高温高压下固井水泥石力学行为及其关键影响因素

doi:10.11896/cldb.24060212

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Abstract Well cements, which serve in deep and ultra-deep formations as well as unconventional shale formations, are subjected to harsh (high temperature and high pressure) downhole environments. An in-depth study of the mechanical behaviors of well cements under different influencing factors is essential for the optimal design of cementing systems and for ensuring the seal integrity of the wellbore. This work mainly investigated the influence of temperature conditions, testing pressure, and water content on the mechanical behavior of set cement. The experimental results show that the mechanical behavior of set cement, under varying temperature conditions, exhibits complex characteristics, which are influenced prominently by factors such as its drying state, duration of high-temperature exposure, and confining pressure. Under uniaxial loading, the influence of testing temperature on the mechanical behavior of set cement is relatively small. However, under triaxial loading, both the yield strength and ultimate strength of set cement decrease significantly with increasing of testing temperature. At low confining pressures, both dry and saturated set cements exhibit brittle failure characteristics at different temperatures, but the yield strength and ultimate strength of the former are much higher than those of the latter. Conversely, under high confining pressures, dry set cement displays notable strain hardening and ductile failure characteristics, whereas saturated set cement still exhibits brittle failure.

Key words： well cement water content high temperature and high pressure deformation behavior

Published: 25 June 2025 Online: 2025-06-19

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TE256

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	Articles by authors
	PANG Xueyu
	LI Hailong
	HUANG Xianbin
	LIU Jinping
	LYU Kaihe
	SUN Jinsheng

Cite this article:

PANG Xueyu,LI Hailong,HUANG Xianbin, et al. Mechanical Behaviors of Well Cement Under High Temperature and High Pressure Conditions and the Crucial Influencing Factors[J]. Materials Reports, 2025, 39(12): 24060212-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24060212 OR https://www.mater-rep.com/EN/Y2025/V39/I12/24060212

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