Filter sub

Boring or penetrating the earth – With well-type screen

Reexamination Certificate

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Details

C166S227000

Reexamination Certificate

active

07926595

ABSTRACT:
A downhole filter with a filter housing having a top filter and a bottom filter disposed therein. The filter housing can be in fluid communication with each filter. Each filter can be in fluid communication with a burst disk housing having a burst disk module and a burst disk. Each burst disk housing can be in fluid communication with the filter housing. Fluid can flow through the filter housing and through the filter. When a filter is clogged, the fluid can burst a burst disk, thereby bypassing the filter. The downhole filter can include a middle sub in fluid communication with the top filter and a second portion of the filter housing. The middle sub can threadably engage a bottom burst disk housing.

REFERENCES:
patent: 7243740 (2007-07-01), Frith
patent: 2005/0121233 (2005-06-01), Frith
patent: 2009/0255878 (2009-10-01), Himmel

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