The Performance and Mechanisms of High-temperature Retrogression Resistance in Fly Ash and Slag-Modified Well Cementing Systems
PANG Xueyu1,2, CHENG Guodong2, HUANG Xianbin1,2, BAI Yingrui1,2, GAO Zhi2, HAO Borong2, LYU Kaihe1,2, SUN Jinsheng1,2,*
1 State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, Shandong, China 2 School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
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.
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2026, Vol. 40 
