The filtration of drag reducing fluids.

Abstract

The filtration of drag reducing fluids has been studied in order to determine the variations in the resistance of filter cake and filter septum at different pressures. At the beginning of operation, both average specific cake resistance and filter medium resistance of filtration are important at any particular pressure and constant temperature; however, the filter cake resistance plays a dominant role in the remainder of a filtration run after a certain time interval. The average specific filtration resistance and filter medium resistance were computed from the relationships of filtrate volume versus effective time; the effective time of commencement of filtration was obtained by least-squares fitting of a developed equation. The results obtained from the data collected during constant pressure filtration indicated that average specific filtration resistance was decreased by increasing the concentration of Polyox WSR Coagulant in the aqueous solution slurry. However, the filter medium resistance was found to increase under the same conditions.