Multiphase boundary of C16+ heavy n-alkanes and CO2 systems
N-eicosane, N-tetracosane, N-octacosane and N-dotriacontane, which are heavy n-alkanes, were selected to form binary systems with CO2. The bubble point pressures of each system were obtained through a series of constant component expansion (CCE) experiments. Variation laws and mechanisms of multipha...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2017-02-01
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| Series: | Petroleum Exploration and Development |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380417300137 |
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| author | Xiaolei LIU Jishun QIN Haishui HAN Shi LI Zemin JI |
| author_facet | Xiaolei LIU Jishun QIN Haishui HAN Shi LI Zemin JI |
| author_sort | Xiaolei LIU |
| collection | DOAJ |
| description | N-eicosane, N-tetracosane, N-octacosane and N-dotriacontane, which are heavy n-alkanes, were selected to form binary systems with CO2. The bubble point pressures of each system were obtained through a series of constant component expansion (CCE) experiments. Variation laws and mechanisms of multiphase boundary of heavy n-alkanes-CO2 systems were studied. As CO2 fraction increased, the bubble point pressure of heavy n-alkanes-CO2 systems increased greatly, and the bubble point pressure increased linearly with temperature. When CO2 molar fraction is less than 50%, the bubble point pressure of the heavy n-alkanes-CO2 systems decreased slightly with the increase of carbon number, and the decrease of pressure amplitude decreased with the decrease of CO2 mole fraction. When CO2 molar fraction was 75%, the bubble point pressure of different heavy n-alkane systems increased slightly with the increase of carbon number. When CO2 molar fraction was less than 50%, with the increase of the carbon number, the influence of temperature variation on the bubble point pressure of systems decreased. When CO2 molar fraction was equal to 75%, with the increase of the carbon number, the influence of temperature variation on the bubble point pressure of heavy n-alkanes-CO2 systems did not change. On the analysis of micro scale, the reason for variation laws above is that the long chains and large intermolecular interval of heavy n-alkane has ability to accommodate CO2 molecules and its chain is prone to twist. Key words: C16+ heavy n-alkanes, CO2, multiphase boundary, CCE experiment, bubble point pressure |
| first_indexed | 2024-12-17T05:18:16Z |
| format | Article |
| id | doaj.art-9053e78a28a1455a82b31ac3adc2dc79 |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-12-17T05:18:16Z |
| publishDate | 2017-02-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-9053e78a28a1455a82b31ac3adc2dc792022-12-21T22:02:03ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042017-02-01441105110Multiphase boundary of C16+ heavy n-alkanes and CO2 systemsXiaolei LIU0Jishun QIN1Haishui HAN2Shi LI3Zemin JI4Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China; PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China; Corresponding authorPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China; National Energy (Experiment) Research Centre of CCUS, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China; National Energy (Experiment) Research Centre of CCUS, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China; National Energy (Experiment) Research Centre of CCUS, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China; National Energy (Experiment) Research Centre of CCUS, Beijing 100083, ChinaN-eicosane, N-tetracosane, N-octacosane and N-dotriacontane, which are heavy n-alkanes, were selected to form binary systems with CO2. The bubble point pressures of each system were obtained through a series of constant component expansion (CCE) experiments. Variation laws and mechanisms of multiphase boundary of heavy n-alkanes-CO2 systems were studied. As CO2 fraction increased, the bubble point pressure of heavy n-alkanes-CO2 systems increased greatly, and the bubble point pressure increased linearly with temperature. When CO2 molar fraction is less than 50%, the bubble point pressure of the heavy n-alkanes-CO2 systems decreased slightly with the increase of carbon number, and the decrease of pressure amplitude decreased with the decrease of CO2 mole fraction. When CO2 molar fraction was 75%, the bubble point pressure of different heavy n-alkane systems increased slightly with the increase of carbon number. When CO2 molar fraction was less than 50%, with the increase of the carbon number, the influence of temperature variation on the bubble point pressure of systems decreased. When CO2 molar fraction was equal to 75%, with the increase of the carbon number, the influence of temperature variation on the bubble point pressure of heavy n-alkanes-CO2 systems did not change. On the analysis of micro scale, the reason for variation laws above is that the long chains and large intermolecular interval of heavy n-alkane has ability to accommodate CO2 molecules and its chain is prone to twist. Key words: C16+ heavy n-alkanes, CO2, multiphase boundary, CCE experiment, bubble point pressurehttp://www.sciencedirect.com/science/article/pii/S1876380417300137 |
| spellingShingle | Xiaolei LIU Jishun QIN Haishui HAN Shi LI Zemin JI Multiphase boundary of C16+ heavy n-alkanes and CO2 systems Petroleum Exploration and Development |
| title | Multiphase boundary of C16+ heavy n-alkanes and CO2 systems |
| title_full | Multiphase boundary of C16+ heavy n-alkanes and CO2 systems |
| title_fullStr | Multiphase boundary of C16+ heavy n-alkanes and CO2 systems |
| title_full_unstemmed | Multiphase boundary of C16+ heavy n-alkanes and CO2 systems |
| title_short | Multiphase boundary of C16+ heavy n-alkanes and CO2 systems |
| title_sort | multiphase boundary of c16 heavy n alkanes and co2 systems |
| url | http://www.sciencedirect.com/science/article/pii/S1876380417300137 |
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