US 2016/0237752 A1 · SUBSURFACE DRILLING TOOL

Abstract

An improved subsurface drill bit includes two rotatable cutters disposed between two ear portions of a shank, each of the rotatable cutters having an arcuate face and cutting elements. Cutting edges of the cutting elements, outer surfaces of the ear portions, and protrusions extending outwardly from the shank collectively define a circular configuration to prevent backflow of drilling debris and to prevent wobble of the drill bit in operation. The two rotatable cutters can have an on-load configuration in which each of the cutters is in contact with each other, and an off-load configuration in which each of the cutters is in contact with one of the ear portions. Several improved rotatable cutters are provided. The rotatable cutters can be interchangeable. The drill bit can further include an improved fluid delivery system, including multiple fluid passageways and reverse jets.

Claims23

Dependent claims

A drill bit configured to drill a drill bore, the drill bit comprising:

a shank having a first end configured to operably connect to a drill string;
two ear portions integrally formed to and extending from a second end of the shank, each of the two ear portions having an arcuate outer surface;
two rolling cutters disposed between the two ear portions, each of the two rolling cutters having an arcuate face;
a plurality of cutting elements operably connected to each of the two rolling cutters, each of the plurality of cutting elements having a cutting edge;
and
wherein the cutting edges of a portion of the plurality of cutting elements define a circular configuration.

3 more elements

Dependencies are inferred from the claim text.

Subsurface drilling tool

Life of this patent

Subsurface drilling tool

Life of this patent

Abstract

Claims23