Title:
MATERIAL SENSITIVE DOWNHOLE FLOW CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO2008079777
Kind Code:
B1
Abstract:
A screen section (1) has a valve assembly to control flow through it. The valve is open and has a closure spring held compressed by a shape memory or swelling material (6) that responds to the presence of a specific well fluid or fluids so that its property changes to allow the spring (7) to deliver the stored potential energy to the valve member to close it when the specific well fluid or fluids are detected. The preferred material is a shape memory polymer that, for example, is sensitive to the presence of water or methane and gets softer to release the potential energy source to operate the downhole tool.
Inventors:
O'MALLEY EDWARD J (US)
RICHARD BENNETT
RICHARD BENNETT
Application Number:
PCT/US2007/087780
Publication Date:
October 09, 2008
Filing Date:
December 17, 2007
Export Citation:
Assignee:
BAKER HUGHES INC (US)
O'MALLEY EDWARD J (US)
RICHARD BENNETT
O'MALLEY EDWARD J (US)
RICHARD BENNETT
International Classes:
E21B34/08; E21B23/04; E21B34/14; E21B43/08
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