الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
In static conditions drilling fluids must suspend the drilled cuttings and weight material. Removal of the suspended material continues when drilling is restarted. Also the drilling fluid should not make it hard for the surface solid control equipment to deal with the solid delivered to the surface(Baroid, 2013).Fluid buoyancy has a direct effect on the weight support of the drill string used (Burkhardt, 1961). Buoyancy becomes increasingly important as drilling progresses to greater depths. Surface rig equipment would be overwhelmed and won’t support drilling for greater depths if it had to support weight of the drill string and casing in deeper holes alone (Burkhardt, 1961). Mud supports a weight equal or close to the weight of the volume of fluid displaced while running the pipes or casing joints, a greater buoyancy effect occurs as drilling fluid density increases. (Burkhardt, 1961).