Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 5: 137 - 145

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.05.016

Reservoir Engineering

High-temperature high-pressure micro-visualization experiment of CO2 flooding in low-permeability reservoirs

  • HU Yisheng ,
  • CHEN Jihong ,
  • CHENG Qiurong ,
  • PU Lei ,
  • GUO Ping
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500, China;
    2. CNOOC Changzhou Paint and Coatings Industry Research Institute Co.,Ltd.,Changzhou,Jiangsu 213000, China;
    3. PetroChina Changqing Oilfield Company,Yan′an,Shaanxi 716009, China

Received date: 2024-07-11

  Revised date: 2025-07-14

  Online published: 2025-10-30

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Abstract

To address the insufficient understanding of the microscopic mechanism of enhanced oil recovery (EOR) by CO2 flooding in high-temperature high-pressure and low-permeability reservoirs,a high-temperature high-pressure micro-visualization experiment was conducted.Using ImageJ threshold analysis,the microscopic oil displacement mechanisms of CO2 miscible and immiscible flooding were studied,the residual oil of CO2 miscible and immiscible flooding was classified and characterized,and the effects of CO2 injection volume,injection rate,injection pressure,and reservoir heterogeneity on the final recovery degree were investigated.The study shows that the leap displacement and gas-oil-gas composite displacement occur,and CO2 compression-release easily occur in narrow throats during CO2 flooding.In both CO2 miscible and immiscible flooding processes,as the CO2 injection volume increases,the displacement efficiency rises significantly and then stabilizes.With increasing displacement velocity,displacement efficiency first increases and then decreases.When the displacement pressure exceeds the minimum miscibility pressure (MMP),the recovery of residual oil in low-permeability reservoirs can be enhanced.Compared with immiscible flooding,CO2 miscible flooding yields better results and the final recovery degree is less affected by reservoir heterogeneity.This research provides an important theoretical basis and practical guidance for the design of CO2 flooding development plans in low-permeability reservoirs.

Key words： low-permeability reservoir; high-temperature high-pressure; micro-mechanism visualization experiment; CO2 miscible flooding; enhanced oil recovery (EOR); CO2 immiscible flooding; residual oil

Cite this article

HU Yisheng , CHEN Jihong , CHENG Qiurong , PU Lei , GUO Ping . High-temperature high-pressure micro-visualization experiment of CO2 flooding in low-permeability reservoirs[J]. Special Oil & Gas Reservoirs, 2025 , 32(5) : 137 -145 . DOI: 10.3969/j.issn.1006-6535.2025.05.016

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