US2011226533A1PendingUtilityA1

Progressive cutter size and spacing in core bit inner diameter

30
Assignee: BAKER HUGHES INCPriority: Mar 22, 2010Filed: Mar 22, 2010Published: Sep 22, 2011
Est. expiryMar 22, 2030(~3.6 yrs left)· nominal 20-yr term from priority
Inventors:Nathaniel R. Adams
E21B 10/48
30
PatentIndex Score
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Cited by
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References
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Claims

Abstract

A core drilling bit comprising a tubular body having an inner diameter, an outer diameter, and a leading face spanning from the inner diameter to the outer diameter; and a plurality of cutters mounted in the face; wherein cutters mounted along the inner diameter vary in configuration. For example, the cutters may be progressively larger along the inner diameter. The interior edges of the cutters along the inner diameter may be aligned in a circle with their outer edges being aligned in a spiral. The leading edges of the cutters along the inner diameter may be aligned at a constant depth, a progressively shallower depth, or a progressively deeper depth. The cutters may be spaced progressively wider or narrower along the inner diameter.

Claims

exact text as granted — not AI-modified
1 . A core drilling bit comprising:
 a tubular body having an inner diameter, an outer diameter, and a leading face spanning from the inner diameter to the outer diameter; and   a plurality of cutters mounted to the face;   wherein cutters mounted along the inner diameter vary in configuration.   
     
     
         2 . The bit of  claim 1 , wherein the cutters are progressively larger along the inner diameter. 
     
     
         3 . The bit of  claim 2 , wherein interior edges of the cutters along the inner diameter are aligned in a circle. 
     
     
         4 . The bit of  claim 2 , wherein outer edges of the cutters along the inner diameter are aligned in a spiral. 
     
     
         5 . The bit of  claim 2 , wherein leading edges of the cutters along the inner diameter are aligned at a constant depth. 
     
     
         6 . The bit of  claim 2 , wherein leading edges of the cutters along the inner diameter are aligned at a progressively shallower depth. 
     
     
         7 . The bit of  claim 2 , wherein leading edges of the cutters along the inner diameter are aligned at a progressively deeper depth. 
     
     
         8 . The bit of  claim 1 , wherein the cutters are spaced progressively wider along the inner diameter. 
     
     
         9 . The bit of  claim 1 , wherein the cutters are spaced progressively narrower along the inner diameter. 
     
     
         10 . A core drilling bit comprising:
 a tubular body having an inner diameter, an outer diameter, and a leading face spanning from the inner diameter to the outer diameter; and   a plurality of cutters mounted to the face;   wherein cutters mounted along the inner diameter are sized and spaced differently along the inner diameter.   
     
     
         11 . The bit of  claim 10 , wherein the cutters are progressively larger along the inner diameter. 
     
     
         12 . The bit of  claim 11 , wherein interior edges of the cutters along the inner diameter are aligned in a circle. 
     
     
         13 . The bit of  claim 11 , wherein outer edges of the cutters along the inner diameter are aligned in a spiral. 
     
     
         14 . The bit of  claim 11 , wherein leading edges of the cutters along the inner diameter are aligned at a constant depth. 
     
     
         15 . The bit of  claim 11 , wherein leading edges of the cutters along the inner diameter are aligned at a progressively shallower depth. 
     
     
         16 . The bit of  claim 11 , wherein leading edges of the cutters along the inner diameter are aligned at a progressively deeper depth. 
     
     
         17 . The bit of  claim 10 , wherein the cutters are spaced progressively wider along the inner diameter. 
     
     
         18 . The bit of  claim 10 , wherein the cutters are spaced progressively narrower along the inner diameter. 
     
     
         19 . A core drilling bit comprising:
 a tubular body having an inner diameter, an outer diameter, and a leading face spanning from the inner diameter to the outer diameter; and   a plurality of cutters mounted in the face;   wherein cutters mounted along the inner diameter are progressively larger and spaced progressively wider along the inner diameter.   
     
     
         20 . The bit of  claim 19 , wherein interior edges of the cutters along the inner diameter are aligned in a circle and outer edges of the cutters along the inner diameter are aligned in a spiral.

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