WELL GAS LIFT Russian patent published in 1994 - IPC

FIELD: gas and oil producing industry. SUBSTANCE: gas lift has lift. Installed successively on lift from the bottom upwards are check valve, packer, circulating baffle valve, working valve and starting valves. The latter consist of body with inlet longitudinal slots and outlet channels, charging unit and seals located in body upper part, flexible member which form together with body an airtight chamber of compressed gas, and rod with channels. Rod is connected with its upper part to flexible member, and with its lower end, to gate with channels. Starting valve is provided with magnets and seating surfaces for them. Magnets are located in upper side part of rod above its channels and magnet seating surfaces on inner surface of body of starting channel. Magnets are arranged for interaction with seating surfaces during closing and opening of gate. EFFECT: higher reliability of gas lift due to reduced number of starting valves during starting and improved reliability of their closing in course of well operation. 3 dwg