Effect of the Ca/Si Ratio and Different Aluminum-containing Materials on the High-temperature Resistance of the Hydroceramic System
PANG Xueyu1,2, WANG Chuangchuang1,2, SUN Lijun3, HUANG Xianbin1,2, 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 Petroleum Engineering Technology Institute of Sinopec Shengli Oilfield, Dongying 257000, Shandong, China
Abstract: The CaO-SiO2-Al2O3 hydroceramic system has broad application prospects in well cementing for deep and ultra-deep wells. However, the Ca/Si ratio and the use of different aluminum-containing materials significantly influence the high-temperature resistance of the hydroceramic system. This study investigated the effects of α-Al2O3, nano-activated alumina, and two different compositions of calcium aluminate powder on the mechanical properties, pore structure, and mineral composition of hydroceramic systems with different Ca/Si ratios (The density was 1.65 g/cm3) after high-temperature curing (cured under 240 ℃/50 MPa for 2, 30, and 90 days). The results indicated that when the Ca/Si ratio was 0.5, the addition of α-Al2O3 decreased the system's high-temperature stability. The simultaneous addition of α-Al2O3 and nano-activated alumina significantly decreased the system's early porosity (at 2 days), but it also led to a rapid increase in porosity and a decline in long-term strength in later stages. Replacing alumina with calcium aluminate significantly decreased the system's mechanical properties. When the Ca/Si ratio was 1, the addition of α-Al2O3 somewhat enhanced the early mechanical properties of the system. The simultaneous addition of α-Al2O3 and nano-activated alumina further enhanced the system's mechanical properties. However, the long-term strength of these two systems significantly decreased at 90 days. Replacing alumina with calcium aluminate noticeably decreased the pore size of the system and further enhanced mechanical properties (the maximum compressive strength reaching up to 22.9 MPa) and long-term stability. The composition of calcium aluminate had a certain impact on the performance of the hydroceramic system, with calcium aluminate powder containing more CaO·Al2O3 and 2CaO·Al2O3·SiO2 showing better optimization effects on the high-temperature resistance of the hydroceramic system.
庞学玉, 王闯闯, 孙立君, 黄贤斌, 吕开河, 孙金声. 钙硅比以及不同含铝材料对水合陶瓷体系抗高温性能的影响[J]. 材料导报, 2025, 39(19): 25020044-8.
PANG Xueyu, WANG Chuangchuang, SUN Lijun, HUANG Xianbin, LYU Kaihe, SUN Jinsheng. Effect of the Ca/Si Ratio and Different Aluminum-containing Materials on the High-temperature Resistance of the Hydroceramic System. Materials Reports, 2025, 39(19): 25020044-8.
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2025, Vol. 39 
