Demulsification of water-in-heavy oil emulsions by oxygen-enriched non-ionic demulsifier: Synthesis, characterization and mechanisms

Zhang, Xincheng; He, Changqing; Zhou, Jingjing; Tian, Ying; He, Lin; Li, Xingang

doi:10.1016/j.fuel.2022.127274

Cited by 25 publications

(12 citation statements)

References 66 publications

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“…As far as NID is concerned, its use is still limited to demulsification purposes; only a recent study has actually examined the breaking mechanism of water-in-heavy oil emulsions driven by oxygen-enriched NID. 17 Hence, the present investigation carried out further measurements on viscosity and elastic modulus to affirm the effectiveness of NID in the presence of the produced emulsions. This work would definitely be of great interest to oilfield operators as emulsion formation has an enormous impact on crude oil productivity and operational cost.…”

Section: Introductionmentioning

confidence: 80%

“…Also, this work reports the demulsification of emulsions formed using a newly laboratory-grown nonionic demulsifier (NID) by condensation of fatty acid with amine. As far as NID is concerned, its use is still limited to demulsification purposes; only a recent study has actually examined the breaking mechanism of water-in-heavy oil emulsions driven by oxygen-enriched NID . Hence, the present investigation carried out further measurements on viscosity and elastic modulus to affirm the effectiveness of NID in the presence of the produced emulsions.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Varying Oil–Water Contents on the Formation of Crude Oil Emulsion and Its Demulsification by a Lab-Grown Nonionic Demulsifier

Adewunmi,

Hussain,

Patil

et al. 2024

ACS Omega

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This study describes how varying oil/water contents affect emulsion formation and the impact they have on emulsion droplet size, viscosity, and interfacial behavior. Crude oil (continuous phase) volume fractions of 40, 50, 60, and 70 vol % were probed in the various W/O emulsions formed. Experimental results from optical morphology revealed the emulsion droplets kept reducing as the crude oil fraction kept increasing, while the droplets were nearly unnoticeable in the emulsions derived from 60 and 70% crude oil. The viscosity–shear rate of emulsions produced from 40, 50, and 60 vol % crude oil exhibited a non-Newtonian behavior owing to the substantial volume of water content in their emulsions, whereas the viscosity–shear rate of the emulsion with 70 vol % crude oil exhibited a Newtonian behavior similar to the pure crude oil, suggesting a thorough blending of oil–water at this crude oil fraction. Besides, the viscosity–temperature measurements revealed that the viscosity of these emulsions diminished as the temperature increased and the viscosity reduction became more noticeable in an emulsion comprising 70 vol % crude oil. In the interfacial assessment, the increased crude oil content in the produced emulsion led to a sharp reduction in the interfacial tension (IFT). The IFT values after 500 s contacts between the emulsion and water (surrounding phase) were 11.86, 10.02, 8.08, and 6.99 mN/m for 40, 50, 60, and 70 vol % crude oil, respectively. Demulsification experiments showed that water removal becomes more challenging with a large volume of crude oil and a small water content. Demulsification performances of the lab-grown nonionic demulsifier (NID) after 10 h of demulsification activity at room temperature (25 °C) were 98, 90, 17.5, and 10% for the emulsions formed from 40, 50, 60, and 70 vol % crude oil, respectively, indicating that the demulsification degree decreases with an increasing crude oil content. Viscosity–time determination was applied to affirm the activity of NID on the emulsion formulated with a 50% crude oil fraction. The injection of NID in this emulsion triggered a sharp viscosity reduction, indicating the adsorption of NID at the oil–water interface and disruption of emulsifiers, enabling emulsion stability.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Influence of Varying Oil–Water Contents on the Formation of Crude Oil Emulsion and Its Demulsification by a Lab-Grown Nonionic Demulsifier

Adewunmi,

Hussain,

Patil

et al. 2024

ACS Omega

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“…However, tight oil has intricate oil-water (OW) zones, low porosity, and cannot be easily extracted using conventional techniques, posing challenges [1]. Large-scale development of tight reservoirs typically requires horizontal wells and hydraulic fracturing [2,3]. However, during fracturing, fluid readily enters the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Oil-Water Two-Phase Flow in Low Permeability Tight Reservoirs Based on Weighted Least Squares Meshless Method

