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Roller bit rearing wear detection system and method

  • US 6,631,772 B2
  • Filed: 08/21/2001
  • Issued: 10/14/2003
  • Est. Priority Date: 08/21/2000
  • Status: Expired due to Fees
First Claim
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1. A system for detecting the wear of a roller bit bearing, comprising:

  • a roller drill bit body having at least one bearing and a drilling fluid outlet selectively having drilling fluid flow therethrough;

    a roller bit rotatably attached to the roller drill bit body at the bearing and adjacent the drilling fluid outlet, wherein the roller bit includes a channel therein; and

    a valve-plug removably fitted in the drilling fluid outlet of the roller drill bit body and extending into the channel of the roller bit, wherein uneven rotation of the roller bit causes the valve-plug to impact the sides of the channel and removal of the valve-plug from the drilling fluid outlet thereby causing drilling fluid to flow through the drilling fluid outlet.

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