Abstract
Oil permeability measurements of 66 Saudi carbonate and sandstone formations were made and 25% of these data were ranged from 0.5 to 10 millidarcies. An emulsion of 70% Saudi crude oil (Safanyia-Khafji) and 30% polymer-gelled water was selected to fracture these formations. This paper shows the effect of emulsifying agent concentration on the pseudoplasticity nature of the emulsion fracturing fluid.Rheological properties of the oil/polymer-gelled water emulsions were analyzed using a Fann VG viscometer at temperatures of 25, 35, 45, and 55°C. The polymer used was Pusher-500 at a concentration of 1.798wt%. The emulsifying agent (Triton X-100) concentrations were fixed at 0.125, 0.25, 0.5, 0.75, 1.0, 1.5, and 2vol%. A general equation relating the emulsion viscosity to the shear rate and temperature was developed. The equation was used to determine the Metzner and Reed parameters (n' and k').
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