Double-acting jar compounder

Details Double-acting jar compounder Double-acting jar compounder

2011-03-15

2011-03-15

Neuder, William P (Department: 3672)

Wells

Processes

Freeing stuck object, grappling or fishing in well

C166S178000, C175S296000

Reexamination Certificate

active

07905289

ABSTRACT:
A double-acting compounder is disclosed having a first end and a second end, and comprising an outer housing, an upper mandrel, and a lower mandrel. The outer housing defines the first end. The upper mandrel is at least partially disposed telescopically within the outer housing to define an uphole fluid chamber between the upper mandrel and the outer housing, the upper mandrel defining the second end. The lower mandrel is at least partially disposed telescopically within the outer housing to define a downhole fluid chamber between the lower mandrel and the outer housing. The uphole fluid chamber and the downhole fluid chamber each contain fluid, have a variable stroke-dependent volume, and are sealed at an uphole end and a downhole end. The upper mandrel has a first shoulder engagable with and facing a second shoulder of the lower mandrel to move the lower mandrel during at least a portion of a stroke.

REFERENCES:
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patent: 5584353 (1996-12-01), Chancey et al.
patent: 5918689 (1999-07-01), Roberts
patent: 5931242 (1999-08-01), Oettli
patent: 6202767 (2001-03-01), Friis
patent: 2005/0284665 (2005-12-01), Shears et al.

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