Effect of Early-Age Hydrothermal Curing on Structural Stability of Calcium Aluminate Cement

Abstract

Abstract: Calcium aluminate special cement with rapid early-age strength development and high-temperature resistance is frequently utilized for well cementing operations in heavy oil thermal recovery. It is essential for understanding the effect of early-age hydrothermal curing on the structural stability of cement binder to maintain cementing safety and oil recovery effectiveness. The strength development, mineral composition, and microstructure of cement cured at 20, 50 and 80 ℃ were investigated. The results show that the main mineral phases formed in calcium aluminate cement, such as gehlenite, CAH₁₀ and C₂AH₈, gradually transform into granular hydrogarnet with poor cementation during hydrothermal curing, resulting in loose and porous structure of cement binder, which leads to the decline in compressive strength. The incorporation fly ash and slag can not effectively prevent the crystal transformation and structural damage. The modification of sodium hexametaphosphate maintains the structural stability of mineral phases, and the dissolved Na⁺ and HPO^-₄ ions released from hexametaphosphate react with Ca²⁺ and [AlO₄]^5- ions released from cement to generate sodium calcium aluminophosphate hydrate (N-C-A-P-H) gel phase products, which further enhances the density and cementation performance of cement binder.

Key words: calcium aluminate cement, well cementing, heavy oil thermal recovery, mineral transformation, microstructure, stability

CLC Number:

TQ172

ZHOU Jianfeng, YANG Tao, ZHANG Jingyan, ZHOU Wenping, GAO Xuan. Effect of Early-Age Hydrothermal Curing on Structural Stability of Calcium Aluminate Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 802-807.

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