Patent ID: 6851481
Filing Date: 2005-02-08
Classification: E21B

Abstract:
1. A method of operating a downhole device in a petroleum well having a borehole and a piping structure positioned within the borehole, comprising the steps of: delivering a time varying current along the piping structure to a downhole location; pressurizing a hydraulic fluid using the time varying current at the downhole location; operating the downhole device using the pressurized hydraulic fluid; operating a motor at the downhole location; driving a pump with said motor to pressurize the hydraulic fluid; providing an actuator operably connected to the downhole device and hydraulically connected to the pump selectively driving the actuator with the pressurized hydraulic fluid such that the downhole device is actuated providing a pilot valve hydraulically connected between the pump and the actuator; and adjusting the pilot valve to selectively drive the actuator.