Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 2: 168 - 174

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.02.022

Drilling & Production Engineering

Analysis of formation pressure evolution patterns and influencing factors for CO2 storage

  • WANG Dian ,
  • LI Jun ,
  • LIAN Wei ,
  • LIU Xianbo ,
  • ZHANG Juncheng ,
  • GUO Shaokun
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  • 1. China University of Petroleum (Beijing), Beijing 102200, China;
    2. Karamay Campus of China University of Petroleum (Beijing), Karamay, Xinjiang 834000, China

Received date: 2024-05-24

  Revised date: 2025-01-20

  Online published: 2025-06-16

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Abstract

To investigate the evolution of reservoir pressure during CO2 storage and to prevent wellbore leakage during the well drilling and completion within the storage site, this study established a numerical model of the CO2 reservoir-caprock system based on the theory of multiphase flow through porous media to clarify the characteristics of the pressure difference evolution during the storage process and to analyze the influence patterns of key engineering geological factors.The study shows that: the injection of CO2 leads to an increase in pressure within both the reservoir and caprock.After injection ceases,the reservoir pressure gradually dissipates,with the pressure change range significantly exceeding the radius of CO2 diffusion.The caprock pressure response is delayed,causing dynamic evolution of interbed pressure differences,and there is a peak in pressure difference during the early stages of injection,which can easily lead to wellbore leakage.The peak pressure difference is negatively correlated with the distance from the injection well,reservoir temperature and pressure, reservoir pore permeability,and reservoir thickness,and positively correlated with the injection rate in a linear relationship.For large-scale CO2 geological storage,controlling the distance between CO2 injection wells and completion wells,and selecting injection points in deep-buried,thick,high-permeability,and high-porosity beds can help reduce the risk of wellbore leakage.The results of this study can provide a reference for CO2 geological storage.

Key words： CO2 storage; formation pressure; wellbore integrity; numerical simulation; multiphase flow

Cite this article

WANG Dian , LI Jun , LIAN Wei , LIU Xianbo , ZHANG Juncheng , GUO Shaokun . Analysis of formation pressure evolution patterns and influencing factors for CO2 storage[J]. Special Oil & Gas Reservoirs, 2025 , 32(2) : 168 -174 . DOI: 10.3969/j.issn.1006-6535.2025.02.022

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