When nitrate treatment wins the battle against microbial reservoir souring but loses the war

The injection of seawater into a hydrocarbon reservoir (seawater flooding), as an oil recovery method, triggers microbial souring, through which microorganisms consume sulfate ions and produce hydrogen sulfide, is hazardous, corrosive, detrimental to the environment if enters production wells. A strategy mitigate this problem add nitrate or nitrite seawater, also known treatment. This study investigates treatment in simulated real-world sector scale Danish North Sea non-isothermal multi-phase multi-component bio-chemical model field observations. common expectation that higher concentration less sulfide production. However, results show slowing down (or mitigation treatment) may cause from Put differently, not only total amount generated inside matters, but location generation zone its distance wells matter. Therefore, it possible insufficient amounts move toward Hence, more produced during lifetime reservoir. Moreover, considering laboratory measurements, presence coupled multi-physics processes, growth rates at are significantly lower than those observed experiments, under in-situ conditions, utilizing actual fluid samples.