Underreamer with adjustable arm extension

Details Underreamer with adjustable arm extension Underreamer with adjustable arm extension

1982-09-09

1984-07-10

Leppink, James A.

Wells

Processes

Cementing, plugging or consolidating

166286, 166269, 74526, E21B 1032

Patent

active

044587619

ABSTRACT:
An underreamer having an adjustable arm extension includes a cam for urging the arm outwardly in an opened position, and a stop pin which engages a slot in the arm for limiting the maximum arm extension. An insert for the arm has a surface which overlaps a portion of the slot to establish an effective length for the slot. By changing the configuration of the surface on the insert, the arm extension can be adjusted.

REFERENCES:
patent: Re19281 (1934-08-01), Schroeder
patent: 402394 (1889-04-01), Brown
patent: 1500001 (1924-07-01), Rogers
patent: 2485826 (1949-10-01), Harinck
patent: 2699921 (1955-01-01), Garrison
patent: 3171503 (1965-03-01), Shirley
patent: 3750771 (1973-08-01), Cugini
patent: 3894590 (1975-07-01), Takano et al.
patent: 4282941 (1981-08-01), Perkin
patent: 4337764 (1982-06-01), Lerman

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