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Wettability effect on oil recovery using rock-structured microfluidics.

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Altering surface wettability significantly boosts oil recovery. Hydrophilic rock surfaces enhance oil recovery by approximately 44% compared to hydrophobic ones, improving sweep efficiency in enhanced oil recovery (EOR) applications.

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Area of Science:

  • Petroleum Engineering
  • Surface Science
  • Microfluidics

Background:

  • Surface wettability influences critical phenomena like fluid displacement and microfluidic applications.
  • Enhanced oil recovery (EOR) is vital for maximizing hydrocarbon extraction from reservoirs.

Purpose of the Study:

  • To investigate the impact of matrix wettability on oil displacement and sweep efficiency in sandstone-like microfluidic models.
  • To compare the performance of aqueous floods in hydrophilic versus hydrophobic microfluidic environments for EOR.

Main Methods:

  • Utilizing microfluidic chips with sandstone-like porous structures.
  • Conducting systematic experiments with viscous oil and aqueous floods on both hydrophilic and hydrophobic chip surfaces.
  • Employing scaling analysis incorporating contact angle to explain observed recovery rates.

Main Results:

  • Hydrophilic microfluidic rocks demonstrated a significant increase in oil recovery (≈1.44 times) compared to hydrophobic ones.
  • A more pronounced lateral growth of the displacing aqueous front was observed on hydrophilic surfaces.
  • Contact angle was quantitatively correlated with increased recovery rates and finger width.

Conclusions:

  • Matrix wettability is a critical factor controlling fluid displacement efficiency in porous media.
  • Hydrophilic surfaces are more effective for aqueous flooding in EOR applications, leading to higher oil recovery.
  • The findings provide a quantitative basis for optimizing wettability in EOR strategies.