title: Magnetic resonance imaging on CO(2) miscible and immiscible displacement in oil-saturated glass beads pack.
abstract: In this study, the displacement processes were observed as gaseous or supercritical CO(2) was injected into n-decane-saturated glass beads packs using a 400-MHz magnetic resonance imaging (MRI) system. Two-dimensional images of oil distribution in the vertical median section were obtained using a spin-echo pulse sequence. Gas channeling and viscous fingering appeared obviously in immiscible gaseous CO(2) displacement. A piston-like displacement front was detected in miscible supercritical CO(2) displacement that provided high sweep efficiency. MRI images were processed with image intensity analysis methods to obtain the saturation profiles. Final oil residual saturations and displacement coefficients were also estimated using this imaging intensity analysis. It was proved that miscible displacement can enhance the efficiency of CO(2) displacement notably. Finally, a special coreflood analysis method was applied to estimate the effects of capillary, viscosity and buoyancy based on the obtained saturation data.
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Yuechao
authors.initials: Y
authors.lastname: Zhao
authors.forename: Jiafei
authors.initials: J
authors.lastname: Zhao
authors.forename: Yongchen
authors.initials: Y
authors.lastname: Song
mesh_terms: D000465:Algorithms; D002245:Carbon Dioxide / Q000737:chemistry*; D004867:Equipment Design; D005898:Glass; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D009821:Oils; D010539:Permeability; D011312:Pressure; D013696:Temperature; D013997:Time Factors; D014783:Viscosity
chemical_list: D009821:Oils; D002245:Carbon Dioxide