well-fracturing preparations, namely, fluids for injection into gas and oil wells to spilt rock by means of hydraulic pressure

'fluid':6 'fractur':3 'gas':10 'hydraul':20 'inject':8 'mean':18 'name':5 'oil':12 'prepar':4 'pressur':21 'rock':16 'spilt':15 'well':2,13 'well-fractur':1

oil and gas well fracturing and acidizing stimulation services

'acid':7 'fractur':5 'gas':3 'oil':1 'servic':9 'stimul':8 'well':4

oil and gas well cementing and coil tubing services

'cement':5 'coil':7 'gas':3 'oil':1 'servic':9 'tube':8 'well':4

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