Based on the requirements of low hydration heat and temperature rise of cement slurry used in deep-water gas hydrate formation, the thermal control effects of slag and fly ash on heat development of cement slurry were quantitatively and qualitatively investigated. The results show that the temperature rise, hydration heat and heat release rate of cement slurry were successfully reduced by slag and fly ash, which is beneficial to the cementing of gas hydrate formation, the engineering accidents, such as enlarged diameter, were avoided. Compared with pure cement slurry, the temperature rise of sample PCF_37.5% and PCS_37.5% was reduced by 16.5 and 12.1 °C, respectively. The hydration heat of sample PCF_37.5% and PCS_37.5% at 48 h was reduced by 35.3 and 16.3%, respectively. Secondly, the thermal control mechanisms of slag and fly ash on heat development of cement slurry were studied by X-ray Diffraction, Scanning Electron Microscope and Low Field Nuclear Magnetic Resonance Testing. As a result, the quantitative analysis shows that the heat development of cement slurry was controlled firstly by the lower hydration heat characteristics of slag and fly ash. The hydration heat of slag and fly ash at 48 h is 28.153–47.067 J/g and 2.0549–4.765 J/g, respectively. Besides, the qualitative analysis of hydration process and products shows that the heat development was also controlled by delay effect of slag and fly ash. Compared with pure cement slurry, the hydration products of sample PCF_50.0% and PCS_50.0% were obviously reduced. The innovation of this study is that the fly ash and slag were used to control the heat development of cement slurry used in hydrate formation. Especially, the control mechanisms were obtained quantitative calculation and qualitative analysis. Furthermore, the research results could provide technical reference for the design of cement slurry for hydrate formation cementing.

根据低水化热量和深水气水合物形成过程中水泥浆温升的要求，定量研究了渣和粉煤灰对水泥浆热发展的热控制效果。结果表明，矿渣和粉煤灰可有效降低水泥浆的升温，水化热和放热率，有利于胶凝气水合物的形成，避免了扩径等工程事故。与纯水泥浆相比，样品PCF _37.5％和PCS _37.5％的温升分别降低了16.5和12.1°C。样品PCF _37.5％和PCS _37.5％的水合热在48 h时分别降低了35.3％和16.3％。其次，通过X射线衍射，扫描电镜和低场核磁共振试验研究了矿渣和粉煤灰对水泥浆热发展的热控制机理。结果，定量分析表明，水泥渣的热发展首先受到矿渣和粉煤灰较低的水合热特性的控制。矿渣和粉煤灰在48 h的水合热分别为28.153-47.067 J / g和2.0549-4.765 J / g。此外，对水合过程和产品的定性分析表明，热量的产生还受到炉渣和粉煤灰的延迟效应的控制。与纯水泥浆相比，样品PCF _50.0％和PCS _50.0％的水合产物明显减少。这项研究的创新之处在于，粉煤灰和矿渣用于控制水合物形成过程中水泥浆的热量发展。特别是对控制机理进行了定量计算和定性分析。研究结果可为水合物固井水泥浆的设计提供技术参考。