Perpustakaan Digital ITB

This study aims to design a comprehensive horizontal well for CO? injection in the “To” carbonate formation of an offshore XYZ-001 Well in Sulawesi. The main objectives are to plan the well trajectory, determine casing size and setting depth, conduct casing load analysis, predict corrosion rates, select appropriate materials, and classify well barriers. The overall scope highlights the development of a comprehensive well design that ensures mechanical reliability and long-term integrity under highly corrosive CO? environments. The methodology was carried out through integrated simulations using Halliburton’s Landmark COMPASS for trajectory planning, Casing Seat by Halliburton and StressCheck by Halliburton for casing design and load analysis, and Electronic Corrosion Engineer (ECE) for corrosion rate prediction. The workflow included trajectory design, casing and liner load verification under burst, collapse, axial, and triaxial stresses, corrosion rate prediction for L-80 carbon steel material, and evaluation of material alternatives. Based on these results, material selection and well barrier classification were performed in compliance with API 5CT, NORSOK M-710, and NORSOK D- 010 standards to ensure both mechanical reliability and corrosion resistance. The planned trajectory follows a single-build design with a kick-off point at 5300 ft TVDRT, reaching the “To” Formation at 7217.8 ft TVDRT, and a horizontal section of 1881 ft classified as long-radius. The casing program includes 30? conductor casing, 20? surface casing, 13?? and 9?? intermediate casings, 5½? liner, and 3½? tubing. Load analysis confirmed all casing strings satisfy the applied design factors. Corrosion rate prediction showed that L-80 carbon steel liner would fail approximately after 8 years and tubing approximately after 3 years, indicating the necessity of corrosion-resistant alloys. Consequently, 13Cr stainless steel was selected for liner and tubing, combined with premium gas-tight connections, Class FF wellhead, and HNBR elastomers. The final barrier system provides independent primary and secondary barriers, ensuring long-term well integrity.