Abstract
Based on the low hydration heat requirement of cement slurry system used in natural gas hydrate layer and the shortcoming of traditional methods, a novel material, namely, micro-encapsulated phase change material (MPCM-1) was synthesized and used to regulate the temperature profiles and hydration heat of the cement slurry system by a physical method. During this study, the hydration heat was absorbed by MPCM-1 when the temperature of cement slurry system beyond the melting point of the phase change material (PCM), and then the hydration heat was released by the MPCM-1 when the temperature of cement slurry system drops below the crystallization point of PCM. The MPCM-1 containing low melting paraffin wax with urea formaldehyde resin shell was prepared by the method of in situ polymerization. At first, the structure of MPCM-1 was obtained by infrared spectrum analysis (FT-IR). Secondly, the phase change properties of MPCM-1 were measured by using a differential scanning calorimeter (DSC). As a result, it was shown that the melting point and heat of fusion of MPCM-1 is 23.09 °C and −97.49 J/g, respectively. Moreover, the thermal stability of MPCM-1 was obtained by using a synchronous thermal analyzer. Simultaneously, the surface morphology, particle size and distribution of MPCM-1 were also measured by using a scanning electronic microscope (SEM) and Laser particle size analyzer. Then, the MPCM-1 was introduced into the ordinary Portland cement slurry system to prepare a low hydration heat cement slurry system, the heat evaluation of cement slurry system were investigated by using a developed semi-adiabatic test equipment. The controlling effects of MPCM-1 on the heat evaluation of cement slurry system were investigated by the temperature profiles and hydration heat. Particularly, the temperature profiles were characterized by the initial temperature (Tin), temperature rise (Tr), maximum temperature (Tmax), and the hydration time (tmax) corresponding to the maximum temperature (Tmax), respectively. Besides, the effects of MPCM-1 on the mechanical strength of cement slurry system were also studied. As a result, it was shown that the use of the synthesized MPCM-1 reduced the Tr and Tmax of cement slurry system, it was also confirmed that the cement slurry system prepared by the synthesized MPCM-1 presented excellent mechanical properties.
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