Intermittent Gas Injection

Published: June 19, 2019 | Last updated: July 5, 2023

What Does Intermittent Gas Injection Mean?

Intermittent gas injection is a gas-lift pumping method in which gas is delivered to the well for a short period of time known an 'on time' followed by an 'off time' during which no gas is delivered. Intermittent gas injection helps in the gas production process and is installed in wells with low bottom hole pressure. Gas is injected through choke in surface and then gas into tubing. In the tubing, the gas forms three areas namely, gas column area, film area and slug area.

During gas lift operations, the oil production rate increases as gas injection rate increases. As the injection rate of gas increases, the producing oil well will experience a decrease in gravitational pressure drop while experiencing an increase in frictional pressure drop.


Trenchlesspedia Explains Intermittent Gas Injection

Intermittent gas injection gas lift equipment consists of compressor, choke and vale in mandrel. The compressor imparts high pressure to the gas which is injected in choke by which the casing pressure increases and opens the gas lift valve. The gas enters the tubing through the valve propelling the liquid slug to the surface. Intermittent gas lift increases bottom hole pressure and propels liquid to the surface.

Gas lift is a method that is reliable and simple and does not require the use of a downhole pump. Compressed air is injected into the lower section of the tubing to enhance the productivity of the well by mixing with the liquid column and reducing its density and viscosity, making it easier for the fluid to reach the surface.


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