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Drilling Mud

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Drilling mud, used in the petroleum industry for drilling of oil and gas wells, is comprised of a mixture of clay, water, chemical additives, and weighting materials. Its primary use is to flush out rock cuttings from a well, but it also serves as a lubricant and cooling agent for the drill bit. Other uses include maintaining pressure at the bottom of the oil well, as well as preventing the walls of the well hole from caving in, and other fluids from entering the oil well.