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Annulus Safety Valve (ASV)
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The ASV is mainly installed in gas lift wells, and preferably at a shallow depht to minimize the amount volume of gas above the ASV.
It have also been used at TLP oil rigs.

Annulus Safety Valve (ASV) is a gas flow barrier in annulus.
Annulus Safety Valve consists of a packer with an opening (Micro annulus). The valve is surface operated, It is a “fail-safe close” device for annular flow.

For more detailed information and history of the ASV click here:
http://www.ptil.no/news/audit-use-of-safety-valves-in-the-annulus-article1757-79.html

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