Chemical for use as a fluid loss additive employed to minimize fluid losses in subterranean formations; chemical agents for use in treatment, servicing, and working of oil wells and gas wells, namely, subterranean formation filling agents, proppants and abrasive agents for subterranean formations

'abras':39 'addit':8 'agent':18,36,40 'chemic':1,17 'employ':9 'fill':35 'fluid':6,12 'format':16,34,43 'gas':30 'loss':7,13 'minim':11 'name':32 'oil':27 'proppant':37 'servic':23 'subterranean':15,33,42 'treatment':22 'use':3,20 'well':28,31 'work':25

Ceramic materials for use in the oil well and gas well industry, namely, ceramic pellets, shots, and spheres for use in oil well and gas well hydraulic fracturing, and as gravel pack materials for sand control operation, and for use as strengthening agents for subterranean formations

'agent':43 'ceram':1,14 'control':36 'format':46 'fractur':28 'gas':10,25 'gravel':31 'hydraul':27 'industri':12 'materi':2,33 'name':13 'oil':7,22 'oper':37 'pack':32 'pellet':15 'sand':35 'shot':16 'sphere':18 'strengthen':42 'subterranean':45 'use':4,20,40 'well':8,11,23,26

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