Rheological properties of a hydrophobically modified anionic polymer: Effect of varying salinity and amount of hydrophobic moieties

Viken, Alette Løbø; Skauge, Tormod; Spildo, Kristine

doi:10.1002/app.43520

Cited by 12 publications

(3 citation statements)

References 23 publications

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“…Over the cross‐point ( G ″ < G ′) from Maxwell model, the shape of storage and loss moduli curves indicate the formation of dots that superimposed on a slow relaxation process. In general, the oscillatory behavior displayed in Figure 7 is similar to the others studied samples 60–64 . At low frequencies, the slopes of G ′ and G ″ curves from Maxwell model of these samples are 2 and 1, respectively.…”

Section: Resultssupporting

confidence: 80%

“…In general, the oscillatory behavior displayed in Figure 7 is similar to the others studied samples. [60][61][62][63][64] At low frequencies, the slopes of G 0 and G 00 curves from Maxwell model of these samples are 2 and 1, respectively. These outcomes from oscillatory measurements described the viscoelastic properties and entanglements of polymeric chains from aqueous saline polymer solutions at different concentration of salt.…”

Section: Oscillatory Shear Measurementsmentioning

confidence: 89%

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Synthesis and rheological properties of water soluble ionic copolymers as modifier fluids at high temperature and saline media

Jiménez‐Regalado¹,

Gómez²,

Cadenas‐Pliego³

et al. 2023

J of Applied Polymer Sci

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Polymer flooding depicts an interesting strategy to improve the enhanced oil recovery (EOR). This work aims with the synthesis of ionic thermo‐responsive copolymers able to be used as rheological modifiers for EOR under harsh conditions (250,000 ppm of NaCl at 150°C). Copolymers composed of different molar ratio of acrylamide, N‐isopropylacrylamide and 2‐acrylamide‐2‐methyl‐1‐propanesulfonic acid were prepared in aqueous media via free radical polymerization at 50°C using 4,4′‐azobis(‐4″‐cyanopentanoic) acid (ACPA) as initiator. Nuclear magnetic resonance analyses demonstrated the structure and molar composition of synthesized copolymers. Rheological measurements performed at different concentration from 1 to 8 wt% demonstrated an increase in the viscosity from 2000 to 600,000 mPa.s. Aqueous mixtures of polymer at 5 wt% and NaCl at different concentration (5, 10, 15, 20, and 25 wt%) was analyzed. Copolymer ([PAM]/[PNIPAM] = 50/50) displayed a phase separation at 15 wt% of NaCl. Solutions of polymer at 5 and 25 wt% of NaCl were heated at 150°C for 72 h. Results revealed both thermal stability and saline tolerance of copolymers [PAM]/[PNIPAM]/[PAMPS‐Na] = 25/25/50, 35/35/30, and 50/0/50 under harsh conditions with the absence of phase separation of the brine polymer solutions.

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Section: Resultssupporting

confidence: 80%

Section: Oscillatory Shear Measurementsmentioning

confidence: 89%

Synthesis and rheological properties of water soluble ionic copolymers as modifier fluids at high temperature and saline media

Jiménez‐Regalado¹,

Gómez²,

Cadenas‐Pliego³

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Sometimes, there will be an intersection where Gʹ = Gʺ, tan = 1 and the frequency at this intersection is denoted as ω*. The lower the intersection frequency ω*, the more obvious the elasticity of the solution will be (Viken et al 2016). The elasticity also can be interpreted by the value of tan , that is, a higher tanδ value suggests more prominent elasticity of the solution, at the same frequency.…”

Section: The Influence Of Salt On Viscoelastic Properties Of Tvpmentioning

confidence: 99%

A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs

Yin

Zhang

et al. 2019

Pet. Sci.

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Inter-salt shale oil reservoirs located between two salt layers are always accompanied by high temperature and high salinity. However, the present commonly used water-soluble polymers in fracturing fluids suffer from poor tolerance to high temperature and high salinity. Thermoviscosifying polymers (TVP) whose aqueous solution shows viscosity increase upon increasing temperature and salt concentration have received considerable attention recently, which is promising for utilization in fracturing fluids to overcome these problems. In this work, both the salt-induced viscosifying property and mechanism of a TVP solution were investigated and the performance of TVP used as fracturing fluid based on the conditions of the Jianghan inter-salt shale oil reservoir in China was evaluated. It is found that the salt-induced viscosifying property of the TVP solution decreases with temperature and shear rate, but increases with polymer concentration. The number of intermolecular hydrophobic domains increases with the salt concentration contributing to the strengthening of a 3D network structure, which results in an increase in viscosity. In addition, the TVP fracturing fluid formulated with saturated brine exhibits excellent temperature and shear resistance, sand-suspending performance, and gel-breaking performance. Its viscosity remains above 50 mPa s after being sheared for 1 h even at a high temperature of 140 °C and the sand-suspending stability can be maintained for more than 1 week at 100 °C. Furthermore, the fracturing fluid can be easily broken down within 12 h using 0.2 wt%-0.3 wt% potassium persulfate without residue.

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Impact of additives on the rheological properties of associating water‐soluble multiblock polyelectrolytes

Muñoz-López¹,

Thomas

Garcı́a-Cerda³

et al. 2021

J of Applied Polymer Sci

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The impact of additives on the rheological behavior of four associating water‐soluble multiblock polyelectrolytes previously synthesized via reversible addition‐fragmentation chain transfer (RAFT) polymerization was described. These polyelectrolytes contained different number of blocks ranged from 1 to 7 divided into hydrophilic and hydrophobic. The rheological analyses of polymers were performed at 25°C at a given concentration (0.1–15 wt%) in the presence of sodium chloride (NaCl) 0.1–0.5 M, sodium dodecyl sulfate (SDS) 2–10 mM or a mixture of both. Data demonstrated an increase in the viscosity of macroRAFT (ɳ = 0.002–9 Pa·s) and triblock copolymer‐TBC (ɳ = 0.003–0.04 Pa·s) versus the concentration of NaCl. Meanwhile, the viscosity of penta and heptablock copolymer exhibited a diminution whatever the (NaCl) used. Results from the rheological analyses of the associative polyelectrolytes at different (SDS) revealed that the viscosity of macroRAFT and triblock copolymer was kept constant in spite of the increment of the (SDS) while the viscosity of PBC and HBC displayed a pronounced diminution at the lower (SDS). Finally, the results from the rheological analyses of these polyelectrolytes versus a mixture of NaCl‐SDS showed a diminution in the viscosity of these solutions at any concentration of additives.

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Rheological properties of a hydrophobically modified anionic polymer: Effect of varying salinity and amount of hydrophobic moieties

Cited by 12 publications

References 23 publications

Synthesis and rheological properties of water soluble ionic copolymers as modifier fluids at high temperature and saline media

Synthesis and rheological properties of water soluble ionic copolymers as modifier fluids at high temperature and saline media

A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs

Impact of additives on the rheological properties of associating water‐soluble multiblock polyelectrolytes

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