Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Reexamination Certificate
2006-04-14
2008-08-26
Gay, Jennifer H (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Bit with leading portion forming smaller diameter initial bore
C175S406000, C175S257000
Reexamination Certificate
active
07416036
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.
REFERENCES:
patent: 1391626 (1921-09-01), Gilthorpe
patent: 3190378 (1965-06-01), Davey, Sr.
patent: 3945444 (1976-03-01), Knudson
patent: 5284216 (1994-02-01), Brungs et al.
patent: 5472057 (1995-12-01), Winfree
patent: 5957224 (1999-09-01), Ilomaki
patent: 2155540 (1973-05-01), None
patent: 1006260 (2000-06-01), None
patent: WO02/059448 (2002-08-01), None
patent: WO03/001022 (2003-01-01), None
Durkin Angela
Forstner Ingo
Miller Troy
Myhre Morten
Baker Hughes Incorporated
Fuller Robert E
Gay Jennifer H
Rosenblatt Steven
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