Patent ID: 7441607

Claim:
A tool for circulating fluid in a well bore, the tool comprising: a tubular assembly having a through passage between an inlet and a first outlet, the inlet and first outlet being adapted for connection in a work string, a second outlet extending generally transversely of the tubular assembly; an obturating member moveable between a first position closing the second outlet and a second position permitting fluid flow through the second outlet, the obturating member including restraining means to actively retain the obturating member independently in the first and the second positions; an engagement mechanism actuable between an engaged configuration, in which the obturating member is locked in one of the first or second positions, and a disengaged configuration in which the obturating member can move to the other of the first and second positions; and a fluid pressure actuation surface coupled to the engagement mechanism and biased by a spring located between the tubular assembly and the engagement mechanism; wherein variation of fluid pressure on the actuation surface controls actuation of the engagement mechanism between the engaged and disengaged configurations; and wherein, with the engagement mechanism in the disengaged configuration and the obturating member in the first position, an upstroke of the tool, putting the tool in tension, moves the obturating member to the second position, thereby permitting fluid flow to the second outlet; and further wherein, with the engagement mechanism in the disengaged configuration and the obturating member in the second position, a downstroke of the tool, putting the tool in compression, moves the obturating member to the first position, thereby closing the second outlet.