Modification of rock/fluid and fluid/fluid interfaces during MEOR processes, using two biosurfactant producing strains of Bacillus stearothermophilus SUCPM#14 and Enterobacter cloacae: A mechanistic study

Sarafzadeh, Pegah; Hezave, Ali Zeinolabedini; Mohammadi, Sahar; Niazi‎, Ali; Ayatollahi, Shahab

doi:10.1016/j.colsurfb.2013.12.002

Cited by 25 publications

(14 citation statements)

References 37 publications

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“…The final results showed that the cells of B. stearothermophilus SUCPM#14 adhere more into the oil/water interface compared to E. cloacae and change its rheological properties. Eventually, contradicting results revealed that biosurfactant produced by E. cloacae was able to considerably reduce the interfacial tension and alter the wettability of the rock(to neutral conditions)while biosurfactant produced by B. stearothermophilus SUCPM#14 was not very effective (Sarafzadeh, 2014). …”

Section: Enterobacter Cloacaementioning

confidence: 95%

Research Status of Surfactant Producing Microbiology in MEOR: A Review

Wang¹,

Li²,

Pan³

et al. 2017

dtmse

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Section: Enterobacter Cloacaementioning

confidence: 95%

Research Status of Surfactant Producing Microbiology in MEOR: A Review

Wang¹,

Li²,

Pan³

et al. 2017

dtmse

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“…37 A low RF value of 3.09% obtained during the MCF experiments with injected nutrients may be related to the development of a laboratory conditioning simulation module with the indigenous Geobacillus toebii R-32639 colonies; however, it was not the optimal response. 6,7,[41][42][43] The use of bioproducts (or biosurfactants) in drilling FO during MCF experiments may change the formation wettability from oil-wet to water-wet AC. The difference in RF value between these two techniques should be due to the oil recovery mechanisms involved with MCF experiments; fractured chalk blocks could be dependent on the wettability of the chalk, as the wettability has great impact on the fracture/matrix hydrocarbon exchange, 38,39 while the mechanisms of CO Fig.…”

Section: Microbial Core Ooding Experiments To Increase Crude Oil Promentioning

confidence: 99%

Laboratory simulation of microbial enhanced oil recovery using Geobacillus toebii R-32639 isolated from the Handil reservoir

2015

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Microbial enhanced oil recovery (MEOR) is a biological based technology to enhance crude oil (CO) recovery at old oil wells by manipulating function or structure or both of the microbial environments existing in oil reservoirs. Even if many biosurfactant-producing microbes can be found in different environments, the ability of Geobacillus toebii R-32639 to enhance CO recovery needs to be verified. In this study, artificial cores (ACs) are used to simulate the application of MEOR by three scenarios of injecting nutrients, microbial culture and bioproducts. The use of Geobacillus toebii R-32639 as biosurfactant producer enables a lowering by 25.3% of interfacial tension and by 14.1% of CO viscosity and also enables the degrading of a 7.4-28.8% fraction of (C 12 -C 34 ) hydrocarbons after 7 days of incubation. The injection of microbial culture into a laboratory-scale CO reservoir of the AC for the desirable purpose of enhanced oil recovery could feasibly achieve an average recovery factor of 14.27% but lower by 5.50% the AC porosity and by 91.0% the AC permeability; this is the best-case scenario of the microbial core flooding (MCF) experiments. The simulation of MEOR by using bacterial strains of Geobacillus toebii R-32639 provides valuable insight into the use of MCF experiments to obtain greater oil production from existing reservoirs.

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“…Microbial-Enhanced Oil Recovery (MEOR), which is regarded as a tertiary method to increase oil recovery, uses different microorganisms to extract trapped oil from the reservoirs [8,9]. Several mechanisms are proposed to explain the incremental oil recovery associated with MEOR, among which are the reduction in the oil-water IFT and changes in the wettability of the system and selective plugging mechanism [10][11][12][13]. Numerous experimental and numerical studies have been conducted to understand the impact of wettability alteration and IFT reduction [14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Pore-scale investigation of selective plugging mechanism in immiscible two-phase flow using phase-field method

Sabooniha

Rokhforouz

Ayatollahi

2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Biotechnology has had a major effect on improving crude oil displacement to increase petroleum production. The role of biopolymers and bio cells for selective plugging of production zones through biofilm formation has been defined. The ability of microorganisms to improve the volumetric sweep efficiency and increase oil recovery by plugging off high-permeability layers and diverting injection fluid to lower-permeability was studied through experimental tests followed by multiple simulations. The main goal of this research was to examine the selective plugging effect of hydrophobic bacteria cell on secondary oil recovery performance. In the experimental section, water and aqua solution of purified Acinetobacter strain RAG-1 were injected into an oil-saturated heterogeneous micromodel porous media. Pure water injection could expel oil by 41%, while bacterial solution injection resulted in higher oil recovery efficiency; i.e., 59%. In the simulation section, a smaller part of the heterogeneous geometry was employed as a computational domain. A numerical model was developed using coupled Cahn–Hilliard phase-field method and Navier–Stokes equations, solved by a finite element solver. In the non-plugging model, approximately 50% of the matrix oil is recovered through water injection. Seven different models, which have different plugging distributions, were constructed to evaluate the influences of selective plugging mechanism on the flow patterns. Each plugging module represents a physical phenomenon which can resist the displacing phase flow in pores, throats, and walls during Microbial-Enhanced Oil Recovery (MEOR). After plugging of the main diameter route, displacing phase inevitably exit from sidelong routes located on the top and bottom of the matrix. Our results indicate that the number of plugs occurring in the medium could significantly affect the breakthrough time. It was also observed that increasing the number of plugging modules may not necessarily lead to higher ultimate oil recovery. Furthermore, it was shown that adjacent plugs to the inlet caused flow patterns similar to the non-plugging model, and higher oil recovery factor than the models with farther plugs from the inlet. The obtained results illustrated that the fluids distribution at the pore-scale and the ultimate oil recovery are strongly dependent on the plugging distribution.

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Modification of rock/fluid and fluid/fluid interfaces during MEOR processes, using two biosurfactant producing strains of Bacillus stearothermophilus SUCPM#14 and Enterobacter cloacae: A mechanistic study

Cited by 25 publications

References 37 publications

Research Status of Surfactant Producing Microbiology in MEOR: A Review

Research Status of Surfactant Producing Microbiology in MEOR: A Review

Laboratory simulation of microbial enhanced oil recovery using Geobacillus toebii R-32639 isolated from the Handil reservoir

Pore-scale investigation of selective plugging mechanism in immiscible two-phase flow using phase-field method

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