Hydraulic up-down well jar and method of operating same

Details Hydraulic up-down well jar and method of operating same Hydraulic up-down well jar and method of operating same

1989-10-11

1991-04-16

Kisliuk, Bruce M.

Wells

With jar means for releasing stuck part

166301, 175297, E21B 31113

Patent

active

050074792

ABSTRACT:
A hydraulic jar for use in a well and a method of operating same in which an outer housing assembly extends around an inner mandrel assembly in a coaxial relation thereto to define two fluid chambers separated by a piston. The housing assembly is movable relative to the mandrel assembly to force the fluid from one of the chambers to the other. The fluid flow rate is varied between a relative low flow rate and a relative high flow rate in response to the relative position of the housing assembly causing corresponding movement at the latter assembly. A high impact load is transferred to a member connected to the jar in response to a movement at the relatively high flow rate. The jar can be used to create a high impact load in both an upward direction and a downward direction.

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