Abstract
The effect of addition of lignosulfonates on the viscosity of petroleum sulfonate solutions was investigated in relation to potential applications of such mixtures in enhanced oil recovery. Substantial viscosity increases were recorded. For example, the viscosity of a 4% solution of Petrostep-420 increased from 2 mPa·s to about 15mPa·s upon the addition of 1.5% of Marasperse C-21. The effect of sodium chloride concentration on the viscosity was also studied. It was found that only calcium, or mixed calcium-sodium based lignosulfonates, were effective in increasing the viscosity of petroleum sulfonates. The viscosity effects observed are discussed in reference to the phase behavior observed in the systems.
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