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AbstractThe use of coiled tubing (CT) has strongly increased in the oil and gas industry in recent years. Potential corrosion problems arise from re-use of low quality water in closed loop coiled tubing operations. Water chemistry, corrosion rates, microbial counts and microbial community compositions were monitored for 5 samples from Field 1 and for 15 samples from Field 2 (Canada). The samples from Field 1 represented a failure with general corrosion rates of 0.1 mm/yr. The general corrosion rates of Field 2 samples for incubations initiated in the lab ranged from 0.09 to 1.31 mm/yr (average 0.25 mm/yr). The high rate of 1.31 mm/yr was for a recycled injection water (S19) taken from a tank prior to re-injection. Interestingly, general corrosion rates for this recycled injection water (S19) for incubations initiated onsite were also very high (0.89, 0.84 and 0.99 mm/yr). Acid Producing Bacteria (APB) like Pseudomonas and Iron Reducing Bacteria (IRB) like Shewanella were found in all samples. These may have created acidic environments accelerating the corrosion. Sand (7-8 g/L) and other components found in Field 2 samples may have contributed to sand erosion-corrosion. In summary, it appeared that low pH, sand and microbes can significantly increase CT corrosion.

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