An experimental study of friction induced by PDC cutters during rock cutting

Document Type

Conference Proceeding

Publication Date

1-1-1992

Abstract

A nev laboratory instrument was used to measure friction between the sliding surface of a polycrystalline diamond compact (PDC) cutter and the surface of a rock. The Instrument is unique among other means for studying friction which employed standard machine-shop tools for cutting metals (lathes, milling machines, drills) with rigid imposition of normal force and no instantaneous exposure of the freshly cut rock surface. The measurable variables Include rotary speed of the rock, normal and tangential forces, and composition of the circulating liquid. Water, water-base mud, and oil base mud were used to investigate lubricant effect on the eliding friction forces. Lithology effect was investigated bu using samples of Berea Sandstone, Nugget Sandstone, Mancos Shale, and Sierra-White Granite. Friction forces were Insensitive to any change in lithology and lubricants within the tested range of materials- The interaction between borehole fluid and rock seems to be controlling mechanism of friction though the friction coefficient value is little affected.Measured friction coefficients were independent from normal forces, thus satisfying Amonton's law of friction. Friction coefficient either decreased or remained same with increasing sliding speed. The effect of sliding speed is more pronounced for the weaker, coarse grained rocks.

Publication Source (Journal or Book title)

Annual Technical Meeting 1992

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