Publications

The discovery of new conventional gas resources in Indonesia has become increasingly scarce, compelling oil and gas companies to develop resources with high impurities, such as CO2. Sustainability has become increasingly important for the oil and gas industry, making development of high-CO2 gas fields challenging without adequate CO2 emissions management. Consequently, Carbon Capture Storage (CCS) plays a crucial role in addressing this concern.

Medco operates gas fields in the South Sumatra Block, in Sumatra, Indonesia and is committed to securing gas supply to meet existing gas contracts. This includes developing new discoveries with high CO2 content, such as the Arung-Nowera field, which has 87 BCF of recoverable gas with 58% CO2. Due to its high CO2 content, Medco is progressing development of the field with mitigation of the greenhouse gas emissions by incorporating CCS. The CO2 will be captured, compressed, transported and injected into an underground store. Preliminary evaluation, risk-based screening and comprehensive subsurface evaluations have been conducted to select the best CO2 storage candidate from numerous storage candidates. A depleted gas reservoir, the Teras gas field, is selected as the best candidate for underground CO2 storage.

This study briefly describes the scope, workflow, methodology, key findings and recommendations of the subsurface study in Teras Field. The scope includes static and dynamic modeling, injection scenario, injection well location evaluation, injection well flow assurance, coupled reservoir-geomechanic modeling, geochemistry, legacy well integrity, injection well design, and monitoring method evaluation. The study concludes that Teras field is a viable CO2 storage candidate.

The Arung-Nowera CCS project is an example of a comprehensive and complete subsurface workflow to evaluate the technical feasibility of storage in the area, thereby reducing project risk during the early phase of the project.