Publications

Numerous Onshore North-West Java Basin gas fields, including Randegan Field, face both technical and commercial challenges. Since its discovery in 1939, this mature field has produced approximately 1.8 MMSTB of oil and 57.9 BSCF of gas. However, the existing buyer, who can absorb gas far from the main West Java gas networks, has not renewed the contract due to a demand for cleaner gas. Technical constraints such as limited geological settings, high CO2 content (20-40%), and a low success ratio of well interventions further narrow its commercial viability.

Yet, a glimmer of opportunity arises from a strategic partnership with a gas buyer who commits to providing on-site CO2 removal near the field’s gathering station, enabling Pertamina to supply raw gas. This paper intends to uncover an “inconsequential yet impactful” approach for developing this field by leveraging existing opportunities to support both main and back-up sales gas for the commercialization scheme.

Supported by the facts that prospective layers were revealed from two recent drilled wells in the Randegan Field, integrating subsurface and non-subsurface (e.g., well completion, availability of surface facilities, access to well sites, and commercialization-related) data holistically generates a robust reservoir interpretation to identify candidates for primary and backup well work targeting gas layers. These result in a remarkable 20% increase in the success rate of well works in 2024 compared to the previous year. The success parameter is based on the proven ability to produce hydrocarbons close to, exactly at, or exceeding the proposed target. This approach also successfully delivers an additional 3.7 BSCF of gas reserves for commercialization.

Furthermore, with the same approach, the limited geological conditions of this field offer an opportunity for carbon storage development. Thus, this study outlines both a short-term commercialization plan and a promising long-term strategy for a high CO2 depleted gas field.