Reservoir Souring: Mechanisms and Prevention

Thermal effects on microbial composition and microbiologically induced corrosion and mineral precipitation affecting operation of a geothermal plant in a deep saline aquifer

“…However, the effects of temperature decreases in marine oil reservoirs caused by the introduction of sulfate-rich sea-water have been studied in detail. Several studies showed that the injection of sea-water in oil production systems altered the physical and chemical conditions in the reservoir, and favored the growth of mesophilic sea water bacteria, particularly SRB, near the injection well (Sunde and Torsvik 2005;Vance and Thrasher 2005). Subsequently, the activity of SRB caused severe economic problems due to the produced H 2 S, leading to microbiologically influenced corrosion, reservoir souring, and decreasing efficiency of oil production due to plugging by SRB biomass and precipitated metal sulfides.…”

Vi Khuẩn Khử Sunphat Ưa Ấm Sử Dụng Dầu Thô Desulfovibrio Desulfuricans Đh3p Phân Lập Từ Giếng Khoan Dầu Khí Mỏ Đại Hùng, Vũng Tàu

“…Tuy nhiên, sự sinh trưởng của chúng ñã làm chua hóa quá trình hình thành dầu mỏ do chúng ñã sản sinh ra khí H 2 S làm tăng lượng khí này lên trong các giếng dầu. ðồng thời chúng còn tham gia vào quá trình ăn mòn sinh học các thiết bị kim loại (Cord-Ruwisch et al, 1987;Vance, Thrasher, 2005). ðiều này ñã làm ảnh hưởng nghiêm trọng ñến các vấn ñề về kinh tế, sức khỏe, an toàn và kỹ thuật ñối với khai thác dầu khí.…”

Microbial community structures of an offshore and near-shore oil production facilities after biocide treatment and the potential to induce souring and corrosion

“…Among the six samples that were analysed, we found the highest SRB counts (10 6 cell/ml) and activities in sample 1N1 which was collected from the waste water of skimmer pit where all the liquid wastes from Escravos facility drains into there/it after washing and high temperature flushing of the facility. The physicochemical analysis indicated very low sulphate concentration in the skimmer pit (0.04 mM) suggesting that high SRB population may have depleted the available sulphate with possible generation of hydrogen sulphide which can result to souring (Vance and Trasher, 2005 Escravos which is represented in sample 1N3, we also observed high SRB counts (10 5 cell/ml) and activity and most microorganisms that were found to be predominant in skimmer pit samples were also found to be predominant in samples collected from produced water discharge area. Some examples include Acetotrophic methanogen, Methanosaeta and Methylotrophic methanogen, Methanolobus.…”