Carbide Downhole Tool

A carbide downhole tool comprises a tubular body for location in a tubular member, such as a drill string, and defines a through bore and a number of circumferentially spaced ports . A valve member which may be in the form of a piston sleeve is mounted in the bore and is movable relative to the body between a first position in which fluid may flow through the port and a second position in which the valve member closes the port , the valve member being movable between the first and second positions by application of differential fluid pressure. Movement of the valve member is provided by a cam arrangement including a circumferentially extending cam groove and a cam follower .


A method for fabricating a carbide composite for a downhole tool, comprising: depositing a first layer on a substrate, the first layer comprising one or more first carbides, first metal binders, first organic binders, or a combination thereof; depositing a second layer at least partially adjacent the first layer, the second layer comprising one or more second carbides, second metal binders, second organic binders, or a combination thereof, and wherein the first and second layers have a different particle size, particle shape, carbide concentration, metal binder concentration, or organic binder concentration from one another; and binding the first and second layers to form the carbide composite.


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