Patent ID: 8397820
Filing Date: 2013-03-19
Classification: E21B

Abstract:
1. The wellbore fluid treatment assembly comprising: a tubing string including an inner bore and a tubular housing with a wall, an outer wall surface and an inner wall surface defining the inner bore through the tubular housing, the tubing string further including an uphole drift diameter uphole of the tubular housing; a port through the wall of the tubular housing, the port providing access between the outer wall surface and the inner wall surface through the port; a sliding sleeve installed in the tubular housing inner bore and slidable between (i) a closed-port position covering the port, wherein fluid cannot pass through the port, and (ii) an open-port position exposing the port to the inner bore and wherein fluid cannot pass through the port, the sliding sleeve including an outer diameter, an inner diameter defining an axial bore and a constriction along the inner diameter forming a seat; and further comprising an inwardly protruding shoulder in the inner bore downhole of the sliding sleeve against which the sliding sleeve is abutter in the open-port position; wherein the sliding sleeve is retrievable, with the outer diameter sized less than the uphole drift diameter such that the sliding sleeve can be removed from the tubular housing and axially moved up though the inner bore.