drilling for crude oil or natural gas; extraction and pumping of crude oil, natural gas and natural gas liquids from subterranean formations

'crude':3,12 'drill':1 'extract':8 'format':22 'gas':7,15,18 'liquid':19 'natur':6,14,17 'oil':4,13 'pump':10 'subterranean':21

storage and transmission by pipeline of natural gas liquids

'gas':8 'liquid':9 'natur':7 'pipelin':5 'storag':1 'transmiss':3

prospecting for oil and gas; consulting services in the field of prospecting for oil and gas

'consult':6 'field':10 'gas':5,16 'oil':3,14 'prospect':1,12 'servic':7

crude oil, natural gas, natural gas liquids and synthetic oils made by treatment of oil sands and tar sands

'crude':1 'gas':4,6 'liquid':7 'made':11 'natur':3,5 'oil':2,10,15 'sand':16,19 'synthet':9 'tar':18 'treatment':13

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