A sulfur and nitrogen cycle informed model to simulate nitrate treatment of reservoir souring

Moein Jahanbani Veshareh*, Hamidreza M. Nick

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

196 Downloads (Pure)

Abstract

Nitrate treatment has been widely used in various seawater injection projects to treat biologic sulfate reduction or reservoir souring. To design a promising nitrate treatment plan, it is essential to have a comprehensive understanding of reactions that represent the microbial communities of the reservoir and mechanisms through which the souring process is inhibited. We employ a new approach of evaluating different reaction pathways to design reaction models that reflect governing microbial processes in a set of batch and flow experiments. Utilizing the designed models, we suggest dissimilatory nitrate reduction to ammonium is the main reaction pathway. Additionally, we illustrate nitrite inhibition is the major mechanism of nitrate treatment process; independent of nitrate reduction being autotrophic or heterotrophic. We introduce an inhibitory nitrate injection concentration that can inhibit souring regardless of nitrite inhibition effect and the distance between injection and production wells. Furthermore, we demonstrate that the ratio of the nitrite-nitrate reduction rate can be used to estimate nitrate treatment effectiveness. Our findings in regard to importance of nitrite inhibition mechanism and the inhibitory nitrate concentration are in accordance with the field observations.
Original languageEnglish
Article number7546
JournalScientific Reports
Volume9
Issue number1
Number of pages12
ISSN2045-2322
DOIs
Publication statusPublished - 2019

Fingerprint Dive into the research topics of 'A sulfur and nitrogen cycle informed model to simulate nitrate treatment of reservoir souring'. Together they form a unique fingerprint.

Cite this