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98062 PREDICTION OF pH AND MINERAL SCALING IN WATERS WITH VARYING IONIC STRENGTH CONTAINING CO2 AND H2S FOR O<T(°C)<200 AND 1<P(BAR)<500

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Product Number: 51300-98062-SG
ISBN: 98062 1998 CP
Author: Baard Kaasa, Terje OstvoId
Industry: Oil and Gas Production
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A model to predict pH and mineral scaling is presented, We have included a complete PVT model to describe the hydrocarbon phases. This model gives the CO2 and H2S fugacities which are used to determine CO2 and H2S concentrations in the water phase. The water phase including all the common equilibria is described using the Pitzer model to correct for non ideality. The model is applicable in the temperature and pressure ranges 0-200°C, 1-500 bar, respectively, and for a ionic strength up to =3 M. Model calculations have been compared with experimental pH and solubility data, The agreement is within +-0. 1 pH unit and within 10% for solubility data of the normal scale forming minerals. Keywords: pH, scale, carbon dioxide, calcium carbonate, equations of state, PVT-model
A model to predict pH and mineral scaling is presented, We have included a complete PVT model to describe the hydrocarbon phases. This model gives the CO2 and H2S fugacities which are used to determine CO2 and H2S concentrations in the water phase. The water phase including all the common equilibria is described using the Pitzer model to correct for non ideality. The model is applicable in the temperature and pressure ranges 0-200°C, 1-500 bar, respectively, and for a ionic strength up to =3 M. Model calculations have been compared with experimental pH and solubility data, The agreement is within +-0. 1 pH unit and within 10% for solubility data of the normal scale forming minerals. Keywords: pH, scale, carbon dioxide, calcium carbonate, equations of state, PVT-model
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