Abstract
The application of enhanced oil recovery (EOR) in offshore oil fields has received significant attention due to the potentially enormous amount of recoverable oil. However, EOR application offshore is in its very early stage due to conditions that are more complex than onshore oil fields, owing to the unique parameters present offshore. Therefore, successful EOR applications in offshore oil fields require different screening criteria than those for conventional onshore applications. A comprehensive database for onshore applications of EOR processes together with a limited offshore EOR application database are analyzed in this paper, and the important parameters for successful offshore application are incorporated into the new EOR screening criteria. In this paper, screening criteria to determine acceptable EOR processes for offshore fields, including hydrocarbon gas miscible, CO2 miscible, and polymer processes, are presented. Suggested screening criteria for these EOR processes comprise quantitative boundaries and qualitative considerations. Quantitative screening criteria are predominantly based on quantifiable data, such as oil and reservoir properties. Qualitative screening considerations mainly focus on the operational issues present offshore, including platform space constraints, limited disposal options, injectant availability, and flow assurance matters (including hydrate formation and difficulties in emulsion separation).
Highlights
Korea is globally renowned for its proven and established shipbuilding technology and construction of offshore oilfield development facilities
Korean shipbuilding companies are eagerly seeking new market opportunities to overcome increasing competition, and are investing significant resources in the research and development of offshore oilfield production technologies, such as enhanced oil recovery (EOR) processes: the research presented here arises from this trend
For pilot cases in offshore fields, only cases where EOR fluid was injected into the reservoir for enhanced enhanced oil recovery were considered; single‐well tracer tests or feasibility test cases were not included oil recovery were considered; single-well tracer tests or feasibility test cases were not included for for setting screening criteria but their consideration were applied to setting screening considerations
Summary
Korea is globally renowned for its proven and established shipbuilding technology and construction of offshore oilfield development facilities. Most EOR methods, and most EOR screening criteria, have focused on onshore field application, owing to the relatively low cost, risk, complexity, and high injectant availability compared with with offshore offshorefield fieldapplication. Some disposal but thereand are HSE operational issues if CO concentration in the produced gas injectants require special care and the distance from the shore causes difficulties in quality control is high. Flow are assurance issues are common in offshore but onlytoissues process were putprocess into each relating to each were putscreening into eachconsideration Despite these challenges, EOR application in offshore oil fields is receiving receiving significant significant attention. Considering that the application of EOR techniques in offshore fields is at an an early early stage stage of of development development and shows high potential, screening criteria that are more representative of the specific offshore conditions than the conventional onshore screening criteria are needed.
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