Mechanistic Investigation of Vertical Sweep Efficiency in Miscible CO2-WaterCoinjection for EOR and CCUS

G. Yu, J. Tang, L. Li, W. Rossen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The main objective of this study is to understand the vertical sweep efficiency with miscible CO2-watercoinjection as a secondary recovery method, from multiple perspectives: phase behavior, total relative mobility, fluid densities/viscosities, the driving forces and consequent phase distributions etc. We also seek to provide insights into modeling approaches for representing the injection process by comparing compositional simulation results to those of the fractional-flow method and the model of Stone and Jenkins (Stone, 1982; Jenkins, 1984). We combine compositional simulation and analytical models to interpret the dynamics that affect vertical sweep efficiency in miscible CO2-water-coinjection. Stone's model for gravity segregation at steady state predicts three phase-distribution zones: mixed zone, override zone and underride zone. In addition to these three zones, we identify from simulations an extended mixed zone and extended override zone in miscible CO2-water-coinjection, contributing to additional oil recovery and CO2 trapping. The extended zones are a result of dispersion that reflects physical and numerical dispersion in the gas-oil displacement front. To the extent that it reflects numerical dispersion, the extended zones can be considered as a numerical artifact.

Original languageEnglish
Title of host publication84th EAGE Annual Conference and Exhibition
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Number of pages5
ISBN (Electronic)9781713884156
Publication statusPublished - 2023
Event84th EAGE Annual Conference and Exhibition - Vienna, Austria
Duration: Jun 5 2023Jun 8 2023

Publication series

Name84th EAGE Annual Conference and Exhibition


Conference84th EAGE Annual Conference and Exhibition

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology
  • Geophysics
  • Geotechnical Engineering and Engineering Geology


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