Inhibitor treatment program for chlorine dioxide corrosion

Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Maintaining environment nondestructive to metal

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252 8555, 25238923, 25238953, 25240023, 25240053, 422 15, 422 17, 422 18, C23F 1104

Patent

active

050646125

ABSTRACT:
A composition and methods for use in oilfield waterflood systems are disclosed. The composition is comprised of a phosphonate, a copolymer, and a permanganate and is effective at inhibiting the corrosion of metallic systems in petroleum oilfields caused by chlorine dioxide. Methods of use of phosphonate and permanganate alone are also disclosed. Chlorine dioxide is used in oilfield waterflood systems to control sulfides and sulfate reducing bacteria. However, chlorine dioxide is highly corrovive to the metallic components in the processing equipment of an oilfield system. The most effective system currently used to inhibit corrosion caused by chlorine dioxide comprises chromates. However, chromates are highly toxic and their use throughout the country is becoming increasingly restricted.
The use of a composition comprised of 1-hydroxyethylidene diphosphonic acid, a compolymer comprised of acrylic acid/allyl hydroxy propyl sulfonate ether and potassium permanganate has proved to be more effective than chromates as a chlorine dioxide corrosion inhibitor without the serious toxicological effects caused by the use of chromates.

REFERENCES:
patent: 4077879 (1978-03-01), Smeck
patent: 4552665 (1985-11-01), Ralston et al.
patent: 4640818 (1987-02-01), Grierson et al.
patent: 4717499 (1988-01-01), Chen
Prues et al., "Chemical Mitigation of Corrosion by Chlorine Dioxide in Oil Field Water Floods", Materials Reference, May 1985.

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