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20251011232535.0 |
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251011s2025 xx |||||o 00| ||eng c |
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|a 10.1002/mrc.70053
|2 doi
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|a pubmed25n1596.xml
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|a (NLM)41074719
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Wang, Weidong
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Quantitative Study on the Blockage Degree of Pores Due to Asphaltene Precipitation During CO2 Flooding in Tight Reservoirs With NMR
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|c 2025
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 11.10.2025
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|a published: Print-Electronic
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|a Citation Status Publisher
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|a © 2025 John Wiley & Sons Ltd.
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|a CO2 flooding is commonly employed for enhanced oil recovery in tight reservoirs. However, asphaltene deposition-induced pore blockage occurs during injection. Conventional studies primarily neglect pore-scale impairment mechanisms. To accurately characterize asphaltene precipitation patterns and quantify microscopic pore blockage, this study integrates static miscibility experiments with dynamic flooding tests. The methodology investigates parametric influences on asphaltene precipitation volumes, evaluates deposition dynamics across pore-size distributions, and employs NMR to quantify pore blockage ratios. Experimental results demonstrated that the Chang-8 Block crude oil in the Ordos Basin exhibited a minimum miscibility pressure (MMP) of 18.58 MPa at 60°C, with the system being identified as asphaltene-unstable. Post-CO2 miscibility, asphaltene precipitation increases progressively with both rising temperature and pressure, reaching maximum escalation rates at pressures approaching the MMP. However, this escalation rate moderated when pressure exceeded the MMP. Formation damage and pore blockage ratios increased progressively with CO2 injection volumes, reaching 14.27% at 6 PV. Initial blockage occurred preferentially in macropores, followed by concurrent impairment in both macropores and micropores. Elevated displacement temperatures enhanced CO2 dissolution. Below CO2 critical conditions (T > 31.6°C, p > 7.38 MPa), limited displacement efficiency resulted in macropore blockage. Upon exceeding the critical temperature, pore blockage escalation intensified, achieving 25.22% at 60°C. This study systematically investigates asphaltene precipitation characteristics within tight reservoir cores during CO2 flooding, clarifies the precipitation law of asphaltene in the core under the influence of different factors, and provides operational guidelines for enhancing recovery efficiency and optimizing field-scale CO2 injection strategies in tight reservoirs
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4 |
|a Journal Article
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4 |
|a CO2 flooding
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| 650 |
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4 |
|a asphaltene precipitation
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| 650 |
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4 |
|a low‐field NMR
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| 650 |
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4 |
|a tight reservoirs
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| 700 |
1 |
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|a Huang, Weian
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Sang, Qian
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Lv, Wei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Sun, Junteng
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yang, Zhihong
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Magnetic resonance in chemistry : MRC
|d 1985
|g (2025) vom: 11. Okt.
|w (DE-627)NLM098179667
|x 1097-458X
|7 nnas
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| 773 |
1 |
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|g year:2025
|g day:11
|g month:10
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| 856 |
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|u http://dx.doi.org/10.1002/mrc.70053
|3 Volltext
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