1978年原国家地质总局正式颁发《小口径钻探管材螺纹(试行)DZ1—78》试行标准,初步统一了管材螺纹,但是对管材和接头的结构尺寸还没有完全统一,各地使用的生产图纸各有所异,部拨的管材和接头料、品种、规格也各有不同,在这种情况下,一律按DZ1-78的螺纹标准进行加工,必然产生不少问题,如接头联结同心度保证不了,钻杆丝扣部位产生裂纹以至断头等情况时有产生。我厂在贯彻DZ1—78标准中,试制了一批钻杆和接头,经过使用,发现DZ1—78标准中尚有一些问题,对此提出几点意见,供修订正式标准时参 In 1978, the State Administration of Geology formally issued the trial standard for “Drilling of Small Diameter Drill Pipes (Trial) DZ1-78”. The pipe thread was preliminarily unified. However, the structural dimensions of pipes and joints have not been completely unified. The production drawings used everywhere have their own The difference is that the pipe and joint materials, types, and specifications of the dials are all different. In this case, the DZ1-78 thread standard will be processed, which will inevitably cause many problems, such as joint concentricity can not be guaranteed. Cracks in the drill pipe thread, such as cracks, breakages, etc., may occur. In the implementation of the DZ1-78 standard, our factory trial-produced a number of drill rods and joints. After using it, we found that there are still some problems in the DZ1-78 standard. Several opinions were proposed for this purpose.