Liu,

Yan,

Fang

et al. 2024

FDMP

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In response to the complex characteristics of actual low-permeability tight reservoirs, this study develops a meshless-based numerical simulation method for oil-water two-phase flow in these reservoirs, considering complex boundary shapes. Utilizing radial basis function point interpolation, the method approximates shape functions for unknown functions within the nodal influence domain. The shape functions constructed by the aforementioned meshless interpolation method have δ-function properties, which facilitate the handling of essential aspects like the controlled bottom-hole flow pressure in horizontal wells. Moreover, the meshless method offers greater flexibility and freedom compared to grid cell discretization, making it simpler to discretize complex geometries. A variational principle for the flow control equation group is introduced using a weighted least squares meshless method, and the pressure distribution is solved implicitly. Example results demonstrate that the computational outcomes of the meshless point cloud model, which has a relatively small degree of freedom, are in close agreement with those of the Discrete Fracture Model (DFM) employing refined grid partitioning, with pressure calculation accuracy exceeding 98.2%. Compared to high-resolution grid-based computational methods, the meshless method can achieve a better balance between computational efficiency and accuracy. Additionally, the impact of fracture half-length on the productivity of horizontal wells is discussed. The results indicate that increasing the fracture half-length is an effective strategy for enhancing production from the perspective of cumulative oil production.

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“…For example, the biomimetic separation devices with the properties of gradient structure similar to cactus or nasal cavity, [11,12] the filter membrane materials with differences in wettability, [13,14] the superwetting materials with charged coating, [15,16] and the chemical demulsifiers added to destroy the emulsion structure have all achieved great progress. [17,18] However, although traditional chemical demulsification systems have achieved relatively high separation efficiency, [19][20][21][22] the recycling and pollution of demulsifiers in vast water areas still need to be considered. For open coastal ocean pollution requiring continuous treatment, contactless and additive-free methods remain to be developed.…”

Section: Introductionmentioning

confidence: 99%

Contactless Interfacial Thin‐Film Breaking Caused Splash‐Like Demulsification of Floating Micron Emulsions via Ionic Wind

Dai

Yang

Feng

et al. 2023

Adv Funct Materials

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Emulsified oil leakage onto the bulk water surface causes severe issues on global ecology and health. Developing efficient, rapid, and universal separation methods of emulsions has been a significant topic in scientific studies. However, a contactless and additive‐free strategy to achieve continuous floating emulsion separation and oil collection remains to be discovered. Herein, a universal contactless demulsification, transportation, and collection method to dispose floating emulsions by ionic wind, which contains active charged particles generated by corona discharge is reported. The splash‐like demulsification process of floating emulsions is attributed to the rupture of water film enveloped on oil droplet surface, simultaneously and respectively. The evidence of this process recorded by a high‐speed camera with 20 000 fps has a referential significance for other works. This study may clean up universal floating emulsions discharged on water in real situations such as oil stations, chemical plants, and restaurants, and furthermore increase the potential of remote control in liquid dynamics by corona discharge.

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Demulsification of water-in-heavy oil emulsions by oxygen-enriched non-ionic demulsifier: Synthesis, characterization and mechanisms

Cited by 25 publications

References 66 publications

Influence of Varying Oil–Water Contents on the Formation of Crude Oil Emulsion and Its Demulsification by a Lab-Grown Nonionic Demulsifier

Influence of Varying Oil–Water Contents on the Formation of Crude Oil Emulsion and Its Demulsification by a Lab-Grown Nonionic Demulsifier

Numerical Simulation of Oil-Water Two-Phase Flow in Low Permeability Tight Reservoirs Based on Weighted Least Squares Meshless Method

Contactless Interfacial Thin‐Film Breaking Caused Splash‐Like Demulsification of Floating Micron Emulsions via Ionic Wind

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