长期使用岩心管表明,钻粒钻进时岩心管的外径迅速磨损。岩心管的底部磨损最大。在岩心管与钻头连结处的管壁厚度是不牢靠的,因此不得不经常更换岩心管。近几年来,许多地质队在钻粒钻进时采用壁厚由6．5到7．5毫米的接头管料制造的岩心管。 Long-term use of core tube shows that the outer diameter of core tube rapidly wear when drilling. Core tube bottom wear the most. The thickness of the pipe wall where the core pipe is connected to the drill bit is not reliable, so the core pipe has to be replaced frequently. In recent years, many geologic teams have used core tubes made of 6.5-7.5 mm wall thickness pipe when drilling.