A New Correlation for Undersaturated Isothermal Oil Compressibility
- Muhammad Ali Al-Marhoun (King Fahd U. of Petroleum and Minerals)
- Document ID
- Society of Petroleum Engineers
- Publication Date
- Document Type
- 2006. Society of Petroleum Engineers
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The author has revised one of the correlations in his paper TheCoefficient of Isothermal Compressibility of Black Oils, SPE 81432,presented at the SPE Middle East Oil Show and Conference, Bahrain, 9-12 June,2003. This paper summarizes the author's revised correlation. Thispaper has not been peer reviewed. The author submitted this change forinclusion in the eLibrary.
This article presents a new correlation for the coefficient of isothermalcompressibility of black oils at pressures above the bubblepoint. Thecorrelation is expressed as an empirical function of oil relative density atbubblepoint pressure, reservoir temperature, bubblepoint pressure, andreservoir pressure. The current empirical correlations give different resultsdepending on the conditions of the separator test, which depend on the numberof separator stages and the separator pressure and temperature. The newcorrelation is a function of oil properties that do not depend onseparator-test data. Therefore, the new correlation gives a unique resultregardless of the separator conditions.
A total of 3,412 data points from 186 laboratory PVT analyses from MiddleEast fields were used to develop the oil compressibility correlation. The dataencompassed a wide range of gas/oil ratios, oil and gas relative densities,reservoir pressure, and reservoir temperature.
The correlation is validated by using three different data sets from othergeographical regions not used in the development of the correlation.
The newly developed correlation outperforms the existing correlations foroil compressibility based on the low value of average absolute percent relativeerror.
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