Effect of Silica Nanoparticles on Wormlike Micelles with Different Entanglement Degrees

Zhao, Mingwei; Gao, Zhibin; Dai, Caili; Sun, Xin; Zhang, Yue; Yang, Xiujie; Wu, Yining

doi:10.1002/jsde.12252

Cited by 11 publications

(11 citation statements)

References 43 publications

(50 reference statements)

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“…The transport of proppant depends on the viscosity characteristics of the system in this case. At high oscillation frequency, the storage modulus G′ is greater than the loss modulus G″, and the system exhibits solid phase properties, and the transport of proppant depends on the elastic characteristics of the system (Rehage and Hoffmann, 1988;Zhao et al, 2019). When the oscillation frequency is 1.60 Hz, the system storage modulus G′ is equal to the loss modulus G″, and the reciprocal of the oscillation frequency is referred to as the relaxation time, which is 0.63 s. In addition, at higher oscillation frequencies, the storage modulus G′ is basically unchanged, while the loss modulus G″ decreases first and then increases again with the increase of frequency.…”

Section: Viscoelastic Performance Of Fracturing Fluid Systemmentioning

confidence: 99%

A novel CO2 sensitive and recyclable viscoelastic fluid system for fracturing

Sun²,

Dai³

et al. 2022

Front. Earth Sci.

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Hydraulic fracturing is one of the most commonly used processes of stimulating oil and gas wells to improve the production in low permeability reservoirs or damaged wells. In response to the serious water waste caused by the flowback fluid after the fracturing operation and the huge environmental pressure, a novel CO2 sensitive and recyclable viscoelastic fracturing fluid was developed. This CO2 sensitive property allows fracturing fluids to be recycled. The system consists of viscoelastic surfactants called fatty methyl ester sulfonates (FMES), triethylenetetramine and NaCl. The system shows a strong sensitivity to CO2. When the system is repeatedly contacted and separated from CO2, the viscosity rises and falls rapidly and regularly. The experiments of viscoelasticity, shear resistance and microstructure confirmed that the increasing viscosity of the system after contacting with CO2 was caused by the formation of viscoelastic fluid. When the system leak-off into the formation matrix, the microstructure of the system will be rapidly destroyed under the action of hydrocarbons, and the viscosity will drop to 1.225 mPa·s. Low viscosity after destroying reduces the retention of the system in the formation, resulting in formation damage rate of less than 35%. This research not only provides high-performance, low-cost fracturing fluids, but also provides new insights for the recovery and utilization of fracturing fluids.

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Section: Viscoelastic Performance Of Fracturing Fluid Systemmentioning

confidence: 99%

A novel CO2 sensitive and recyclable viscoelastic fluid system for fracturing

Sun²,

Dai³

et al. 2022

Front. Earth Sci.

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“…The NPs can increase the zero-shear viscosity η 0 , relaxation time τ rel , and the plateau modulus G 0 of VES fluids ( Figure 2 ) [ 94 , 96 , 98 , 99 , 100 , 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 ]. The most pronounced is the effect of NPs on the viscosity, which can augment by up to 3 orders of magnitude [ 94 , 96 , 98 , 99 , 100 , 104 , 105 , 106 , 107 , 108 , 110 , 111 ]. It can be attributed to the hindered reptation of WLMs as their motion slows down in the vicinity of NPs.…”

Section: Nanoparticle-enhanced Ves Fluidsmentioning

confidence: 99%

“…In some papers [ 94 , 105 , 107 , 111 ], it was observed that upon the gradual increase in the amount of added NPs (at a constant concentration of surfactant) the zero-shear viscosity first increases, reaches a maximum, and then starts to decline. For instance, in VES fluid composed of a C22-tailed cationic surfactant N-erucamidopropyl-N,N-dimethyl-N-allylammonium bromide (EDAA) and negatively charged SiO 2 particles, the maximum value of viscosity was observed at as low an amount of NPs as 0.01 wt %, and the further increase in the NP concentration resulted in the decrease in viscosity, which became even lower than the viscosity of the initial VES solution [ 94 ].…”

Section: Nanoparticle-enhanced Ves Fluidsmentioning

confidence: 99%

“…For enhancement of the performance of VES fluids, different types of NPs were used, including silica SiO 2 [ 94 , 96 , 100 , 105 , 110 , 111 ], barium titanate BaTiO 3 [ 99 ], magnetite Fe 3 O 4 [ 104 , 109 , 113 ], MnO [ 114 ], ZnO [ 103 , 114 ], TiO 2 [ 115 ], and carbon nanotubes [ 108 ]. It was shown that among these NPs, long nanotubes induce a smaller increase in viscosity than spherical NPs [ 108 ].…”

Section: Nanoparticle-enhanced Ves Fluidsmentioning

confidence: 99%

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Novel Trends in the Development of Surfactant-Based Hydraulic Fracturing Fluids: A Review

Shibaev

Осипцов

Philippova

2021

Gels

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Viscoelastic surfactants (VES) are amphiphilic molecules which self-assemble into long polymer-like aggregates—wormlike micelles. Such micellar chains form an entangled network, imparting high viscosity and viscoelasticity to aqueous solutions. VES are currently attracting great attention as the main components of clean hydraulic fracturing fluids used for enhanced oil recovery (EOR). Fracturing fluids consist of proppant particles suspended in a viscoelastic medium. They are pumped into a wellbore under high pressure to create fractures, through which the oil can flow into the well. Polymer gels have been used most often for fracturing operations; however, VES solutions are advantageous as they usually require no breakers other than reservoir hydrocarbons to be cleaned from the well. Many attempts have recently been made to improve the viscoelastic properties, temperature, and salt resistance of VES fluids to make them a cost-effective alternative to polymer gels. This review aims at describing the novel concepts and advancements in the fundamental science of VES-based fracturing fluids reported in the last few years, which have not yet been widely industrially implemented, but are significant for prospective future applications. Recent achievements, reviewed in this paper, include the use of oligomeric surfactants, surfactant mixtures, hybrid nanoparticle/VES, or polymer/VES fluids. The advantages and limitations of the different VES fluids are discussed. The fundamental reasons for the different ways of improvement of VES performance for fracturing are described.

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“…19,21 Based on the concentration and ionic strength of components as well as molecular architecture, self-assembly of surfactants forms micelles of varying shapes such as spherical micelles, 22 rod-like micelles, 23 vesicles, 24 and wormlike micelles (WLM). 25,89 Because of the formation of entanglement, overlap and networks, long and exible WLM in an aqueous system exhibit excellent viscoelastic characteristics similar to the polymer solution but no residues. 26,27 Several researchers studied the clean fracturing uid with high ow back rate, low friction, and low damage to the formation with the surfactant system.…”

Section: Introductionmentioning

confidence: 99%