Pendant drop method is employed to investigate interfacial tension, bond number, and swelling behavior of crude oil in the presence of brine solutions comprised of MgSO₄ and its solution saturated with carbon dioxide (CO₂) (i.e. carbonated MgSO₄ solution) in different temperatures and pressures, up to 80°C and 4000 psi. The results reveal that as the temperature increases, the measured dynamic IFT values getting more close to each other. In detail, the measured dynamic IFT values for the temperature of 30°C are wider than those measured for the temperature of 80°C. Besides, the results demonstrated that not only the dissolution of brine in carbonated brine can reduce the swelling factor which means a barrier against the better dissolution of carbon dioxide into the drop phase but also this salt dissolution can shift the crossover pressure toward the lower values of around 1000 psi from its original value of around 2000 psi. Moreover, examining the effect of pH reveal that at low pH value (i.e., 3.5), a reduction of about 7.6 mN/m in IFT values can be obtained. In sum up, it was deduced that the addition of CO₂ which reduced the acidity of the aqueous phase due to the formation of carbonic acid caused the interruption of ionization of basic natural surfactants, consequently causing a significant diminish of IFT reduction compared to IFT of crude oil/brine solution. In addition, at a constant temperature, the presence of more CO₂ to the aqueous phase at higher pressures leads to IFT reduction as a function of pressure. Moreover, the results confirm that at pressures lower than the crossover point, the effect of temperature variation on the swelling is insignificant but at pressures higher than crossover point swelling factor increases as a function of temperature. Furthermore, the results reveal that the dissolution of salt into the carbonated water reduces the crossover pressure. As the last point, the measured swelling factor revealed that the presence of CO₂ combined with the effect of temperature may lead to an ultimate swelling factor of about 1.32 which means 32% enhancement in the initial volume of the drop oil as it is contacted to the carbonated brine under the temperature of 80°C.

垂降法用于研究在含有MgSO ₄的盐溶液及其被二氧化碳（CO ₂）饱和的溶液（即碳酸MgSO ₄）存在下原油的界面张力，键数和溶胀行为。溶液）在高达80°C和4000 psi的不同温度和压力下。结果表明，随着温度的升高，测得的动态IFT值变得越来越接近。详细地，在30°C的温度下测得的动态IFT值比在80°C的温度下测得的IFT值宽。此外，结果表明，不仅盐水在碳酸盐水中的溶解可以降低溶胀系数，这意味着阻碍二氧化碳更好地溶解到液滴相中，而且盐的溶解还可以使交叉压力向较低的CO 2值转移。它的原始值约为2000 psi，约为1000 psi。此外，检查pH的影响表明，在低pH值（即3.5）下，IFT值可降低约7.6 mN / m。总而言之，_{如图2所示}，其由于碳酸的形成而降低了水相的酸度，导致碱性天然表面活性剂的电离中断，因此，与原油/盐水的IFT相比，IFT的降低显着减小。另外，在恒定温度下，存在更多的CO ₂在较高压力下加入水相会导致IFT随压力的降低而降低。此外，结果证实，在低于交叉点的压力下，温度变化对溶胀的影响不明显，但是在高于交叉点的压力下，溶胀因子随温度而增加。此外，结果表明，盐溶解到碳酸水中降低了穿越压力。最后一点，测得的溶胀系数表明，CO ₂的存在与温度的影响相结合可能会导致最终溶胀系数约为1.32，这意味着与之接触的滴油的初始体积增加了32％。 80℃下的碳酸盐水。