Dehydration of water-in-crude oil emulsions using polymeric demulsifiers: A model for water removal based on the viscoelastic properties of the oil–water interfacial film

Li, Zuoli; Fuentes, Jessica V.; Chakraborty, Anirban; Zamora, Edgar B.; Prasad, Vinay; Vázquez, F.; Xu, Zhenghe; Liu, Qingxia; Flores, César; McCaffrey, William C.

doi:10.1016/j.fuel.2022.126185

Cited by 13 publications

(4 citation statements)

References 26 publications

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“…Li et al . found that there is a relationship between the water separated of demulsifier and the elastic modulus of W/O interface as follows. W normalf , normalc = 100 lg ( G 1 ′ / G d e m u l s i f i e r ′ ) lg ( G 1 ′ / A c r u d e ) + 3.95 where W f,c is the final water separated, G demulsifier ′ is the elastic modulus after the addition of demulsifier, G 1 ′ is the elastic modulus before demulsifier was added, and A is the asphaltene content of crude oil.…”

Section: Resultsmentioning

confidence: 99%

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Effect of the Surfactant Type on the Demulsification of the W/O Crude Oil Emulsion Produced by Surfactant–Polymer Flooding

Zhang,

Wang,

Liang

et al. 2024

ACS Omega

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At present, there are many works on the influences of partially hydrolyzed polyacrylamide (HPAM) and surfactant on the stability and treatment of O/W emulsion produced by surfactant−polymer (SP) flooding. However, there are few related reports on the effects of HPAM and surfactant on the demulsification of W/O crude oil emulsion produced by SP flooding. Especially, there is no report on the effect of the surfactant type. In this paper, sodium dodecyl sulfate (SDS), octylphenol polyoxyethylene ether (OP-10), and alkyl C16−18 hydroxypropyl sulfobetaine (HSB1618) were selected as representatives of the anionic surfactant, nonionic surfactant, and zwitterionic surfactant, respectively. Demulsification experiments and interface behavior experiments were conducted to investigate their influences on the demulsification performance of a demulsifier D1. The results showed that the order of the negative effect of the surfactant type on dehydration speed and the dehydration rate of D1 was HPAM + OP-10 > HPAM + HSB1618 > HPAM + SDS. There is no difference in the effect of three surfactants on the conformation adjustment of D1 at the W/O interface, but the properties of the composite W/O interface formed by them and D1 were different. The coalescence time was longest when there were HPAM and OP-10 in water, while the lg(G 1 ′/ G demulsifier ′)/lgG 1 ′ was the smallest, which led to the most difficult demulsification of W/O emulsion. This work can guide surfactant selection during SP flooding from the perspective of produced fluid treatment.

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Section: Resultsmentioning

confidence: 99%

“…Li et al 20 found that there is a relationship between the water separated of demulsifier and the elastic modulus of W/O interface as follows.…”

Section: Interfacial Elastic Modulusmentioning

confidence: 99%

Effect of the Surfactant Type on the Demulsification of the W/O Crude Oil Emulsion Produced by Surfactant–Polymer Flooding

Zhang,

Wang,

Liang

et al. 2024

ACS Omega

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“…In the petroleum industry, dehydration of emulsions is crucial to meet market and transportation standards for water and salt content . In complex suspensions or dispersions, where particles are dispersed in a base fluid, , droplet motion can be influenced by external force fields − and surface tension gradients. , The manipulation of droplet motion through external force fields is a common practice in various fields, such as crude oil dehydration, , electrowetting, − and microfluidics . Electric fields and magnetic fields are frequently used external force fields that can have a significant impact on the dynamic behavior of droplets.…”

Section: Introductionmentioning

confidence: 99%

Microscopic Mechanism for Gradient Diffusion of Salt-Containing Droplets Induced by Electromagnetic Synergy: A Molecular Dynamics Study

Guo,

Du,

Ling

et al. 2024

Langmuir

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The electromagnetic synergy has been proven to be highly effective in separating oil−water emulsions. However, the dynamic impact mechanism of electromagnetic fields on the internal structure of salt droplets remains unclear. In this study, the molecular dynamics (MD) simulation was used to investigate the molecular diffusion of salt ions and water molecules, as well as the dynamic behavior of droplets under the combined influence of electromagnetic fields. The results indicate that ions accumulate in the electromagnetic synergistic field, causing the deformation amplitude of droplets to be smaller than that in a single electric field. The magnetic field affects the energy of the system, when the magnetic field strength is between 1 and 5T, the nonbonded energy significantly increases nonlinearly; when the magnetic field strength is greater than 5T, the total energy of the system significantly changes. In addition, the viscosity of the medium is significantly lower when the intensity of the magnetic and electric fields is controlled within a specific range, providing a new way to regulate the fluidity of fluids.

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“…Tese emulsions increase crude oil viscosity and cause corrosion in various pieces of equipment such as pipelines, pumps, and tanks. Furthermore, the ions in these emulsions poison downstream catalysts [8,9]. Terefore, dehydration of these emulsions is crucial to avoid these issues.…”

Section: Introductionmentioning

confidence: 99%

Application of New Ammonium-Based Ionic Liquids for Dehydration of Crude Oil Emulsions

Abdullah

Ali

Al‐Lohedan

2023

Journal of Chemistry

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Crude oil emulsions are prevalent in the petroleum industries due to different natural emulsifiers in crude oil. In addition, adding amphiphilic compounds for enhanced oil recovery at high temperatures and pressure under extreme shear stress conditions improved the stability of these emulsions. However, these emulsions are not desirable because they cause different operational problems. Herein, this work aims to synthesize and characterize two novel ionic liquids (ILs) and apply them to the dehydration of water-in-crude oil (W/O) emulsions. For that, tetraethylene glycol (TEG) was reacted with thionyl chloride (TC), yielding dialkyl halide (TEC). After that, TEC was reacted with 4-hexylaniline (HA) or 4-tetradecylaniline (TA) in the presence of sodium carbonate, obtaining the amines TC-HA and TC-TA, respectively. Finally, TC-HA and TC-TA were reacted with acetic acid, yielding the corresponding ionic liquids, THA-IL and TTA-IL. Chemical structure, surface tension (ST), interfacial tension (IFT), thermal stability, and micelle size were investigated using various techniques. The conventional bottle test was used to evaluate the performance of these ILs for dehydration W/O emulsion at different crude oil/brine ratios (ranging from 90/10 to 50/50). The results indicated that the dehydration performance (DP) increased with an increase in IL concentration. In addition, DP improved with increased water contents, reaching 100% for THA-IL and 80% for TTA-IL, respectively, at a crude oil/brine ratio of 50/50. Furthermore, TTA-IL showed higher DP and separated more clear water than THA-IL, which could be linked to its higher ability to reduce IFT due to a longer alkyl chain than THA-IL. The results showed that the synthesized ILs could serve as demulsifiers in the petroleum industry.

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Dehydration of water-in-crude oil emulsions using polymeric demulsifiers: A model for water removal based on the viscoelastic properties of the oil–water interfacial film

Cited by 13 publications

References 26 publications

Effect of the Surfactant Type on the Demulsification of the W/O Crude Oil Emulsion Produced by Surfactant–Polymer Flooding

Effect of the Surfactant Type on the Demulsification of the W/O Crude Oil Emulsion Produced by Surfactant–Polymer Flooding

Microscopic Mechanism for Gradient Diffusion of Salt-Containing Droplets Induced by Electromagnetic Synergy: A Molecular Dynamics Study

Application of New Ammonium-Based Ionic Liquids for Dehydration of Crude Oil Emulsions

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