Vertical distribution of biofilm communities along an injection wellbore in a deep petroleum reservoir

Song, Zhiyong; Zhu, Pengrui; Xiao-ling, WU; Xu, Peng; Li, Hua; Du, Cuiwei; He, Xin; Yang, Lianzhi; Zhu, Weiyao

doi:10.1016/j.petrol.2021.109024

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…The Shannon index and Simpson index represented the div the bacterial communities. They not only reflected the species richness but also i the species evenness [31][32][33]. As shown in Table 2, in general, the ACE index a index of the bacteria in Block Hao41 were higher than those in Block An156, ind higher community abundance in Block Hao41.…”

Section: Richness and Diversity Of The Communitiesmentioning

confidence: 90%

Horizontal and Vertical Comparison of Microbial Community Structures in a Low Permeability Reservoir at the Local Scale

Zhi,

Bian,

Chen

et al. 2023

Microorganisms

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Petroleum microorganisms play a crucial role in the application of microbial-enhanced oil recovery, and the community structures of petroleum microorganisms have been widely studied. Due to variations in reservoir geological conditions, reservoir microbial communities exhibit unique characteristics. However, previous studies have primarily focused on microbial community changes within a single well, a single block, and before and after water flooding, and thus, cross-horizon and cross-regional comparative studies of in situ microbial communities are lacking. In this study, the 16S rRNA full-length sequencing method was adopted to study bacterial communities in crude oil samples taken from two wells at the same depths (depths of 2425 m and 2412 m) but approximately 20 km apart in the Hujianshan oilfield, located in the Ordos Basin. At the same time, the results were combined with another layer of research data from another article (from a depth of 2140 m). The aim was to compare the differences in the microbial community structures between the oil wells on a horizontal scale and a vertical scale. The results revealed that there were minimal differences in the microbial community structures that were influenced by the horizontal distances within a small range (<20 km), while differences were observed at a larger spatial scale. However, the dominant bacteria (Proteobacteria and Bacteroidetes) in the different oilfields were similar. Vertical depth variations (>300 m) had significant impacts on the communities, and this was mainly controlled by temperature. The greater the depth, the higher formation temperature, leading to an increase in thermophilic and anaerobic bacteria within a community.

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Section: Richness and Diversity Of The Communitiesmentioning

confidence: 90%

Horizontal and Vertical Comparison of Microbial Community Structures in a Low Permeability Reservoir at the Local Scale

Zhi,

Bian,

Chen

et al. 2023

Microorganisms

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“…In previous studies, several mechanisms had been revealed in MEOR, such as IFT reduction by biosurfactant [34], selective plugging and viscosity modification by biopolymers [35,36] and biofilm formation [37]. However, all these mechanisms played a dominant role independently to improve the oil recovery throughout the entire process, and they were not closely related to the oil saturation.…”

Section: The Long-term Experiments Reveals the Dominant Eor Mechanism...mentioning

confidence: 99%

Long-Term Pore-Scale Experiments on MEOR by Surfactant-Producing Microorganisms Reveal the Altering Dominant Mechanisms of Oil Recovery

Yu,

Li,

Song

et al. 2023

Energies

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During microbial-enhanced oil recovery (MEOR), surfactant-producing microorganisms are reported to improve displacement efficiency. However, the sweep efficiency could be improved by emulsified droplets or be reduced by low-IFT (interfacial tension)-induced fingering flow. Therefore, whether sweep efficiency can be improved by surfactant-producing microorganisms is currently unclear. To reveal the EOR mechanisms by surfactant-producing microorganisms, a 2D micro-model was used to conduct a long-term pore-scale experiment. In the results, 19.4% of the original oil in place (OOIP) was recovered, and surfactant-producing microorganisms can improve not only displacement efficiency (16.9% of the OOIP in the main stream) but also sweep efficiency (27.7% of the OOIP in the margin). Furthermore, the sweep efficiency was improved during flooding and shut-in periods. For instance, 19.5% of the OOIP in margins migrated to the main stream during the 1st shut-in period. Regarding mechanisms of sweep, it was improved by Jamin’s effect during the flooding period, while during the shut-in period, the oil migration was attributed to the spontaneously spreading biomass and their wettability altering the biosurfactant. This long-term experiment revealed that the dominant oil recovery mechanisms were altering with declining oil saturation, based on which sweep efficiency contributed to oil recovery only at oil saturation higher than 40.5%. While at lower oil saturation, only displacement efficiency could be improved.

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Comparison of microbial community structures between oil and water phases in a low-permeability reservoir after water flooding

et al. 2023

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Vertical distribution of biofilm communities along an injection wellbore in a deep petroleum reservoir

Cited by 3 publications

References 58 publications

Horizontal and Vertical Comparison of Microbial Community Structures in a Low Permeability Reservoir at the Local Scale

Horizontal and Vertical Comparison of Microbial Community Structures in a Low Permeability Reservoir at the Local Scale

Long-Term Pore-Scale Experiments on MEOR by Surfactant-Producing Microorganisms Reveal the Altering Dominant Mechanisms of Oil Recovery

Comparison of microbial community structures between oil and water phases in a low-permeability reservoir after water flooding

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