2.
n. [Enhanced Oil Recovery]
In
matrix treatments, a chemical added to
acid that adsorbs on the pipe surface to form a protective film. This decreases the destructive reaction of acid with metals. The
inhibitor does not completely stop the
corrosion reaction, but it eliminates more than 99% of the metal losses that would occur if the inhibitor were not present. The inhibitor has little or no effect on the reaction rate of acid with
limestone,
dolomite or acid-soluble minerals.
Specific corrosion inhibitors are environmentally compatible, effective in
hydrogen sulfide [H
2S] environments, effective on high chrome steel, and effective on special steel alloys, such as
coiled tubing. These inhibitors may be used at temperatures approaching 500
oF [260
oC].