Extraction, based on the activity; Performing geophysical surveying and mapping services for oil and gas on a contract or fee basis--are classified in Industry 541360, Geophysical Surveying and Mapping Services; Oil and gas pipeline and related structures construction--are classified in Industry 237120, Oil and Gas Pipeline and Related Structures Construction; and Site preparation and related construction activities on a contract or fee basis--are classified in Industry 238910, Site Preparation Contractors.
