Sulfide Production and Microbial Dynamics in the Water Reinjection System from an Offshore Oil-Producing Platform.

ABSTRACT: In addition to seawater in the injection header (IH) to enhance oil recovery, oil companies reuse produced water (PW), a byproduct of oil extraction, and implement produced water reinjection systems (PWRI). Although the microorganisms in IH are controlled by biocides, PW is generally treated by flotation to remove oil residues before PWRI. However, IH, PW, and PWRI can be sources of sulfate-reducing bacteria (SRB) related to oil reservoir souring. Here, we evaluated hydrogen sulfide (H₂S) production in IH, PW, and PWRI, as well as the microbial dynamics (most probable number-MPN, quantitative PCR, and amplicon sequencing), of a Brazilian oil reservoir. Results revealed that the highest average H₂S concentration occurred in PW samples. However, the dissolved H₂

SUBMITTER: Domingues VDSP 

PROVIDER: S-EPMC12843894 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature