Abstract
OLI ScaleChem software (OLI Systems, Morris Plains, NJ) predicts the mineral scaling potentials of 54 solids for virtually any oil and gas well and processing facility in the world. ScaleChem provides several advantages over other commercially available scaling software: (1) by including all brines in the calculations, the well and processing facility are modeled more accurately; (2) the scaling potential and scale buildup are reported at each calculation point; (3) pH and charge balance are automatically corrected; therefore, the chance of unexpected problems from poor water analyses decreases and more effective treatment can be made; (4) organic acid concentrations are automatically removed from the measured alkalinity, therefore producing a true brine alkalinity; (5) the behavior of any mixture of chemicals in water and mixed solvent can be accurately predicted. This article presents the prediction of calcium carbonate scaling tendency of formation water, injection water, and the mixing of injection water with formation water at different temperatures. The experimentally measured chemical analyses of formation water and injection water were used by OLI ScaleChem software to determine the tendency of scale formation. This software has been applied to investigate the potential of calcium carbonate scale precipitation in Iranian oil fields, either onshore or offshore, where water injection is being performed for desalting units' water disposal purposes or as a method of secondary recovery or reservoir pressure maintenance. As temperature was increased, the scaling tendency of calcium carbonate increased, as predicted by OLI ScaleChem software.
Published Version
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