Patent · US Active

Latchable reaming bit

US7416036B2 · kind B2 · utility

46Cited by

6References

18Claims

0Family size

Assignee

Baker Hughes Holdings LLC · US

Inventors

Ingo Forstner · Ahnsbeck, DE
Angela Durkin · Bø, NO
Troy Miller · Bellville, US
Morten Myhre · Sola, NO

Key dates

Filing date	Apr 14, 2006
Grant date	Aug 26, 2008
Priority date	—
Expiry date	Dec 23, 2026

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/64
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A drilling assembly supports a liner for making a wellbore. The BHA comprises a pilot bit and a reamer above it that is larger in diameter than the suspended liner. If the BHA needs to be pulled out, the reamer is brought into contact with the liner and a latch mechanism between the two engages as another latch that had held the reamer bit to the BHA is released. The reamer bit stays with the liner as the BHA is pulled and later reinserted. On the way in the BHA latches to the reamer bit which then unlatches from the liner bottom. Preferably, splines and a shoulder on the BHA are used to drive the reamer bit as opposed to any power being transmitted through the latch between the BHA and the reamer bit. However, the latch mechanism between the BHA and the reamer bit could also provide torque and weight on bit for drilling operations. The process may be repeated.

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