Best Practices to Achieve Optimization for Large Scale Offshore Carbon Capture & Storage Facilities

Abstract

Abstract Carbon Capture and Storage (CCS) is a key enabler for carbon emission efforts for a more sustainable future while fulfilling energy demand. However, CCS, especially when implemented offshore is costly and can be detrimental to project economics. A focused and methodological approach is critical in Front End Loading (FEL) to ensure optimization strategies are considered in the CCS development. The intent of this paper is to share the journey and knowledge gained throughout the front-end loading process in developing a large-scale offshore CCS project. The success of the project lies in the effective management of integrated subsurface-surface decisions, collaboration with stakeholders, and commercial arrangements. Specific workflow which identified and screened CO2 storage location, volume, integrity, and containment of the injected CO2 over time was developed. It integrates key decisions such as handling low permeate stream, EOS selection, maximizing hydrocarbon recovery and pressure boosting technology concept. This was achieved via a comprehensive technology screening and selection method, evaluating its impact to the facilities design and injection wells, which ultimately affects the economic value of the development. A stakeholder management plan inclusive of technology providers and CCS experts, project execution delivery, commercial and Health, Safety and Environment (HSE) was also developed to ensure successful alignment for project progress and to protect the economic viability. Structured evaluation and methodology enabled critical decisions and proposals to be properly assessed and eventually worked on to optimize the CCS facility. Among the optimizations identified includes an increased permeate pressure from feed source, reduction in surface injection pressure, identified optimum operating conditions, using the right EOS and selecting the highest value technology. Close collaboration between surface, subsurface and technology providers proved to be beneficial in crafting optimized CCS development. It is also important to ensure all required activities during FEL are executed accordingly and with prioritization of decisions to allow proper allocation of resources and to identify and mitigate any risk and uncertainties for the success of this large-scale offshore CCS. More CCS projects are envisioned globally as an enabler to develop high contaminant fields and minimize Green House Gas (GHG) emission. Validated learnings and progressive experiences gained from this project will play a pivotal role and can serve as reference to other CCS projects.