Chemicals used in oil drilling; chemicals for use in oil and gas industry for oil drilling, oil purifying; chemical additives for use in oil and gas wells; chemicals for use in the field of oil exploration and production; chemical agents for chelating; organic acids for industrial purposes, namely, phosphoric acid, hydrochloric acid, hydrofluoric acid, and sulfuric acid; industrial chemicals, namely, acid used to stimulate oil and gas wells; acidizing fluids, namely, hydrochloric acid, hydrof...