A high percentage of oil and gas wells drilled throughout the world have been completed using perforated casing. In older cased-hole wells, the production pressure may be depleted and/or hydrocarbon flow may be impeded by various damaging mechanisms such as in-situ emulsions, water blockage, solids migration, asphaltenes and paraffin deposition. In newer wells, drilled using oil- or synthetic-based drilling fluids, emulsion blockage may cause near-wellbore damage when the filtrate or whole mud interacts with formation fluids or completion brine.

Properties of microemulsions, such as high oil solubilization rates and ultra-low interfacial tension make this type of fluid ideal for addressing all of the described problems in old and new cased-hole wells.

This paper presents development procedures and case history results from numerous field applications that demonstrate the efficiency to reduce skin damage and improve productivity by using a single-phase microemulsion fluid specially designed for cased-hole wells.

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