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| A BWRS type EOS based on modified mixing-rule and its application in phase behavior of CO2-crude system |
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LIAN Li-ming1,2, QIN Ji-shun1,2, LIU Tong-jing3, LI Shi1,2, JI Ze-min1,2, DIWU Peng-xiang4
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(1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;2.State Key Laboratory of Enhanced Oil Recovery ＆ National Energy (Experiment) Research Centre of CCUS, Beijing 100083, China;3.Enhanced Oil Recovery Research Centre in China University of Petroleum, Beijing 102249, China;4.School of Energy Resources in China University of Geosciences, Beijing 100083, China)
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| Abstract: |
| CO2-crude systems are rich in non-hydrocarbon gases and are typical non-ideal systems at conditions of high pressure and high temperature in reservoirs. BWRS-EOS well applied in non-ideal system was chosen,\ as basement, and the mixing-rules of the EOS was modified to establish a new calculation method suitable for phase behavior of CO2-crude system. With the insitu petroleum samples data of vapor and liquid phase components from actual measurement, the calculation precision was compared between the components and density parameters by the new method and the common EOS. The results show that this method could be revised to the dependency relationship of virial coefficients which means a theoretical strictness. The accuracy of the equation is improved significantly. It is suitable for nonhydrocarbon gas and heavy constituent and can meet the industrial requirement. |
| Key words: CO2-crude system BWRS equation of state mixing-rules fugacity calculation |
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