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Study on Oil Recovery Mechanism of Polymer-Surfactant Flooding Using X-ray Microtomography and Integral Geometry.

Daigang Wang1, Yang Song1, Ping Wang2

  • 1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China.

Molecules (Basel, Switzerland)
|December 11, 2022
PubMed
Summary

Polymer-surfactant flooding refines remaining oil distribution in clastic reservoirs. This advanced method transforms large oil droplets into smaller, isolated forms, enhancing oil recovery potential.

Keywords:
chemical floodingintegral geometrymicro-CToil recovery mechanismpore-scale morphology

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Area of Science:

  • Petroleum Engineering
  • Reservoir Characterization
  • Enhanced Oil Recovery

Background:

  • Understanding pore-scale oil distribution is crucial for maximizing oil recovery.
  • Traditional water flooding has limitations in recovering residual oil.
  • Advanced chemical flooding techniques are needed for deeper oil tapping.

Purpose of the Study:

  • To investigate the pore-scale morphology and distribution of remaining oil.
  • To analyze the effectiveness of polymer-surfactant (P-S) flooding compared to water flooding.
  • To elucidate the mechanism of oil recovery enhancement by P-S flooding.

Main Methods:

  • High-resolution X-ray microtomography (micro-CT) for imaging.
  • X-ray CT image processing for 3D visualization of pore structure and fluid distribution.
  • Integral geometry for characterizing pore-scale morphology and oil distribution.

Main Results:

  • P-S flooding reduced the average diameter and topological connectivity of oil droplets.
  • Synergistic effects of polymer and surfactant stripped large oil droplets (>124.58 μm).
  • Oil morphology shifted from network-like to porous and isolated types post-P-S flooding.

Conclusions:

  • P-S flooding significantly alters remaining oil morphology at the pore scale.
  • The transformation to scattered, isolated oil enhances potential for further recovery.
  • This study provides insights into optimizing chemical flooding strategies for clastic reservoirs.