10129 Prediction of Mineral Scaling in Oil & Gas Production Using Comprehensive Thermodynamic Model

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Product Number: 51300-10129-SG

ISBN: 10129 2010 CP

Author: A. Anderko, P. Wang, R. D. Springer, M. M. Lencka, and J. J. Kosinski

Publication Date: 2010

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A comprehensive methodology has been developed for predicting mineral scaling in oil and gas production environments. The methodology is based on a previously developed model for mixed-solvent electrolyte systems (MSE). The model relies on a detailed treatment of speciation in the liquid phase. It represents the standard-state properties of individual species using the Helgeson-Kirkham-Flowers equation of state and it predicts the species' activity coefficients on the basis of contributions that reflect long-range electrostatic, short-range ionic, and non-ionic interactions. The model has been designed to calculate phase equilibria in multicomponent systems containing an aqueous phase, multiple solid phases, a gas phase, and a second liquid (typically hydrocarbon-dominated) phase. With this formulation, the model is capable of predicting the formation of scales not only in aqueous systems but also in environments that contain nonaqueous additives such as methanol or mono-, di-, and triethylene glycols. The performance of the model has been analyzed for various solids including calcium sulfate, barium sulfate, calcium carbonate and magnesium carbonate as a function of temperature, brine composition, pressure and the presence of methanol and glycols. Additionally, the effects of metastability have been taken into account for scales that may occur in various crystalline forms.

Keywords: Mineral scaling, modeling, thermodynamics, precipitation, mixed solvents