#TITLE_ALTERNATIVE#

• Main Author: CAESAR SILAMBA (NIM: 12213093), IMANUEL
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22553
• Institution: Institut Teknologi Bandung

The presence of CO2 in oil and gas wells results in degradation of cement sheath inside the wellbore through carbonation process, which increase the porosity and permeability and reduce both compressive and shear bond strength of cement sheath. This may results in failure of the main functions of cement in wellbore, which are to isolate dangerous zone, support the casing, and hold the pressure from the formation fluid. Therefore, it is obligatory for the cement in CO2 injection wells to be specially designed to withstand the CO2 presence during the injection process. Most of the time, a CO2 injection well is specially drilled and completed with CO2-resistant cement, but recently an idea to convert conventional wells into CO2 injection wells by doing a conversion cementing program has been developed. <br /> <br /> <br /> This study focus on conversion program of an exploration well into a CO2 injection well. The program includes cement evaluation of existing well to be converted into CO2 injection well, cement slurry composition for CO2 injection well, and workover procedure to convert an exploration well into a CO2 injection well. Standards used in this study refer to API Spec 10A and API TR 10TR1. <br /> <br /> <br /> This study concludes that well X which is a conventional well is cemented using Portland cement that is prone to degradation through carbonation process. Another problem is that well X has poor cement bonding quality indication in certain interval, and thus remedial cementing is required to improve the bonding quality of cement sheath, before well X is converted into CO2 injection well. The remedial cementing process may use either cement with swellable additive or resin cement, based on the result of to-be-performed injectivity test. Well X then will be converted into CO2 injection well by using small diameter casing which is cemented with CO2-resistant cement.