Patent ID: 6279657
Filing Date: 2001-08-28
Classification: E21B

Abstract:
A circulation tool for circulating fluid in a borehole comprising a tubular assembly having an axial through passage between an inlet and a first outlet, a second outlet extending generally transversely of the tubular assembly, and an obturating member moveable relative to the tubular assembly between a first position closing the second outlet and a second position at which the second outlet is open, wherein the obturating member is also moveable between an engaging position at which it is engaged with the tubular assembly and a non-engaging position at which it is not so engaged with the tubular assembly, and wherein when the obturating member is in the said first position it may be in either the said engaging position or the said non-engaging position, wherein when the obturating member is in the engaging position torque imparted to the tubular assembly is transmitted to the obturating member and when the obturating member is in the non-engaging position torque imparted to the tubular assembly it not transmitted to the obturating member.