Oil exploration; gas exploration; technology research in the field of well drilling and oil and gas exploration and production; oil well testing; performing oil well diagnostics

'diagnost':26 'drill':12 'explor':2,4,17 'field':9 'gas':3,16 'oil':1,14,20,24 'perform':23 'product':19 'research':6 'technolog':5 'test':22 'well':11,21,25

Drilling for, pumping and extraction of crude oil and natural gas; construction of structures for the production of crude oil and natural gas

'construct':12 'crude':7,19 'drill':1 'extract':5 'gas':11,23 'natur':10,22 'oil':8,20 'product':17 'pump':3 'structur':14

Production of crude oil and natural gas; processing of natural gas and natural gas liquids

'crude':3 'gas':7,11,14 'liquid':15 'natur':6,10,13 'oil':4 'process':8 'product':1

Distribution of energy in the form of natural gas to public utilities, electric power producers, natural gas processors, pipeline companies, marketing intermediaries, and large industrial concerns; and crude oil distribution

'compani':20 'concern':26 'crude':28 'distribut':1,30 'electr':13 'energi':3 'form':6 'gas':9,17 'industri':25 'intermediari':22 'larg':24 'market':21 'natur':8,16 'oil':29 'pipelin':19 'power':14 'processor':18 'produc':15 'public':11 'util':12

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