title: Displacement front behavior of near miscible CO2flooding in decane saturated synthetic sandstone cores revealed by magnetic resonance imaging.
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 CO2enhanced oil recovery. In this work, we carried out near miscible CO2flooding 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 450mD. The oil saturation maps and the overall oil saturation during CO2injections 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.
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Teng
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China; Research Institute of Innovative Technology for the Earth, Kizugawa City, Kyoto 619-0292, Japan. Electronic address: lanlan@dlut.edu.cn.
authors.forename: Lanlan
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
authors.forename: Jiafei
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
authors.forename: Dayong
authors.initials: D
authors.lastname: Wang
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China. Electronic address: songyc@dlut.edu.cn.
authors.forename: Yongchen
authors.initials: Y
authors.lastname: Song
mesh_terms: D000473:Alkanes / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D010539:Permeability; D016062:Porosity; D011312:Pressure
chemical_list: D000473:Alkanes; D002245:Carbon Dioxide; C012867:decane
keywords: Displacement front; Magnetic resonance imaging; Stability; Synthetic sandstone cores; Two phase flow