Mechanical Behaviors of Well Cement Under High Temperature and High Pressure Conditions and the Crucial Influencing Factors
PANG Xueyu1,2, LI Hailong2,3, HUANG Xianbin1,2, LIU Jinping1,2, 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 3 CNPC Engineering Technology R&D Company Limited, Beijing 102206, China
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.
庞学玉, 李海龙, 黄贤斌, 刘敬平, 吕开河, 孙金声. 高温高压下固井水泥石力学行为及其关键影响因素[J]. 材料导报, 2025, 39(12): 24060212-7.
PANG Xueyu, LI Hailong, HUANG Xianbin, LIU Jinping, LYU Kaihe, SUN Jinsheng. Mechanical Behaviors of Well Cement Under High Temperature and High Pressure Conditions and the Crucial Influencing Factors. Materials Reports, 2025, 39(12): 24060212-7.
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2025, Vol. 39 
