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HomeMaterials Science ForumMaterials Science Forum Vol. 993Effects of Compressive Stress on...

Effects of Compressive Stress on Carbonation-Induced Degradation of Oil Well Cement under CO₂ Storage Environment

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Abstract:

This paper presents an experimental study to investigate the effects of compressive stress during the CO₂ attack on wellbore cement under carbon capture and storage (CCS) conditions. Oil well cement samples were designed to be exposed to humid supercritical CO₂ gas and CO₂-saturated brine and simultaneously subjected to external compressive stresses with load levels of 0, 25%, 50%, and 75% of the ultimate compressive strength. Morphology changes were determined using phenolphthalein dye testing and scanning electron microscopy. Mineral changes were detected by X-ray diffraction. Relative compressive strength and gas permeability of exposed cement were analyzed. It is shown that the 25% stress level has little effect on degradation of cement while the applied compression load up to 50% increased the compactness of cement and finally slowed down the degradation rate. In contrast, a much higher compressive stress level up to 75% facilitated the generation and propagation of micro-cracks. The stress induced micro-crack finally caused a surge in CO₂-rich fluids and then significantly accelerated the degradation rate of oil well cement. Findings from this study expanded the understanding of the integrity of oil well cement for CCS wells.

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Periodical:

Materials Science Forum (Volume 993)

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1303-1318

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.993.1303

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Online since:

May 2020

Authors:

Tao Gu*, You Cheng Zheng, You Zhi Zheng, Hong Wei Xia, Xiao Wei Cheng, Xiao Yang Guo

Keywords:

Carbonation, CO₂ Storage, Compressive Stress, Integrity, Oil Well Cement

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© 2020 Trans Tech Publications Ltd. All Rights Reserved

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