Setting tool for a hydraulically actuated downhole tool.

摘要

A setting tool allows setting a hydraulic liner hanger 52 in a deviated wellbore. Subsequent to setting the liner hanger through pressure developed within the setting tool, the setting tool is re-configured to allow full-bore passage therethrough. In the preferred embodiment, the flow communication to the liner hanger through port 122 is interrupted after it is set so that the setting tool can have a full-bore 50 clearance for passage of cement wipers or other devices and that pressure can then be applied in the setting tool to complete the cementing operations for the liner, as well as to actuate any casing or isolation packers. The bore 50 through setting tool is initially closed by drop ball 176 landing on trip ball 138, applied pressure then passing through port 122 to set the liner hanger. Pressure is then increased to shift trip ball 138 downwardly, causing it to rotate to a position in which the bore 50 is unobstructed. This movement also shifts a sleeve to close off port 122 so that pressure can subsequently be applied to perform other operations e.g. actuating casing packers.