Challenge: These wells needed the maximum hole stability of an invert-emulsion fluid for drilling an 8¾-in. interval through the water-sensitive Charles and Kibby Lime formations. Additionally, losses had to be minimized while drilling the Mission Canyon formation, chiefly through precise control of Equivalent Circulating Densities (ECDs) prior to setting 7-in. casing. The lateral section would then be drilled with brine through the Bakken Shale.
Solution: The MEGADRIL system has proven to be the fluid of choice on the continued Bakken-shale development for a major operator in the Williston Basin. The MEGADRIL system, using a one-drum emulsifier package, MEGADRIL, continues to provide a flat rheology along with reduced gel strengths and low plastic viscosities and yield point. The system delivers excellent Rates of Penetration (ROP), allowing maximum hole cleaning and reduced ECD. The system was run with an Oil-to-Water Ratio (OWR) of 75:25 instead of the traditional 80:20, reducing the use of diesel base oil while maintaining an excellent rheological profile.
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