Reclosable multi-zone isolation using a pull-force lock mechanism

An apparatus for isolating a first zone from a second zone in a subterranean wellbore, the apparatus comprising:

• an outer tubular;
• an inner tubular positioned within the outer tubular, thereby forming an annular flow path there between that is in fluid communication with the first zone, wherein the inner tubular defines a central flow path therein that is in fluid communication with the second zone;
• a sleeve positioned in the annular flow path to control fluid flow there through, the sleeve being axially moveable relative to the outer and inner tubular between a closed position and an open position;
• and
• a mandrel assembly slidingly positioned within the inner tubular and coupled to the sleeve, the mandrel assembly being operable to shift the sleeve between the open and closed position, the mandrel assembly comprising an upper mandrel component and a lower mandrel component slidingly engaging the upper mandrel component,
• wherein the lower mandrel component is operable to move the sleeve if a push force is applied to the lower mandrel component, but the mandrel assembly becomes locked out if a pull force is applied to the lower mandrel component, wherein the lower mandrel component comprises an extended portion having a lug thereon, the extended portion surrounding the upper mandrel component and operable to lock the mandrel assembly in response to the pull force applied to the lower mandrel component.

A method for isolating a first zone from a second zone in a subterranean wellbore, the method comprising:

• disposing a multi-zone isolation tool within the wellbore in a closed position, the tool having an inner tubular defining a central flow path and an outer tubular defining an annular flow path with the inner tubular, the annular flow path in fluid communication with the first zone, the central flow path in fluid communication with the second zone,
• wherein a mandrel assembly includes an upper mandrel component that slidingly engages a lower mandrel component;
• applying a push force to the upper or lower mandrel components;
• in response to the push force, shifting a sleeve coupled to the mandrel assembly between the closed position, whereby the annular flow path is blocked, to an open position whereby the annular flow path is opened;
• and
• locking out the mandrel assembly if a pull force is applied to the lower mandrel component, wherein locking out the mandrel assembly comprises:
• applying the pull force to the lower mandrel component;
• and
• causing a collet finger of the lower mandrel component to wedge between the upper mandrel component and the inner tubular.