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* ''Reduction of torque and drag problems''—Since oil is the continuous phase, the borehole and the tubulars are wetted with a lubricating fluid. This is a distinct advantage in deviated wellbores.
* ''Reduction of torque and drag problems''—Since oil is the continuous phase, the borehole and the tubulars are wetted with a lubricating fluid. This is a distinct advantage in deviated wellbores.
* ''Thermal stability''—Oil-based muds have shown stability in wells, with BHTs of [[temperature::585°F]]
* ''Thermal stability''—Oil-based muds have shown stability in wells, with BHTs of [[temperature::585°F]]
* ''Resistance to chemical contamination''—Carbonate, evaporite, and salt formations do not adversely affect the properties of an oil mud. CO<sub>2</sub> and H<sub>2</sub>S can easily be removed with the addition of lime (CaCO<sub>3</sub>).
* ''Resistance to chemical contamination''—Carbonate, [[evaporite]], and salt formations do not adversely affect the properties of an oil mud. CO<sub>2</sub> and H<sub>2</sub>S can easily be removed with the addition of lime (CaCO<sub>3</sub>).
Disadvantages of oil-based mud systems include the following:
Disadvantages of oil-based mud systems include the following: