The detrimental role of sulphate reducing bacteria (SRB) and their generation of the highly corrosive hydrogen sulphide gas is well established. There is evidence of the presence of carbonate generating bacteria (CGB) in association with SRB in the water injection system of Umm Shaif field offshore Abu Dhabi.

These bacteria tend to produce solid calcium, magnesium and iron carbonates which constitute a significant amount of debris forming part of the protective media for SRB growth and plug the formation if it is dislodged from the pipe wall and transported to the injectors.

The evidence for CGB existence together with other bacterial activity is obtained from chemical analysis, X-ray diffractogram, microprobe analysis and scanning electron microscope examination.

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