Get your copy of "Gel Systems Improved Oil Production in Old Fractured Carbonate Well"
An openhole producer in the Ellenburger formation in Reagan County, Texas, had reached uneconomic levels, producing 9 BOPD/2,200 BWPD. The Ellenburger formation is a naturally fractured carbonate formation, a type that often produces excessive water because of underlying aquifers with strong water drives. It typically has many secondary porosity features such as fractures and vugs. Because the viscosity of oil is higher than that of water, water tends to bypass the oil and flow out through these fractures and vugs, leaving behind large reserves of oil.