Hydraulic jars for bore hole drilling

Details Hydraulic jars for bore hole drilling Hydraulic jars for bore hole drilling

1977-01-26

1978-03-28

Leppink, James A.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175301, E21B 110

Patent

active

040810437

ABSTRACT:
Hydraulic jar apparatus to be disposed in a drilling string used in drilling a well bore or other bore hole, embodying inner and outer telescopically arranged bodies, with a hammer on the inner body adapted to strike an anvil on the outer body, the bodies being initially releasably locked or interconnected in fully telescoped or contracted relation by a locking device which can be released while the apparatus is in the bore hole before the apparatus can function as a jarring device or a bumper sub.

REFERENCES:
patent: 2029609 (1936-02-01), Burns et al.
patent: 2876993 (1959-03-01), Hooks
patent: 3406770 (1968-10-01), Anterbury et al.
patent: 3912026 (1975-10-01), Crowe et al.

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