CO<sub>2</sub> Sequestration Wellbore Sealing and Enhancement Method

WANG Dian; LI Jun; LIAN Wei; LIU Xianbo; ZHANG Juncheng; GUO Shaokun

doi:10.6054/j.jscnun.2024001

Journal of South China Normal University (Natural Science Edition) > 2024 > 56(1): 1-8. > DOI: 10.6054/j.jscnun.2024001

WANG Dian, LI Jun, LIAN Wei, LIU Xianbo, ZHANG Juncheng, GUO Shaokun. CO₂ Sequestration Wellbore Sealing and Enhancement Method[J]. Journal of South China Normal University (Natural Science Edition), 2024, 56(1): 1-8. DOI: 10.6054/j.jscnun.2024001

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CO₂ Sequestration Wellbore Sealing and Enhancement Method

1.
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
2.
College of Petroleum, China University of Petroleum-Beijing at Karamay, Karamay 834000, China

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Received Date: January 07, 2024
Available Online: April 29, 2024

Graphical Abstract

Abstract

Abstract

Considering the service environment of the CO₂ sequestration wellbore, a wellbore model containing a cement corrosion layer was developed. Based on the finite element method, the development process of micro-annulus at the cement plug-formation interface was simulated, the mechanism of micro-annulus expansion and the main controlling factors under the fluid drive were clarified, and the method of wellbore sealing enhancement was proposed. The simulation results show that the supercritical CO₂ accumulation will cause a change in the stress at the cement bonding surface. When the stress at the interface changes from compressive to tensile, and the stress value is higher than the bonding strength, micro-annulus will be generated in the wellbore. If the cement stiffness and bonding strength decrease after corrosion, the wellbore sealing decreases; the expansive additive can increase the initial compressive stress of the bonding surface and then enhance the wellbore sealing. When the expansion rate is 0.5‰, the micro-annulus propagation pressure rises by 43.7%, the micro-annulus length decreases by 42.7%, and the wellbore sealing is significantly enhanced.
- CO₂ sequestration wellbore,
- sealing,
- micro-annulus,
- cement plug,
- enhancement method

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References (34)

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