Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirs
Abstract In order to determine the influence of different factors on the CO2 huff-and-puff displacement effect, a CO2 huff-and-puff experiment was carried out with Chang 6 tight sandstone samples in Ordos Basin as the research object. Combined with nuclear magnetic resonance technology, the influenc...
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Nature Portfolio
2025-01-01
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| author | Zhe Zhang Jian Sun Zhihao Niu Zhilin Tuo Xinyu Zhong Xiaolei Zheng Rongjun Zhang |
| author_facet | Zhe Zhang Jian Sun Zhihao Niu Zhilin Tuo Xinyu Zhong Xiaolei Zheng Rongjun Zhang |
| author_sort | Zhe Zhang |
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| description | Abstract In order to determine the influence of different factors on the CO2 huff-and-puff displacement effect, a CO2 huff-and-puff experiment was carried out with Chang 6 tight sandstone samples in Ordos Basin as the research object. Combined with nuclear magnetic resonance technology, the influences of injection pressure, cycle numbers and soaking time on the CO2 huff-and-puff effect were evaluated, and the optimal CO2 huff-and-puff parameters were optimized. The microscopic degree of crude oil production in different scale pores was quantitatively characterized. The results show that the injection pressure and the cycle numbers have a significant influence on the effect of CO2 huff-and-puff. With the increase of injection pressure, huff-and-puff cycle numbers and soaking time, the recovery efficiency increases, but the growth range decreases. When the injection pressure is increased from 6 to 12MPa, the degree of pore mobilization in the oil in macro and medium pores (≥ 10ms) increases by 13.0%-22.63%. The recovery efficiency of a single round gradually decreased with the increase of huff-and-puff rounds. The first cycle of CO2 huff-and-puff was the main contribution of crude oil recovery. However, the production effect of micro and small pores (< 10ms) was significantly improved after multiple cycle numbers of CO2 huff-and-puff. When the soaking time increases from 6 to 24h, the recovery efficiency increases by 11.47%-14.93%. After that, the influence of prolonged soaking time on the porosity production degree of cores with different permeability decreases. It is found that medium pores and macro pores are the main contributors to pore mobilization during multiple cycles of CO2 huff-and-puff. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj-art-48873e9033034452b25607f3f264fafa2025-02-02T12:23:15ZengNature PortfolioScientific Reports2045-23222025-01-0115111110.1038/s41598-025-87846-3Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirsZhe Zhang0Jian Sun1Zhihao Niu2Zhilin Tuo3Xinyu Zhong4Xiaolei Zheng5Rongjun Zhang6School of Petroleum Engineering, Xi ‘an Shiyou UniversitySchool of Petroleum Engineering, Xi ‘an Shiyou UniversitySINOPEC Northwest Oilfield CompanyPetroChina Changqing Oilfield Company, PetroChinaXi’an Key Laboratory of Tight Oil (Shale Oil) Development (Xi’an Shiyou University)School of Earth Sciences and Engineering, Xi’an Shiyou UniversitySchool of Petroleum Engineering, Xi ‘an Shiyou UniversityAbstract In order to determine the influence of different factors on the CO2 huff-and-puff displacement effect, a CO2 huff-and-puff experiment was carried out with Chang 6 tight sandstone samples in Ordos Basin as the research object. Combined with nuclear magnetic resonance technology, the influences of injection pressure, cycle numbers and soaking time on the CO2 huff-and-puff effect were evaluated, and the optimal CO2 huff-and-puff parameters were optimized. The microscopic degree of crude oil production in different scale pores was quantitatively characterized. The results show that the injection pressure and the cycle numbers have a significant influence on the effect of CO2 huff-and-puff. With the increase of injection pressure, huff-and-puff cycle numbers and soaking time, the recovery efficiency increases, but the growth range decreases. When the injection pressure is increased from 6 to 12MPa, the degree of pore mobilization in the oil in macro and medium pores (≥ 10ms) increases by 13.0%-22.63%. The recovery efficiency of a single round gradually decreased with the increase of huff-and-puff rounds. The first cycle of CO2 huff-and-puff was the main contribution of crude oil recovery. However, the production effect of micro and small pores (< 10ms) was significantly improved after multiple cycle numbers of CO2 huff-and-puff. When the soaking time increases from 6 to 24h, the recovery efficiency increases by 11.47%-14.93%. After that, the influence of prolonged soaking time on the porosity production degree of cores with different permeability decreases. It is found that medium pores and macro pores are the main contributors to pore mobilization during multiple cycles of CO2 huff-and-puff.https://doi.org/10.1038/s41598-025-87846-3Tight sandstone reservoirsInjection pressureCO2 huff-and-puff cycle numbersSoaking timePore production law |
| spellingShingle | Zhe Zhang Jian Sun Zhihao Niu Zhilin Tuo Xinyu Zhong Xiaolei Zheng Rongjun Zhang Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirs Scientific Reports Tight sandstone reservoirs Injection pressure CO2 huff-and-puff cycle numbers Soaking time Pore production law |
| title | Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirs |
| title_full | Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirs |
| title_fullStr | Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirs |
| title_full_unstemmed | Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirs |
| title_short | Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirs |
| title_sort | experimental study on the influencing factors and pore production law of co2 huff and puff in tight sandstone reservoirs |
| topic | Tight sandstone reservoirs Injection pressure CO2 huff-and-puff cycle numbers Soaking time Pore production law |
| url | https://doi.org/10.1038/s41598-025-87846-3 |
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