Automatic hydraulic thruster

Details Automatic hydraulic thruster Automatic hydraulic thruster

1985-05-24

1986-10-07

Novosad, Stephen J.

Boring or penetrating the earth

With expansible bore wall anchor

137864, 175325, 175 94, E21B 3400, E21B 418

Patent

active

046154019

ABSTRACT:
Automatic Hydraulic Thruster for hole boring including a mandrel and sleeve forming two expandable chambers with plural wall anchor means annularly disposed about the sleeve responsive to pressure differential between one chamber and the bore hole pressure and three-way valve means for automatically connecting the chambers respectively first with mandrel pressure and bore hole pressure and then vice versa.

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patent: 4205784 (1980-06-01), Monigold

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