Drilling tool
A drilling tool (10) includes a pilot bit (14) and a plurality of mills (16) encircling the pilot bit. The pilot bit and the plurality of mills are each driven by a separate, hydraulically powered turbine or positive displacement motor. (20) The drilling tool does not include a transmission for tran...
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Main Authors | , , |
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Format | Patent |
Language | English |
Published |
11.05.2010
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Subjects | |
Online Access | Get full text |
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Summary: | A drilling tool (10) includes a pilot bit (14) and a plurality of mills (16) encircling the pilot bit. The pilot bit and the plurality of mills are each driven by a separate, hydraulically powered turbine or positive displacement motor. (20) The drilling tool does not include a transmission for transmitting power from the turbine or motor to any of the plurality of mills or the pilot bit. |
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Bibliography: | Application Number: US20040988722 |