ESTER-BASED MUDS SHOW PROMISE FOR REPLACING SOME OIL-BASED MUDS

Patrick Kenny Statoil Stavanger, Norway The use of ester-based mud systems, instead of oil-based mud, helped drill difficult shales and high-angle well sections, including one of the world's longest extended reach wells. Statoil has successfully used ester-based muds on ten wells during a 3-yr period. Although the results from the ester-based muds were satisfactory, Statoil continues to study other mud systems as alternatives to oil-based muds.

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