A method of servicing a wellbore comprising placing a composition
comprising cement, water, and a heat sink material into a wellbore, and
allowing the composition to set, wherein at least a portion of the heat
sink material undergoes a phase transition by absorbing at least a
portion of the heat released upon hydration of the cement. A method of
completing a wellbore, comprising forming a wellbore in a subterranean
formation comprising permafrost, gas hydrates, or both, preparing a
cement composition comprising cement, water, and a heat sink material,
placing the cement composition into an annulus formed between a casing
and the wellbore, and allowing the composition to set, wherein at least a
portion of the heat sink material undergoes a phase transition by
absorbing at least a portion of the heat released upon hydration of the
cement, thereby reducing an amount of heat transferred from the annular
cement to the surrounding permafrost and/or gas hydrates.