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CO2/N2-Responsive Nanoparticles for Enhanced Oil Recovery During CO2 Flooding.

Nanjun Lai1,2,3, Qingru Zhu1,3, Dongyu Qiao4

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|June 9, 2020
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Responsive nanoparticles effectively control gas channeling in ultra-low permeability reservoirs. This method enhances oil recovery by over 26% and improves rock wettability.

Keywords:
CO2 floodingenhanced oil recoverymobility controlpluggingresponsive nano-SiO2

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Area of Science:

  • Petroleum Engineering
  • Materials Science

Background:

  • Carbon dioxide (CO2) flooding in ultra-low permeability reservoirs suffers from gas channeling due to CO2's high mobility.
  • Effective mobility control is crucial for enhancing oil recovery in these challenging formations.

Purpose of the Study:

  • To develop and evaluate responsive nanoparticles for CO2 mobility control.
  • To assess the nanoparticles' performance in enhancing oil recovery and altering reservoir wettability.

Main Methods:

  • Responsive nanoparticles were synthesized by modifying nano-silica (SiO2) using 3-aminopropyltrimethoxysilane (KH540).
  • Characterization included FT-IR, 1H-NMR, TEM, and DLS; performance was tested via CO2/N2 response, wettability tests, plugging experiments, and core flooding.

Main Results:

  • The synthesized nanoparticles demonstrated responsiveness, controlling dispersity via electrostatic interactions.
  • Achieved a 93.3% plugging capacity for CO2 mobility control, leading to over 26% additional oil recovery.
  • Successfully reverted oil-wet rock surfaces to water-wet through surface adsorption.

Conclusions:

  • Responsive nanoparticles show significant potential for mobility control in CO2 flooding.
  • These nanoparticles offer a promising solution for improved oil recovery in ultra-low permeability reservoirs.
  • The wettability alteration capability further enhances their applicability in enhanced oil recovery operations.