Increasing oil production in Trinidad and Tobago (T&T) by means such as Enhanced Oil Recovery (EOR) may be a more cost effective and less risky pathway, when compared to the drilling of exploration and appraisal wells. This is because the fields and reservoirs that would be considered for EOR projects are generally in an advanced state of delineation and there has been experience derived from production data for some time. Considering the scope/applicability of carbon dioxide EOR (CO2-EOR), the revitalization of such projects in T&T would aid in extending the use of CO2 to another purpose, given its useful properties and behaviour, before being emitted to the atmosphere.

Five CO2 EOR pilot projects were implemented in South Trinidad, starting in the early 1970's. At that time, as it is now, Trinidad had abundant CO2 available as a waste product from the ammonia manufacturing operations at the Point Lisas Industrial Estate (PLIE), Central Trinidad. At present, consideration is being made for the reintroduction of CO2 pipeline transport, directed to suitable EOR candidate sites mainly in South Trinidad, focusing once more on CO2 sourced from the PLIE.

Det Norske Veritas (DNV) has introduced a Recommended Practice (RP) on the Design and Operation of CO2 Pipelines (RP-J202), incorporating lessons learned from existing CO2 pipelines around the world. This RP provides guidance for managing risks and uncertainties during the lifecycle of a CO2 pipeline, including design, testing, inspection, operation, maintenance, and de-commissioning.

This paper will use DNV-RP-J202 to present a guiding framework for the possible re-qualification of sections of the existing CO2 pipeline network in Trinidad for the reintroduction of safe and efficient CO2 pipeline operations. The re-qualification process entails the following steps: Initiation, Integrity Assessment, Hydraulic Analysis, Safety Evaluation, Premises, Re-assessment, Modification Alternative(s), Documentation and Implementation.

On completion of the re-qualification process, the majority of the pipeline system may not be acceptable for reintroduction of CO2. Options for consideration can be an adjustment of the pipeline routes where sections of pipeline network are not in acceptable condition, or the development of a completely new pipeline network and/or new routes.

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