Optimization of non-ionic surfactants for removing emulsified oil from gas condensate oil–water emulsion in N oilfield

Lv, Peng; Liu, Yigang; Zhang, Yunbao; Sun, Lei; Meng, Xianxing; Meng, Xianghai; Zou, Jian

doi:10.1007/s13202-020-00950-0

Cited by 6 publications

(2 citation statements)

References 32 publications

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“…To destabilize the emulsion, the oil droplets must flocculate and eventually coalesce. Under such conditions, experimental results based on analysis of variance (ANOVA) show that the dosages of demulsifier, temperature, and sedimentation times are the key variables [136]. It is obvious that at higher temperatures, the Bjerrum length scale, which is the fundamental length scale at which thermal energy becomes comparable to electrostatic energy, will be relatively higher [137].…”

Section: Implications For Produced Oilfield Water Demulsification Wit...mentioning

confidence: 99%

Theoretical Interpretation of pH and Salinity Effect on Oil-in-Water Emulsion Stability Based on Interfacial Chemistry and Implications for Produced Water Demulsification

Miadonye,

Amadu

2023

Processes

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The petroleum industry produces thousands of barrels of oilfield waters from the initial stage driven by primary production mechanisms to the tertiary stage. These produced waters contain measurable amounts of oil-in-water emulsions, the exact amounts being determined by the chemistry of the crude oil. To meet strict environmental regulations governing the disposal of such produced waters, demulsification to regulatory permissible levels is required. Within the electric double layer theory, coupled with the analytical solutions to the Poisson–Boltzmann Equation, continuum electrostatics approaches can be used to describe the stability and electrokinetic properties of emulsions. In the literature, much of the surface charge density and zeta potential relationship to emulsion stability has been confined to systems with less salinity. In this paper, we have exploited the theoretical foundations of the electric double layer theory to carry out theoretical evaluations of emulsion salinity based on zeta potential and surface charge density calculations. Most importantly, our approaches have enabled us to extend such theoretical calculations to systems of the higher salinity characteristic of oil-in-water emulsions found in oilfield-produced waters, based on crude oil samples from the literature with varying surface chemistry. Moreover, based on the definition of acid crude oils, our choice of samples represents two distinct classes of crude oils. This approach enabled us to evaluate the stability of emulsions associated with these produced oilfield waters in addition to predicting the potential of demulsification using demulsifiers. Given that the salinity range of this study is that encountered with the vast majority of produced oilfield waters, the findings from our theoretical predictions are perfect guides as far as emulsion stability is concerned.

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Section: Implications For Produced Oilfield Water Demulsification Wit...mentioning

confidence: 99%

Theoretical Interpretation of pH and Salinity Effect on Oil-in-Water Emulsion Stability Based on Interfacial Chemistry and Implications for Produced Water Demulsification

Miadonye,

Amadu

2023

Processes

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“…Water in oil (W/O) emulsion generally exists in petrochemical industry, oilfield exploitation, development of heavy oil reservoirs, and resource and environmental engineering fields (Liu et al 2020;Lv et al 2020). The W/O emulsion is a colloidal dispersion of oil and water, where the water phase is dispersed in the oil phase (Ghasemi et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Separation characteristics and structure optimization of double spherical tangent double-field coupling demulsifier

Gong¹,

Qiu

Peng

et al. 2021

J Petrol Explor Prod Technol

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The demulsification and dewatering of the W/O emulsion are widely used in petrochemical industry, oilfield exploitation, and resource and environmental engineering. However, efficiently treating emulsion via traditional single methods. In this study, a new double-field coupling demulsification and dewatering device is proposed, where the conical structure of the device is double spherical tangential type. The numerical model for double-field coupling is established, especially, the population balance model (PBM) is used to simulate the coalescence and breakup of dispersed droplets under the double-field coupling action. And the effects of three conical structures on the internal flow and separation efficiency are analyzed. Results show that the conical structure has a significant effect on the coalescence of droplets, especially the double spherical tangential cone is more conducive for improving the coalescence ability of small droplets and improving the separation efficiency of the device. After optimization, the optimal R value of the double spherical tangential coupling device is 300 mm, and the separation efficiency can be up to 96.32%, which is 6.13% higher than the separation efficiency of the straight double-cone coupling device.

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The effect of molecular structure on the properties of cationic polyacrylate and its flocculation‐flotation performance of oilfield oily wastewater treatment

Zhang

Wang

et al. 2022

J of Applied Polymer Sci

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With the increasing amount of oily wastewater produced in the offshore oilfield, more efficient air flotation agent is needed to be developed. Cationic polyacrylate with amphiphilic structure has been found to be a type of potential efficient air flotation agent. However, the effect of molecular structure on its properties and performance was lack of research. In this paper, copolymers with tertiary amine as side group were synthesized by copolymerization of ethyl acrylate (EA) and tertiary amine monomers, and then a series of cationic polyacrylates were prepared by quaternization of tertiary amine with quaternization reagent.The effects of tertiary amine monomer type (including dimethylaminopropyl methacrylamide (DPM) and dimethylaminoethyl methacrylate (DEM)), quaternization reagent type (including 3-Chloro-1,2-Propanediol and 3-chloro-2-hydroxytrimethylammonium chloride) and quaternization degree on the cationic polyacrylate properties and its flotation performance were investigated. The experimental results showed that the flotation performance increased with the increasing hydrophilicity and cation degree of the hydrophilic unit in the cationic polyacrylate. When the tertiary amine monomer was DPM, quaternization reagent was 3-chloro-2-hydroxytrimethylammonium chloride, and theoretical quaternization degree was 100%, the oil removal of product PE-M-1.0 was the highest. When PE-M-1.0 dosage was 50 mg/L, gas flow was 1 L/min, flotation time was 10 min, its oil removal rate was higher than 95% in the range of 20-60 C. The results of zeta potential measurement and microfluidic experiment showed that PE-M-1.0 can increase the size of oil droplets by destroying the electric double layer on the surface of oil droplets and maintain the stability of bubbles, which was helpful for the improve of gas bubble-oil droplet collision probability and adhesion efficiency.

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Optimization of non-ionic surfactants for removing emulsified oil from gas condensate oil–water emulsion in N oilfield

Cited by 6 publications

References 32 publications

Theoretical Interpretation of pH and Salinity Effect on Oil-in-Water Emulsion Stability Based on Interfacial Chemistry and Implications for Produced Water Demulsification

Theoretical Interpretation of pH and Salinity Effect on Oil-in-Water Emulsion Stability Based on Interfacial Chemistry and Implications for Produced Water Demulsification

Separation characteristics and structure optimization of double spherical tangent double-field coupling demulsifier

The effect of molecular structure on the properties of cationic polyacrylate and its flocculation‐flotation performance of oilfield oily wastewater treatment

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