The product increases the carrying capacity and suspension properties of invert-emulsion fluids, allowing weighting agents and cuttings to be reliably held in suspension and thereby improving cleaning of the wellbore and near-wellbore zone. Owing to its ability to form a strong gel with high low-shear-rate viscosity, CP-1 improves cuttings transport efficiency, promotes the formation of a high-quality filter cake and reduces drilling fluid filtration into the productive formation