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1 Polish Journal of Chemistry

1 2006

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Numerical Algorithms for Determination of Retrograde Region of Gas Condensate Reservoir

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Tarom N. , Jalali F. , Al-Sayegh A. , Moshfeghian M.

Polish Journal of Chemistry

2006

tom Vol. 80, nr 1

51-64

Twomathematical algorithms based on a cubic EOS are developed to determine the retrograde region for reservoir fluids. The first method is based on marching and the second one utilizes regression analysis. In marching method, a series of flash calculations is performed to calculate maximum L/F (moles of liquid/moles of feed). In the regression method, a non-linear regression and an optimizationmethod in addition to a limited number of flash calculations are used to determine the maximum L/F. Based on these mathematical algorithms a computer program to predict a full phase envelope containing the retrograde curve was developed. The computer program consists of three basic parts of bubble point, dew point, and flash calculations. These three basic parts are used to determine the retrograde region. In the course of determination of the retrograde condensation region, the coordinates of critical point and cricondentherm point were also determined and used to speed up the search method. Several cases were studied and it was found that the regression method is faster and more accurate.