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Experimental and modelling study of the solubility of CO_2 in various CaCl_2 solutions at different temperatures and pressures

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Petroleum Science 2014年第4期11卷 569-577页

作者： Alireza Bastami Mohammad Allahgholi Peyman Pourafshary Institute of Petroleum Engineering School of Chemical Engineering Faculty of Engineering University of Tehran Institute of Petroleum Engineering School of Chemical Engineering Faculty of Engineering University of Tehran (Now with Department of Petroleum and Chemical Engineering Sultan Qaboos University)

Study of the thermodynamic behaviour of CaCl2-H2O-CO2 systems is important in different scientific areas in the chemical and petroleum engineering fields. For example, a system including salt- H20-CO2 is a common system in CO2 geological storage. During carbonate matrix acidizing, this mixture also appears as the spent acid. Hence, study of the behaviour of this system and the solubility of CO2 in CaCl2 brine in different thermodynamic conditions is critical. In this study, CO2 solubility in 0, 1.90 and 4.80 mol/L CaCl2 solutions at 328.15 to 375.15 K and 68.9 to 206.8 bar were measured. These values are normal for oil reservoirs. A popular thermodynamic model is available in the literature for estimating the CO2 solubility in pure water and NaC1 solutions. In this paper, the available model was modified by experimental work to be applicable for CaCl2 as well. Based on the measured data, the component interaction parameters in the base model were adjusted for a CaCl2-H2O-CO2 system. The developed model could predict CO2 solubility in different conditions with remarkable accuracy, particularly for high concentration solutions and at high pressures. This improvement is up to 65% better than in the base model. This model can be used in Darcy scale models for predicting wormhole propagation during carbonate matrix acidizing.

关键词： solubility of CO2-CaCl2 carbonate acidizing spent acid wormhole propagation modelling,solubility measurement

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