胡５—２７井是中原油田胡状构造胡５断块上的一口生产井，因１３９７套管错断，被迫停产。为恢复生产，完善注采井网，决定在１３９７套管内定向开窗侧钻。本文详述了该井施工过程中的重点工艺技术，包括１３９７套管开窗技术、小眼井轨迹控制技术、小眼井事故填井裸眼侧钻技术及小眼井落鱼打捞技术等。 Well Hu 5-27 is a production well on the Hu 5 fault block of the Huyuan tectonics of the Zhongyuan Oilfield. It was forced to stop production due to the wrong casing of 1397 casing. In order to resume production and improve the injection well pattern, it was decided to orient the fenestration in 139.7 casing. This paper details the key process technology in the well construction process, including 139.7 casing windowing technology, small-hole trajectory control technology, eye-hole accidental drilling technology and eye-hole fishing technology .