OGJ FOCUS: Rig-site equipment determines drilling fluid weight material sag

A series of experiments determined the equipment needed for finding the degree of sedimentation or sag in various drilling fluids at a rig site.The design makes use of equipment already specified in other API procedures.Sedimentation of weighting materials in drilling fluids affects both safety and operational efficiency during drilling and completion. With barite sag, gas kicks can occur easily.The experiments used a wide variety of suspensions and demonstrated the potential for use of a simple direct-weight measurement for suspension stability.The tests included several model suspensions with several solvents (water and oil) and solutes (barite and sand).The equipment designed provides ...

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