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ABSTRACT
A field study of anhydride-based chemical additive for carbonate scale control in oilfield produced waters has been carried out at Nigerian Obama and Tebidaba flow stations.
Results of the study revealed that the additive brought down considerably the precipitation indices and hence the scaling tendencies of Obama and Tebidaba waters. It also caused a remarkable reduction in the total suspended solids, TSS and total dissolved solids, TDS concentration of these waters at ultra low injection concentration (< < 0.5 ppm), thus re-affirming its unique dual role capability for inhibiting the process of scale formation and promoting dissolution of existing scales' suspension in the produced water. Similar dual-role capability has not been reported for any carbonate scale control system.