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| 修正混合规则的BWRS型状态方程及其在CO2-原油体系相态计算中的应用 |
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廉黎明1,2,秦积舜1,2,刘同敬3,李实1,2,姬泽敏1,2,第五鹏翔4
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(1.中国石油勘探开发研究院 提高石油采收率国家重点实验室,北京 100083;2.国家能源二氧化碳驱油与埋存技术研发(实验)中心,北京 100083;3.中国石油大学 提高采收率研究中心,北京 102249;4.中国地质大学 能源学院,北京 100083)
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| 摘要: |
| CO2-原油体系中含有非烃和较多重组分,非理想性较强。以对非理想体系有较好计算效果的BWRS状态方程为基础,考虑温压条件和组分间的相互作用,修正混合规则,使其更加适用于CO2-原油体系的相态计算,提高方程的预测精度。应用油田现场油样实测气液相组分数据,以三参数PR和PT方程的计算均值代表常用状态方程,分别采用基于修正混合规则的BWRS方程和常用状态方程对油气组分和密度等参数进行计算。结果表明:修正混合规则的BWRS方程中各混合参数都可还原为维里系数对组分的依赖形式,理论性更强;方程计算精度显著提高,对非烃类气体和重组分有较好的适应性,能满足工程应用要求。 |
| 关键词: CO2-原油体系 BWRS状态方程 混合规则 逸度计算 |
| DOI：10.3969/j.issn.1673-5005.2013.02.014 |
| 分类号::TE 357.7 |
| 基金项目:国家“973计划”课题(2011CB707304) |
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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 |
