Patent ID: 7322408
Filing Date: 2008-01-29
Classification: E21B

Abstract:
1. A downhole tool for use in a cased or lined well bore, the tool comprising: a body connectable in a work string, the body having a fluid flow path therethrough; a barrier comprising a resilient member, the barrier located at an outer surface of the tool; and a hydraulic actuator comprising a retainer and a piston member; wherein the barrier is actuable to control fluid flow past the tool and to selectively divert fluid flow through the flow path; and wherein the resilient member is initially held in compression by the retainer to allow fluid flow past the tool; and further wherein the barrier is actuated by the piston member which releases the retainer to cause the resilient member to deform by expanding so that the resilient member extends towards a wall of the well bore to divert fluid flow through the flow path.