Retractable Bits Development and Application

[+] Author and Article Information
M. Gelfgat

Aquatic Company Ltd., 7-9 Letnikovskaya Street, Moscow, 113114 Russia

R. Alikin

Drilling Techniques Research Institute (VNIIBT), Moscow, 113114 Russia

J. Energy Resour. Technol 120(2), 124-130 (Jun 01, 1998) (7 pages) doi:10.1115/1.2795022 History: Received March 21, 1997; Revised February 11, 1998; Online November 06, 2007


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.

Copyright © 1998 by The American Society of Mechanical Engineers
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