Proppants for hydraulic fracturing, namely, ceramic proppants, sand proppants, and porous proppants; chemicals for well drilling and cementation, namely, bentonite, barite, cenosphere, polyanionic cellulose, carboxy methylated cellulose, and silica fume

'barit':21 'bentonit':20 'carboxi':25 'cellulos':24,27 'cement':18 'cenospher':22 'ceram':6 'chemic':13 'drill':16 'fractur':4 'fume':30 'hydraul':3 'methyl':26 'name':5,19 'polyanion':23 'porous':11 'proppant':1,7,9,12 'sand':8 'silica':29 'well':15

Metal equipment and metal parts for well production, namely, flexible pipes, oil casing used to stabilize the wellbore in oil and gas wells and oil pipes, valves, other than parts of machines and sealing rings

'case':13 'equip':2 'flexibl':10 'gas':22 'machin':32 'metal':1,4 'name':9 'oil':12,20,25 'part':5,30 'pipe':11,26 'product':8 'ring':35 'seal':34 'stabil':16 'use':14 'valv':27 'well':7,23 'wellbor':18

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