水合物生成条件的预测对于天然气的高效开发和管道安全高效输送具有重要研究意义。为了分析地层水中离子类型与矿化度对水合物形成条件的影响,使用SPT定标粒子理论修正PR-Henry模型,计算气水两相中各组分的逸度。在此基础上,运用热力学理论,提出了一种根据不同温度条件下的水合物生成压力判识水合物生成类型、预测水合物生成条件的计算方法。研究表明:对于烃-CO2-水混合体系,相比传统模型,该模型计算的水合物平衡条件值与实测资料的相对误差由0.255降低至0.073,具有较好的计算精度;在盐质量分数较低时,NaCl和CaCl2对水合物生成的抑制作用相近。但随着盐质量分数的增加,CaCl2对水合物生成的抑制作用明显大于NaCl。研究成果对天然气水合物的开发以及天然气管道输送具有借鉴意义。
Predicting hydrate formation conditions is of great significance for the efficient development of natural gas and safe, efficient pipeline transport.To analyze the effects of ion type and salinity in formation water on hydrate formation conditions,scaled particle theory (SPT)-adjusted PR-Henry model was used to calculate the fugacity of each component in the gas-water phases.Based on this and thermodynamic theory,a calculation method was proposed to identify hydrate formation type and predict hydrate formation conditions under different temperature conditions.The study showed that for a hydrocarbon-CO2-water mixed system,compared with traditional models,the improved model reduces the relative error between calculated hydrate equilibrium conditions and experimental data from 0.255 to 0.073,achieving good accuracy.At low salt concentrations,NaCl and CaCl2 had similar inhibiting effects on hydrate formation,but as salinity increased,CaCl2 inhibition was significantly greater than that of NaCl.These findings offer useful reference for gas hydrate development and safe natural gas pipeline transportation.
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