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不提钻换钻头足一种古老的设想,基于这种设想的专利可追溯到1800年,其后1897年、1898年奥地利、德国都有相似的专利出现。从本世纪30年代以后美、苏、澳、日等国相继设计出多种孔(井)内可更换钻头的钻进装置。不提钻换钻头的基本特点是孔底钻头可以依靠共自身的结构特征,通过某种机构的转换,使其由孔底工作状态转变为传输状态(此时钻头包括扩孔翼的外径小于钻杆的内径)。
Without mentioning drilling and drilling bits, an ancient assumption that patents based on this idea date back to 1800, followed by similar patents in 1897 and 1898 in Austria and Germany. From the 30s of this century, the United States, the Soviet Union, Australia, Japan and other countries have successively designed a variety of holes (wells) can be replaced drill bit drilling device. Without mentioning the basic characteristics of drilling bit change is that the bottom hole drill bit can rely on its own structural features, through a mechanism of conversion, make it from hole bottom work status into transmission state (drill bit at this time, including the outer diameter of the expansion hole is less than Drill pipe diameter).