Demulsification of produced liquid from surfactant-polymer flooding

Yang, Jingyi; Ban, Wenning; Han, Zhongjuan; Xu, Xiang

doi:10.1080/01932691.2018.1472010

Cited by 7 publications

(7 citation statements)

References 26 publications

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“…16 Therefore, chemical flooding is widely used to enhance oil recovery and prolong oilfield life. 17–19…”

Section: Introductionmentioning

confidence: 99%

“…16 Therefore, chemical flooding is widely used to enhance oil recovery and prolong oilfield life. [17][18][19] With the development of technology, alkaline surfactant polymer (ASP) flooding technology has been gradually applied in the field. Because of the good synergistic effect of surfactant and alkali in ASP flooding, the addition of polymer can improve sweep efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of oil recovery by surfactant-polymer synergy flooding: A review

Yao

Zhong

et al. 2022

Polymers and Polymer Composites

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With the depletion of conventional resources, it is necessary to enhance the recovery of remaining oil. The tertiary oil recovery chemical flooding is the most promising for enhanced oil recovery (EOR). The use of alkali in chemical flooding produces fouling with the formation, which brings new challenges to chemical flooding EOR. So, alkali-free surfactant-polymer (SP) flooding is used as a new solution for EOR. The polymer makes the displacing fluid have a high viscosity and increases the swept volume. The surfactant can decrease the interfacial tension and emulsify the crude oil while the displacing fluid reaches the corresponding area. The synergistic effect of the two is more conducive to the recovery of the remaining oil. As a result, SP flooding is a more practical approach to enhance oilfield EOR. The research status of several surfactant and polymer types for EOR is reported in this work. According to the study, complex and anionic surfactants are better for EOR. For difficult formations, SP flooding is more suited because of the presence of polymers. Additionally, study analysis demonstrates that SP flooding and alternative polymer injection, when employed at the same cost, can enhance EOR and assist in resolving issues brought on by low oil prices.

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“…16 Therefore, chemical flooding is widely used to enhance oil recovery and prolong oilfield life. 17–19…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of oil recovery by surfactant-polymer synergy flooding: A review

Yao

Zhong

et al. 2022

Polymers and Polymer Composites

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“…To improve oil recovery, chemical flooding has gradually replaced conventional primary and secondary oil recovery techniques such as water flooding and gas flooding. − The use of chemical flooding to enhance oil recovery has been proven to be effective, and the injection of chemicals such as surfactants makes the production of emulsions easier. − The formation of an emulsion is due to the interaction of solid impurities, colloids, asphaltene, and other components in crude oil as well as chemical reagents in the process of crude oil production and operation, which forms a rigid, viscoelastic, and stable interface membrane at the oil–water interface. − This interfacial membrane makes the emulsion very stable. , The presence of emulsions is hazardous to crude oil production systems, since water may lead to equipment corrosion, pump malfunction, and even safety problems. , Mechanical, electrical, thermal, and chemical demulsifications are the common demulsification and dehydration techniques for crude oil. Among them, the chemical demulsification method has been widely studied because of its rapid and efficient demulsification. − Alves et al analyzed the demulsification activity of a demulsifier based on a synthetic chemical surfactant of castor oil and discussed the demulsification mechanism.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Study of a New Type of Nonanionic Demulsifier for Chemical Flooding Emulsion Demulsification

et al. 2021

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The application of chemical flooding improves the stability of the produced emulsion, which reduces the demulsification efficiency of conventional demulsifiers. To improve the demulsification effect, in this paper, a new multibranched nonanionic polyether demulsifier, FYJP, was prepared by grafting carboxylate based on a nonionic demulsifier. The FYJP demulsifier could generate an initiator through p-tert-butylphenol, triethylenetetramine, and methanol, which was polymerized with ethylene oxide (EO) and propylene oxide (PO) to produce a nonionic polyether demulsifier. Sodium chloroacetate was used to modify the polyether demulsifier to obtain a new type of nonanionic polyether demulsifier. The FYJP polyether demulsifier was characterized by the hydrophilic−lipophilic balance (HLB) value, relative solubility (RSN), and surface activity of the demulsifier, and the demulsification mechanism was analyzed by a microscopic demulsification process test, and the effect of demulsifier dosage on the demulsification effect was discussed. Meanwhile, a dehydration test was carried out. The experimental results showed that the highest dehydration rate of the demulsifier was 94.7% at 85 °C, 100 ppm demulsifier dosage, 50 mL of a W/O emulsion, and 120 min demulsification time. The abovementioned studies show that FYJP is an effective demulsifier for chemical flooding emulsions, and this work promises to provide a reference for future demulsifier research.

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“…First of all, the existence of oil–water emulsion increases the burden of storage and transportation. Second, the inorganic salts in the oil–water emulsion not only poison the catalysts in the process of crude oil refining but also bring serious corrosion of oil pipelines and high-temperature distillation equipment. , If a large number of oily sewage is discharged in large quantities without treatment, it will seriously pollute the ecological environment and damage the land and water bodies. Therefore, the crude oil-in-water emulsion must be demulsified before transporting, refining, or discharging.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Liu

Zhong

et al. 2021

Energy Fuels

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In this study, attapulgite (AT) and graphene oxide (GO) nanosheets were grafted together via a silane coupling agent to synthesize attapulgite−graphene oxide (AT−GO) composites and apply them to remove the emulsified oil from the oily wastewater. The structure and morphology of the AT−GO composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, zeta potential measurements, and transmission electron microscopy. The amphiphilicity of the AT−GO composites was evaluated by visual observation of their distribution in the oil−water mixture. The results showed that the AT−GO composites have been successively prepared and have good amphiphilic and interfacial activity. The effects of the pH, demulsifier dosage, temperature, and the mass ratio of AT and GO (R A/G ) in the composites on the demulsification performance of AT−GO were studied. It was found that the demulsification process could be completed efficiently and quickly at room temperature. Under optimal demulsification conditions, the demulsification efficiency is above 95%. The demulsification mechanism was studied and discussed. It is believed that the interaction behavior between the AT−GO material and the emulsified molecules of asphaltenes is a key for the demulsification. Once the nanoparticles are combined with the emulsified molecules, the external stirring, vibration, and other mechanical actions provide them enough kinetic energy to destroy the protective film at the oil/water interface and then promote the merging of dispersed oil droplets to realize the oil−water separation.

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Demulsification of produced liquid from surfactant-polymer flooding

Cited by 7 publications

References 26 publications

Enhancement of oil recovery by surfactant-polymer synergy flooding: A review

Enhancement of oil recovery by surfactant-polymer synergy flooding: A review

Synthesis and Study of a New Type of Nonanionic Demulsifier for Chemical Flooding Emulsion Demulsification

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

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