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Gao P, Fan K. Sulfur-oxidizing bacteria (SOB) and sulfate-reducing bacteria (SRB) in oil reservoir and biological control of SRB: a review. Arch Microbiol 2023; 205:162. [PMID: 37010699 DOI: 10.1007/s00203-023-03520-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 03/18/2023] [Accepted: 03/26/2023] [Indexed: 04/04/2023]
Abstract
Sulfur-oxidizing bacteria (SOB) and sulfate-reducing bacteria (SRB) inhabit oilfield production systems. Sulfur oxidation driven by SOB and dissimilatory sulfate reduction driven by SRB play important roles in sulfur cycle of oil reservoirs. More importantly, hydrogen sulfide produced by SRB is an acidic, flammable, and smelly toxic gas associated with reservoir souring, corrosion of oil-production facilities, and personnel safety. Effective control of SRB is urgently needed for the oil industry. This depends on an in-depth understanding of the microbial species that drive sulfur cycle and other related microorganisms in oil reservoir environments. Here, we identified SOB and SRB in produced brines of Qizhong block (Xinjiang Oilfield, China) from metagenome sequencing data based on reported SOB and SRB, reviewed metabolic pathways of sulfur oxidation and dissimilatory sulfate reduction, and ways for SRB control. The existing issues and future research of microbial sulfur cycle and SRB control are also discussed. Knowledge of the distribution of the microbial populations, their metabolic characteristics and interactions can help to develop an effective process to harness these microorganisms for oilfield production.
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Affiliation(s)
- Peike Gao
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China.
| | - Keyan Fan
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
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Onawole AT, Hussein IA, Saad MA, Ismail N, Alshami A, Nasser MS. Theoretical Studies of a Silica Functionalized Acrylamide for Calcium Scale Inhibition. Polymers (Basel) 2022; 14:polym14122333. [PMID: 35745909 PMCID: PMC9230130 DOI: 10.3390/polym14122333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/25/2022] [Accepted: 05/29/2022] [Indexed: 02/04/2023] Open
Abstract
The calcium carbonate (CaCO3) scale is one of the most common oilfield scales and oil and gas production bane. CaCO3 scale can lead to a sudden halt in production or, worst-case scenario, accidents; therefore, CaCO3 scale formation prevention is essential for the oil and gas industry. Scale inhibitors are chemicals that can mitigate this problem. We used two popular theoretical techniques in this study: Density Functional Theory (DFT) and Ab Initio Molecular Dynamics (AIMD). The objective was to investigate the inhibitory abilities of mixed oligomers, specifically acrylamide functionalized silica (AM-Silica). DFT studies indicate that Ca2+ does not bind readily to acryl acid and acrylamide; however, it has a good binding affinity with PAM and Silica functionalized PAM. The highest binding affinity occurs in the silica region and not the -CONH functional groups. AIMD calculations corroborate the DFT studies, as observed from the MD trajectory that Ca2+ binds to PAM-Silica by forming bonds with silicon; however, Ca2+ initially forms a bond with silicon in the presence of water molecules. This bonding does not last long, and it subsequently bonds with the oxygen atoms present in the water molecule. PAM-Silica is a suitable calcium scale inhibitor because of its high binding affinity with Ca2+. Theoretical studies (DFT and AIMD) have provided atomic insights on how AM-Silica could be used as an efficient scale inhibitor.
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Affiliation(s)
- Abdulmujeeb T. Onawole
- Gas Processing Center, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar; (A.T.O.); (M.A.S.); (M.S.N.)
| | - Ibnelwaleed A. Hussein
- Gas Processing Center, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar; (A.T.O.); (M.A.S.); (M.S.N.)
- Chemical Engineering Department, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar
- Correspondence: (I.A.H.); (A.A.)
| | - Mohammed A. Saad
- Gas Processing Center, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar; (A.T.O.); (M.A.S.); (M.S.N.)
- Chemical Engineering Department, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar
| | - Nadhem Ismail
- Department of Chemical Engineering, University of North Dakota, Grand Forks, ND 58202, USA;
| | - Ali Alshami
- Department of Chemical Engineering, University of North Dakota, Grand Forks, ND 58202, USA;
- Correspondence: (I.A.H.); (A.A.)
| | - Mustafa S. Nasser
- Gas Processing Center, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar; (A.T.O.); (M.A.S.); (M.S.N.)
- Chemical Engineering Department, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar
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