Actuator module to operate a downhole tool

摘要

A downhole actuator module 300 is separate from the tool 25 to be actuated and responds to encoded commands that are detected and interpreted by a sensor in the module. Preferably the module is releasably connected to the tool string 28 and controls the communication of fluid pressure to the inlet port of the tool. Cartridges of explosive or gas generating chemicals may be activated to move an operator mandrel of the tool, or a spear may break a rupture disc to expose the tool to annulus or tubing pressure. Multiple actuators may be present in the module to operate a single tool in different ways. Also disclosed is an arrangement in which the module is releasably connected to the tool and may be retrofitted to conventional tools. A backup mechanical control is provided in case of actuator or communication failure.