Experimental investigations of oil flow under pressure below bubble point pressure

The article considers the features of live oil flow investigation under pressure below bubble point pressure and the methodology for performing special core analysis. Attention is focused on the technical and methodological aspects of the experimental studies: requirements for laboratory equipment, design of experiments, preparation of recombined oil samples, interpretation and analysis of the experimental results. The experiments were carried out for two lithotypes of reservoir rocks on elongated core models (84 cm) using a recombined model of reservoir oil with a GOR ≈ 50 m 3 /m 3 and a bubble point pressure ≈ 80 bar. Based on the research results, inflow curves of core models were obtained for outlet pressure range from 30 to 70 bar. A decrease in the productivity coefficient due to the two-phase of oil and gas flow occurrence was estimated. The results of the experimental studies were analyzed taking into account theoretical concepts of investigated processes.