水平井是近年来普遍应用的一种先进钻井技术，其具有水平段泄油面积大，最大限度地裸露油气层，增加出油气厚度，提高油气井产量和采收率的作用。台H5-1井是柴达木盆地台南气田的第一口水平井，也是一口长井段水平井，设计水平段长1 000 m。根据台南气田第四系（Q₁₊₂）特性，分析了该气田存在的施工难点，提出台H5-1水平井钻井完井工艺的技术对策是：优化井身结构、钻具组合、钻井液、完井工艺、控制井眼轨迹的地质导向技术等。

Tai H5-1 is the first horizontal well drilled in the Tainan gas field, Qaidam Basin, with a long lateral segment of 1 000 m. Based on the features of Quaternary Formation Q₁₊₂,and the history data of vertical wells, the drilling difficulties of the horizontal well were analyzed and the technical countermeasures were put forward: optimizing borehole geometry, drilling assembly, trajectory controlling by LWD, drilling technique including the selection of drilling fluid, completion technique including the selection of completion fluid, and safety requirements, etc. Through the first and successful application of the above techniques to Tai H5-1, valuable experience is obtained and can be used for exploiting Tainan gas reservoirs.