Viscoelastic surfactant fluids filtration in porous media: A <scp>pore‐scale</scp> study

Li, Yuan; Dai, Caili; Wu, Yining; Xu, Ke; Zhao, Mingwei; Wang, Yuhe

doi:10.1002/aic.16229

Cited by 7 publications

(2 citation statements)

References 46 publications

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“…Recently, nanofluids with high thermostability and interfacial activity attract more and more attention (Noreen et al 2016;Lu et al 2017). Previous studies have also indicated that nanofluids have shown the application potential in drag reduction, chemical flooding, filtration reducer and so on (Zhao et al 2018a, b;Ramesh and Prabhu 2011;Soltanipour et al 2016;Zhong et al 2011;Mu et al 2010;Zhao et al2018a, b;Hwang et al 2008;Dai et al 2020;Li et al 2020;Zhao et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Preparation and stabilization mechanism of carbon dots nanofluids for drag reduction

Cao

et al. 2020

Pet. Sci.

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During the development of low or ultra-low permeability oil resources, the alternative energy supply becomes a prominent issue. In recent years, carbon dots (CDs) have drawn much attention owing to their application potential in oil fields for reducing injection pressure and augmenting oil recovery. However, carbon dots characterized of small size, high surface energy are faced with several challenges, such as self-aggregation and settling. The preparation of stably dispersed carbon dots nanofluids is the key factor to guarantee its application performance in formation. In this work, we investigated the stability of hydrophilic carbon dots (HICDs) and hydrophobic carbon dots–Tween 80 (HOCDs) nanofluids. The influences of carbon dots concentration, sorts and concentration of salt ions as well as temperature on the stability of CDs were studied. The results showed that HICDs are more sensitive to sort and concentration of salt ions, while HOCDs are more sensitive to temperature. In addition, the core flooding experiments demonstrated that the pressure reduction rate of HICDs and HOCDs nanofluids can be as high as 17.88% and 26.14%, respectively. Hence, the HICDs and HOCDs nanofluids show a good application potential in the reduction of injection pressure during the development of low and ultra-low permeability oil resources.

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Section: Introductionmentioning

confidence: 99%

Preparation and stabilization mechanism of carbon dots nanofluids for drag reduction

Cao

et al. 2020

Pet. Sci.

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“…The success of this operation depends on whether the fracturing fluid has satisfactory rheological properties and a suitable proppant carrying capacity . Many novel fracturing fluids, such as viscoelastic surfactants (VESs), slick water, supramolecular polymers, energized fluids, and supercritical carbon dioxide (CO 2 ), have been designed and developed through oilfield chemistry research. − Nevertheless, traditional guar-based linear or cross-linked fracturing fluids are still the most commonly used fluids in oilfields due to their desirable performances and low costs. − …”

Section: Introductionmentioning

confidence: 99%

Development and Evaluation of an Acidic Shear-Tolerant Nanosheet-Enhanced Cross-Linked Gel System for Hydrofracturing

Zhang

Hou

2021

Energy Fuels

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Acidic fracturing fluids, such as zirconium cross-linked carboxymethyl hydroxypropyl guar gum (CMHPG), can not only adapt to formations treated with CO2 but also protect such formations from the damage that arises from the swelling and migration of clay particles during the hydrofracturing process. However, the shortcomings of uncontrollable viscosity growth and irreversible shear-thinning behavior limit the large-scale application of acidic fracturing fluids. In this work, a novel organic zirconium cross-linker was synthesized in the laboratory and applied under acidic conditions to control and delay cross-linking reactions. The ligands that were coordinated to the zirconium center were l-lactate and ethylene glycol. A CMHPG thickener was used at a low loading of 0.3% (approximately 25 pptg). Concentrated hydrochloric acid was utilized as a buffer to adjust the fracturing fluid pH to 3.0 for the majority of the tests and approximately simulate the pH attained in formations treated with CO2 under high-temperature (HT)/high-pressure (HP) conditions. Moreover, surface-functionalized metallic-phase (1T) molybdenum disulfide (MoS2) nanosheets were employed to improve the rheological performance of the zirconium cross-linked CMHPG fracturing fluid. l-Cysteine was utilized as a modification reagent. The morphologies, structures, and properties of the fabricated functionalized 1T-MoS2 (Cys-1T-MoS2) nanosheets were systematically characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The results of these characterization tests demonstrated the successful functionalization of the 1T-MoS2 nanosheets with l-cysteine. Then, the effects of this new nanosheet-enhanced zirconium cross-linked CMHPG fracturing fluid system with different cross-linker and nanosheet loadings on gelation performance were systematically assessed through the Sydansk bottle testing method combined with a rheometer under controlled-stress or controlled-rate modes. Microscopic observations and gel-breaking, regained-permeability, and proppant-settling tests were also carried out to further evaluate the fracturing fluid properties of this new system. The results indicated that the nanosheet-enhanced fracturing fluid had a desirable delayed cross-linking property. Compared with the blank fracturing fluid (without nanosheet enhancement), the nanosheet-enhanced fracturing fluid had a much better shear tolerance, shear recovery, and proppant carrying performance. Micrograph observations showed that an even and fine three-dimensional (3D) network structure formed within the nanosheet-enhanced fracturing fluid sample. Additionally, in contrast to the alkaline system, the acidic nanosheet-enhanced zirconium cross-linked CMHPG fracturing fluid system had much less formation damage induced by gel residues and clay swelling and dispersions.

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Investigation on the stability of mixed AlOOH/SiO2 aqueous dispersions and their application to stabilize Pickering emulsions in the presence of TX-100 and enhance oil recovery

Jia

Wang

et al. 2021

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Viscoelastic surfactant fluids filtration in porous media: A pore‐scale study

Cited by 7 publications

References 46 publications

Preparation and stabilization mechanism of carbon dots nanofluids for drag reduction

Preparation and stabilization mechanism of carbon dots nanofluids for drag reduction

Development and Evaluation of an Acidic Shear-Tolerant Nanosheet-Enhanced Cross-Linked Gel System for Hydrofracturing

Investigation on the stability of mixed AlOOH/SiO2 aqueous dispersions and their application to stabilize Pickering emulsions in the presence of TX-100 and enhance oil recovery

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