Calcium Chloride is used in establishing and maintaining oil and gas wells. It helps well fluids gain needed consistency, increases density and stabilizes shale formations. As a completion fluid it seals well casings and displaces drilling mud. In short, Calcium Chloride is used in several applications for new or existing wells to improve efficiency and production. Calcium Chloride Prills are used in gas and oil drilling. It helps keep gases from forming and helps sludge from getting out of hand.