Abstract
Microbiological and biogeochemical data on the Kongdian bed (block no. 1) of the Dagang high-temperature oilfield during trials of the biotechnology for enhanced oil recovery are reported. Oil-bearing horizons of block no. 1 are characterized by high temperature (56.9–58.4°C), complex geological conditions, and heavy oil (density 0.966–0.969 g/cm3). The biotechnology implied injecting oxygen as an air-water mixture or H2O2 together with aqueous solution of nitrogen and phosphorus mineral salts through injection wells in order to activate the oilfield microbial community. In the course of trials, an increase in abundance of aerobic and anaerobic microorganisms was revealed, as well as increased methanogenesis rate in formation water. Microbial oxidation of heavy oil resulted in increased concentration of mineral carbonates dissolved in formation water, changes in the stable carbon isotopic composition δ13C/Σ(CO2 + HCO3 - + CO3 2-), formation of biosurfactants, and decreased interfacial tension of formation water. Application of the biotechnology at the Kongdian bed (block no. 1) resulted in additional recovery of 6331 t oil. Oil viscosity in the zone of production wells located at the North block of the Kongdian bed decreased by 11%. A total of 46152 t additional oil was recovered at three experimental sites of the Dagang oilfield (North block and block no. 1 of the Kongdian bed and the Gangxi bed), which is an indication of high efficiency of the technology for activation of the oilfield microflora for heavy oil replacement from high-temperature oilfields.
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Original Russian Text © T.N. Nazina, Qingxian Feng, N.K. Kostryukova, N.M. Shestakova, T.L. Babich, Fangtian Ni, Jianqiang Wang, Liu Min, M.V. Ivanov, 2017, published in Mikrobiologiya, 2017, Vol. 86, No. 5, pp. 636–650.
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Nazina, T.N., Feng, Q., Kostryukova, N.K. et al. Microbiological and production characteristics of the Dagang high-temperature heavy oil reservoir (block no. 1) during trials of the biotechnology for enhanced oil recovery. Microbiology 86, 653–665 (2017). https://doi.org/10.1134/S0026261717050162
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DOI: https://doi.org/10.1134/S0026261717050162