Measurement of Minimum Miscibility Pressure by New Oil Droplet Volume Dynamic Analysis (ODVDA) Method

Determination of the minimum miscible pressure (MMP) of the gas/oil system is essential for a successful carbon dioxide enhanced oil recovery (CO2-EOR) and carbon geological storage applications. Measurement of MMP can be performed with theoretical methods and experimental methods. The slim tube test (STT), the rising bubble apparatus (RBA), and the vanishing interfacial tension (VIT) technique can be considered as the effective experimental methods in the petroleum industry to measure the MMP of oil and gas systems. This paper presents a new experimental method for measuring MMP, named oil droplet volume dynamic analysis (ODVDA) method. The main principle of this method is to dynamically measure the change in the volume of the oil droplets suspended in CO2, and find the pressure point where the oil droplet volume reduction rate is equal to or just exceeds 15% in the interval of 600 seconds. This pressure point is considered to be MMP. The main advantage of ODVDA method over the previous methods is simple, time-saving, and more easily to conduct.