粉煤灰与矿渣改性油井水泥体系抗高温衰退性能及机理

doi:10.11896/cldb.25010110

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Abstract Traditional silica-enriched oil well cement systems often experience severe strength retrogression during long-term service under ultra-high temperature conditions in ultra-deep wells. There is thus an urgent need to develop novel high-temperature-resistant cement systems with enhanced strength-retrogression resistance to ensure long-term zonal isolation in wellbore annuli. This work presents a comprehensive comparative analysis of high-temperature performance among three cement systems: traditional silica-enriched cement, fly ash-modified cement, and slag-modified cement. The results demonstrate that during extended curing periods (≥30 days), the fly ash-modified system exhibits superior performance in terms of macroscopic physico-mechanical properties as well as microstructural and compositional stability, compared to both conventional silica-enriched and slag-modified systems. Furthermore, when the CaO/SiO₂ molar ratio is adjusted to approximately 0.83 by optimizing the contents of silica sand and fly ash, variations in fly ash dosage show negligible effects on the strength-retrogression resistance of the cement matrix.

Key words： fly ash granulated blast furnace slag silica-enriched oil well cement high temperature and high pressure long-term strength retrogression

Published: Online: 2026-04-16

CLC number:

N34

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	Articles by authors
	PANG Xueyu
	CHENG Guodong
	HUANG Xianbin
	BAI Yingrui
	GAO Zhi
	HAO Borong
	LYU Kaihe
	SUN Jinsheng

Cite this article:

PANG Xueyu,CHENG Guodong,HUANG Xianbin, et al. The Performance and Mechanisms of High-temperature Retrogression Resistance in Fly Ash and Slag-Modified Well Cementing Systems[J]. Materials Reports, 2026, 40(7): 25010110-7.

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https://www.mater-rep.com/EN/10.11896/cldb.25010110 OR https://www.mater-rep.com/EN/Y2026/V40/I7/25010110

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