prospecting for oil and gas; oil field and gas exploration; analysis for oil-field exploration; oil-field surveys; oil-well testing; gas fields testing; chemical and technical research in the fields of oil and gas; professional consultancy in the fields of oil and gas field exploration

'analysi':11 'chemic':28 'consult':40 'explor':10,16,49 'field':7,15,19,26,34,43,48 'gas':5,9,25,38,47 'oil':3,6,14,18,22,36,45 'oil-field':13,17 'oil-wel':21 'profession':39 'prospect':1 'research':31 'survey':20 'technic':30 'test':24,27 'well':23

drilling of wells; installation, cleaning, maintenance and repair of drilling rigs and equipment; pipeline construction and maintenance; vehicle service stations, namely, refueling and maintenance

'clean':5 'construct':15 'drill':1,10 'equip':13 'instal':4 'mainten':6,17,24 'name':21 'pipelin':14 'refuel':22 'repair':8 'rig':11 'servic':19 'station':20 'vehicl':18 'well':3

B

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