Geological surveys or research; consultancy in the field of surveys or research of oil or natural gas; investigation, analysis, experiment or research of oil or natural gas; engineering of oil or natural gas plants

'analysi':19 'consult':5 'engin':28 'experi':20 'field':8 'gas':17,27,33 'geolog':1 'investig':18 'natur':16,26,32 'oil':14,24,30 'plant':34 'research':4,12,22 'survey':2,10

Transport of crude oil, gas and oil refined products by pipelines; transport of crude oil, gas by vessels; transport of crude oil, gas by railways; transport of crude oil, gas by vehicles; gas supplying; storage service of crude oil, gas and oil refined products by tank

'crude':3,14,21,28,38 'gas':5,16,23,30,33,40 'oil':4,7,15,22,29,39,42 'pipelin':11 'product':9,44 'railway':25 'refin':8,43 'servic':36 'storag':35 'suppli':34 'tank':46 'transport':1,12,19,26 'vehicl':32 'vessel':18

Excavating work of natural resources, such as oil and gas; drilling of wells; installation of oil pipelines for oil and natural gas

'drill':11 'excav':1 'gas':10,22 'instal':14 'natur':4,21 'oil':8,16,19 'pipelin':17 'resourc':5 'well':13 'work':2

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