Gas lift
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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