This paper introduces the principles, design of the relevant parameters, the tools needed in operation and the operation process of replacement of the No. 1 valve in the Christmas tree by running in tubing plugging devices.

• 文章介绍了利用下油管堵塞器更换井口1号闸阀的原理、相关参数设计方法,以及施工所需的工具和作业过程等。