Preparation of cellulose aerogel-based phase change temperature control material and its application in low temperature cementing

Based on the challenges in offshore oil and gas cementing operations, such as slow cement hydration, restricted strength development, and increased gas hydrate layer decomposition risks, cellulose aerogel-based phase-change thermal control material NCPCM using one-step in-situ encapsulation combined with freeze-drying was prepared in this study. This material can effectively regulate the hydration heat of cement slurry under low temperature conditions. Hexagonal boron nitride was introduced to enhance the heat transfer capacity of the material, significantly improving its thermal conductivity. The modified NCPCM was analyzed, and the effect of NCPCM on the hydration mechanism of cement was investigated. The results showed that the phase transition temperature (T m ) of NCPCM was 20.83 °C, accompanied by a latent heat of 143.14 J/g. In the low temperature environment of 4 °C, the incorporation of NCPCM into cement slurry can effectively reduce the temperature rise and cumulative heat release of cement hydration. At the same time, the incorporation of NCPCM can promote the formation of ettringite (AFt), calcium-silicate-hydrate (C-S-H) and calcium hydroxide (CH), and improve the early compressive strength of cement. NCPCM is environmentally friendly and has a good application prospect in deep-sea shallow gas hydrate layer cementing.