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- Service activities incidental to oil and gas extraction excluding surveying [ This class includes oil and gas field service activities provided on a fee or contract basis, including: directional drilling; ?spudding in?; derrick building; repairing and dismantling; cementing oil and gas well casings; pumping wells; and other service activities. Oil and gas field exploration and geo-physical, geological and seismic surveying are classified in class 7421(Architectural and engineering activities and related technical consultancy)] (3)
- Extraction of crude petroleum and natural gas [including liquefaction/ regasification of natural gas for purposes of transport and the production, at the mining site, of hydrocarbons from oil or gas field gases ] (2)