دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a downhole tool with rough, sharp, extremely hard cutting surfaces for removing metal, packers. cement, sand, or scale by grinding or cutting. Mills are run on drill pipe or tubing to grind up debris in the hole, remove stuck portions of drill stem or sections of casing for sidetracking, and ream out tight spots in the casing. They are also called junk mills. reaming mills. and so forth, depending on their use. v: to use a mill to cut or grind metal objects that must be removed from a well.

n: a downhole tool with rough,sharp cutting surfaces for removing metal by grinding or cutting.

a cutting tool used to grind up metal, dress off a fish, or open up a window for a kick-off.

n: a section of a borehole in which excessive wall cake has built up, reducing the hole diameter and making it difficult to run the tools in and out. Compare keyseat.

n: The well section that its diameter reducing because mud cake over thick or layer swelling.

a restricted place in the bore hole, caused by wall cake, dog leg, deviation change or other factor.