An extensive experimental study was performed to investigate the effect of various parameters such as temperature, pressure, and crude oil API gravity on the fluid interactions in the binary systems of brine-CO 2 and two heavy oil-CO 2 systems. The solubility of CO 2 in 20 000 ppm brine solution was measured at various experimental conditions. The solubility of CO 2 and swelling factor, due to the CO 2 dissolution, of two heavy crude oil samples (type-I: 8API ¼ 20.44 and type-II: 8API ¼ 15.49) were experimentally measured at various operating conditions.Results showed that the solubility of CO 2 in heavy oil increased when the experimental pressure increased, and when the experimental temperature decreased. At a constant pressure of P exp ¼ 3.44 MPa, the solubility of the CO 2 was measured to be 10.13, 5.72 g CO 2 /100 g oil in the type-I crude oil when the temperature increased from T ¼ 21 to 45 8C. Increasing the experimental pressure from P exp ¼ 1.38 MPa to 3.44 MPa at a constant temperature of T ¼ 21 8C increased the solubility of the CO 2 from 2.37 to 7.84 g CO 2 /100 g oil in the type-II crude oil. The reduction in the oil API gravity had an adverse effect on the CO 2 solubility. At a temperature of T ¼ 21 8C and a pressure of P exp ¼ 3.44 MPa, the CO 2 solubility decreased from $10.13 in the type-I oil to 7.84 g CO 2 /100 g oil in the type-II oil. The measured values of the swelling factor showed that the type-I and type-II crude oils could exhibit a maximum swelling factor of 1.079 and 1.052 at a temperature of T ¼ 21 8C and a pressure of P exp ¼ 3.44 MPa.
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