目前金刚石钻进常用平行的螺纹连接钻杆,这种连接方式已延用很长时间,没有发生根本性的改变,使用过程中常常出现公、母螺纹的折断和母螺纹的变形向外鼓起。这种平行螺纹连接的钻杆存在三方面较严重的问题,一是由于它本身的结构所致,连接处摇摆晃动,在螺纹表面上互相间不断 Currently diamond drilling commonly used parallel threaded drill pipe, this connection has been extended for a long time, there is no fundamental change in the use of the process often appear male and female thread breakage and deformation of female thread bulging outward . This parallel thread drill pipe there are three more serious problems, first because of its own structure, the joints swinging, moving on the surface of the thread between each other