Novel emulsifiers in reversible invert emulsion drilling fluids offer a unique opportunity for operators to control the wettability properties of the mud. Reversibility of the invert emulsion will provide economic advantages in drilling and completion and increased productivity. Optimal drilling performance and formation damage control are usually achievable by oil wetting the drill solids, formation and drillstring. On the other hand, optimal completion of a well - filtercake removal and cement bonding - and disposal of drilled cuttings are best achieved by maintaining all surfaces water-wet. Filtercake removal is especially critical in the completion of horizontal openhole wells.
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