STAGE TOOL WITH LOWER TUBING ISOLATION

摘要

A stage tool includes an isolation mechanism for isolating the lower bore of a completion string. The isolation mechanism is initially in a deactivated configuration until sufficient hydraulic pressure is applied, at which time, the isolating mechanism is activated to isolate the lower bore from cement ingress. Concurrently or subsequently, a stage tool may be opened to facilitate cementing of an annulus between the completion string and the wellbore. After cementing, the isolation mechanism, or portions thereof, may be drilled out to re-establish flow through the stage tool.

主权项

1. A stage tool, comprising:
a tubular body having one or more ports formed through a sidewall thereof; and an isolation mechanism disposed in the tubular body, the isolation mechanism having:
a window sub;a flapper mount coupled to the window sub;a flapper coupled to the flapper mount, the flapper pivotable between an open position and a closed position;an opening sleeve axially movable from a first position that closes the one or more ports to a second position that exposes the one or more ports; anda closing sleeve axially movable from a first position that exposes the one or more ports to a second position that closes the one or more ports.