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Experimental and theoretical investigations of CO2 injectivity

Sokama-Neuyam Y. A., Ursin J. R.

AGH Drilling, Oil, Gas

2016

Vol. 33, no. 2

245--258

Laboratory sandstone core flooding experiments were conducted to investigate the impact of brine desaturation and salt precipitation on CO2 injectivity. An attempt was then made to reduce the impact of salt precipitation on CO2 injectivity by injecting a slug of diluent prior to CO2 injection. The effect of brine salinity, CO2 injection rate and initial core permeability on the efficacy of this mitigation technique was investigated. Decrease in diluent brine salinity improved injectivity but there exist a critical brine salinity below which CO2 injectivity was further impaired. It was also observed that, above a certain CO2 injection rate, alternating CO2 injection with the diluent brine could not enhance CO2 injectivity. Injectivity improvement also depends on initial permeability of the porous medium. Up to about 30% injectivity improvement was observed in the experiments.