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This study classified deep formation pore types using high-pressure mercury injection (HPMI) and nuclear magnetic resonance (NMR). It quantifies oil mobilization during CO2 huff-n-puff, guiding tight oil reservoir applications.

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Area of Science:

  • Petroleum Engineering
  • Geoscience
  • Reservoir Engineering

Background:

  • Deeply buried formations present challenges in characterizing pore types.
  • Understanding crude oil behavior under CO2 injection is crucial for enhanced oil recovery.
  • CO2 huff-n-puff is a key technology for mobilizing oil in tight reservoirs.

Purpose of the Study:

  • To classify deep formation pore types using integrated HPMI and NMR techniques.
  • To investigate crude oil phase behavior and mobilization mechanisms under varying CO2 fractions.
  • To quantitatively analyze oil mobilization during CO2 huff-n-puff in tight oil reservoirs.

Main Methods:

  • Classification of pore types using high-pressure mercury injection (HPMI) and nuclear magnetic resonance (NMR).
  • Phase behavior analysis and slim-tube experiments to study crude oil systems with different CO2 mole fractions.
  • High-pressure gas injection experiments coupled with NMR to evaluate oil recovery from various pore types under different injection conditions.
  • NMR T1/T2 analysis to differentiate adsorbed and free movable oil production.

Main Results:

  • Successful classification of deeply buried formation pore types.
  • Established a theoretical basis for analyzing crude oil mobilization mechanisms under CO2 injection.
  • Quantified the oil recovery factor contribution from different pores during CO2 huff-n-puff.
  • Distinguished between adsorbed and free movable oil production using NMR T1/T2.

Conclusions:

  • The integrated HPMI and NMR approach effectively characterizes pore types and oil mobilization.
  • CO2 huff-n-puff performance in tight oil reservoirs is quantitatively understood.
  • Provides critical guidance for applying CO2 huff-n-puff and sequestration technologies in tight oil reservoirs.