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| Petroleum fluids such as the gas condensate and crude oil system often contain large concentrations of high molecular constituents. When determining the physicochemical properties and phase behavior of petroleum fluids by equations of state, the hydrocarbon heavy fractions should be properly characterized. Although advanced gas chromatographs can be used to analyze the fluid composition, the simple structure molar distribution models are still convenient to characterize the heavy hydrocarbon fractions so that time and money will be saved. To accurately split the plus fraction into a series of single carbon numbers (SCN), generating the mole fraction and the respective molecular weight, an improved six-coefficient splitting model is presented in this study. The model is based on the relationships between the six-coefficient molar distribution function, experimental mole fraction, average molecular weight and SCN data acquired from the literature. The presented model was validated by using the experimental extended fluid component of 20 different petroleum fluids which cover gas condensates and crude oils. The comparison results of the model and four other splitting approaches as Katz method, Pedersen et al. method, Ahmed et al. method and Hosein et al. method, indicate that the improved method is more practical and appropriate for extending different types of petroleum fluids. |
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| Keywords:petroleum fluid; molar distribution model; plus fraction; splitting method; single carbon number |
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