Crude petroleum and natural gas production

This sub-class includes extraction, exploration, dressing and/or beneficiating of crude petroleum and natural gas. Units in this sub-class are primarily engaged in: - extraction and/or exploration of crude petroleum oils, gaseous hydrocarbon (natural gas) and/or condensates - draining and/or separation of liquid hydrocarbon fractions - gas desulphurisation - extraction and/or exploration of bituminous or oil shale and/or tar sand - production of crude petroleum from bituminous shale and/or sand - processes to obtain crude oils such as decantation, desalting, dehydration and/or stabilisation - mining of hydrocarbon liquid, obtained through liquefaction or pyrolysis