Gas lif t

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This secondary recovery process utilises the buoyancy of high-pressure to
physically lift oil from the depths of the well. Gas is injected into the annulus
between the casing and the tubing.
The gas travels down the annulus until it reaches the packer which acts as a seal
between the oil producing formation, the casing and the tubing to prevent gas
from entering the producing zone. The packer forces the gas through the gas lift
valve into a column of oil. The high pressure gas rises up thought the tubing in
solution with the oil towards the surface.
Gas lift requires a head of pressure in excess of the bottom hole well pressure
and therefore is an application ideally served by barrel compressors

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