Patent · US Active

Apparatus and methods for drilling wellbores that utilize a detachable reamer

US8056649B2 · kind B2 · utility

0Cited by

9References

20Claims

0Family size

Assignee

Baker Hughes Holdings LLC · US

Inventors

Joachim Treviranus · Winsen (Aller), DE
Sven Kreuger · Winsen (Aller), DE

Key dates

Filing date	Aug 28, 2008
Grant date	Nov 15, 2011
Priority date	—
Expiry date	Feb 9, 2029

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B23/02
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

An apparatus for use in a wellbore is provided that in one aspect includes: a drilling assembly configured to carry a first drill bit at an end thereof, a second drill bit disposed uphole of the first drill bit, and a connection device that is configured to selectively connect the second drill bit to the drilling assembly and disconnect the second drill bit from the drilling assembly.

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