Mobility of ethomeen C12 and carbon dioxide (CO 2) foam at high temperature/high salinity and in carbonate cores

Citation:

L. Cui, Ma, K., Puerto, M., Abdala, A. A., Tanakov, I., Lu, L. J., Chen, Y., Elhag, A., Johnston, K. P., and Biswal, S. L., “Mobility of ethomeen C12 and carbon dioxide (CO 2) foam at high temperature/high salinity and in carbonate cores,” SPE Journal, 2016.

Abstract:

The low viscosity and density of carbon dioxide (CO2) usually result in the poor sweep efficiency in CO2-flooding processes, especially in heterogeneous formations. Foam is a promising method to control the mobility and thus reduce the CO2 bypass because of the gravity override and heterogeneity of formations. A switchable surfactant, Ethomeen C12, has been reported as an effective CO2-foaming agent in a sandpack with low adsorption on pure-carbonate minerals. Here, the low mobility of Ethomeen C12/CO2 foam at high temperature (120°C), high pressure (3,400 psi), and high salinity [22 wt% of total dissolved solids (TDS)] was demonstrated in Silurian dolomite cores and in a wide range of foam qualities. The influence of various parameters, including aqueous solubility, thermal and chemical stability, flow rate, foam quality, salinity, temperature, and minimum-pressure gradient (MPG), on CO2 foam was discussed. A local-equilibrium foam model, the dry-out foam model, was used to fit the experimental data for reservoir simulation

Notes:

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