Chemicals for use in industry; chemical additives for use in oil field technology; polymers for use in oil-well servicing fluids, including drilling fluids; chemical fluid loss additives for drilling fluids such as used in hydrocarbon recovery; chemicals for use as cement additives; chemical preparations for use as corrosion inhibitors

'addit':7,29,44 'cement':43 'chemic':1,6,26,39,45 'corros':50 'drill':24,31 'field':12 'fluid':22,25,27,32 'hydrocarbon':37 'includ':23 'industri':5 'inhibitor':51 'loss':28 'oil':11,19 'oil-wel':18 'polym':14 'prepar':46 'recoveri':38 'servic':21 'technolog':13 'use':3,9,16,35,41,48 'well':20

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