Oil production characteristics and CO2 storage mechanisms of CO2 flooding in ultra-low permeability sandstone oil reservoirs

Using the ultra-low permeability reservoirs in the L block of the Jiangsu oilfield as an example, a series of experiments, including slim tube displacement experiments of CO 2 -oil system, injection capacity experiments, and high-temperature, high-pressure online nuclear magnetic resonance (NMR) displacement experiments, are conducted to reveal the oil/gas mass transfer pattern and oil production mechanisms during CO 2 flooding in ultra-low permeability reservoirs. The impacts of CO 2 storage pore range and miscibility on oil production and CO 2 storage characteristics during CO 2 flooding are clarified. The CO 2 flooding process is divided into three stages: oil displacement stage by CO 2 , CO 2 breakthrough…

• NN
  National Natural Science Foundation of China

  Award: 52274053
• NS
  Natural Science Foundation of Beijing Municipality

  Award: 3232028