Abstract
The phase behavior and precipitation yield of a commercial phosphino-polyacrylate inhibitor (PPAA) widely employed in precipitation squeeze treatments have been characterized as a function of temperature, pH, and the Ca 2+ and PPAA concentrations. Contrary to expectations, over a range of conditions the yield of phase-separated PPAA was found to be less than 50% and sometimes as low as 5%. Studies on a sample of isolated precipitate show that it has significant solubility even in brines with high Ca 2+ concentration. Ca 2+-induced fractionation of the polymeric inhibitor by molecular weight has been identified as the mechanism responsible for both the observed precipitation and re-dissolution behavior. Implications of these results for the optimization of precipitation squeeze treatments are discussed.
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