Comparison of the correlations of natural gas hydrate formation conditions

There are a variety of methods to predict the hydrate formation conditions. The correlation regressed by fitting the experimental data with numerical method is simple, practicable and convenient for engineering application. Five kinds of new correlations of natural gas hydrate formation conditions are cited in this paper, namely, Østergaard, Towler-Mokhatab, Ameripour, Bahadori-Vuthaluru and Zahedi-Karami-Yaghoobi. These methods extend the predicted range of the correlations, and can be applied in different conditions. To investigate the prediction performances of these five correlations for hydrocarbon fluid, they are compiled into computer programs. The optimal method is selected after comparing the results predicted with such programs. For hydrocarbon fluid, the comparative results of the predicted results and experimental data show that the prediction performance of Towler-Mokhatab is similar to that of Bahadori-Vuthaluru, and these two methods are better than other three methods.