drilling of deep oil or gas-wells; extraction of natural gas; oil and gas drilling; oil pumping and extraction; extraction of oil, gas and natural gas

'deep':3 'drill':1,16 'extract':9,20,21 'gas':7,12,15,24,27 'gas-wel':6 'natur':11,26 'oil':4,13,17,23 'pump':18 'well':8

oil and gas well treatment; production of energy; generation of energy; generation of power through operation of power generation equipment and facilities

'energi':8,11 'equip':20 'facil':22 'gas':3 'generat':9,12,19 'oil':1 'oper':16 'power':14,18 'product':6 'treatment':5 'well':4

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