Water Well Drilling Bentonite: Description & Applications Water well drilling bentonite is used in mud rotary drilling. It\'s unique properties make it an important component of the drilling process. Bentonite forms the mud used by the drillers to lubricate the bit, remove cuttings from the borehole, and keep the sides of the borehole from caving in. Provides quick viscosity and lubrication. Reduces fluid loss during excavations. Deposits thin filter cake on bore walls to improve borehole stability Aids hole cleaning Environmentally safe Storage : Water well drilling bentonite is available in 25 kg paper sacks and 1 ton jumbo bag.