Downhole rotary cutting tool

摘要: A rotary cutting tool, which may be a reamer for enlarging an underground borehole or mill to remove tubing by into the inside wall of tubing, has plurality cutter assemblies distributed azimuthally around longitudinal axis wherein each assembly includes supporting structure bearing sequence cutters extends axially along tool with leading surfaces facing in direction rotation tool. The are positioned at circumferential positions such that no more than three aligned on any line parallel In overlapping arrangement, have face circumferentially behind but ahead trailing end least one other cutter.