Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay Shale
AbstractDuvernay shale spans over 6 million acres with a total resource of 440 billion barrels’ oil equivalent in the Western Canada Sedimentary Basin (WCSB). The oil recovery factors typically decrease with the decreasing of gas-oil ratio (GOR) in oil window of Duvernay shale. The v...
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| Format: | Article |
| Language: | English |
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GeoScienceWorld
2022-07-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2012/5261253/615821/Phase-Behavior-in-Nanopores-and-Its-Indication-for |
| _version_ | 1811177441921597440 |
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| author | Xiangwen Kong Hongjun Wang Wei Yu Ping Wang Li Liu Wenjing Zhang |
| author_facet | Xiangwen Kong Hongjun Wang Wei Yu Ping Wang Li Liu Wenjing Zhang |
| author_sort | Xiangwen Kong |
| collection | DOAJ |
| description |
AbstractDuvernay shale spans over 6 million acres with a total resource of 440 billion barrels’ oil equivalent in the Western Canada Sedimentary Basin (WCSB). The oil recovery factors typically decrease with the decreasing of gas-oil ratio (GOR) in oil window of Duvernay shale. The volatile oil recovery factors are typically 5–10%. Enhanced oil recovery technologies should be applied to improve the economics of the reservoirs. In this paper, the volatile oil from the Duvernay shale was taken as an example for phase behavior study. We analyzed the nanopore confinement on phase behavior and physical properties of Duvernay shale oil. The shift of critical properties was quantified within nanopores. With the confinement of nanopores, the viscosity, density, and bubble point pressure of the oil decrease with the shrinking of the pore size. Minimum miscibility pressure (MMP) was calculated for different injected gases. The MMP from high to low is N2>CH4>lean gas>rich gas>CO2. In the case of injecting the same gas component, the MMP decreases as the pore size decreases. The wellhead rich gas is suggested to be the main gas source for gas injection in Duvernay shale. The formation pressure should be rapidly increased to the MMP and maintained close to it, which would help to improve the effect of gas injection and enhance shale oil recovery. This paper can provide critical insights for the research of shale oil gas injection for enhanced oil recovery. |
| first_indexed | 2024-04-11T06:03:03Z |
| format | Article |
| id | doaj.art-6a7ea939368f430ba2b5044fde32c2ca |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-11T06:03:03Z |
| publishDate | 2022-07-01 |
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| series | Lithosphere |
| spelling | doaj.art-6a7ea939368f430ba2b5044fde32c2ca2022-12-22T04:41:36ZengGeoScienceWorldLithosphere1941-82641947-42532022-07-012022Special 1210.2113/2022/5261253Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay ShaleXiangwen Kong0http://orcid.org/0000-0001-7722-7500Hongjun Wang1Wei Yu2Ping Wang3Li Liu4Wenjing Zhang51 Research Institute of Petroleum Exploration and Development Beijing 100083 China cnpc.com.cn1 Research Institute of Petroleum Exploration and Development Beijing 100083 China cnpc.com.cn2 The University of Texas at Austin Austin TX 78712 USA utexas.edu1 Research Institute of Petroleum Exploration and Development Beijing 100083 China cnpc.com.cn1 Research Institute of Petroleum Exploration and Development Beijing 100083 China cnpc.com.cn3 Beijing Offcn Education & Technology Co. Ltd. Beijing 100083 China AbstractDuvernay shale spans over 6 million acres with a total resource of 440 billion barrels’ oil equivalent in the Western Canada Sedimentary Basin (WCSB). The oil recovery factors typically decrease with the decreasing of gas-oil ratio (GOR) in oil window of Duvernay shale. The volatile oil recovery factors are typically 5–10%. Enhanced oil recovery technologies should be applied to improve the economics of the reservoirs. In this paper, the volatile oil from the Duvernay shale was taken as an example for phase behavior study. We analyzed the nanopore confinement on phase behavior and physical properties of Duvernay shale oil. The shift of critical properties was quantified within nanopores. With the confinement of nanopores, the viscosity, density, and bubble point pressure of the oil decrease with the shrinking of the pore size. Minimum miscibility pressure (MMP) was calculated for different injected gases. The MMP from high to low is N2>CH4>lean gas>rich gas>CO2. In the case of injecting the same gas component, the MMP decreases as the pore size decreases. The wellhead rich gas is suggested to be the main gas source for gas injection in Duvernay shale. The formation pressure should be rapidly increased to the MMP and maintained close to it, which would help to improve the effect of gas injection and enhance shale oil recovery. This paper can provide critical insights for the research of shale oil gas injection for enhanced oil recovery.https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2012/5261253/615821/Phase-Behavior-in-Nanopores-and-Its-Indication-for |
| spellingShingle | Xiangwen Kong Hongjun Wang Wei Yu Ping Wang Li Liu Wenjing Zhang Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay Shale Lithosphere |
| title | Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay Shale |
| title_full | Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay Shale |
| title_fullStr | Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay Shale |
| title_full_unstemmed | Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay Shale |
| title_short | Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay Shale |
| title_sort | phase behavior in nanopores and its indication for cyclic gas injection in a volatile oil reservoir from duvernay shale |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2012/5261253/615821/Phase-Behavior-in-Nanopores-and-Its-Indication-for |
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