Arild Saasen, Craig Marken, Njil Sterri Rogaland Research Stavanger, Norway Jon Jakobsen Phillips Petroleum Co. Norway Tananger, Norway Very low shear rate and oscillation rheometry techniques provide insight into the properties of drilling fluids that are associated with barite sag observed during drilling operations. A detailed study of the rheological behavior of four field muds was completed with a controlled-stress rheometer. The techniques verified that detailed Theological studies of muds are needed to explain barite sag. Barite sag can be the source of severe drilling and well control problems during the dril...

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