FEASIBILITY STUDY OF ADDITIVE X TO PORTLAND CEMENT CLASS G FOR THE DEVELOPMENT OF GEOTHERMAL WELL

• Main Author: Budi Tri Prasetyo, Agung
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/39838
• Institution: Institut Teknologi Bandung

In hostile geothermal environments containing acid fluids, high temperature, and Non Condensable Gas for the likes of CO2 encounters many failures in geothermal well due to incompatible well integrity. One of the failures that commonly happened is micro cracks that occurred in cement sheath. Micro crack in cement sheath is determined based on Cement Bond Log-Variable Density Log (CBL-VDL) data analysis. The cement requirements amplitude value for CBL-VDL according to API 10TR1 is less than 10 mV that indicates no micro annulus and channeling, and cement distributed 360?. One of the methods used to overcome micro cracks in cement sheath is the addition of additives in cement slurry. Cement standard for Geothermal well refers to Oil Well Cement, Portland class G according to API Specs 10 A. The additives in Portland cement class G must be compatible and withstand to hostile geothermal environments. One of cement additives that could be used to overcome micro cracks is additive X that developed from company Z. The aim of this study is to conduct a qualitative analysis of the cement sample made by company Z and determine the feasibility for geothermal well. In this study, cement sample was characterized by using FTIR. The result of the study showed that FTIR sample characterization of additive X was epoxy resin based. Epoxy resin in the sample had an ability to prevent micro cracks, filled the voids, and became a secondary barrier in casing sheath. Therefore, the properties of cement samples utilize additive X as an additive met the standard and could be used for geothermal well.