SLB proposed CAL-Acid scale dissolver as a viable fast-acting, noncorrosive alternative to conventional mineral acid treatments of carbonate scales. After a stringent qualification covering corrosion measurements; crude, fluids, and material compatibility testing; and assessment of emulsion and asphaltene tendency, the operator approved a 50% CAL-Acid scale dissolver solution for the descaling operation. After three consecutive placements of 125 bbl of the 50% CAL-Acid scale dissolver solution, the carbonate scale blockage was successfully removed, as confirmed by a wireline inspection performed by the operator.