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• W2896754847 abstract "Abstract Polyacrylamide-type polymers are widely used in polymer flooding techniques for mobility control. To monitor the performance of a polymer flooding process in either field application or laboratory testing, it requires the accurate determination of polymer concentrations in the effluents. This paper presents a robust nitrogen-digestion method to determine the concentrations of various types of polymers such as hydrolyzed polyacrylamides, sulfonated polyacrylamides and cationic polyacrylamides. Different from the classical nitrogen-bromination method used to identify polymer concentrations, the nitrogen-digestion method is based on the digestion of amide groups in the polymers as free nitrate ions using digestion device operated at 120ºC. The resultant solutions were measured by a visible light spectrophotometer. The nitrogen contents as measured by absorbance values of the solutions are used for the calculation of the polymer concentrations. The average testing time for each sample is less than 5 minutes. Seven polymer samples from three different polymer types were investigated. The experimental results show good correlations between nitrogen content and absorbance values and the resulting concentration for each polymer sample studied. As the chemical structures of polymers might be altered in the application process, such as hydrolysis of amide groups to hydroxyl groups, the concentration results obtained could be interfered with. Therefore, the infrared (IR) method was used to revise the concentrations obtained by nitrogen-digestion method. A normalized correlation as a rule-of-thumb was set up to categorize the polymer type and determine the polymer concentration. In addition, it was also noted that the measurements of polymer concentration using the nitrogen digestion method are not influenced by the salinities of make-up brines. This paper presents an accurate, portable, and fast way to determine the polymer concentrations in brines. It is of particular importance for field operations." @default.
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• W2896754847 date "2018-04-23" @default.
• W2896754847 modified "2023-09-23" @default.
• W2896754847 title "A Robust Nitrogen-Digestion Method to Determine the Concentrations of Polyacrylamide-Type Polymers" @default.
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• W2896754847 doi "https://doi.org/10.2118/192165-ms" @default.
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