US 6,474,423 B2 · Drill bit (A)

Abstract

A drill bit for drilling into earth formations comprising an elongated body having spiral contoured stabilizers for up to a 360-degree stabilization to protect the cutting cones, the elongated body has multiple adjustable openings or nozzles to direct the pressurized fluid medium first to the cutting cone area and bottom of the drill hole to convey the dust and cuttings up the bore hole, a second, adjustable opening or nozzle adds more pressurized fluid means spirally up the contoured annular area in the stabilizer area, and a third, adjustable opening or nozzle at the upper end of the contoured stabilizer to add more pressurized fluid means in the drill pipe annular area to convey the dust and cuttings to the surface of the bore hole, the elongated body has replaceable cutting cones, and bearings and shank assemblies for rebuilding to original specifications.

Claims8

Dependent claims

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.

4 more elements

Dependencies are inferred from the claim text.

Drill bit (A)

Life of this patent

Drill bit (A)

Life of this patent

Abstract

Claims8