Patent ID: 9366106
Filing Date: 2016-06-14
CPC Classification: B05D,B22F,B33Y,E21B,Y10T

Claim Text:
1. A method of making a composite downhole article, comprising: forming at least one removable core member comprising a first metallic material that is removable in a wellbore fluid at a first removal rate; and disposing at least one outer member on the core member, the outer member comprising a second material that is removable in the wellbore fluid at a second removal rate, wherein the removable core member has a composition gradient or a density gradient, or a combination thereof, and wherein the first removal rate is substantially greater than the second removal rate, and wherein disposing the outer member on the core member further comprises forming an access point on the outer member, the access point configured to provide access of a wellbore fluid to the core member in response to a change in a wellbore condition, and wherein the access point comprises a localized thinning of the outer member.