The invention discloses a
carbon dioxide corrosion inhibitor which consists of the following components in percentage by
mass: 70-80% of clear water, 4-6% of dodecyl dimethyl benzyl
ammonium chloride, 8-12% of imidazoline, 4-6% of
alkyne-oxy
methylamine and 4-6% of dodecyl trimethyl
ammonium chloride. The preparation comprises the following steps: weighing the components according to the
mass proportion and placing separately for later use; adding 70-80% of the clear water by
mass into a mixer and starting stirring for 3-5min; adding the dodecyl dimethyl benzyl
ammonium chloride into the mixer and starting stirring for 12-18min; adding the dodecyl trimethyl
ammonium chloride into the mixer and starting stirring for 12-18min; adding the imidazoline into the mixer and starting stirring for 12-18min; and adding the
alkyne-oxy
methylamine into the mixer and the rest clear water, and starting stirring for at least 20min until the
drug is uniformly mixed before stopping the stirring. The
carbon dioxide corrosion inhibitor disclosed by the invention realizes a good
corrosion inhibition effect on the
sewage with high content of
carbon dioxide in an oilfield, can effectively control the corrosion of
sewage at low concentration and effectively saves the
drug cost as well as the repair and maintenance cost of the oilfield
water treatment equipment; and moreover, the preparation method is simple and fast, the production cost is low and the efficiency is high.