Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Reexamination Certificate
2005-07-26
2005-07-26
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Enlargement of existing pilot throughbore requiring...
C175S057000, C175S269000, C175S399000, C175S406000
Reexamination Certificate
active
06920944
ABSTRACT:
A drilling assembly and an eccentric, adjustable diameter reamer 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 method and apparatus provide 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 reamer'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.
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Eppink Jay M.
Odell, II Albert C.
Conley & Rose, P.C.
Dang Hoang
Halliburton Energy Service,s Inc.
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