Identification of distinctions of immiscible CO2 huff and puff performance in Chang-7 tight sandstone oil reservoir by applying NMR, microscope and reservoir simulation
文献类型：期刊论文
| 作者 | Luo, Yongcheng2,3,4; Zheng, Taiyi1,4; Xiao, Hanmin2,3; Liu, Xiangui2,3; Zhang, Haiqin2; Wu, Zhenkai2,3,4; Zhao, Xinli2,3,4; Xia, Debin4 |
| 刊名 | JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
 |
| 出版日期 | 2022-02-01 |
| 卷号 | 209页码:11 |
| 关键词 | CO 2 huff and puff Nuclear magnetic resonance Residual oil distribution Molecular diffusion Asphaltene precipitation |
| ISSN号 | 0920-4105 |
| DOI | 10.1016/j.petrol.2021.109719 |
| 通讯作者 | Luo, Yongcheng(luoyongcheng18@mails.ucas.ac.cn) |
| 英文摘要 | CO2 huff and puff (HNP) is one of the most effective methods to improve tight oil recovery after the primary depletion process. The seepage mechanisms between CO2 and crude oil are complicated in porous media during CO2 HNP process. Therefore, in this paper, the CO2 HNP process of Chang-7 tight oil reservoir, Ordos Basin, China, was studied by nuclear magnetic resonance (NMR) technology, microscopic observation and numerical simulation. Experimentally, using NMR technology and microscopy methods, the distribution characteristics of residual oil during CO2 HNP process were measured intuitively. Numerically, a group of core-scale and field-scale simulations considering molecular diffusion and asphaltene precipitation were established to further verify and elongate the experimental results. The results show that at the initial state, the crude oil in the tight core was mainly distributed in nanopores, sub-micro-nanopores and sub-micropores, where the oil content exceeded at least 73% in these pores. During CO2 HNP process, the oil recovery was more pronounced for the 1st and 2nd rounds than for 3rd to 5th rounds. Notably, even if the cores with more nano-pores were more favorable for the 4-5th CO2 HNP rounds, the oil molecules in nanopores were still difficult to be available. Moreover, the CO2 sweep scope could be divided into displacement affected region and diffusion affected region. CO2 could effectively drive the crude oil in the displacement affected region. While the oil could be successfully displaced by dissolved gas flooding in the diffusion affected region only under the appropriate conditions. Meanwhile, the core-scale numerical models confirmed that it was necessary to consider molecular diffusion and asphaltene precipitation factors, which would make the simulation results in line with the experiment. In terms of the ultimate oil recovery, the field-scale model only considering the diffusion (2.456%) > the model both considering the diffusion and asphaltene (2.436%) > the model without considering the diffusion and asphaltene deposition (2.412%) > the model only considering the asphaltene deposition (2.388%). |
| WOS关键词 | N-PUFF |
| 资助项目 | CNPC basic advanced reserve technology[2021DJ2201] ; Natural Science Foundation of Chongqing[cstc2020jcyjmsxmX0216] ; Bayu Scholars Program |
| WOS研究方向 | Energy & Fuels ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000731082300003 |
| 资助机构 | CNPC basic advanced reserve technology ; Natural Science Foundation of Chongqing ; Bayu Scholars Program |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/88169]  |
| 专题 | 力学研究所_流固耦合系统力学重点实验室(2012-) |
| 通讯作者 | Luo, Yongcheng |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China 2.Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 3.Univ Chinese Acad Sci, Inst Porous Flow & Fluid Mech, Langfang 065007, Peoples R China 4.Univ Chinese Acad Sci, Coll Engn Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo, Yongcheng,Zheng, Taiyi,Xiao, Hanmin,et al. Identification of distinctions of immiscible CO2 huff and puff performance in Chang-7 tight sandstone oil reservoir by applying NMR, microscope and reservoir simulation[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2022,209:11. |
| APA | Luo, Yongcheng.,Zheng, Taiyi.,Xiao, Hanmin.,Liu, Xiangui.,Zhang, Haiqin.,...&Xia, Debin.(2022).Identification of distinctions of immiscible CO2 huff and puff performance in Chang-7 tight sandstone oil reservoir by applying NMR, microscope and reservoir simulation.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,209,11. |
| MLA | Luo, Yongcheng,et al."Identification of distinctions of immiscible CO2 huff and puff performance in Chang-7 tight sandstone oil reservoir by applying NMR, microscope and reservoir simulation".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 209(2022):11. |
入库方式： OAI收割
来源：力学研究所
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