DRILLING FLUID USING SURFACTANT PACKAGE

摘要

A drilling fluid, comprising an aqueous continuous phase, and a surfactant system comprising a mixture of an ester phosphate and a non-ionic ethoxylated alcohol. The drilling fluid may also contain one or more of at least one salt, an alkaline material, a viscosifying agent, a starch or starch derivative, a bridging agent, a weighting material, and a diesel oil or non-aromatic oil.