Article
Engineering, Environmental
Hao Sun, Xiaoqing Li, Xiaobing Li
Summary: In this study, a novel PQA-PDA@Fe3O4 nanoparticle demulsifier was developed to efficiently demulsify asphaltene-rich ASP flooding emulsions. The nanoparticles demonstrated excellent demulsification efficiency by coalescing fine oil droplets into large aggregates and inhibiting secondary emulsification. The magnetic properties of the nanoparticles also accelerated the aggregation process and allowed for magnetic recyclability.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Chemistry, Physical
Zsofia Vargane Arok, Szilard Saringer, Dora Takacs, Coline Bretz, Adam Juhasz, Istvan Szilagyi
Summary: The study investigates the structural and rheological properties of a partially hydrolyzed polyacrylamide (FLOPAAM 3630S) in a wide range of salinity relevant to existing oil reservoir conditions. It is found that macromolecular solutions are present at low polymer concentrations and/or elevated salt levels, while gelation occurs at high FLOPAAM 3630S doses at low salinity. The driving force behind this transformation is determined to be hydrophobic intermolecular interactions. These findings provide new insights for the design of efficient enhanced oil recovery processes in oil reservoirs with varying salt levels.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Chemical
Xu Han, Changqing Li, Feng Pan, Yuxi Li, Yujun Feng
Summary: Compared with P-HPAM, E-HPAM showed shorter dissolution time, higher viscosity retention, lower interfacial tension, and higher oil recovery factor in a simulated Daqing Oilfield reservoir.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Wei Liu, Hongrui Fu, Mutai Bao, Xiaojun Sun, Xiao Ha, Yiming Li, Jinren Lu
Summary: This study investigates the use of aqueous solutions of dodecylbenzene sulfonic acid (DBSA) and hydrolyzed polyacrylamide (HPAM) to enhance oilfield recovery. The three ingredients, including DBSA, HPAM, and asphaltenes (ASP), play a synergistic role in stabilizing emulsions during oil recovery. The results show that when the three ingredients co-exist, they form a complex adsorption unit with DBSA dominating the system.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Xiaoqing Li, Dandan Liu, Hao Sun, Xiaobing Li
Summary: The effect of oil-displacing agent composition on the oil/water interface stability of asphaltene-rich ASP flooding-produced water was investigated. Molecular dynamics simulation and experimental tests were conducted to study the adsorption behavior of oil displacement agents and asphaltenes on the interface, as well as the variations in interfacial properties. The results showed that the interaction between oil displacement agents and asphaltenes enhanced the interfacial film strength and impeded the oil/water separation process.
Article
Chemistry, Physical
Jianping Xu, Yuanda Yuan, Zhen Feng, Feng Liu, Zhe Zhang
Summary: This paper uses molecular dynamics simulation method to study the transportation behavior of polymers in nanopores and describes their intera-ction, diffusion and adsorption behaviors, and viscoelastic properties, providing a theoretical basis for improving oil recovery in oilfields.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Environmental
Panqing Qi, Dejun Sun, Tao Wu, Yujiang Li
Summary: This study reveals the synergistic effects of nitrogen and carbon sources on the regulation of bio-demulsifying mechanisms by TD-4. Oil-soluble carbon sources mediate competitive adsorption-derived demulsification, while water-soluble carbon sources mediate bio-flocculation-derived demulsification. Nitrate reduction leads to the accumulation of nitrite, triggering stress response and upregulation of chaperone-associated genes, ultimately affecting bio-demulsifying mechanisms.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Energy & Fuels
Di Wu, Fujun Xia, Sen Lin, Xun Cai, Huiping Zhang, Wenjie Liu, Yinghui Li, Rui Zhang, Yuwei Zhang, Xin Zhang, Jianjun Yu, Nannan Guo
Summary: The effects of secondary emulsification of field ASP flooding produced fluid by centrifugal pumps and electrostatic field on oil/water separation performances were evaluated. It was found that secondary emulsification drastically downgraded the separation performances, especially in fluids with high surfactant content. The ASP flooding produced fluid had lower oil/water interfacial tension, making it more susceptible to shear and high strength electrostatic field.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Hai-Xia Yu, Xinxin Yu, Siwei Chen, Jingcheng Hao, Lu Xu
