Top Dress mill and polishing mills are run prior to tying seal nipple or seal nipple packer assembly back into the Polish bore receptacle. The purpose of running the mills is to ensure tie back nipple assembly not to be damaged, and to remove any scale or other foreign substance from the polished seal bore. The Top Dress Mill is made to dress the top edge of the receptacle to an acceptable condition and configuration to ensure safe entry of the seal nipple without damaging the seal units. The polishing mill is a soft-bodied mill which run inside the receptacle to clean a deposited material from its highly polished surface to allow optimal contact with the seal nipple.
For seal nipple packer applications, the mills are run in with a casing scraper to assure a prepared area for the packer to set and seal in. Both mills are equipped with drill-pipe connections and are sized for specific lengths by the use of a spacer nipple. Detailed procedures for dressing and polishing are available.
Top Dress Mill For Clean Out Trip OM-TDM
Spacer Tube For Clean Out Trip OM-SPT
Clean Out Blade Mill For Clean Out Trip OM-CBM
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