| 摘要 |
A damper for downhole tools consisting of a plurality of damping inserts arrayed about the tool body so that their radial protrusion describes a circumference greater than desired gauge of the borehole. The damper inserts are configured with rounded working surfaces that radially protrude from the tool body and are coated with an abrasion resistant, superhard material. The damper inserts are progressively arrayed so that they are constantly forced against the walls of the borehole. In this manner, they may plastically fail the formation by an indenting, brinelling, or crushing action that produces a constant torsional load on the downhole tools, and controls the torsional unloading of the downhole tools and absorbs the vibrations of the drilling tool as the formation is being drilled.
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