SIC Code 13 – Oil and Gas Extraction
This major group includes establishments primarily engaged in:
(1) producing crude petroleum and natural gas
(2) extracting oil from oil sands and oil shale
(3) producing natural gasoline and cycle condensate
(4) producing gas and hydrocarbon liquids from coal at the mine site
Types of activities included are exploration, drilling, oil and gas well operation and maintenance, the operation of natural gasoline and cycle plants, and the gasification, liquefaction, and pyrolysis of coal at the mine site. This major group also includes such basic activities as emulsion breaking and desilting of crude petroleum in the preparation of oil and gas customarily done at the field site.