气井井筒中形成的天然气水合物，会堵塞油管，影响生产。通过对国内外文献的调研，分析了气井水合物的形成条件、影响因素及各种预测方法。在研究气井井筒的温度、压力分布的基础上，结合水合物形成的简化牛顿热力学改进预测方法，建立了水合物形成的预测模型，并编制软件进行气井实例计算。计算结果表明，该模型预测水合物形成效果较好。

Gas hydrate formation in well hole will block up oil pipes so as to affect normal production. By reference of documents, we conclude the formation conditions of gas hydrate in gas well hole, controlling factors as well as prediction methods. Based on temperature and pressure in gas wells and simplified Newton thermodynamics prediction methods of gas hydrate formation, we set up a prediction model of gas hydrate formation, and compiled the software to calculate gas hydrate formation in two cases. The calculated results suggested that the model would be a preferable prediction of gas hydrate formation.