Drilling tool
A drilling tool includes a pilot bit and a plurality of mills 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. The drilling tool does not include a transmission for transmitting power from...
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| Main Authors | , , |
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| Format | Patent |
| Language | English |
| Published |
11.05.2010
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| Online Access | Get full text |
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| Summary: | A drilling tool includes a pilot bit and a plurality of mills 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. 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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