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Title:
FUNCTIONALLY GRADIENT COMPOSITE ARTICLE
Document Type and Number:
WIPO Patent Application WO/2012/149007
Kind Code:
A3
Abstract:
A composite downhole article is disclosed. The article is selectively corrodible in a wellbore fluid. The article includes at least one corrodible core member comprising a first material that is corrodible in a wellbore fluid at a first corrosion rate. The article also includes at least one outer member disposed on the core member and comprising a second material that is corrodible in the wellbore fluid at a second corrosion rate, wherein the corrodible core member has a composition gradient or a density gradient, or a combination thereof, and wherein the first corrosion rate is substantially greater than the second corrosion rate.

Inventors:
XU ZHIYUE (US)
JOHNSON MICHAEL (US)
Application Number:
PCT/US2012/034978
Publication Date:
January 17, 2013
Filing Date:
April 25, 2012
Export Citation:
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Assignee:
BAKER HUGHES INC (US)
XU ZHIYUE (US)
JOHNSON MICHAEL (US)
International Classes:
E21B21/08; E21B41/02; E21B43/22
Domestic Patent References:
WO2009079745A12009-07-02
Foreign References:
US20070299510A12007-12-27
US20100294510A12010-11-25
US5607017A1997-03-04
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