φ420 mm插接式密封型螺旋钻杆的研制

Research and Development of φ420mm Helix Drilling Rod of Sealed Bullet Connection

摘要:

φ420 mm插接式密封型螺旋钻杆是为满足煤层中利用螺旋钻具钻进近水平大直径钻孔的需要而研制的。介绍了其设计、加工和应用等情况。

Abstract:

The article introduced research and development of φ420mm helix drilling rod of sealed bullet connection, including the design, manufacture and the part of application.