Effects of indigenous microbial consortia for enhanced oil recovery in a fragmented calcite rocks system

Gaytán, Itzel; Mejía, M.Á.; Hernández‐Gama, Regina; Torres, Luis G.; Escalante, C.A.; Muñoz-Colunga, Ana

doi:10.1016/j.petrol.2015.02.028

Cited by 20 publications

(5 citation statements)

References 29 publications

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“…Indigenous microbial communities inside the oil wells can change crude oil properties allowing it to show enhanced flow features and elevated sweep efficiency which is done by both stabilization of the interfacial tension and decreased viscosity (Gaytán et al, 2015). From a scientific aspect, the exogenous microorganisms will out-compete those microbes are already adapted to the harsh conditions in the reservoirs (Patel et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Characterization, production and optimization of lipopeptide biosurfactant by new strain Bacillus pumilus 2IR isolated from an Iranian oil field

Fooladi

Moazami

Abdeshahian

et al. 2016

Journal of Petroleum Science and Engineering

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Section: Introductionmentioning

confidence: 99%

Characterization, production and optimization of lipopeptide biosurfactant by new strain Bacillus pumilus 2IR isolated from an Iranian oil field

Fooladi

Moazami

Abdeshahian

et al. 2016

Journal of Petroleum Science and Engineering

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“…A bacterial consortium is particularly effective for microbial oil recovery compared with a single bacterial species, given that it displays a broader range of activities and secretes several metabolic products, including biogas, bioacids, biosolvents, biomass, biosurfactants, and biopolymers, which are potentially useful for oil recovery . Therefore, most of the activated endogenous microorganisms have positive effects for MEOR and blockage-removal effects for production wells.…”

Section: Resultsmentioning

confidence: 99%

Application of Bacillus spp. in Pilot Test of Microbial Huff and Puff to Improve Heavy Oil Recovery

et al. 2017

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Microbial metabolic products, such as biosurfactants, bioemulsifiers, acids, solvents, and biogases, are useful for reducing the viscosity of heavy oils and enhancing oil recovery. Two heavy oil viscosity-reducing microorganisms, namely, SH-2 and SH-3, were selected from produced water which were collected from high-temperature reservoirs by enrichment culture technique. The screened bacteria produce biosurfactants and biogases that can biodegrade heavy crude oil components. The screened bacteria combined with indigenous bacteria were applied in a pilot test of microbial huff and puff. Temperature, porosity, and permeability of the reservoir were 50 °C, 14.32%, and 22 mD, respectively. After microbial treatment, the 50 °C degassing for crude oil viscosity of the produced oil was decreased from 750 to 634 mPa•s. Moreover, wax and resin−asphaltene contents of produced oil were reduced by 12.3% and 16.9%, respectively. The average oil production was improved from 2.2 to 3.5 t/day after microbial treatment. The production remained stable without the chemical viscosity reducer for 54 days. The analysis of bacterial community structure indicated that the number of bacteria species increased and that the microbial diversity was highly abundant. However, harmful microorganisms for microbe-enhanced oil recovery, such as sulfate-reducing bacteria, are inhibited during the progress of microbial huff and puff.

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“…In this technology, in situ reconstruction of microbial community has been significantly focused along with the increasingly global concerns on environmental risks. Compared with other conventional oil recovery techniques, IMEOR is also able to save oil production costs with a decline in oil prices in recent years [1,2].…”

Section: Introductionmentioning

confidence: 99%

Nutrient Stimulation of Indigenous Microorganisms for Oil-in-Water Emulsion in a Medium Temperature Petroleum Reservoir with Ca2+-Rich Brine

Shi¹,

Jia

Bai³

et al. 2021

Geofluids

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One of the challenges indigenous microbial enhanced oil recovery (MEOR) is facing is the high percentage of divalent ions, which obstruct the growth and metabolism of microorganisms and destabilize the oil-in-water (o/w) emulsion. Six formulas were selected for the stimulation of indigenous microbes and to compare their performances on the oil emulsification and oil spreading in the Luliang oilfield containing Ca2+-rich brine. Illumina MiSeq sequencing of 16S rRNA genes was applied to investigate the structural response of microbial communities to various formulas. The results showed that the addition of proper organic phosphorus and the optimal P/N ratio (0.01) can facilitate production of biosurfactant and create stable o/w emulsion with specific reservoir condition containing Ca2+-rich brine, through direct stimulation of certain functional microbes. This study provides a promising path for direct enrichment of biosurfactant-producing and oil-degrading Dietzia genus and a potential instructional approach of indigenous MEOR in Luliang oilfield.

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Effects of indigenous microbial consortia for enhanced oil recovery in a fragmented calcite rocks system

Cited by 20 publications

References 29 publications

Characterization, production and optimization of lipopeptide biosurfactant by new strain Bacillus pumilus 2IR isolated from an Iranian oil field

Characterization, production and optimization of lipopeptide biosurfactant by new strain Bacillus pumilus 2IR isolated from an Iranian oil field

Application of Bacillus spp. in Pilot Test of Microbial Huff and Puff to Improve Heavy Oil Recovery

Nutrient Stimulation of Indigenous Microorganisms for Oil-in-Water Emulsion in a Medium Temperature Petroleum Reservoir with Ca2+-Rich Brine

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