关键词: 水合物, 水合物浆体, 形成条件, 生成量, 影响因素

Abstract: Hydrate is easily generated in natural gas deep⁃water pipelines. It is of great significance to study the formation of influencing factors on the safe operation of pipelines. PVTsim was used to establish a numerical model, and based on five experimental data, the reliability of the model was analyzed. Using this model, the boundary conditions of natural gas hydrate formation under different gas composition and salinity conditions were simulated. At the same time, based on experimental data and OLGA simulation data, the quantitative relationship between hydrate volume fraction and molecular concentration of medium was obtained. The rusults show that hydrate formation is more affected by temperature than pressure. For natural gas, the addition of ethane, propane, carbon dioxide, and hydrogen sulfide all increases the range of hydrate formation, and the addition of nitrogen will reduce the range of hydrate formation. As the salinity in the water increases, the range of hydrate formation decreases. External temperature and pressure have little influence on the amount of hydrate formation and are almost negligible. Based on the research results of the hydrate slurry transportation technology, the critical methane mole fraction that ensures the safety of the HCFC⁃141b and THF hydrate slurry flow was obtained.

Key words: Hydrate, Hydrate slurry, Forming conditions, Generated amount, Influencing factors