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Tri-cone bit for high RPM drilling applications

  • US 9,238,944 B2
  • Filed: 03/09/2011
  • Issued: 01/19/2016
  • Est. Priority Date: 03/09/2010
  • Status: Active Grant
First Claim
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1. A tri-cone bit for high RPM drilling applications comprising three head sections and three cones each of which is attached at a lower end of the corresponding head section, wherein upper parts of the three head sections are joined together to form a bit body, on which nozzle sockets are provided, and nozzles are installed in bores of the nozzle sockets, being characterized in that a bearing between the cones and the head sections is a composite roller-journal bearing which is formed by rollers and arc-shaped slides arranged in an alternating way, and a seal means for the bearing is of metal face type, wherein a radial thickness of the slides is larger than a diameter of the rollers by 0.03 to 2.00 mm;

  • wherein oil grooves are provided at both internal and external arc surfaces of the slide, said oil grooves extend from one circumferential end side of the slide to the other circumferential end side of the slide, and the oil grooves at the internal arc surface of the slide are parallel with each other, and the oil grooves at the external arc surface of the slide are parallel with each other, andwherein the oil grooves on internal arc surface of the slide are positioned and oriented to form an interlaced pattern with the oil grooves on the external arc surface of the slide;

    wherein cutting elements arranged on the cones include primary cutting elements, which are convex crested inserts whose crest is formed by a convex curve surface, and heel row cutting elements, which are wedge or spherical inserts.

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