Patent ID: 9650868
Date: 2017-05-16
CPC Classifications: E21B

Claim:
1. A stage tool for wellbore annular cementing, comprising: a main body including a tubular wall with an outer surface and a longitudinal bore extending from a top end to a bottom end; a cementing port through the tubular wall, the cementing port when opened, providing fluidic access between the longitudinal bore and the outer surface; a cementing port closure configurable between (i) a first, port closed position sealing against fluid flow out of the stage tool through the cementing port, (ii) an open position permitting flow through the cementing port and (iii) a locked, port closed position sealed against fluid flow out of the stage tool through the cementing port; a first lock to lock the cementing port closure in the locked, port closed position; and a secondary closing sleeve moveable between a retracted position and a position covering the cementing port; and a second lock to lock the secondary closing sleeve in the position covering the cementing port.