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51314-3755-Changes in Water Chemistry at Dead Ends Resulting from Bacteria Development

Product Number: 51314-3755-SG
ISBN: 3755 2014 CP
Author: Yves Gunaltun
Publication Date: 2014
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Severe bacteria corroison was observed at dead ends in an oil field producing formation water with TDS higher than 250 g/l and  pH around 6 - 6.5. SRB and TRB activities are supposed to be very low in such salty environment.  Four water samples of 3 -4 cm3 each collected from the same dead end showed that the salinity of the stagnant water is one order of magnitude less (about 15 - 20 g/l) and the pH is as low as 4.5. More samples were collected and the changes of salinity and pH were confirmed. It was clear that production of acids /water by some bacteria created ideal conditions for SRB/ TRB development. In order to understand the mechanism and identify involved bacteria several  water samples were collected from dead ends and sent to a well know laboraotry for identification of differente species. In the mean time the emchanisms of dead end corrosion were investigated.       
Severe bacteria corroison was observed at dead ends in an oil field producing formation water with TDS higher than 250 g/l and  pH around 6 - 6.5. SRB and TRB activities are supposed to be very low in such salty environment.  Four water samples of 3 -4 cm3 each collected from the same dead end showed that the salinity of the stagnant water is one order of magnitude less (about 15 - 20 g/l) and the pH is as low as 4.5. More samples were collected and the changes of salinity and pH were confirmed. It was clear that production of acids /water by some bacteria created ideal conditions for SRB/ TRB development. In order to understand the mechanism and identify involved bacteria several  water samples were collected from dead ends and sent to a well know laboraotry for identification of differente species. In the mean time the emchanisms of dead end corrosion were investigated.       
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