Patent ID: 6474423
Filing Date: 2002-11-05
Classification: E21B

Abstract:
A drill bit comprising:an upper portion and a lower portion; said upper portion being threaded for attachment to a drill string; said lower portion having means for cutting a bore hole in an earth formation; spaced apart stabilizers spirally arranged on said lower portion providing stabilization in said bore hole; a concave contoured annular area between said spirally arranged stabilizers; adjustable nozzles providing pressurized fluid jets at multiple zones in said lower portion; said adjustable nozzles being adjusted to provide the greatest volume and pressure of fluid at the bottom of said bore hole for cleaning and debris removal thereat with lesser volume and pressure at the mid-zone and upper zone levels for aiding in movement of debris and fluid to the surface by creating a propeller effect as the debris and fluid are forced up toward the surface through the concave contoured annular areas located between the spirally arranged stabilizers.