Study on the association behavior of a hydrophobically modified polyacrylamide in aqueous solution based on host-guest inclusion

Kang, Wanli; Zhu, Zhou; Yang, Hongbin; Tian, Shujie; Wang, Pengxiang; Zhang, Xiangfeng; Lashari, Zeeshan Ali

doi:10.1016/j.molliq.2018.11.063

Cited by 33 publications

(11 citation statements)

References 46 publications

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“…Four main synthesis methods, including micellar, homogeneous, heterogeneous, and revised homogeneous copolymerization, have been summarized with the works performed for this subject over the past decade, tabulated in Table S1 of the Supporting Information. Micellar copolymerization with a large amount of surfactant is the most used method. − However, a surfactant is undesirable because it may cause chain transfer effects and difficulties in purification of the resulting polymers. , Homogenous copolymerization generally involves organic solvent that is neither environmentally friendly nor easy to remove, and the resulting polymers are usually not soluble in the reaction medium . Heterogenous copolymerization, such as inverse emulsion polymerization, requiring both surfactant and organic solvent, is also rarely used .…”

Section: Introductionmentioning

confidence: 99%

Heavy Oil Viscosity Reduction Performance of Novel Water-Soluble Terpolymers

Liu

Wang

et al. 2019

Energy Fuels

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A series of water-soluble terpolymers, poly(acrylamide/N-vinylpyrrolidone/N-(acrylamido propyl)-N,N-dimethyl,N-cetyl ammonium bromide) (ANAs), were synthesized through free radical copolymerization in water and applied for heavy oil viscosity reduction of Bohai heavy oil with high salinity. Test results showed that the solution of ANA-4 with a concentration of 1000 mg/L possesses moderate surface and interfacial activities, which could afford not only the optimal heavy oil viscosity reduction rate of 98.8% by emulsification under the high-salinity and high-temperature reservoir condition but also the fast dehydration of the formed oil-in-water emulsion within 2 h while standing at normal temperature. More importantly, dehydrated water was confirmed to be reusable with a heavy oil viscosity rate of more than 98% after 4 cycles. The mechanism of heavy oil viscosity reduction via emulsification and dehydration via demulsification was also discussed. The study provides an efficient and environmentally friendly candidate for heavy oil viscosity reduction under high-salinity conditions compared to previous heavy oil viscosity reducers.

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Section: Introductionmentioning

confidence: 99%

Heavy Oil Viscosity Reduction Performance of Novel Water-Soluble Terpolymers

Liu

Wang

et al. 2019

Energy Fuels

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“…A similar behavior has been reported in the literature for PAM-based polymers with different compositions and chemical structures than that described in this work. 39,47,48 Based on the physical conditions of the reservoirs (salinity and temperature) especially those from Mexico, salt (NaCl) was added to the aqueous polymer solution to reach different concentrations of salt 0.5, 2, and 5 M, respectively. The aqueous polymer solution with a concentration of 5 wt% displayed great solubility at 0.5 and 2 M NaCl while phase separation was observed when 5 M NaCl was added.…”

Section: Resultsmentioning

confidence: 99%

“…22 Generally, these experimental attempts were performed in sandstone reservoirs under low brine concentration and regular temperature below 100 C. Several investigations were developed by different authors and reported the impact of the polymer architecture, molar composition, salt concentration, and temperature on the ability of these prepared materials to be used as rheological modifiers in the EOR process. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] In this work, an associative water-soluble terpolymer was synthesized, characterized, and evaluated at laboratory level in order to determine its performance to act as a thickening agent, that is, a potential candidate to improve the oil recovery process. Experiments were performed in the presence of heavy crude oil sample from a carbonated reservoir located in southern México.…”

Section: Introductionmentioning

confidence: 99%

Behavior study of a thermo‐responsive hydrophobically associative water‐soluble terpolymer in laboratory test with heavy crude oil

Torres‐Martínez

Pérez-Álvarez²,

Jiménez‐Regalado³

et al. 2022

J of Applied Polymer Sci

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In this work, a thermo‐responsive hydrophobically associative water‐soluble terpolymer was prepared and evaluated as polymer flooding in laboratory tests versus a heavy crude oil from a carbonated reservoir in southern Mexico. Terpolymer of acrylamide, N‐isopropylacrylamide and N,N′‐dihexylacrylamide were synthesized via micellar free radical polymerization. Reaction was carried out at 50°C using sodium dodecyl sulfonate as surfactant and 4‐(4′‐azobis)cyanovaleric acid as initiator. The terpolymer was characterized by nuclear magnetic resonance. Steady shear viscosity of polymer solutions at different concentrations was determined in the presence of NaCl (from 1 to 5 wt%) at different temperatures (from 25 to 120°C). Heavy crude oil sample was characterized and revealed a viscosity of 2. 26 Pa s, 10.21° API with a content of Saturates, Aromatics, Resins, Asphaltenes of 26.4, 38.5, 22.3, and 12.8, respectively. The crude oil recovery of polymer at 2 and 3 wt% revealed a surface tensions of 49.6 and 48.2 mN × m and adsorption capacities of 1.33 and 1.77 wt%. Finally, polymer solutions at 2 and 3 wt% showed a contact angle between 29.6 and 26.5° and a crude oil recovery of 68.3 and 75.3%, respectively.

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“…Nevertheless, the viscosity of PAM and HPAM solutions tends to decrease sharply in extreme environments with high-salinity, high-temperature and high-shear rates [7,8]. In order to cope with the challenges brought by these harsh conditions in EOR application, hydrophobically associating polymers, because of their unique properties, have attracted the attention of many researchers at home and abroad in recent decades [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of amphiphilic hydrophobically associative polymer/ montmorillonite nanocomposites

Bai

Yue

et al. 2020

R. Soc. open sci.

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In this research, a novel amphiphilic hydrophobically associative polymer nanocomposite (ADOS/OMMT) was prepared using acrylamide (AM), sodium 4-vinylbenzenesulfonate (SSS), N, N′-dimethyl octadeyl allyl ammonium bromide (DOAAB) and organo-modified montmorillonite (OMMT) through in situ polymerization. Both X-ray diffraction patterns and transmission electron microscopy images verified the dispersion morphology of OMMT in the copolymer matrix. Then, the effect of the introduction of OMMT layers on the copolymer properties was studied by comparing with pure copolymer AM/SSS/DOAAB (ADOS). The thermal degradation results demonstrated that the thermal stability of the ADOS/OMMT were better than pure copolymer ADOS. During the solution properties tests, ADOS/OMMT nanocomposite was superior to ADOS in viscosifying ability, temperature resistance, salt tolerance, shear resistance and viscoelasticity, which was because OMMT contributed to enhance the hydrophobic association structure formed between polymer molecules. Additionally, the ADOS/OMMT nanocomposite exhibited more excellent interfacial activity and crude oil emulsifiability in comparison to pure copolymer ADOS. These performances indicated ADOS/OMMT nanocomposite had good application prospects in tertiary recovery.

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Study on the association behavior of a hydrophobically modified polyacrylamide in aqueous solution based on host-guest inclusion

Cited by 33 publications

References 46 publications

Heavy Oil Viscosity Reduction Performance of Novel Water-Soluble Terpolymers

Heavy Oil Viscosity Reduction Performance of Novel Water-Soluble Terpolymers

Behavior study of a thermo‐responsive hydrophobically associative water‐soluble terpolymer in laboratory test with heavy crude oil

Preparation and properties of amphiphilic hydrophobically associative polymer/ montmorillonite nanocomposites

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