Speaker
Description
Elucidating the dynamic displacement behavior and enhanced oil recovery mechanisms of CO₂ miscible flooding in low-permeability reservoirs is crucial for optimizing sweep efficiency and maximizing ultimate oil recovery. In this study, online nuclear magnetic resonance was integrated with core-flooding experiments on a low-permeability core sample from Jilin, China. In addition to conventional T₂ spectrum and MRI analyses, spatially resolved NMR techniques were employed, including spatial T₂ spectroscopy and one-dimensional spatial distribution mapping. These methods enable real-time, position-resolved monitoring of oil mobilization across micro-, meso-, and macropores throughout the core.The results reveal that: (1) CO₂ miscible flooding simultaneously mobilizes oil from micro-, meso-, and macropores, significantly improving displacement efficiency; (2) The recovery process unfolds in two stages: the initial CO₂ miscible flooding stage before gas breakthrough and the subsequent CO₂ miscible transport stage after gas breakthrough; (3) Both stages critically expand the macroscopic swept volume of CO₂, thereby enhancing overall recovery; and (4) The synergistic effect of miscible flooding and transport underpins the high displacement efficiency of CO₂ miscible flooding. Emphasizing these critical aspects could enhance oil recovery from CO₂ miscible flooding in field production.
Keywords: CO₂ miscible flooding; gas flooding front; online NMR; dynamic characterization; enhanced oil recovery mechanism
| Country | China |
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