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

作　　者：Wei Xiong Lie-Hui Zhang Yu-Long Zhao Qiu-Yun Hu Ye Tian Xiao He Rui-Han Zhang Tao Zhang 

机构地区：[1]National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan,610500,China [2]Engineering Technology Research Institute,Southwest Oil and Gas Field Company,Chengdu,Sichuan,610031,China [3]PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan,610051,China

出　　处：《Petroleum Science》2023年第5期3210-3222,共13页石油科学（英文版）

基　　金：supported by the China Scholarship Council(No.202209225014);National Science Fund for Excellent Young Scholars(Grant No.52222402);National Natural Science Foundation of China(Grant No.52234003);National Natural Science Foundation of China(Grant No.52074235);National Science and Technology Major Project of China during the 13th Five-Year Plan Period(2016ZX05062);Sichuan Science and Technology Program(Grant No.2021YJ0345);National Natural Science Foundation of China(Grant No.51874251,51774243,52174036,and 51704247);Sichuan Science and Technology Program(NO.2022JDJQ0009);shale gas industry development Institute of Sichuan province,International S&T Cooperation Program of Sichuan Province(Grant No.2019YFH0169);the Deep Marine shale gas efficient development Overseas Expertise Introduction Center for Discipline Innovation(111 Center);Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance(No.2020CX020202,2020CX030202).

摘　　要：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)conditions.For 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 model.Predicting the viscosities of natural gases showed that the FV and ES models respectively combined with MIX4 and MIX2 mixing rules produced the best accuracy.Moreover,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 models.The 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 production.Compared 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 

分 类 号：TE934.2[石油与天然气工程—石油机械设备]