Application of α-amylase as a novel biodemulsifier for destabilizing amphiphilic polymer-flooding produced liquid treatment

Jiang, Jiatong; Wu, Hairong; Lu, Yao; Ma, Tao; Li, Zhe; Xu, Derong; Kang, Wanli; Bai, Baojun

doi:10.1016/j.biortech.2018.03.069

Cited by 27 publications

(11 citation statements)

References 38 publications

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“…For emulsions of 50 mg/L BANs, the higher G ′ value is measured over the whole sweep frequency range, demonstrating an apparent solidlike behavior of emulsions. The elasticity of the interfacial film is positively related to the strength of the interfacial film . The higher the elasticity value is, the higher the interfacial film strength is.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The elasticity of the interfacial film is positively related to the strength of the interfacial film. 67 The higher the elasticity value is, the higher the interfacial film strength is. The higher G′ value of the emulsions also suggests that the BANs can adsorb at the oil− water interfaces, promoting the formation of the threedimensional network structures with high mechanical strength.…”

Section: Droplet Size Distribution and Morphologies Of Bans Emulsionsmentioning

confidence: 99%

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Amphiphilic Rhamnolipid Molybdenum Disulfide Nanosheets for Oil Recovery

Hou

Liang

et al. 2021

ACS Appl. Nano Mater.

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Much attention has been directed toward amphiphilic nanosheets in diverse applications owing to their remarkable properties. In this work, the rhamnolipid-molybdenum disulfide nanosheets, environmentally friendly biological-amphiphilic-nanosheets (BANs), are prepared through the one-step simple hydrothermal method. The ultralow concentration of BANs (0.005 wt %), as a solid emulsifier, can emulsify crude oil and stabilize the size of emulsions (oil in water) within 1.2 μm. The adsorption of BANs to the oil−water interface improves the stability of the BANs emulsion, and it both reduces interfacial tension and increases interfacial film strength. Tremendous desorption energy (thousands of K B T) is required to remove a single BAN from the interface to the bulk phase. Besides, BANs can turn an oil-wet surface into an intermediate-wet surface and spread to exfoliate oil film on the solid surface. The evolution of the three-phase contact line experiences two stages: a steep stage and a gentle stage. The spreading behaviors are due to an imbalance between the surface forces and structuring disjoining pressure at the confinement region (wedge film). Moreover, 25.3% of additional oil recovery was observed from the flooding of an ultralow concentration of BANs nanofluid (0.005 wt %) in a natural outcrop core, which is 2.5 mD in permeability at experimental conditions: 120 °C and around 25 × 10 4 mg/L in salinity. The high tolerance of rhamnolipid-molybdenum disulfide nanosheets to high temperature and harsh salinity is because of synergism between MoS 2 nanosheets and rhamnolipid molecules. Additional residual oil reduction is due to a combination of multiple effects such as crude oil emulsification, wettability alteration, interfacial tension reduction, and formation of structuring disjoining pressure. This study presents the possibility to enhance oil recovery in low-permeability reservoirs with harsh conditions.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Droplet Size Distribution and Morphologies Of Bans Emulsionsmentioning

confidence: 99%

Amphiphilic Rhamnolipid Molybdenum Disulfide Nanosheets for Oil Recovery

Hou

Liang

et al. 2021

ACS Appl. Nano Mater.

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“…This phenomenon can be observed by a decrease in viscosity at the macroscale as observed by Kolotova et al 38 and a reduction of G ′ at the microscale as exhibited in Figure 8a and other references. 14,15,21…”

Section: Resultsmentioning

confidence: 99%

“…Viscosity average molecular weight ( M η) was measured at 25 °C in methanol as described in the reference. 15 For poly(propylene oxide), the corresponding Mark–Houwink parameters of K and α were 76.9 × 10 –3 and 0.55, respectively. 45…”

Section: Methodsmentioning

confidence: 99%

“…Whether this modified demulsifier can be applied to actual oilfield production is evaluated by simulated equipment. In addition, viscoelastic measurement of model crude oil in demulsification is performed by a specified Physica MCR301 rheometer (Anton Paar, Austria) or AR-G2 stress-controlled rheometer (TA, USA). − Meanwhile, whether other rheometers without above fixtures like a HAAKE MARS III rheometer can be applied to demulsification research through simple parameter adjustments has been tried in this article.…”

Section: Introductionmentioning

confidence: 99%

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Practical Modification of Tannic Acid Polyether Demulsifier and Its Highly Efficient Demulsification for Water-in-Aging Crude Oil Emulsions

Liu

et al. 2019

ACS Omega

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In order to break the aging crude oil (WACO) emulsion of the offshore platform more effectively, a highly active isocyanate, polyaryl polymethylene isocyanate (PAPI), was selected to modify the pilot-scale tannic acid demulsifier. In the addition of PAPI, its molecular weight and viscosity dramatically increased, while its relative solubility, hydroxyl number, and cloud point exhibited an opposite direction, showing an increase in hydrophobicity. After adding the above modified demulsifier, a remarkably improved water removal of WACO emulsion accompanied by a notable reduction of the water content in the oil phase monitored by the Karl Fischer method was observed. Demulsification on the offshore platform demonstrated that the best water removal was achieved when the proportion of PAPI is 1.5 wt %. Its demulsification efficiency reached 95.7%, which was 25.6% higher than the 76.2% of unmodified demulsifier. In addition, a positive correlation between viscoelasticity of emulsion and demulsification performance was found by only adjusting the parameters of the rheometer. This method may be utilized to characterize the demulsification performance by any rotary rheometer. The pilot-scale demulsification experiment demonstrated that the water removal can reach 98.14 vol % and residual water content was only 0.55 vol %. These results further confirmed the excellent demulsification performance of the modified demulsifier toward the WACO emulsion in production.

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Demulsifier: An Important Agent in Breaking Crude Oil Emulsions

et al. 2022

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Effectively breaking an emulsion is very important in the petroleum industry since the produced crude oil is accompanied by water, which is linked to emulsions and can cause various environmental issues. To resolve these issues, surfactants are combined with crude oil to achieve a stable emulsion. In turn, failure to effectively break the crude oil emulsion can later have both commercial and technical impacts on this industry, mostly in the transportation, refining, and treatment facilities. This review considers some past and current studies on crude oil, the formation and stability of emulsions, the demulsification process and its mechanisms, techniques used to break crude oil emulsions, and formulations of demulsifiers. It demonstrates that combinations of one or more separation modes and demulsification modeling can improve the efficiency of breaking crude oil emulsions.

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Application of α-amylase as a novel biodemulsifier for destabilizing amphiphilic polymer-flooding produced liquid treatment

Cited by 27 publications

References 38 publications

Amphiphilic Rhamnolipid Molybdenum Disulfide Nanosheets for Oil Recovery

Amphiphilic Rhamnolipid Molybdenum Disulfide Nanosheets for Oil Recovery

Practical Modification of Tannic Acid Polyether Demulsifier and Its Highly Efficient Demulsification for Water-in-Aging Crude Oil Emulsions

Demulsifier: An Important Agent in Breaking Crude Oil Emulsions

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