What question did this study set out to answer?

To evaluate how reservoir permeability and rock heterogeneity influence oil displacement efficiency and remaining oil distribution during sequential water and chemical flooding.

March 29, 2023Open Access

The influence of permeability and heterogeneity on water flooding–chemical flooding efficiency and remaining oil distribution ——Based on nuclear magnetic resonance displacement imaging

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Authors

YZYang ZhangSinopec (China)CGChangcheng GaiResearch Institute of Petroleum Exploration and Development BSBinghui SongResearch Institute of Petroleum Exploration and Development

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Implication

Experimental study reveals that higher permeability and polymer-surfactant flooding enhance oil recovery in core samples, suggesting targeted chemical strategies improve extraction in mature fields.

Key Points

To evaluate how reservoir permeability and rock heterogeneity influence oil displacement efficiency and remaining oil distribution during sequential water and chemical flooding.
Characterized three groups of high- and ultrahigh-permeability core samples from a mature oilfield using high-pressure mercury injection, scanning electron microscopy, and wettability analysis.
Conducted six groups of nuclear magnetic resonance (NMR) displacement imaging experiments to track dynamic oil distribution during water flooding, polymer flooding, and polymer-surfactant flooding.
Oil displacement efficiency showed the greatest gains during two intervals: initial flooding up to 50% water cut and secondary flooding from 95% water cut to the end of 1 pore volume polymer injection, primarily mobilizing oil from pore throats larger than 8.37 µm.
Polymer-surfactant binary flooding achieved higher final recovery efficiency than polymer flooding alone, demonstrating the greatest performance gains in samples with higher permeability.
Greater reservoir heterogeneity intensified viscous fingering and caused remaining oil to concentrate at the outlet end and top of the samples, whereas lower heterogeneity produced more uniform oil saturation.

Cite This Study

Zhang et al. (2023) studied this question.

synapsesocial.com/papers/6a8ac7e82372d24d7cfb360d https://doi.org/10.21203/rs.3.rs-2716260/v1

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Implication

Experimental study reveals that higher permeability and polymer-surfactant flooding enhance oil recovery in core samples, suggesting targeted chemical strategies improve extraction in mature fields.

The influence of permeability and heterogeneity on water flooding–chemical flooding efficiency and remaining oil distribution ——Based on nuclear magnetic resonance displacement imaging

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Implication

Key Points

Cite This Study

The influence of permeability and heterogeneity on water flooding–chemical flooding efficiency and remaining oil distribution ——Based on nuclear magnetic resonance displacement imaging

Discussion

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Implication

Key Points

Cite This Study

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