Mahzari, P; Jones, AP; Oelkers, EH; (2019) An integrated evaluation of enhanced oil recovery and geochemical processes for carbonated water injection in carbonate rocks. Journal of Petroleum Science and Engineering , 181 , Article 106188. 10.1016/j.petrol.2019.106188.

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Abstract

During carbonated water injection and CO2-WAG scenarios for enhanced oil recovery, the transfer of CO2 from the aqueous phase into resident oil can cause local spatially pH changes, which can provoke mineral dissolution and precipitation reactions. The transfer of CO2 from carbonated water into the oil phase can also liberate its light components creating a gas phase in-situ. In this investigation, a novel method was developed to numerically simulate these complex processes using an integrated approach. Calculations took account of the results of coreflood experiments performed on a carbonate rock at 3100 psi and 100 oC to optimise reaction parameters. Using the optimised parameters in a radial sector model, a series of simulations was performed to analyse change in rock porosity and enhanced oil recovery for large scale for carbonated water injections. Results demonstrate that mineral dissolution takes place mostly in vicinity of the injection wellbore. However, the simulation results demonstrate 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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