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Prediction of the viscosity of natural gas at high temperature and high pressure using free-volume theory and entropy scaling

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Petroleum Science 2023年第5期20卷 3210-3222页

作者： Wei Xiong Lie-Hui Zhang Yu-Long Zhao Qiu-Yun Hu Ye Tian Xiao He Rui-Han Zhang Tao Zhang National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan610500China Engineering Technology Research Institute Southwest Oil and Gas Field CompanyChengduSichuan610031China PetroChina Southwest Oil&Gasfield Company ChengduSichuan610051China

Eighteen models based on two equations of state(EoS),three viscosity models,and four mixing rules were constructed to predict the viscosities of natural gases at high temperature and high pressure(HTHP)*** pure substances,the parameters of free volume(FV)and entropy scaling(ES)models were found to scale with molecular weight,which indicates that the ordered behavior of parameters of Peng-Robinson(PR)and Perturbed-Chain Statistical Associating Fluid Theory(PC-SAFT)propagates to the behavior of parameters of viscosity *** the viscosities of natural gases showed that the FV and ES models respectively combined with MIX4 and MIX2 mixing rules produced the best ***,the FV models were more accurate for predicting the viscosities of natural gases than ES models at HTHP conditions,while the ES models were superior to PRFT *** average absolute relative deviations of the best accurate three models,i.e.,PC-SAFT-FV-MIX4,tPR-FVMIX4,and PC-SAFT-ES-MIX2,were 5.66%,6.27%,and 6.50%,respectively,which was available for industrial *** with the existing industrial models(corresponding states theory and LBC),the proposed three models were more accurate for modeling the viscosity of natural gas,including gas condensate.

关键词： Viscosity Friction theory Free volume theory entropy scaling PC-SAFT Equation of state

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