随着深层页岩气开发过程中大规压裂导致产量快速递减，准确掌握气液流动规律是气井稳产的必要手段，通过建立两种井身轨迹结构的气井模型，应用OLGA软件对不同油管下深模型进行瞬态计算。结果表明：深层页岩气井A₁仅在造斜段及以上出现段塞流，而B₁井在水平段及造斜段附近出现段塞流的情况。考虑到累计产气量与积液，深层页岩气井A₁、B₁油管下入水平段跟端时最佳，与深层两种井身轨迹结构对应的常规页岩气井油管最优下深分别为水平段跟端和1/3水平段处；深层页岩气井较常规页岩气井更有利于排采和生产。随着油管尺寸的减小，产气量越小，对应气体的临界携液流量也越小；页岩气组分中轻烃的含量越大，气体产量随之增大。该研究可为深层页岩气井排水采气工艺中油管下入合理位置提供参考。

As large-scale fracturing in the development of deep shale gas results in rapid production decline, the accurate understanding of gas-liquid flow patterns is considered essential for stabilizing gas well production. Gas well models with two different wellbore trajectory structures were established, and OLGA software was applied to conduct transient calculations on models with varying tubing depths. The results indicate that in deep shale gas well A₁, slug flow only occurs in the build-up section and above, while in well B₁, slug flow appears in the horizontal section and near the build-up section. Considering cumulative gas production and liquid loading, the optimal tubing depth for deep shale gas wells A₁ and B₁ is at the heel of the horizontal section, while for conventional shale gas wells A and B, the optimal tubing depths are at the heel of the horizontal section and one-third of the horizontal section. Deep shale gas wells are more favorable for drainage and production compared to conventional shale gas wells. The optimal tubing setting depths for conventional shale gas wells with two deep formation wellbore configurations are at the horizontal section heel and the one - third point of the lateral, respectively. It is determined that deep shale gas wells are more advantageous for drainage and production compared to conventional shale gas wells. As the tubing size decreases, both the gas production and the corresponding critical gas flow rate for liquid carryover are reduced. It is also found that the greater the light hydrocarbon content in the shale gas composition, the higher the gas production. This study is intended to provide a reference for determining the rational tubing placement in the drainage and gas production processes of deep shale gas wells.