High-temperature Resistance Properties of Hydroceramic Systems at 240 ℃ and Their Influencing Factors
WANG Chuangchuang1,2, PANG Xueyu1,2,*, WANG Haige3, 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 CNPC Engineering Technology R & D Company Limited, Beijing 102206, China
Abstract: Hydroceramic systems demonstrate superior long-term high-temperature resistance compared to silica-enriched Portland cement systems, exhibiting significant potential in cementing high-pressure high-temperature (HPHT) wells. However, the factors affecting their long-term high-temperature resistance remain inadequately studied. This work was based on a hydroceramic system composed of silica and calcium hydroxide, with a density of 1.65 g/cm3. The impacts of different types of reactants (α-Al2O3, nano-activated alumina, silica fume) and calcium-to-silica molar ratio on the long-term high-temperature resistance of the hydroceramic systems were investigated. Similar to well cement systems, the strength retrogression of hydroceramic systems is corrected with the reduction in strength, coarsening of internal pores, and the transformation of C-(A)-S-H gel into crystalline minerals during long-term curing at high temperatures. During this study, various hydroceramic systems were cured at 240 ℃ for 2 days, 30 days, and 90 days, respectively, and subsequently evaluated by macro-and micro-performance tests. The results indicated that the incorporation of α-Al2O3 and nano-activated alumina promoted the formation of tobermorite 11 Å, resulting in a significant improvement in the physical-mechanical properties of the set hydroceramic system. However, the addition of these alumina types somewhat reduced the parti-cipation of silica in the hydration reaction, leading to strength retrogression issues in the system (approximately a 15% decrease in strength from 30 to 90 days). The inclusion of silica fume enhanced the participation of other reactants in the hydration reaction, thereby enhancing the formation of C-(A)-S-H and refining the pore structure. This dual effect enhanced the physical-mechanical properties and long-term stability of the hydroceramic system. When the calcium-silica-aluminum molar ratio was 2∶2∶1, the compressive strength of the hydroceramic system composed of silica, silica fume, calcium hydroxide, α-Al2O3, and nano-activated alumina was 19.1 MPa after curing for 2 days and 19.6 MPa after curing for 90 days, with no strength retrogression observed. Through the reduction of the calcium hydroxide content, a lower calcium-to-silica ratio of 0.5 (with a calcium-silica-aluminum molar ratio of 1∶2∶1) can be obtained and the early strength of the hydroceramic system could be enhanced at 2 days, reaching 22.3 MPa. However, during prolonged curing, the formation of reyerite led to a substantial decrease in strength.
王闯闯, 庞学玉, 汪海阁, 黄贤斌, 吕开河, 孙金声. 240 ℃下水合陶瓷体系的耐高温性能及其影响因素[J]. 材料导报, 2025, 39(21): 24100050-7.
WANG Chuangchuang, PANG Xueyu, WANG Haige, HUANG Xianbin, LYU Kaihe, SUN Jinsheng. High-temperature Resistance Properties of Hydroceramic Systems at 240 ℃ and Their Influencing Factors. Materials Reports, 2025, 39(21): 24100050-7.
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2025, Vol. 39 
