A stage tool for cementing casing in a wellbore annulus, the tool comprising: a housing to be disposed on the casing and having a first internal bore and an exit port, the exit port communicating the first internal bore with the wellbore annulus; a first breachable obstruction disposed on the tool and preventing fluid communication through the exit port, the first breachable obstruction being exposed to the first internal bore between ends of a closing sleeve and an intermediate sleeve, the first breachable obstruction being breached in response to a first fluid pressure component in the first internal bore acting against the breachable obstruction and permitting fluid communication through the exit port when breached; wherein the closing sleeve is an internal sleeve movably disposed in the first internal bore of the housing and having a second internal bore, and the closing sleeve movably disposed on the tool at least from an initial position to a closed position relative to the exit port, the closing sleeve in the initial position leaving the first breachable obstruction exposed to the first internal bore and protecting an upper sealing area defined on the first internal bore, the closing sleeve moving from the initial position to the closed position at least in part in response to a second fluid pressure component, the closing sleeve in the closed position covering the exit port and preventing fluid communication through the exit port; and the intermediate sleeve disposed in the first internal bore and being moveable in the first internal bore at least from a first position to a second position, the intermediate sleeve in the first position at least partially covering a lower sealing area defined on the first internal bore, the intermediate sleeve in the second position being moved away from the lower sealing area, thereby allowing the closing sleeve to seal with the upper and lower sealing areas (113a, 113b). a housing to be disposed on the casing and having a first internal bore and an exit port, the exit port communicating the first internal bore with the wellbore annulus; a first breachable obstruction disposed on the tool and preventing fluid communication through the exit port, the first breachable obstruction being exposed to the first internal bore between ends of a closing sleeve and an intermediate sleeve, the first breachable obstruction being breached in response to a first fluid pressure component in the first internal bore acting against the breachable obstruction and permitting fluid communication through the exit port when breached; wherein the closing sleeve is an internal sleeve movably disposed in the first internal bore of the housing and having a second internal bore, and the closing sleeve movably disposed on the tool at least from an initial position to a closed position relative to the exit port, the closing sleeve in the initial position leaving the first breachable obstruction exposed to the first internal bore and protecting an upper sealing area defined on the first internal bore, the closing sleeve moving from the initial position to the closed position at least in part in response to a second fluid pressure component, the closing sleeve in the closed position covering the exit port and preventing fluid communication through the exit port; and the intermediate sleeve disposed in the first internal bore and being moveable in the first internal bore at least from a first position to a second position, the intermediate sleeve in the first position at least partially covering a lower sealing area defined on the first internal bore, the intermediate sleeve in the second position being moved away from the lower sealing area, thereby allowing the closing sleeve to seal with the upper and lower sealing areas (113a, 113b).