Assessment of the PVT correlations for predicting the properties of Kuwaiti crude oils

Several correlations have been proposed for determining PVT properties. Limitations concerning the validity of these correlations for different types of hydrocarbon systems, accuracy, range of applicability, corrections for non-hydrocarbons contents, etc., have been controversial. e crude oils from different regions have different properties, it is recommended to assess the accuracy of the available correlations. esent study is concerned with the assessment of these correlations for a variety of oils from Kuwaiti fields. The study evaluated recently developed correlations in the Middle East region and the Arabian Gulf as well as those most often used. The limitations of these correlations have been analyzed. Forty-four individual crude oil samples from Kuwaiti oil fields were used in this study. Corrections due to the presence of non-hydrocarbon gases, adjustment to oil composition, and correction of gas gravity to common separation conditions were taken into consideration. It was found that Standingʹs correlation showed the best accuracy for predicting the bubble-point pressure among all others, though such accuracy is beyond desirable engineering limits. All the correlations examined in the present study showed a comparable accuracy in predicting OFVF at the bubble point with Al-Marhounʹs correlation having the least deviation.