High pressure gas lift valve with dual edge welded bellows

A gas lift valve (GLV) capable of withstanding high differential pressure comprising:

• an edge welded bellows (EWB) containing a plurality of convolutions, wherein the bellows can contract and expand;
• a dome sub connected to bellows subassembly containing pressurized gas-nitrogen charge, telescoping stem housing connected to a lower bellow containing telescoping spring-loaded stem and a TC ball closing mechanism;
• an EWB subassembly consisting of an upper bellow and said lower bellow welded to mating parts containing sealed degassed silicone oil volume transfer between upper and lower bellow depending on dome and injection pressure;
• wherein a mechanism involving telescoping stem is spring loaded with the TC ball mechanism to open and close the injection gas passage through valve, wherein the upper and lower bellow is configured to fully compress to solid by design, wherein the mating parts to which the bellows are welded comprises a same convex and concave geometry as the upper and lower bellows, wherein fitting such that said gas lift valve is capable of withstanding compression pressures up to 30 KSI;
• a one-way check valve located at a GLV lower end prevents flow opposite to normal flow, and
• a fluid selected from the group consisting of an injection gas and a well fluid wherein the injection fluid is located in exterior of the lower bellow and provides an external pressure to the lower bellow, and wherein the bellows are selected to have the approximately same volumetric oil displacement for selected bellow travel, compression/expansion thereby the oil transferred from upper to lower bellow has approximately equal volume, wherein the GLV bellow assembly is filled with silicone oil degassed by centrifugal process where assembling fixture with said bellow assembly is rotated-centrifuged until gas is removed from oil, fully non-compressible fluid,
• a silicone oil used to fill the bellow subassembly and de-gassed using centrifugal force, and
• wherein the EWB of the GLV is fully compressed to solid at certain pressure, silicone oil is transferred to opposite bellow, any further pressure increase against compressed bellow will not be transmitted to expanded bellow and expanded bellow will be fully pressure balanced and thereby protected from over-pressurizing, thereby useful for well integrity (pressure) testing, by eliminating need for using dummy valve and saving at least one wireline job.