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介绍了７ＴＸ－１４０型套管段铣铣刀的结构原理、刀片选材、加工工艺、性能参数及现场使用情况。表明，套管段铣铣刀开窗定向侧钻技术的应用，能使高含水、产油量少的低产井，避开水锥，提高产量；也可使枯井、工程作业报废井重新恢复生产；在同一口井内，可在不同井段多次向不同方位定向侧钻，找死油区，提高油田的采收率。是一种侧钻作业的可靠工具
Introduced the structure principle of 7TX-140 casing section milling cutter, selection of cutting blades, processing technology, performance parameters and field usage. The results show that the application of side-drilled side-hole drilling technology in casing section milling cutter can make low productivity wells with high water content and low oil production, avoid water cones and increase output, and can also resume the production of dry wells and engineering waste wells. In the same well, multiple wells can be drilled to different azimuths in different intervals to find the dead zone and improve oil recovery. Is a reliable tool for sidetracking operations