The structure, operating principle and the features of the fully telescopic retractable bit are described; the prospect of use of the tool in the continental scientific drilling of China and some problems present with it are analysed.
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薛军,何德成,马孝春.全面迭缩式不提钻换钻头技术应用于中国大陆科学钻探的前期研究[J].钻探工程,1998,(2):1-3.Xue Jun He Decheng Ma Xiaochun. Initial Study on The Use of The Fully telescopic Retractable Bit in The Continental Scientific Drilling of China[J]. Drilling Engineering, 1998,(2):1-3.