Novel cement slurry containing micro‐encapsulated phase change materials: Characterization, application and mechanism analysis.

Summary: Cementing is the key factor in releasing ocean oil and gas resources, but more than 70% of marine cementing faces the challenge of hydrates decomposition. Thus, during this study, the micro‐encapsulated phase change material Micro‐P1 was prepared by paraffin wax, urea formaldehyde resin and graphene oxide through in situ polymerization. Firstly, the application performances of Micro‐P1 were studied, and the results show that the performances were significantly improved by graphene oxide. Secondly, a novel cement slurry containing Micro‐P1 was prepared, and the heat evolution was successfully controlled by Micro‐P1. Thirdly, the thermal control mechanism of Micro‐P1 on heat evolution of cement slurry was also investigated, which indicated the heat evolution was controlled through endothermic effect firstly. Simultaneously, the hydration reaction of cement slurry was delayed by Micro‐P1, in this way, the heat evolution was further controlled. The highlights of this study is that the heat evolution was successfully controlled by using Micro‐P1, and provides technical support for exploration and development of ocean oil and gas resources, especially hydrates formation. Furthermore, the thermal control mechanism of Micro‐P1 on the heat evolution was firstly investigated in this study. [ABSTRACT FROM AUTHOR]