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The article presents a case history of the first successful application of drilling and completion in a high-rate gas field located offshore of Trinidad. The application uses a reversible oil-based (OB) reservoir-drilling fluid (RDF) and an OB gravel-packing fluid. It also presents the drilling and completion methodology that is based from extensive laboratory and yard testing, and a direct comparison of the all-oil drilling and completion process to water-based drilling and completion.