Double bellows gas lift valve "faustoval"
OwnerJean Louis Faustinelliinventor
Life of this patent
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Abstract
The phase of this process is done by the functionality of the perforated lower stem, which due to the fact that its internal conduit is able to connect the lower bellow in an alternated way, first to the tubing and after, to the casing. This is possible due to the fact that it is assisted by: a) a window that communicates the casing with the tubing when the lower bellow is open, and b) sealing packing installed in the lower stem to isolate the casing pressure, in order that the lower bellow can register only the tubing pressure when it is in closing position.
Claims3
A recoverable gas lift valve to be seated in a gas lift pocket mandrel in an oil well comprising:
- an upper bellow having a stem operatively engaging a first seat and the upper bellow having a first pressure;
- and
- a lower bellow having a perforated lower stem operatively engaging a second seat and the lower bellow having a second pressure which is different than the first pressure of the upper bellow.
The phase of this process is composed by the functionality of the lower bellow, which takes charge of the gas passage from the casing to the tubing, and it is able to react in two different ways such as:
- a) with the bellow closed, it reacts to the liquid pressure of the tubing, and b) with the bellows open, it reacts to the gas pressure of the casing.
The phase of this process is done by the functionality of the lower bellow which can open only when the upper bellow is open, and close when the casing pressure is lower than the pressure set of the lower bellow, wherein both bellows are calibrated at different levels of pressures, and control independently the opening and closing pressure of the gas in the casing, whereby the differential of casing pressure permit to take intermittently a high volume of gas from the casing, even though the casing is continuously receiving gas injection from the surface choke.
Dependencies are inferred from the claim text.