Electric surface controlled subsurface valve system

摘要

A solenoid operated valve system for petroleum production wells including a solenoid operated valve securable in a well bore connected in electrically insulated relation with the lower end of a tubing string extending to the surface and a tubing string below the valve to a well packer and an electric circuit from a control system at the surface through the tubing string to the valve and back to the surface in the casing the tubing and casing serving as the electrical conductors for opening the valve and monitoring the valve position. The solenoid operated valve has an operator tube formed of tubular sections of different magnetic characteristics so that the valve is opened against a biasing spring by a high current flow and held open by a current flow of a lower value. The valve solenoid is operable by either AC or DC current.