Apparatus and method for drilling and reaming a borehole

Details Apparatus and method for drilling and reaming a borehole Apparatus and method for drilling and reaming a borehole

2006-08-01

2006-08-01

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

C175S406000

Reexamination Certificate

active

07083010

ABSTRACT:
A drilling assembly, a reamer, and an adjustable diameter stabilizer are disclosed. The reamer includes cutter elements mounted on at least a first fixed blade for reaming a previously-formed borehole or for forming a borehole of increased diameter beneath an existing cased borehole. The apparatus provides for stabilizing the drilling assembly so that the reamer may be used in back reaming the hole. Retainer means, such as shear pins or spring-biased reciprocating latch members, are provided to prevent premature extension of the adjustable diameter stabilizer's moveable members, including blades and pistons. The shear pins are preferably accessible from the outer surface of the reamer housing so as to expedite field replacement of the shear pins without requiring disassembly of the reamer. The spring-biased latching members repeatedly latch and unlatch so that field replacement is not required, and so that the movable members may be extended and contracted multiple times while the reamer is downhole.

REFERENCES:
patent: 4491187 (1985-01-01), Russell
patent: 5293945 (1994-03-01), Rosenhauch et al.
patent: 5402856 (1995-04-01), Warren et al.
patent: 5765653 (1998-06-01), Doster et al.
patent: 5788000 (1998-08-01), Maury et al.
patent: 5931239 (1999-08-01), Schuh
patent: 6059051 (2000-05-01), Jewkes et al.

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