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Degradation of chemical and mechanical properties of cements with different formulations in CO_(2)-containing HTHP downhole environment

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Petroleum Science 2023年第2期20卷 1119-1128页

作者： Wei Yan Hao-Guang Wei nguu dickson muchiri Fu-Li Li Jing-Ru Zhang Zheng-Xian Xu State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Sinopec Petroleum Engineering Technology Research Institute Co. Ltd.Beijing102206China

The increasing energy demand has pushed oil and gas exploration and development limits to extremely challenging and harsher HTHP (High Temperature and High Pressure) environments. Maintaining wellbore integrity in these environments, particularly in HPHT reservoirs with corrosive gases, presents a significant challenge. Robust risk evaluation and mitigation strategies are required to address these reservoirs' safety, economic, and environmental uncertainties. This study investigates chemo-mechanical properties degradations of class G oil well cement blended with silica fume, liquid silica, and latex when exposed to high temperature (150 °C) and high partial pressure of CO_(2) saturated brine. The result shows that these admixtures surround the cement grains and fill the interstitial spaces between the cement particles to form a dense crystal system of C–S–H. Consequently, the cement's percentage of pore voids, permeability, and the content of alkali compounds reduce, resulting in increased resistance to CO_(2) corrosion. Liquid silica, a specially prepared silica suspension, is a more effective alternative to silica fume in protecting oil well cement against CO_(2) chemical degradation. Micro-indentation analysis shows a significant deterioration in the mechanical properties of the cement, including average elastic modulus and hardness, particularly in the outer zones in direct contact with corrosive fluids. This study highlights the significance of incorporating admixtures to mitigate the effects of CO_(2) corrosion in HPHT environments and provides a valuable technique for quantitatively evaluating the mechanical-chemical degradation of cement sheath.

关键词： HPHT reservoirs Oil well cement CO_(2)corrosion Chemo-mechanical Mechanical properties Micro-indentation

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