Summary: This study presents a dual-responsive and versatile lubricating emulsion composed solely of water, eco-friendly ester base oil, and synthetic cationic emulsifier. The emulsion exhibits efficient anticorrosion, antibiosis, and light-and magneto-responsiveness, thanks to the unique surfactant with azobenzene moiety, [CeCl3Br]- anion, and methylimidazole head-group. By exploiting the reversible photo-triggered hydrophobicity of the surfactant, an on-demand separation and recycling of emulsion components can be achieved, accompanied by a significant reduction in friction. Additionally, the emulsion lubricant demonstrates magnetically controlled migration and adaptivity to high normal loads, making it promising for applications in various industrial systems and smart devices.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Polymer Science
Mohammed Abdelfetah Ghriga, Seif El Islam Lebouachera, Nadjib Drouiche, Bruno Grassl
Summary: The viscoelastic behavior of a PEI crosslinked polymer gel prepared with a low hydrolysis/high molecular weight PHPA was investigated through dynamic shear measurements. Various parameters such as reactants concentrations, polymer's molecular weight, curing temperature, presence of inorganic salts, and solution's initial pH were systematically studied. The final gel strength varied with different parameters, with stronger gels formed at pH around 10 due to the asymmetrical effect of pH on the reactants.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Energy & Fuels
Wei Liu, Hongrui Fu, Xiaojun Sun, Mutai Bao, Xiao Han, Yiming Li, Jinren Lu
Summary: This study investigates the effects of asphaltene concentration, HPAM concentration, pH, oil/water ratio, and salinity on the stability and rheology of polymer-containing emulsions. The addition of HPAM changes the emulsion type from water-in-oil (W/O) to oil-in-water (O/W), and the shear modulus of the emulsions stabilized by HPAM and asphaltenes is significantly lower. The pH and the presence of inorganic salts also affect the stability of the emulsion. The interaction between the amide and carboxylic acid groups in HPAM molecules with asphaltenes is studied, providing a theoretical basis for the treatment of polymer-containing oil water/sludge in an efficient and environmentally friendly manner.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
R. Khalesi Moghaddam, S. Mhatre, H. W. Yarranton, G. Natale
Summary: Oil production and processing often involve the treatment of water-in-oil emulsions stabilized by asphaltenes. This study investigates the effect of ultrasonic waves on the interactions between asphaltene films and proposes a low-power ultrasound field as an effective method to break asphaltene-stabilized water-in-oil emulsions.
Article
Chemistry, Multidisciplinary
Saiful Hafiz Habib, Dina Kania, Robiah Yunus, Badrul Hisham Mohamad Jan, Dayang Radiah Awang Biak, Rabitah Zakaria
Summary: The study investigated the interaction between methyl ester sulfonate (MES) surfactant and polyacrylamide (PAM) polymer in alkaline-surfactant-polymer (ASP) flooding, finding a strong hydrophobic interaction affecting interfacial tension and the impact of PAM concentration on oil recovery in the process.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Shatha Al-Kindi, Saif Al-Bahry, Yahya Al-Wahaibi, Usman Taura, Sanket Joshi
Summary: Polyacrylamide is widely used in oil fields to enhance oil recovery, but it also produces a large quantity of toxic wastewater. The challenge is to remove or degrade polyacrylamide in an environmentally safe manner. Biodegradation with the aid of microbes is considered an efficient and environmentally friendly solution.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Energy & Fuels
Xiaoluan Yu, Hao Niu, Hua Li, Chunan Du, Zhiyong Song, Debin Kong, Weiyao Zhu
Summary: The rheology of a partially hydrolyzed polyacrylamide (HPAM) solution in polymer flooding is affected by sulfide ions, leading to viscosity loss and impacting oil recovery. Microscopic observations and visualization experiments combined with Micro-PIV provide insights into the changes in polymer morphology and pore scale flow fields induced by sulfide ions.
