Formation damage traced to contaminated completion fluids

08/12/2002
Extensive compatibility tests determined the severity of the problem and developed preventive and remedial measures to deal with organic sludges that choked hydraulic fractures and the critical matrix in the producing reservoirs of the LL-652 oil field, in Venezuela.Organic sludges form when iron-contaminated completion brines are lost to the formation. Although this was believed to be the primary cause of the problem, other plausible damage mechanisms include dehydrated polymer gel damage in proppant packs, fines migration, and water blocks.LL-652 oil fieldChevronTexaco Overseas Petroleum Co. operates LL-652 oil field, in central-northeast Lake Maracaibo, Venezuela, under a 20-year opera...
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