Drill fluid is a substance used in the process of drilling a borehole into the earth's surface. It is injected into the wellbore in order to lubricate the drilling bit and to prevent the formation of underground cavities caused by the pressure of the drilling process. It also removes rock cuttings or "drilling mud" from the bottom of the wellbore. Drill fluid is typically a mixture of clays, water, and additives that work together to perform a variety