The critical gas flow is widely used to judge the loading status of vertical gas wells. Though it could demonstrate the carrying ability of gas flow, it can not quantify how much liquid it can remove and it does not take into account of the fact that the liquid-carrying ability of gas flow is limited in theory. In fact, the gas wells still load even if the gas producing rate is larger than the critical gas flow, as the gas flow rate is not capable to bring the whole liquid out of pipe. In this study, the model of maximum liquid-carrying capability was established on the basis of Pipe Flow Dynamics Theory to quantify the liquid-carrying ability of gas flow. By verifying the model with the experiments, the formula of maximum liquid-carrying capability under different degree of deviation was obtained. Afterwards, the model was tested with the on-site data of Sebei gas field. The results show the relative error of the model is generally less than 10%, which meets the requirement of the gas field development. Finally, the graph of airflow capability was obtained, which brings convenience for the operators to estimate the liquid-carrying ability and make healthy evaluation for the well.

中文翻译：

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气井中气流的最大载液能力

临界气流被广泛用于判断垂直气井的加载状态。尽管它可以证明气流的承载能力，但它无法量化它可以除去多少液体，也没有考虑到气流的载液能力在理论上是有限的。实际上，即使气体产生速率大于临界气体流量，气井仍会加载，因为气体流量无法将整个液体带出管道。在这项研究中，基于管道流动动力学理论建立了最大载液能力模型，以量化气流的载液能力。通过实验验证该模型，得到了不同偏差程度下最大载液能力的公式。之后，用涩北气田的现场数据对模型进行了测试。结果表明，该模型的相对误差一般小于10％，可以满足气田开发的要求。最后，获得了通气能力曲线图，为操作人员估计载液能力和对井进行健康评价提供了方便。