Research on Adaptability Evaluation Method of Polymer by Nuclear Magnetic Resonance Technology

In order to study the matching relationship between polymer(HPAM) molecular weight and reservoir permeability, in this paper, the injection performance of polymers with different molecular weights in rock cores with different permeability is studied. Using nuclear magnetic resonance technology combi...

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Bibliographic Details
Published in:Polymers 2023-02, Vol.15 (4), p.930
Main Authors: Wang, Xiaocong, Lei, Qun, Luo, Jianhui, Xiao, Peiwen, Wang, Pingmei, Ye, Yinzhu, Cong, Sunan, Han, Xue, He, Lipeng
Format: Article
Language:English
Subjects:
Enhanced oil recovery
Experiments
Flow velocity
Laws, regulations and rules
Magnetic permeability
Matching
Methods
Molecular weight
NMR
Nuclear magnetic resonance
Nuclear magnetic resonance spectroscopy
Permeability
Polymer flooding
Polymer industry
Polymers
Reservoirs
Swept volumes
Technology application
Viscosity
Water flooding
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Summary:In order to study the matching relationship between polymer(HPAM) molecular weight and reservoir permeability, in this paper, the injection performance of polymers with different molecular weights in rock cores with different permeability is studied. Using nuclear magnetic resonance technology combined with conventional core displacement equipment, the change law of the displacement process was analyzed from three aspects of nuclear magnetic resonance spectrum, core layering, and imaging. Finally, the fluidity of the polymer solution in the core was analyzed by injection pressure control features. The experimental results show that the polymer solution with a molecular weight of 25 million has the best retention effect in the core flooding experiment and can stay in the dominant channel of the core for a long time to control the water flooding mobility. In rocks with a permeability of 500, 1000, and 2000 mD, subsequent water flooding can expand the swept volume by about 25% compared with polymer flooding. This method can effectively establish the adaptability matching relationship between the polymer molecular weight and the reservoir permeability.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym15040930