CHEMICALS FOR USE IN INDUSTRY, NAMELY, CHEMICALS AND CHEMICAL SUBSTANCES ALL FOR USE IN THE PETROLEUM INDUSTRY; CHEMICALS AND CHEMICAL SUBSTANCES, PREPARATIONS AND COMPOSITIONS ALL FOR USE IN OIL, GAS AND WATER DRILLING AND EXPLORATION OPERATIONS; CHEMICALS AND CHEMICAL SUBSTANCES, PREPARATION AND COMPOSITIONS ALL FOR USE IN OIL, GAS AND WATER DRILLING COMPLETION AND WORKOVER; CHEMICALS AND CHEMICAL SUBSTANCES, PREPARATIONS AND COMPOSITIONS FOR USE IN OIL, GAS AND WATER DRILLING AND CEMENTING PROCEDURES, STIMULATION, NAMELY, ACIDIZING AND FRACTURING; CHEMICALS AND CHEMICAL SUBSTANCES, PREPARATIONS AND COMPOSITIONS FOR USE IN OIL AND GAS PRODUCTION, TRANSPORTATION AND REFINING

'acid':76 'cement':72 'chemic':1,7,9,18,20,37,39,56,58,79,81 'complet':53 'composit':24,43,62,85 'drill':33,52,70 'explor':35 'fractur':78 'gas':30,49,67,91 'industri':5,17 'name':6,75 'oil':29,48,66,89 'oper':36 'petroleum':16 'prepar':22,41,60,83 'procedur':73 'product':92 'refin':95 'stimul':74 'substanc':10,21,40,59,82 'transport':93 'use':3,13,27,46,64,87 'water':32,51,69 'workov':55

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