Conversion of petroleum to methane by the indigenous methanogenic consortia for oil recovery in heavy oil reservoir

Xia, Wenjie; Shen, Weijun; Yu, Li; Chang, Zheng; Wu, Yu; Tang, Yongchun

doi:10.1016/j.apenergy.2016.03.059

Cited by 41 publications

(28 citation statements)

References 72 publications

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“…The degradation e ciency of different heavy oil fractions by bacterial consortia was reported to be 10.57-23.68% for alkanes, 6.03-20.62% for aromatics, and 3.63-16.90% for resins and asphaltenes [10,26,27]. By comparison, the fungal enzyme preparations from our Aspergillus cultures had higher abilities to degrade saturates, while the aromatic and resin fractions of heavy oil were relatively increased after enzymatic degradation.…”

Section: Effect Of Enzyme Concentration On Heavy Oil Degradationmentioning

confidence: 77%

“…High viscosity is a crucial factor responsible for poor heavy oil recovery [37]. Conventional methods for reducing oil viscosity include heating, emulsi cation, and dilution with light crude oil, which have the disadvantages of high cost in application and potential damage to the formation [10]. Therefore, we examined the potential use of fungal enzyme preparations to reduce oil viscosity in the present study.…”

Section: Viscosity Reduction Of Heavy Oilmentioning

confidence: 99%

“…The interactions of gas with oil, as well as the biotransformation of heavy oil fractions to lighter fractions, are mechanisms responsible for increasing the mobility and recovery of heavy oil [35]. Xia et al [10] reported that one enriched methanogenic consortium increased by 14.70% of the tertiary enhanced oil recovery by oil degradation and methane production in core ooding tests, and the gas production made the inner pressure of the microbial core holder increase from 0.2 to 20.45 MPa; the viscosity of the heavy oil was reduced by 72.45%. Biodegradation in oil reservoirs affects the quantity and quality of the crude oil; crude oil will become lighter and more valuable through degradation of heavy oil fractions [37].…”

Section: Viscosity Reduction Of Heavy Oilmentioning

confidence: 99%

“…microorganisms or their metabolites to increase recovery of residual oil; it was rst proposed in the 1920s and was developed in the early 1980s [8,9]. The main mechanisms of MEOR are [10]: (1) degradation of high-molecular-weight hydrocarbons to improve the liquidity of residual oil; (2) production of chemicals, such as biosurfactants, acids, solvents, and biopolymers that increase the oil sweep e ciency through altering oil/water/rock interfacial properties; and (3) generation of gases (CO 2 , N 2 , H 2 , and CH 4 ) that can dissolve in crude oil to reduce the oil viscosity and increase the reservoir pressure. MEOR technology has been actively pursued both in laboratory and eld conditions.…”

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confidence: 99%

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Microbial enhanced heavy oil recovery through biodegradation using fungal extracellular enzymes from Aspergillus spp.

Zhang

Gao

Lai

et al. 2020

Preprint

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Background: The progressive depletion of light crude oils has led to increased focus on efficient exploitation of heavy oil reserves to meet energy demand. Microbial enhanced oil recovery makes a substantial contribution to the recovery of heavy oils; however, most methods use bacteria, with less attention paid to the potential of fungi. In this study, we investigated the efficiency of fungal extracellular enzymes in biotransformation and biodegradation of heavy oil fractions into light compounds and the feasibility of the use of such enzyme preparations in enhanced oil recovery. Results: Two fungal strains of Aspergillus spp., isolated from bitumen samples, showed good growth on plates of mineral salts medium with heavy oil as the sole carbon source. The fungal extracellular enzymes, with dehydrogenase and catechol 2,3-dioxygenase activities, exhibited the ability to biodegrade heavy oil. The biodegradation process was coupled with abundant production of gases, mainly CO 2 and H 2 . Gas chromatography analysis revealed a significant redistribution of n -alkanes in the heavy oil after treatment with fungal enzyme preparations, which resulted in an increase in individual n -alkanes. The viscosity of the heavy oil was decreased 66.33% by fungal enzymatic degradation. Conclusions: These results demonstrate the potential of fungal extracellular enzymes from Aspergillus spp. for applications in enhanced heavy oil recovery, including biotransformation of heavy to lighter crude oil and byproduct biogas formation.

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Section: Effect Of Enzyme Concentration On Heavy Oil Degradationmentioning

confidence: 77%

Section: Viscosity Reduction Of Heavy Oilmentioning

confidence: 99%

Section: Viscosity Reduction Of Heavy Oilmentioning

confidence: 99%

mentioning

confidence: 99%

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Microbial enhanced heavy oil recovery through biodegradation using fungal extracellular enzymes from Aspergillus spp.

Zhang

Gao

Lai

et al. 2020

Preprint

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“…MEOR is a biologically-based technology that uses microorganisms or their metabolites to increase recovery of residual oil; it was first proposed in the 1920s and was developed in the early 1980s [8,9]. The main mechanisms of MEOR are [10]: (1) degradation of high-molecular-weight hydrocarbons to improve the liquidity of residual oil; (2) production of chemicals, such as biosurfactants, acids, solvents, and biopolymers that increase the oil sweep efficiency through altering oil/water/rock interfacial properties;…”

Section: Introductionmentioning

confidence: 99%

Microbially enhanced heavy oil recovery through biodegradation using fungal extracellular enzymes from Aspergillus spp.

Zhang

Gao

Lai

et al. 2019

Preprint

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Background: The progressive depletion of light crude oils has led to increased focus on efficient exploitation of heavy oil reserves to meet energy demand. Microbial enhanced oil recovery make a significant contribution to the recovery of heavy oils; however, most use bacteria, with less attention paid to the potential of fungi. Therefore, this study proposes the use of fungi in the form of extracellular enzymes to degrade heavy oil and improve its physicochemical property , thus increasing fluidity of heavy oil.Results: In this study, we investigated the efficiency of fungal extracellular enzymes in biotransformation and biodegradation of heavy oil fractions into light aliphatic and aromatic compounds and the feasibility of the use of such enzyme preparations in enhanced oil recovery. Two strains of Aspergillus spp., isolated from bitumen samples, showed good growth on plates of mineral salts medium with heavy oil as the sole carbon source. The fungal extracellular enzymes, with dehydrogenase and catechol 2,3-dioxygenase activities, exhibited the ability to degrade heavy oil, and coupled with abundant gas production. Gas chromatography analysis revealed a significant redistribution of n -alkanes in the heavy oil caused by the action of the fungal enzymes, resulting in an increase in individual n -alkanes. The viscosity of the heavy oil was decreased 66.33% by fungal enzymatic degradation. Conclusions: These results demonstrate the potential of extracellular enzymes from Aspergillus spp. for applications in enhanced heavy oil recovery, including biotransformation of heavy to lighter crude oil and byproduct biogas formation.

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Application of Biosurfactants for Microbial Enhanced Oil Recovery (MEOR)

Correia

Rodrigues

Teixeira

et al. 2021

Biosurfactants for a Sustainable Future

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Conversion of petroleum to methane by the indigenous methanogenic consortia for oil recovery in heavy oil reservoir

Cited by 41 publications

References 72 publications

Microbial enhanced heavy oil recovery through biodegradation using fungal extracellular enzymes from Aspergillus spp.

Microbial enhanced heavy oil recovery through biodegradation using fungal extracellular enzymes from Aspergillus spp.

Microbially enhanced heavy oil recovery through biodegradation using fungal extracellular enzymes from Aspergillus spp.

Application of Biosurfactants for Microbial Enhanced Oil Recovery (MEOR)

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