Apparatus and Method for Controlling Multiple Downhole Devices

摘要

A downhole tool for use in a wellbore and that is attached to a perforating string that creates perforations in a portion of the wellbore. Where the downhole tool can selectively flow fluid from the perforating string to surface, or circulate flow from surface to an annular space between the tool and a wellbore wall. The tool includes pressure actuated valves that provide the flow diverting functionality. The valves are in cooperation with one another to prevent fluid from the portion of the wellbore having the perforations from flowing into the annular space. A pressure actuated selector assembly, which is made up of a piston and specially configured mandrels that are coaxially stacked, selectively moves separate mandrels in an axial direction for opening and closing the valves.

主权项

1. A downhole tool for use in a wellbore comprising:
a housing; a packer on an outer surface of the housing that selectively extends radially outward into sealing contact with a wall of the wellbore to define a formation space below the packer and an annulus space above the packer; an annulus valve mandrel in the housing; an annulus valve coupled to the annulus valve mandrel and in an open configuration when the annulus valve mandrel is moved to an opened position and in a closed configuration when the annulus valve mandrel is moved to a closed position; a formation valve mandrel in the housing; a formation valve coupled to the formation valve mandrel and in an open configuration when the formation valve mandrel is moved to an opened position and in a closed configuration when the formation valve mandrel is moved to a closed position; a piston axially moveable to different positions in the housing in response to a pressure ambient to an outer surface of the housing; a shifter assembly in the housing that is rotatable and axially moveable with movement of the piston, and selectively and exclusively coupled with one of the formation valve mandrel or the annulus valve mandrel to selectively and exclusively open one of the formation valve or the annulus valve.