US 6,719,073 B2 · Single-cone rock bit having cutting structure adapted to improve hole cleaning, and to reduce tracking and bit balling

Abstract

A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string, a bearing journal depending from the bit body and a single roller cone rotatably attached to the journal. The roller cone has a plurality of inserts disposed thereon. In one aspect, the inserts have an extension length of at least 0.6 inches. A roller cone drill bit is disclosed, including a bit body, a bearing journal depending from the bit body, and a single roller cone rotatably attached to the journal. The roller cone has a plurality of inserts disposed thereon. In another aspect, the inserts are arranged such that at most about 20 percent of the inserts are crossed substantially at centerlines thereof by any single plane which contains the axis of the cone axis 10 and which crosses at least two of the inserts.

Claims54

Dependent claims

A roller cone drill bit, comprising:

a bit body adapted to be coupled to a drill string;
a bearing journal depending from the bit body;
and
a single roller cone rotatably attached to the bearing journal, the roller cone having a plurality of inserts disposed at selected positions thereon, the journal defining a rotation angle with respect to an axis of rotation of the bit such that the roller cone includes an intermittent contact zone and a continuous contact zone thereon, at least one of the inserts disposed in the continuous contact zone made from a super hard material,
wherein the inserts are arranged in a plurality of substantially helical columns.

2 more elements

Dependencies are inferred from the claim text.

Single-cone rock bit having cutting structure adapted to improve hole cleaning, and to reduce tracking and bit balling

Life of this patent

Single-cone rock bit having cutting structure adapted to improve hole cleaning, and to reduce tracking and bit balling

Life of this patent

Abstract

Claims54