| 摘要 |
The present invention provides a tool for use in wellbores. The tool is operated by the wellbore hydrostatic pressure. The tool includes one or more devices that operate when a mechanical force is applied to such devices. The tool includes at least one atmospheric chamber. A setting member disposed in the tool is utilized to provide the mechanical force in response to the application of the hydrostatic pressure thereto. Prior to activating the tool, the setting member is locked or restrained in an inoperative position. To operate the device, the tool is placed at a suitable location in the wellbore. The atmospheric chamber is charged with the wellbore fluid, which releases the setting member from its restrained or locked position, subjecting the setting member to the wellbore hydrostatic pressure, thereby providing the mechanical force to operate at least one of the devices. A second atmospheric chamber may be provided that remains at the atmospheric pressure, but cooperates with the first chamber as it is charged with the wellbore fluid to operate a second setting member, which operates a second device. A sensor associated with the tool detects signals transmitted to the tool from a remote location. A control circuit in the tool receives the detected signals from the sensor and in response thereto operates an electrically-operated flow control device, thereby charging the chamber with the wellbore fluid. |
