Typical non-hydrocarbon gases, which have been utilized in miscible and immiscible processes, are carbon dioxide and nitrogen. These gases are usually injected separately and have been rarely utilized together as a tertiary recovery process. In this article, the authors have experimentally
focused on sequential carbon dioxide and nitrogen gas injection as a new enhanced oil recovery method. The periodic injections of carbon dioxide and nitrogen have been repeated for six injection pore volumes. Sensitivity analysis of injection pressure, injection volume, and injection rate
has also been investigated in core flood experiments. The experimental results have revealed that a sequential miscible carbon dioxide and immiscible nitrogen gases injection have the highest oil recovery percentage than near miscible or immiscible carbon dioxide and nitrogen injections. The
experimental results have shown that increasing ratio of miscible carbon dioxide to nitrogen resulted in increasing ultimate oil recovery percentage. This new method has also been compared with typical enhanced oil recovery methods, namely, water, miscible water-alternating-gas, miscible and
immiscible carbon dioxide, and immiscible nitrogen injection using a commercial compositional simulator.
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enhanced oil recovery;
immiscible gas injection;
miscible gas injection;
Document Type: Research Article
Department of Petroleum Engineering, Sharif University of Technology, Tehran, Iran
Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran
Tehran Petroleum Research Center, Petroleum University of Technology, Tehran, Iran
September 2, 2014