Improvement of borehole and casing assessment of CO2-EOR/CCUS injection and production well candidates in Sukowati Field, Indonesia in a well-based scale

Abstract

Based on the health, safety, and environment (HSE) aspect, specific regulations of CO2 injection wells for enhanced oil recovery (EOR) and carbon capture, utilization, and storage (CCUS) must be carefully prepared before its implementation.In 2019, the Asian Development Bank as a donor institution provided a technical assistance grant for Battelle Memorial Institute to perform an initial review and evaluation done per field basis of Indonesian first pilot project CO2-EOR and CCUS at Sukowati Field, East-Java. This field has many challenges: reservoir fluid containing 20%–25% CO2 and 3%–4% H2S, total lost circulation issues in interest zones, and complex unsolved problems during the drilling operation.However, based on the industry standards and experiences worldwide, obtaining knowledge, referring to standards, and evaluating per well basis are mandatory to be conducted especially for a pilot project.Therefore, this first per well basis study in Indonesia aimed to improve per field basis Battelle’s review and analyze the results based on the experiences and lesson learned from countries that have applied CO2-EOR/CCUS.The findings of this study can help for a better understanding of the actual condition of the well integrity, particularly related to borehole and casing, and its appropriateness for the planned CO2 injection operation.The results will also be used for designing well integrity and well barrier; thus, well lifetime can be designed based on engineering and economic feasibility. Furthermore, these results will be used to support the regulatory bodies in making regulations for design, operation, lifetime monitoring, and mitigation as well as to be used by the operator.

Keywords

• Casing
• CCUS
• CO2-EOR
• Injection well
• Well integrity