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Method to control bit load

  • US 8,240,397 B2
  • Filed: 07/07/2009
  • Issued: 08/14/2012
  • Est. Priority Date: 07/07/2009
  • Status: Expired due to Fees
First Claim
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1. A method of controlling loading on a drill bit drilling a hole having an inner diameter with a drilling tube having an outer diameter and an internal bore, comprising:

  • an annular area between said outer diameter of said drilling tube and said inner diameter of said hole being drilled,circulating drilling fluids from said proximate location to said distal location in said annular area,loading said drill bit against the end of said hole to be drilled with pressure from the flow of said drilling fluids, andlimiting said bit load by venting a portion of said flow within said annular area into said internal bore of said drilling tube.

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