Nowadays many exploration and production companies have high interest in producing deep, high pressure gas reservoirs that contain sour gas. Carbonates in East Java, Indonesia faced challenges related to workover and completion operations that are prone to kick-loss cycles based on the drilling experiences.The presence of hydrogen sulfide (H 2 S) and carbon dioxide (CO 2 ) in the formation made the completion operation dangerous and difficult to be carried out in the field where is adjacent to a populated area, thereby increasing the requirement and need to prevent the release of sour gases during completion operations.