管下扩眼是一项不常用的技术 ,但随着石油工业的发展 ,钻井难度越来越大 ,特别在深井和超深井中 ,常会遇到狗腿、键槽和缩径等复杂情况 ,而且在深井钻井中要求下多层管柱 ,这就增加了对更耐用更可靠的管下扩眼器的需求 ,而以往常用的可胀开牙轮扩眼器存在着某些内在问题 ,如牙轮寿命短、水力参数有限及部件薄弱 ,导致使用效果不理想。文中通过介绍塔参一井的扩眼施工 ,将一种新型的扩眼器与常规扩眼器作比较 ,介绍其工作原理和使用方法 ,对新型扩眼器存在的问题作分析 ,总结在现场使用过程中的注意事项 Under-pipe reaming is an uncommon technique, but with the development of the oil industry, it is more and more difficult to drill. Especially in deep and ultra-deep wells, it often encounters complex situations such as dogleg, keyway and diameter reduction, etc. The requirement for multi-layer columns in deep-well drilling increases the need for more durable and reliable downhole reamers that previously had some inherent problems such as teeth Short wheel life, limited hydraulic parameters and weak parts lead to unsatisfactory results. In this paper, by introducing the reaming construction of a well in Tazhong, a new type of reamer is compared with the conventional reamer to introduce its working principle and application method, analyze the problems existing in the new reamer, Precautions during use