Acid based corrosion occurs
with the presence of naturally occurring acids such as Carbon Dioxide
(CO2) and Hydrogen Sulphide (H2S) to name a few.
The main method of treating
this type of corrosion is by a corrosion inhibitor. The injected
corrosion inhibitor must be in physical contact with the area that
This becomes complicated
when certain well configurations have one-way valves, and packers.
Injection can be facilitated by weighted inhibitors, and capillary strings
to name a few.
Common injection methods
are: Batching, continuous, and pigging. These methods can be used
in conjunction with one another depending on individual circumstances.