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Experimental investigation of yield stress measurements for Alcoflood and Xanthan polymers solutions and their emulsions with crude oil were studied by using RheoStress RS100 under controlled stress mode. The yield stress study was investigated over a wide range of polymer concentration, two concentrations of crude oil, and different type of polymers. For the same polymer concentration of 104 ppm, the aqueous solution of AF1285 reported a higher resistance to flow than the aqueous solution of AF1235. The apparent yield stresses for Alcoflood aqueous solutions and their crude oil emulsions are increased by polymer concentration. Higher concentration of Xanthan aqueous solutions showed higher ascending and descending rheograms. For Xanthan concentration of ≤ 1000 ppm, very low yield stresses are found for all the Xanthan solutions and oil emulsions. For 75% crude oil emulsions, almost similar rheograms behaviors are reported for all the tested Xanthan concentrations. The yield stress analysis showed that the higher Xanthan concentration leads to a higher resistance for both of aqueous solutions and emulsions to startup.

Yield Stress of Alcoflood and Xanthan Polymers Solutions and Their Emulsions with Crude Oil