Downhole tool system comprising hydraulically actuated shifting assembly and related methods

A downhole tool system for use within a casing string including a sleeve valve comprising a shiftable inner sleeve, the downhole tool system comprising:

• a locator tool comprising at least one sleeve engagement member that is hydraulically actuatable from a radially retracted configuration to a radially extended configuration for engaging the shiftable inner sleeve;
• an anchor tool positioned downhole of the locator tool and comprising at least one anchor member that is hydraulically actuatable from a radially retracted configuration to a radially extended configuration for gripping an inner wall of the casing string;
• and
• a shifting tool positioned between the locating tool and the anchor tool and movable between an axially extended configuration and an axially contracted configuration, wherein the shifting tool is hydraulically actuatable to move from the axially extended configuration to the axially contracted configuration;
• wherein the downhole tool system is connectable to tubing uphole of the locator tool and defines a primary inner fluid passageway therethrough, and each of the locator tool, the anchor tool, and the shifting tool are hydraulically actuatable by controlling fluid pressure or fluid flow within the primary inner fluid passageway;
• and
• wherein the locator tool is actuatable by the fluid pressure in the primary fluid passageway exceeding a first pressure threshold, the anchor tool is actuatable by the fluid pressure exceeding a second pressure threshold that is greater than the first fluid threshold, and the shifting tool is actuatable by the fluid pressure exceeding a third pressure threshold that is greater than the second pressure threshold.