These observations informed the extensive chemical analysis, development and final design of a proprietary reservoir drilling fluid (Melbana RDF) to mitigate the risk of formation damage in future drilling operations. Following development, Melbana RDF was subject to extensive fluid and rock compatibility testing, which confirmed its suitability and compatibility with the primary Unit 1B reservoir. Melbana RDF is a water-based drilling fluid that is designed to minimise the risk of formation damage whilst maintaining the ability to safely and effectively drill the well. The use of RDF is not uncommon for formations susceptible to drilling induced damage but none had previously been developed for use in Cuba (See Figure 3). Figure 3 – Melbana RDF (Sample 14, LHS) was designed to maximise production well flows by minimising the risk of formation from crystallisation of precipitates, excessive barite and emulsion formation Figure 2 – Evidence of formation damage 13 Melbana Energy Limited Annual Report 2025
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