Fixed type spring gas lift valve

Abstract

The invention relates to a fixed type spring gas lift valve. The fixed type spring gas lift valve comprises a shell assembly, a valve element and a disc spring, wherein the shell assembly comprises a tube body provided with an inner cavity, an upper connector arranged at the upper end of the tube body, and a lower connector arranged at the lower end of the tube body; the lower connector is provided with an outflow channel and an inflow through hole extending in the radial direction; the valve element and the disc spring are arranged in the inner cavity and located between the upper connector and the lower connector; the disc spring is arranged between the valve element and the upper connector and used for pushing the valve element to the position cutting off connection between the outflow channel and the inflow through hole; and when fluid entering the valve through the inflow through hole compels the valve element to compress the disc spring, the valve element is moved from the position cutting off connection between the outflow channel and the inflow through hole to the position allowing the outflow channel and the inflow through hole to be mutually connected. The fixed type spring gas lift valve provided by the invention adopts the disc spring with higher strength, and thus the fixed type spring gas lift valve can work in deep wells 4000 meters below with higher pressure.

Description

technical field [0001] The invention belongs to the field of oil exploitation devices, in particular to a fixed spring gas lift valve. Background technique [0002] Air pressure lift is the most economical oil recovery method in the modern oil production process. Gas lift can not be limited by the depth of the oil well. The injected gas can go deep into the liquid through the gas lift valves at all levels from top to bottom, so that the oil above the bottom of the oil pipe The weight of the liquid becomes lighter and the back pressure on the reservoir is reduced, thus ensuring the smooth and continuous production of the oil well. Lower the liquid level in the well to the depth of the gas injection point with a lower start-up gas injection pressure, and produce at the expected output with the gas injection pressure required for normal work at this depth. [0003] The existing gas lift valve adopts the bellows structure. Because the wall of the bellows is thin and the pressur...

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Problems solved by technology

[0003] The existing gas lift valve adopts the bellows structure. Because the wall of the bellows is thin and the pressure bearing capacity is limited, the working environment of the existing gas lift valve is limited by the pressure of the deep well, and it cannot work in the deep well with high pressure.

When the casing pressure in the well itself is greater than the pressure in the bellows envelope, the gas lift valve has not yet worked, and the ball valve is in an open state, which cannot realize the reverse mud replacement, and cannot replenish the annular protection fluid after gas lift

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