This paper presents a historical view and present status of retractable bit design and drilling results. Despite the significant improvements in cone-sealed bearing rock bits, the special features of retractable bits provides a wider range of field applications. Scientific drilling, both continental and offshore and stratigraphic offshore boreholes, is an area for profitable application of retractable bits with a downhole motor. Another promising application is drilling and simultaneous casing where some prototypes have been successfully tested. Other applications such as horizontal and geothermal drilling look promising for future developments.
Issue Section:
Technical Papers
1.
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2.
Camp
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Barshay, G. S., Gelfgat, Ya. A., Romanov, A. Z., 1967, “Turbodrilling Without Pulling Out the Pipes,” Moscow, Nedra.
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Gelfgat, M. Ya., Alikin, R. S., Stanko, Ya. P., 1990, “Technology of Ultradeep Core Drilling Without Pulling Out Drill Pipes,” Super-Deep Continental Drilling and Deep Geophysical Sounding, Springer-Verlag Berlin, Heidelberg.
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