Cross-over tool return port cover

Details Cross-over tool return port cover Cross-over tool return port cover

2006-01-03

2006-01-03

Neuder, William (Department: 3672)

Wells

Processes

Graveling or filter forming

C166S051000, C166S334400

Reexamination Certificate

active

06981551

ABSTRACT:
The present invention provides a return port cover that can close and open a return port separate from tubing movement caused by stretching or contracting under stress or other induced pipe movement from downhole conditions. For example, the return port cover can assist in preventing pack “fluffing” by preventing unintended fluid communication through an associated downhole tool regardless of the position of a circulating valve means. The return port cover can be biased, so that in one position it closes the port and in another position opens the port based on relative tubing placement at different portions of the fracturing operation or other well treatment operations.

REFERENCES:
patent: 4428428 (1984-01-01), Smyrl et al.
patent: 5597040 (1997-01-01), Stout et al.
patent: 5609204 (1997-03-01), Rebardi et al.
patent: 5676208 (1997-10-01), Finley
patent: 6397949 (2002-06-01), Walker et al.
patent: 2003/0019634 (2003-01-01), Henderson et al.
patent: 2003/0192694 (2003-10-01), Zachman et al.

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