Patent · US Active

Dual string orbital drilling system

US7896108B2 · kind B2 · utility

2Cited by

19References

6Claims

0Family size

Inventors

Robert E. Able · Bozeman, US
Charles C. Able · Cambridge, US

Key dates

Filing date	Mar 6, 2009
Grant date	Mar 1, 2011
Priority date	—
Expiry date	Jun 6, 2029

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B17/18
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A dual string drilling system for drilling a well bore in an earth formation, having a rotatable, tubular outer drill string and an upper rotatable, tubular inner drill string. An elongate tubular drill bit is mounted to a distal end of the outer drill string. The tubular drill bit having an interior passageway having a longitudinal axis which is inclined with respect to the longitudinal axis of the outer drill string. The drill bit is further provided with a cutaway portion extending through a wall of the tubular outer drill string. A lower rotatable inner drill string is coupled to the upper rotatable tubular inner drill string and is disposed within the interior passageway of the drill bit. A second drill bit is mounted to the distal of the lower inner drill string and is sized to extend beyond the drill bit mounted to the outer drill string.

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