Surfactant effects on the efficiency of oil sweeping from the dead ends: Numerical simulation and experimental investigation

Kamyabi, Ata; Ramazani, S A Ahmad; Kamyabi, Mohammadmahdi

doi:10.1016/j.cherd.2014.07.027

Cited by 12 publications

(7 citation statements)

References 11 publications

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“…40 The positive effects of the spontaneous microbial expansion can be supported by other pore-scale investigations, which demonstrated that the biosurfactant-producing strains could retrieve more residual oil from deep dead ends than biosurfactants or chemical surfactants alone. 12,31,48 However, the expansions into dead ends in the literature were within the branches directly connected to the flow channel, while the expansion in the present paper covered almost all of the pore spaces in the model. Thus, the gas-producing consortium showed a greater ability on expanding microbial activities and effects spontaneously, such as chemotaxis, reproduction, and biogas production.…”

Section: Energy and Fuelsmentioning

confidence: 72%

High-Pressure Microscopic Investigation on the Oil Recovery Mechanism by in Situ Biogases in Petroleum Reservoirs

et al. 2015

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Biogases, including CO2 and CH4, are an essential category of the complex metabolites in microbial enhanced oil recovery (MEOR). However, the recovery mechanisms and contributions of in situ biogases have not been individually studied. A microbial consortium from oil fields, which produced gases but few metabolites, was inoculated in microscopic flooding experiments mimicking reservoir pressure. Additional oil [14.8% of the original oil-in-place (OOIP)] was recovered. In terms of gas yields, porous media were favorable culturing substrates compared to bottles (up to 1.2 and 0.42 mL of biogas per mL of medium, respectively). Under pressurized reservoir conditions (8 MPa), contributions from typical mechanisms, including oil displacement and pressurization by gas bubbles, can be excluded as a result of the effective biogas dissolution in crude oil. The dissolved gases promoted the spontaneous expansion of microbial activities, so that 34.1% of the additional oil was recovered from the margin regions, area of which only occupied 19.76% of the model. Therefore, the significant sweep efficiency enhancement is suggested to be the dominant recovery mechanism exhibited by in situ biogases. The findings also provided a new perspective on the effects of CO2 and CH4 (natural gas) flooding on hydrocarbon migrations in reservoirs.

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Section: Energy and Fuelsmentioning

confidence: 72%

High-Pressure Microscopic Investigation on the Oil Recovery Mechanism by in Situ Biogases in Petroleum Reservoirs

et al. 2015

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“…12(b), e convexo quando é óleo-molhante, Fig. 12(c), [21]. Este comportamento é explicado porque sendo a água o fluido molhante se adere preferencialmente às paredes facilitando a remoção do óleo.…”

Section: E Efeito Da Tensão Interfacialunclassified

“…Sistemas molhantes à água resultam em melhores eficiências de recuperação. Esta tendência é coerente com os resultados da literatura [21]. Figura 13.…”

Section: E Efeito Da Tensão Interfacialunclassified

Pore-scale modeling of oil mobilization trapped in a square cavity

Coelho

Pena

Romero

2016

IEEE Latin Am. Trans.

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In this work, water is injected to displace oil from a micro square cavity. Fluids are incompressible, Newtonian and immiscible. The governing equations of the two-phase, transient, laminar, isothermal flow problem are solved numerically using Ansys Fluent software coupled with volume of fluid technique and appropriated numerical parameters. The qualitative and quantitative results are obtained following the volumetric oil fraction along the spatial domain and time. The methodology proposed allows a correct description of the oil displacement process, demonstrating its complexity and dependence of physical parameters. Oil recovery factor is higher when interfacial tension is low and water is the wetting fluid.Keywordsinterfacial dynamics, surface wettability, twophase flow, volume of fluid, recovery factor, square cavity. I. INTRODUÇÃOPETRÓLEO é uma das fonte energéticas mais importantes no mundo. Sustentar sua produção atendendo a demanda existente é portanto um desafio. Esta operação é crítica, e conforme destacado em [1], embora diversas técnicas sejam aplicadas para maximizar a eficiência do processo, apenas uma fração do óleo é efetivamente mobilizado. A produção em níveis econômicos ocorre enquanto a pressão do reservatório seja suficiente para vencer as perdas de carga existentes no próprio reservatório e ao longo do percurso [2,3,4,5,6].Para suprir esta eventual perda de pressão a implementação da injeção de água é um dos métodos mais difundidos nesta indústria. Permite manter a produção dos hidrocarbonetos em níveis economicamente viáveis e estáveis e normalmente o comportamento macroscópico do deslocamento é avaliado. Entretanto, para alcançar uma melhor eficiência deste processo, é necessário que se estude também o fenômeno em escala microscópica [1]. Nesta escala, e devido à estrutura do meio poroso, molhabilidade e às propriedades do óleo e fluidos injetados, encontra-se uma parcela do óleo retido. De acordo com [7] a retenção pode ocorrer na forma de (i) oil droplets ou glóbulos de óleo trapeados nas gargantas dos poros pelas forças capilares, observado fortemente em configurações onde a água adere preferencialmente a rocha; (ii) oil films ou películas de óleo sobre a superfície das rochas; e (iii) dead-ends que são cavidades propícias ao trapeamento de óleo.Um meio poroso real tem características complexas que tornam sua modelagem impraticável na maioria das situações.

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“…Complete water flooding is not a further relevant method in the EOR stage since this method is not able to lower the residual oil saturation, as well as causes viscos fingering due to the improper control of the mobility ratio between the displacing and displaced fluids. On the other hand, appropriate design of the surfactant flooding process helps increase the capillary number and relative permeability of the fluid, thereby allowing for much higher oil production [4][5][6]. In order to control the mobility ratio between the displacing and displaced fluids, a properly designed polymer is added [7,8].…”

Section: Introductionmentioning

confidence: 99%

Numerical studies on the effects of various complicated barrier configurations on sweep efficiency in surfactant/polymer flooding

Van

Chon

2016

Journal of Industrial and Engineering Chemistry

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Surfactant effects on the efficiency of oil sweeping from the dead ends: Numerical simulation and experimental investigation

Cited by 12 publications

References 11 publications

High-Pressure Microscopic Investigation on the Oil Recovery Mechanism by in Situ Biogases in Petroleum Reservoirs

High-Pressure Microscopic Investigation on the Oil Recovery Mechanism by in Situ Biogases in Petroleum Reservoirs

Pore-scale modeling of oil mobilization trapped in a square cavity

Numerical studies on the effects of various complicated barrier configurations on sweep efficiency in surfactant/polymer flooding

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