Souring and Microbial-influenced Corrosion in Produced Water Re-injection Systems


Figure 3: Redox Potential Profiles in Biofilms from Test Systems to which Nitrate was Added from Week 1 (Tests 1, 2 and 4) and from Week 14 (Tests 5 and 6)


-2500


Nitrate from week 1


-2000 6 -1500 5 -1000 -500 0 -600 Test 1 -400 -200 Test 2 0 200 400 Test 4 600 -600 Redox potential (mV) Test 5 Test 6 -400 -200 0 200 400 600


4 nitrate control


2


no nitrate control


1


Nitrate from week 14


The position of the metal surface and the approximate biofilm–water interface are indicated by zero depth and by black horizontal lines, respectively.


Depth (µm)


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