211111 - Crude Petroleum and Natural Gas Extraction US
This U.S. industry comprises establishments primarily engaged in (1) the exploration, development and/or the production of petroleum or natural gas from wells in which the hydrocarbons will initially flow or can be produced using normal pumping techniques or (2) the production of crude petroleum from surface shales or tar sands or from reservoirs in which the hydrocarbons are semisolids. Establishments in this industry operate oil and gas wells on their own account or for others on a contract or fee basis. Cross-References. Establishments primarily engaged in-- ? Performing oil field services for operators on a contract or fee basis--are classified in Industry 21311, Support Activities for Mining; ? Refining crude petroleum into refined petroleum and liquid hydrocarbons--are classified in Industry 324110, Petroleum Refineries; and ? Recovering helium from natural gas--are classified in Industry 325120, Industrial Gas Manufacturing.