Definition - What does Gas Lift mean?
A Gas Lift is an artificial lift method that uses an external high-pressure gas source to supplement the formation gas for raising well fluids by introducing bubbles of water vapor, compressed air or some other vaporous bubbles into the outlet tube of the well. The method reduces the hydrostatic pressure present at the outlet tube of the well rather than the hydrostatic pressure present at the inlet tube of the well. The compressed air is introduced in the well through various entry points known as gas lift valves. When the gas enters the well, bubbles are formed that lighten the fluids, lower the pressure and increase the rate of production of the well.
Petropedia explains Gas Lift
A Gas Lift is suitable for lifting the fluids present in a well. It is a method in which gas is infused into the well to reduce hydrostatic pressure of the fluids and help the reservoir fluids to enter into the wellbore with a higher flow rate. The gas being injected is generally transmitted down the casing-tubing annulus which enters the production train via numerous gas valves. The gas lift valves are simple devices with few movable parts and they are useful as the sand burdened fluids do not pass through these valves. The scarcity of space for the compressors on the platforms due to the well spacing can limit the application of the Gas Lift. The poor maintenance of compressors increases the compressor downtime and cost of the Gas Lift notably with the small field units. The compressors are very expensive and require proper maintenance.