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Pilot mills are recommended for milling washpipe, safety joints, crossover swages and washover shoes.
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Liner hangers can be milled efficiently, eliminating inside cuts and running spears. The nose, or pilot, can be dressed to mill out junk which may be encountered. Pilot mills can be used to mill:
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- Adapters
- Casing
- Liners
- Washpipe
- Drill pipe
- Swaged casing
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General Guidelines for Using Pilot Mills
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In selecting a pilot mill, the blade OD should be about 1 ⁄4 in. larger than the OD of the tool joint or coupling to be milled. The pilot OD should be the same as the drift diameter of the tubular.
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