Patent ID: 7318478

Claim:
A circulation tool for use downhole in a well, the circulation tool suspended in the well from the tubular string, the circulation tool comprising: a tubular housing having a central axis and including one or more bypass ports for circulation between a bore in the housing and an annulus surrounding the housing; a sleeve axially movable within the housing between an open position and a closed position; seals spaced above and below the one or more bypass ports for sealing between the sleeve and the housing when the sleeve is in the closed position; and a ball having a small diameter flow port therein and a seat surrounding the small diameter flow port for seating engagement with a plug, the plug engaging the seat to increase fluid pressure to move the sleeve to the closed position such that the seals seal between the sleeve and the housing above and below the bypass ports and to axially move the sleeve and rotate the ball to an open position, the ball in the open position having a large diameter through port with an axis generally aligned with the axis of the tubular housing.