低气液比携液临界流量的确定方法

Determination of the critical liquid carrying flow rate at low gas liquid ratio

针对低气液比的气井携液情况,以Hagedorn和Brown井筒压力计算方法为基础,定义了理论和实际持液率,建立确定低气液比携液临界流量的原则和计算公式。对携液临界流量影响因素的讨论及井底压力的分析表明:为了保持正常携液,不仅需要一定的产气量,而且必须具备相当高的气层压力。现场实例分析表明,该方法计算结果与气井实际生产情况相吻合。

Based on Hagedorn and Brown's method of wellbore pressure calculation, theoretical and actual liquid holdups at low gas liquid ratio are defined, and the principle and formulas to calculate the critical liquid carrying flow rate are established. The analysis of the influencing factors of the critical liquid carrying flow rate and the bottomhole pressure reveals that high gas reservoir pressure, as well as high gas production rate, is required for normal liquid carrying. The field application indicates that the computation results of the method accord with actual production data.