Encountering partial or complete lost circulation is not an uncommon occurrence in Caltex Pacific Indonesia’s (CPI) Duri field in the Central Sumatra basin of Indonesia. Lost-circulation rates can range from one barrel per hour to total losses. The ChevronTexaco affiliate utilized cement and various other conventional lost-circulation materials (LCM) in an attempt to cure the losses, with varying degrees of success. Schlumberger worked closely with the CPI Drilling Team to create a solution to cure the losses and successfully cement casing after blind drilling to total depth.