Abstract
Abstract Polymers and sulfonates are often part of the multicomponent chemical systems designed to increase oil recovery from depleted reservoirs. The objective of this work was to develop reliable, analytical methods for measuring Polyacrylamide concentration in the presence of sulfonates. The need for new or improved methods arose because petroleum sulfonates caused interference with the standard turbidimetric method for determining Polyacrylamides. This interference was eliminated by the addition of a butanol-extraction step to remove sulfonates. Based on the new manual procedure, an automated method was developed for use with a Technicon Auto-Analyzer™ to reduce analysis time. The automated method was designed with four modes of operation to cover high and low polymer concentrations with and without sulfonates present in the samples. Polymer concentrations ranging from 10 to a maximum of 1,200 wt ppm [10 to 1200 mg/kg] can be measured. A unique feature of the automated method is the continuous-flow solvent extraction. Depending on the mode, Auto-Analyzer throughput is 20 or 30 samples per hour. The accuracy of the results is 5% with extraction and 1% without extraction.
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