US2011180331A1PendingUtilityA1

Rock bit

32
Assignee: TIX CORPPriority: Jan 25, 2010Filed: Mar 22, 2010Published: Jul 28, 2011
Est. expiryJan 25, 2030(~3.5 yrs left)· nominal 20-yr term from priority
Inventors:Nobuhiro Kuribayashi
E21B 17/1092
32
PatentIndex Score
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Claims

Abstract

The present invention provides a rock bit which enables a reduction in surface pressure from a well wall and which allows possible vibration to be suppressed. A first of the present invention provides a rock bit including a bit body with a journal portion, a cone portion configured to be rotatable with respect to the bit body, a bearing portion located between the cone portion and the journal portion, and a seal provided between the cone portion and the journal portion to seal the bearing portion, wherein the cone portion includes a gauge surface that contacts a side wall of a well, and a diamond composite material is preferably disposed extensively and smoothly on the gauge surface. In a second aspect of the present invention, a ring bit is provided at an outer peripheral portion of a bit body. Furthermore, a cone portion of a tri-cone bit includes no gauge tip or surface chip that contacts the side wall of the well but only cemented carbide tips that contact a bottom of the well.

Claims

exact text as granted — not AI-modified
1 . A rock bit comprising:
 a bit body with a journal portion;   a cone portion configured to be rotatable with respect to the bit body;   a bearing portion located between the cone portion and the journal portion; and   a seal provided between the cone portion and the journal portion to seal the bearing portion,   wherein the cone portion includes a gauge surface that contacts a side wall of a well, and a diamond composite material is disposed on the gauge surface.   
     
     
         2 . The rock bit according to  claim 1 , wherein the diamond composite material is disposed on the bit body. 
     
     
         3 . The rock bit according to  claim 1 , further comprising a gauge tip that contacts the side wall of the well, and the diamond composite material is disposed on a part of the gauge tip. 
     
     
         4 . The rock bit according to any one of  claims 1  to  3 , wherein the diamond composite material is disposed by being stacked on cemented carbide. 
     
     
         5 . The rock bit according to any one of  claims 1  to  3 , wherein the diamond composite material is disposed by being stacked, on iron group metal. 
     
     
         6 . A rock bit comprising:
 a tri-cone bit comprising:   a bit body with a journal portion;   a cone portion configured to be rotatable with respect to the bit body;   a bearing portion located between the cone portion and the journal portion; and   a seal provided between the cone portion and the journal portion to seal the bearing portion; and   a cylindrical ring portion fixed to an outer periphery of the tri-cone bit and including a ring bit located at a tip of the ring portion so as to contact a side wall of a well.   
     
     
         7 . The rock bit according to  claim 6 , wherein the diamond composite material is disposed on the ring bit. 
     
     
         8 . The rock bit according to  claim 6  or  7 , wherein the diamond composite material is disposed by being stacked on cemented carbide. 
     
     
         9 . The rock bit according to  claim 6  or  7 , wherein the diamond composite material is disposed by being stacked on iron group metal.

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