Gas lift is a form of artificial lift where gas bubbles lift the oil from the well.

  Gas lift is used in the oil wells that have insufficient reservoir pressure to produce the well. In the petroleum industry, the process involves injecting gas through the tubing-casing annulus. Injected gas aerates the fluid to reduce its density; the formation pressure is then able to lift the oil column and forces the fluid out of the wellbore. Gas may be injected continuously or intermittently, depending on the producing characteristics of the well and the arrangement
of the gas-lift equipment.

  The amount of gas to be injected to maximize oil production varies based on well conditions and geometries.Too much or too little injected gas will result in less than maximum production. Generally, the optimal amount of injected 
gas is determined by well tests,where the rate of injection is varied and liquid production (oil and perhaps water) is measured.

  Although the gas is recovered from the oil at a later separation stage, the process requires energy to drive a compressor to raise the pressure of the gas to a level where it can be re-injected.

  Practically,the nitrogen gas is compressed for gas lift. The high pressure(50Mpa) nitrogen gas compressors are widely used at home and abroad.In China,our company is the lead for gas lift oil production field,we have supplied high pressure(50Mpa) nitrogen gas compressor to SINPEC,SNPC,and other Oil&Gas Field.