Special Oil & Gas Reservoirs >

2026 , Vol. 33 >Issue 1: 84 - 93

DOI: https://doi.org/10.3969/j.issn.1006-6535.2026.01.010

Reservoir Engineering

Numerical simulation of carbonated water flooding and CO2 sequestration rule

  • LI Shaopeng ,
  • SU Lina ,
  • HAN Rui ,
  • DANG Faqiang ,
  • MA Rui ,
  • XU Xinping ,
  • LI Songyan
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  • 1. China University of Petroleum(East China), Qingdao, Shandong 266580, China;
    2. State Key Laboratory of Deep Oil and Gas, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
    3. CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280, China;
    4. China Oilfield Services Limited, Tianjin 300456, China

Received date: 2025-02-26

  Revised date: 2025-09-17

  Online published: 2026-06-22

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Abstract

The method of dissolving CO2 in water to form carbonated(CO2-saturated)water and then injecting it into the reservoir can overcome CO2 high mobility and gravitational segregation,improving crude oil properties and increasing recovery.However,the effects of different operational parameters on carbonated water flooding and CO2 storage remain unclear.Therefore,numerical simulation was performed to study how different development schemes,CO2 molar concentrations in carbonated water,and reservoir permeabilities affects carbonated water flooding performance and CO2 sequestration.Results show that after reservoir depletion,switching to water flooding and alternating water-gas flooding yielded oil recoveries of 45.3% and 53.5% respectively.Switching to CO2 flooding increases recovery to 63.7%,but CO2 storage is only 31.9% due to gas channeling.In contrast,switching to carbonated water flooding achieved 58.2% recovery oil factor(between that of water and CO2 floodings)with CO2 storage of 44.0%.Higher CO2 concentration in carbonated water significantly improved recovery:high CO2 concentrations improved oil-water flow properties and accelerated CO2 diffusion into the oil phase,markedly enhancing oil rheology and oil recovery.Furthermore,carbonated water flooding effectively increases recovery in reservoirs of different permeabilities,while reducing CO2 channeling and enhancing CO2 sequestration.Carbonated water flooding is therefore an effective technique for improving oil recovery and achieving CO2 storage,with important implications for future oil-gas development and carbon sequestration.

Key words： carbonated water flooding; enhanced recovery; CO2 sequestration; numerical simulation

Cite this article

LI Shaopeng , SU Lina , HAN Rui , DANG Faqiang , MA Rui , XU Xinping , LI Songyan . Numerical simulation of carbonated water flooding and CO2 sequestration rule[J]. Special Oil & Gas Reservoirs, 2026 , 33(1) : 84 -93 . DOI: 10.3969/j.issn.1006-6535.2026.01.010

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