Hydraulic operated underreamer

Details Hydraulic operated underreamer Hydraulic operated underreamer

1988-06-28

1989-12-26

Dang, Hoang C.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175271, 175285, 175288, E21B 728

Patent

active

048891975

ABSTRACT:
A hydraulically operated underreamer or reamer for enlargement of boreholes is to be connected to a rotating drill string. An outer movable cylinder extends the entire length of the reamer for protection of inner parts thereof. Cutter support arms are movable rectilinearly between an operative state whereat they extend from the cylinder and a closed state whereat they are completely retracted within the cylinder. Cutters are mounted on the support arms and are rectilinearly movable with support arms through openings in the cylinder.

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