Drilling tool
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United States of America Patent
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May 11, 2010
Issued Date -
N/A
app pub date -
Nov 15, 2004
filing date -
Nov 15, 2004
priority date (Note) -
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Abstract
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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