Boring or penetrating the earth – Cutter element laterally shiftable below ground
Reexamination Certificate
2005-11-08
2005-11-08
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
C166S267000
Reexamination Certificate
active
06962216
ABSTRACT:
An underreamer for forming a cavity from within a well bore includes a housing adapted to be disposed within the well bore. The underreamer includes at least one cutter, wherein each cutter has a first end and a second end. The first end of each cutter is pivotally coupled to the housing. The underreamer also includes an actuator slidably positioned in the housing, wherein the actuator has a first end and a second end. The underreamer includes an enlarged portion of the actuator proximate the second end of the actuator. A first axial force applied to the actuator is operable to slide the actuator relative to the housing causing the enlarged portion to contact each cutter and extend the second end of each cutter radially outward relative to the housing from a retracted position to a first position. A second axial force applied to the underreamer may be operable to further extend the second end of each cutter radially outward relative to the housing from the first position to a second position.
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Bagnell David
CDX Gas, LLC
Stephenson Daniel
LandOfFree
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