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小口径钻孔中的异物,如开孔或合金分层钻进时残留的合金碎块及钢粒,处理事故时残留的铁片及胎块等,都必须捞取干净,以保持孔内清洁,使金刚石钻头在良好的环境中工作.处理孔底异物,通常采用冲、磨、捞、粘等方法,既费时效果也不理想.换径时,往往一个班捞不净残留合金片,轻则使钻头唇部拉槽,重则打烂钻头.从1978年起,我队采用岩心管干钻法,一次(最多两次)可捞尽孔底异物,一小时内恢复正常生产.方法如下:
Small diameter borehole foreign body, such as open hole or alloy layered drilling residual alloy fragments and steel particles, the residual iron and tire handling accident, etc., must be clean to keep the hole clean, Make the diamond bit work in good environment.Handle the bottom of the foreign body, usually using red, grinding, fishing, sticky and other methods, both time-consuming and unsatisfactory .When the diameter, often a class of fishing does not leave residual alloy sheet, ranging from light So that the drill lip lip groove, the hammer is broken bits.From 1978 onwards, I use the core tube dry drilling method, once (up to twice) can be made of the bottom of the hole foreign body, within an hour to resume normal production.Method is as follows: