FLUID VELOCITY-DRIVEN CIRCULATION TOOL

摘要

Apparatus for diverting fluid flow out of a working string, having a primary sub housing defining an axial bore and one or more primary sub housing circulation ports; a valve within the housing and defining one or more valve circulation ports. The valve ports are in fluid communication with the housing ports when the valve is in an open circulation position. One or more fluid-impinged surfaces are included and disposed within the primary sub housing and in operative connection with the valve. Fluid flowing through the primary sub housing impinges upon the fluid-impinged surfaces and, at a sufficient flow rate, causes the valve to move so as to actuate the valve in opposition to a biasing force operating on the valve and into open circulation position to cause flow of fluid out of the valve and primary sub housing through the aligned valve and primary housing ports.