After a successful exploration phase, an opportunity to develop the Guyana Suriname Basin came to fruition. The drilling and completion campaign scope included planned gas-injector wells that required a breaker application for matrix injection. A reversible nonaqueous reservoir drill-in fluid (RDIF) system using a calcium bromide brine as the internal phase and formulated at a 50/50 oil/water ratio (OWR) was selected. The complete paper discusses the results of extensive laboratory tests for the selection, customization of both the RDIF and the delayed breaker, and the field performance of the two fluids.

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