Patent · US Active

Steerable underreamer/stabilizer assembly and method

US7513318B2 · kind B2 · utility

73Cited by

39References

23Claims

0Family size

Assignee

SMITH INTERNATIONAL, INC. · US

Inventors

Lance D. Underwood · Cypress, US
Charles H. Dewey · Houston, US

Key dates

Filing date	Jan 18, 2006
Grant date	Apr 7, 2009
Priority date	—
Expiry date	Sep 10, 2026

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B17/1014
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A bottom hole assembly includes a drill bit, a stabilized underreamer assembly located behind the drill bit, and a drilling assembly. A method to drill a formation includes positioning a stabilized underreamer assembly behind a drill bit, positioning a drilling assembly behind the stabilized underreamer assembly, and rotating the drill bit and stabilized underreamer assembly with the drilling assembly. A stabilized underreamer located between a directional drilling assembly and a drill bit includes at least one arm assembly extending from the stabilized underreamer assembly, wherein the arm assembly includes a stabilizer portion and an underreamer cutting structure.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.