Oil and gas well completion and workover chemicals, namely, water soluble chemicals for establishing a certain buffered pH in waters, aqueous solutions, and oilfield brines, used particularly in aqueous solutions or bine solutions containing hydroxy ethyl cellulose

'aqueous':21,29 'bine':32 'brine':25 'buffer':17 'cellulos':37 'certain':16 'chemic':8,12 'complet':5 'contain':34 'establish':14 'ethyl':36 'gas':3 'hydroxi':35 'name':9 'oil':1 'oilfield':24 'particular':27 'ph':18 'solubl':11 'solut':22,30,33 'use':26 'water':10,20 'well':4 'workov':7

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