Abstract
With the increased global demand for crude oil, the increased reservoir lifetime, and the need for enhanced oil recovery methods, CO2 injection has become an efficient choice. This paper aimed to determine optimal CO2 injection choices using genetic algorithm, involving both optimized gas storage and enhanced oil recovery. There was no overlap between the objectives. Each was directly optimized and several optimal scenarios were developed at the same time. An advantage of this optimization method is that it is able to modify production scenario according to variations in optimization parameter values.
Highlights
Enhancing oil recovery by CO2 injection has recently attracted much attention [1] [2]
Oil production increased by 1,500,000 barrels and CO2 storage increased by 32 billion ft3
Storage becomes more important as CO2 emission tax increases
Summary
Enhancing oil recovery by CO2 injection has recently attracted much attention [1] [2]. Gas or water drive methods usually leave 25% 50% of oil in reservoirs [3]. A considerable portion of the remained oil can be recovered if oil contacts a miscible fluid. Such miscible fluid is formed through the combination of CO2 and oil under the desired conditions [4] [5]. CO2 is injected in both miscible and immiscible ways. It is used for both tertiary recovery (oil recovery after water injection) and secondary recovery [6].
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