Considering that methane hydrate formation in the water drainage line of natural gas hydrate production well could induces a series production issue, the experiments of methane hydrate equilibrium and formation in the water-methane-silt sand system are conducted to reveal the effect of silt sand on methane hydrate equilibrium and formation by using the low-temperature and high-pressure rocking reactors. In experiments, the silt sand mass concentrations are from 0 to 4_wt% and the initial system pressures are from 4.38 to 12.14 MPa. The results from methane hydrate equilibrium experiments indicated that the silt sand could move the methane hydrate equilibrium curve to right about 1 °C, which a favorable environment for methane hydrate crystallization is created by silt sand. The correlations of methane hydrate equilibrium considering the effect of silt sand is obtained empirically. Moreover, the results from methane hydrate formation experiments showed that the silt sand could enhanced methane hydrate formation rates and promoted the water conversion ratios. The higher initial pressure conditions result in higher hydrate formation rates. The influencing mechanism of silt sand on the methane hydrate equilibrium and formation is considered to be similar with the nanofluid, which silt sand aggregate the heat and mass transfer process during methane hydrate crystallization.

针对天然气水合物生产井排水管线中甲烷水合物形成可能引发系列生产问题的问题，开展了水-甲烷-粉砂体系中甲烷水合物平衡及形成实验，揭示粉砂对生产的影响。利用低温高压摇摆反应器实现甲烷水合物的平衡和形成。实验中粉砂质量浓度为0~4 _wt %，系统初始压力为4.38~12.14 MPa。甲烷水合物平衡实验结果表明，粉砂可使甲烷水合物平衡曲线右移1℃左右，为甲烷水合物结晶创造了有利的环境。凭经验得出了考虑粉沙影响的甲烷水合物平衡关系式。此外，甲烷水合物形成实验结果表明，粉砂可以提高甲烷水合物形成速率，提高水转化率。较高的初始压力条件导致较高的水合物形成速率。粉砂对甲烷水合物平衡和形成的影响机制被认为与纳米流体相似，粉砂聚集了甲烷水合物结晶过程中的传热传质过程。