The well damage history in the fields operated by BP Colombia has showed an interesting performance in all producer and injector wells. The abnormal productivity decline detected since the start-up in 1991 was a clear evidence of the skin damage magnitude, in fact, the fields have not plateau history. The initial high oil and gas rates production added to strong geological structures in which a variety of fluids have been producing (critical volatile and gas condensate) have contributed to the development of a very complex damage scenario; main damage factors identified at early stage of production were fines migration and mineral scales (calcite, siderite, barite, celestite and iron compounds). Research regarding acid stimulation and mineral scale inhibition was the first step trying to mitigate the high oil rate decline. New damage mechanisms were detected as long as the fields were in production, water and condensate blockage, organic scales (wax and asphaltenes), iron sulfide scales, and wettablity changes were the main damage mechanisms detected. Engineering work, laboratory and geological studies, backflow analysis, third parties investigation and an extensive field trial program have been developed to determine the best stimulation program that should be applied in each one of producer/injector wells. Although high success removing formation damage has been obtained, it has been necessary to focus additional effort to find and test new technology addressed to increase both IIOR and stimulation lifetime.

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