Actuator underreamer

Details Actuator underreamer Actuator underreamer

2005-12-20

2005-12-20

Neuder, William (Department: 3672)

Boring or penetrating the earth

Cutter element laterally shiftable below ground

C175S292000

Reexamination Certificate

active

06976547

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 an actuator partially slidably positioned in the housing. The actuator comprises a first portion and a second portion. A cross-sectional area of the second portion is larger than a cross-sectional area of the first portion. The underreamer includes at least one cutter set, wherein each cutter set has a first end and a second end. The first end of each cutter set is pivotally coupled to the housing. The second end of each cutter set is pivotally coupled to a connector. An axial force applied to the actuator is operable to slide the actuator relative to the housing causing the second portion of the actuator to contact each cutter set and extend each cutter set radially outward relative to the housing from a retracted position to a first position. The actuator may also include a stop member proximate an end of the actuator. The stop member may be operable to force the connector to slide relative to the housing during the application of the axial force, causing each cutter set to further extend radially outward relative to the housing from the first position to a second position.

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