Abstract: In the absence of the experimentally measured bubble-point pressure, it is necessary for the engineer to make an estimate of this crude oil property from the readily available measured producing parameters. Several authors have proposed graphical and mathematical correlations for determining the bubble point pressure. They presented their correlations based on the assumption that the bubble-point pressure is a strong function of solution gas-oil ratio, gas gravity, oil gravity, and temperature. This paper presents a comparison study among 23 different correlations used to calculate the bubble point pressure for 441 sample of Middle East crude oil. A new correlation was developed for calculating the bubble point with correlation coefficient of 0.98.

Keywords: Bubble point pressure, Gas specific gravity, Solution GOR, Reservoir temperature, API.