| 摘要 |
A method and apparatus for circulating fluid in a wellbore includes a bottom sub having a bottom sub port and a mandrel, wherein the mandrel substantially forms an inner bore of the circulating tool and includes a mandrel port. The circulating tool may also include an activation piston that is movable in a first direction and a port piston movable in a second direction when the activation piston moves in the first direction. The circulating tool may further include an inner sleeve coupled to the port piston and movable with the port piston, the inner sleeve having an inner sleeve port in selective communication with the mandrel port. When the inner sleeve port is in communication with the mandrel port at least partially, circulating fluid is allowed to flow through the bottom sub port to the wellbore. |
