Materials Performance

JUN 2019

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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Page 15 of 80

13 MATERIALS PERFORMANCE: VOL. 58, NO. 6 JUNE 2019 Information on corrosion control and prevention Continued on page 14 A heat map generated from a bacteria survey of an offshore oil platform before optimization of a biocide program (top) and after optimization of a biocide program. Green indicates low levels of bacteria, yellow shows medium levels of bacteria, and red signifies high levels of bacteria. Images courtesy of Schlumberger. bacteria monitoring methods need to be accurate under a wide range of operating conditions. Oilf ield waters vary greatly in chemical composition and biological activity. The salinity of produced waters can vary from 0.1 to 35% and contain a variety of production chemicals including corrosion inhibitors, scale inhibitors, methanol, and biocides. The water can contain several different ty pes of bacteria and archaea, and in most cases, all need to be measured. To get an accurate mea- surement of bacteria levels, the samples need to be preserved to prevent changes in the bacteria concentrations. To measure bacteria populations in oilf ield waters in real time, they say, a quick test method is required. Ideally, bacteria analysis is performed in the f ield. However, several of the bacteria measure- ment methods used in oil and gas produc- tion can take up to one month to get results. Because standard bacteria tests used in oil and gas applications were not developed for oilf ield use, a new bacteria monitoring method was needed that detects all living bacteria and archaea

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