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Publication Detail
An integrated evaluation of enhanced oil recovery and geochemical processes for carbonated water injection in carbonate rocks
© 2019 Elsevier B.V. During carbonated water injection and CO2-WAG scenarios for enhanced oil recovery, dynamic transfer of CO2 from aqueous phase into resident oil can cause complex pH variations, which can affect mineral dissolution around wellbore and precipitation in reservoir. Also, transfer of CO2 from carbonated water into live oil can liberate light components of the oil, which would create gas phase in-situ. In this investigation, a novel methodology was developed to numerically simulate these complex processes in an integrated approach. This study could present one step closer to realistic evaluations of dynamic CO2 transfer from carbonated water to resident oil and consequent interactions with the reactive minerals in a carbonate reservoir. Taking account of the data of coreflood experiments performed on a carbonate rock under 3100 psi and 100 °C, profiles of ionic concentration of produced brine and rock weight during carbonated water injection into a dry core (in the absence of oil) were history-matched to tune reaction parameters. Calcite reaction parameters (surface area and activation energy) were tuned to match profile of concentration of Ca++. Also, for additional oil recovery and dP profiles, secondary and tertiary carbonated water injection experiments were matched simultaneously to obtain relative permeability curves and CO2 mass transfer parameters. This new approach is called co-history-matching. Using the tuned parameters in a radial sector model, a series of simulations was performed to analyse change in rock porosity and enhanced oil recovery for large scales for carbonated water injection. Results of the large-scale model have demonstrated that minerals dissolution takes place mostly in vicinity of the injection wellbore. However, the simulation results demonstrated that injection of short cycle of carbonated water followed by plain water would alleviate the dissolution issue, while significant additional oil recovery is achieved.
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