Support services for oil and natural gas extraction

This subclass includes support services provided on a fee or contract basis to oil and gas extraction: - exploration services related to oil and gas extraction, conventional geological work to search for new deposits - directional drilling and over-drilling, back-and-forth drilling, installation, repair and removal of drilling rigs, cementing of oil and gas wells, casings, well filling, plugging, etc. - liquefaction of natural gas for transportation on the field and conversion of liquefied gas into natural gas - drainage, water extraction services on a fee or contract basis - exploratory drilling for gas and oil extraction - firefighting services on the field. Excludes: - services provided by an oil and gas operator on a fee or contract basis, see 06.10, 06.20 - specialised repair of mining machinery, see 33.12 - liquefaction of natural gas for off-site transportation and conversion of liquefied gas into natural gas, see 52.21 - geophysical, geological and seismic exploration activities, see 71.12