Displacement front behavior of near miscible CO2 flooding in decane saturated synthetic sandstone cores revealed by magnetic resonance imaging |
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| Institution: | 1. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China;2. Research Institute of Innovative Technology for the Earth, Kizugawa City, Kyoto 619-0292, Japan;1. Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, USA;2. Magnetic Resonance Spectroscopy Core Facility, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, USA;1. Department of Radiology, University of Wisconsin-Madison, Madison, WI, USA;2. Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Germany;3. Clinic of Radiology and Nuclear Medicine, Basel University Hospital, Basel, Switzerland;4. Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, USA;5. Department of Medical Physics, University of Wisconsin-Madison, Madison, WI, USA;6. Pathology Clinic, University of Wisconsin-Madison, Madison, WI, USA;7. Department of Medicine, University of Wisconsin-Madison, Madison, WI, USA;8. Department of Emergency Medicine, University of Wisconsin-Madison, Madison, WI, USA;9. Department of Surgery, University of Wisconsin-Madison, Madison, WI, USA;1. University of Maryland College Park, College Park, MD 20742, United States;2. Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States;3. National Cancer Institute, Bethesda, MD 20892, United States;4. Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI 53792, United States;5. GenEpria Consulting Inc., Columbia MD 21046, United States |
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| Abstract: | It is of great importance to study the CO2-oil two-phase flow characteristic and displacement front behavior in porous media, for understanding the mechanisms of CO2 enhanced oil recovery. In this work, we carried out near miscible CO2 flooding experiments in decane saturated synthetic sandstone cores to investigate the displacement front characteristic by using magnetic resonance imaging technique. Experiments were done in three consolidated sandstone cores with the permeabilities ranging from 80 to 450 mD. The oil saturation maps and the overall oil saturation during CO2 injections were obtained from the intensity of magnetic resonance imaging. Finally the parameters of the piston-like displacement fronts, including the front velocity and the front geometry factor (the length to width ratio) were analyzed. Experimental results showed that the near miscible vertical upward displacement is instable above the minimum miscible pressure in the synthetic sandstone cores. However, low permeability can restrain the instability to some extent. |
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