Patent ID: 9664008
Date: 2017-05-30
CPC Classifications: E21B

Claim:
1. A downhole tool, comprising: a housing at least partially defining a flowbore therethrough and a plurality of fluid apertures; an inner annular casing disposed in the housing and defining in conjunction with the housing an annular space, the inner annular casing defining a casing flowpath and a first port configured to fluidly couple the flowbore and the casing flowpath; an annular cover disposed in the annular space and configured to be displaced by a first piston at a first pressure applied to the flowbore and a biasing member at a second pressure applied to the flowbore; an annular component being disposed in the annular space, the annular component and the annular cover defining a fluid passageway therebetween; and a second piston at least partially disposed in the annular space and configured to be displaced by a force provided by a third pressure applied to the annular space via the flowbore, such that the plurality of fluid apertures and the flowbore are fluidly coupled, wherein the downhole tool is configured such that at the second pressure applied to the flowbore, the biasing member is extended, such that the annular cover is displaced and the fluid passageway fluidly couples the annular space and the flowbore via the first port and the casing flowpath.