System and method for injecting fluid at selected locations along a wellbore

Systeme et composante pour injecter du fluide en des endroits selectionnes le long d'un puits de forage

Abstract

A system and method for selectively actuating sliding sleeves in valve sub- members which are placed downhole in a wellbore, via one or more darts inserted into said wellbore, to thereby open a ports or ports in such sub-members to allow fracking of the wellbore . The dart is preferably coupled, or provided with coupling means to permit coupling, to a retrieval tool , which upon the retrieval tool being so coupled allows a bypass valve to be opened to thereby assist in withdrawing the dart from within the valve sub-members. Upward movement of the retrieval tool allows a wedge-shaped member to disengage the dart member from a corresponding actuated sleeve to allow the dart to be withdrawn from the wellbore.

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