Nanosilica-induced high mechanical strength of nanocomposite hydrogel for killing fluids

Sun, Feifei; Lin, Meiqin; Dong, Zhaoxia; Zhang, Juan; Wang, Cheng; Wang, Shuanglong; Song, Feifei

doi:10.1016/j.jcis.2015.07.006

Cited by 45 publications

(25 citation statements)

References 22 publications

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“…(a), absorption peaks at 3418 and 1645 cm −1 were attributed to NH and CO of CPAM, and the absorption peak at 553 cm −1 was ascribed to CN of CPAM. Figure (b) shows that the nanocomposite was composed of 1‐CB and CPAM, and peaks at 3507, 3400, 1645, 1394, 1126 and 634 cm −1 were characteristic vibrations of 1‐CB and CPAM, the peaks being slightly shifted . In conclusion, FT‐IR spectra can confirm that1‐CB/CPAM had been synthesized.…”

Section: Resultsmentioning

confidence: 61%

Synthesis of nanocomposites from cationic polyacrylamide and modified carbon black: Application as flocculants for oily sludge suspension

Tian

Chen

Liang

et al. 2018

Applied Organom Chemis

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Carbon black was modified using various liquid-phase oxidation methods (modified carbon black = m-CB, m = (1, 2, 3): 1, sulfuric acid/potassium permanganate method; 2, nitric acid method; 3, hydrogen peroxide method). With acetone-ethylene glycol as initiator, dimethyldiallylammonium chloride (DMDAAC) and acrylamide (AM) as monomer, cationic polyacrylamide (CPAM) was prepared by UV excitation of the monomer. The m-CB/CPAM nanocomposites were synthesized using a hydrothermal method. The factors that affected the molecular weight of CPAM were investigated, including the total monomer concentration, the dosage of the complex initiator, the mass ratio of m AM :m DMDAAC and the UV irradiation time. The chemical structures and morphologies of the samples were characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis, elemental composition, X-ray diffraction and scanning electron microscopy. 1-CB/CPAM was utilized to flocculate oil sludge suspension, and the effects of 1-CB quality, 1-CB/CPAM dosage, temperature and pH value on the flocculation performance of 1-CB/ CPAM were investigated. The flocculation mechanism of 1-CB/CPAM was also analyzed. The results show that 1-CB/CPAM has an outstanding flocculation effect, and it flocculates oil sludge particles by adsorption bridging and charge neutralization in acidic and alkaline conditions.

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Section: Resultsmentioning

confidence: 61%

Synthesis of nanocomposites from cationic polyacrylamide and modified carbon black: Application as flocculants for oily sludge suspension

Tian

Chen

Liang

et al. 2018

Applied Organom Chemis

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“…Under the same strain of 45%, the composite gel with 8% nanosilica possessed the stress of 44.6 KPa, which is nearly 10 times higher than the general gel without nanosilica with the stress less than 5 KPa, indicating its excellent mechanical and elasticity strength. The stress-strain performance of this new developed composite gel is better than the nanosilica-based PAM crosslinking chromium acetate nanocomposite gel reported by Sun et al 31,32 After the compress load was released, as it is shown in Figure 4, the general gel (without adding nanosilica) cracked, and there are obvious wide fractures on the bottom, whereas the composite gel with 8% nanosilica is still an undamaged whole with no fractures but a very little shape change. That could be explained as there are more empty space in the general gel network structure, when then general gel was compressed, it is brittle and easy to crack.…”

Section: Stress-strain Performancementioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Environmental and strength‐enhanced nanosilica‐based composite gel for well temporary plugging in high‐temperature reservoirs

Jia

Yang

2018

Asia-Pacific J Chem Eng

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Polymer gel is widely used for well temporary plugging in petroleum engineering. This paper researched on a novel environmental and strength‐enhanced composite gel plug prepared by the nanosilica, the polymer hydrolyzed polyacrylamide and environmental friendly crosslinker polyethyleneimine, and the effect of strength enhancement and thermal stability mechanism of the nanosilica in this system was investigated. The experiments results showed that with the increase of the nanosilica concentration, the elastic modulus and viscous modulus, the stress under the same strain and the gel decompose temperature both increased. For the system containing 8% nanosilica, the elastic modulus is about 14 times than the one without it, whereas the viscous modulus is only 70.98 Pa, which is favorable for lowering the absorption damage to the formation. The strain–stress experiment results showed that to reach 45% strain, the stress of 44.6 KPa needed to be loaded (for composite gel with 8 wt% nanosilica) and during the compress process, the gel deformed with no break and after the stress was released, it got back to the original shape soon, indicating its good mechanical and elasticity performance. The differential scanning calorimetry (DSC) results revealed that the after adding nanosilica, more free water can be kept so that the system's thermal stability was effectively improved. The scanning electron microscopic images displayed that the nanosilica particles closely adhere to the polymer network; thus, the 3D structure of the composite gel became more compact and the gel's strength was improved. In the last section, some recommendations for well temporary plugging are proposed.

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“…Therefore, there is a need for slow swelling rate and good deformability that can overcome blocking near bore and migrate into the deep reservoirs. To improve the mechanical strength of traditional hydrogels, researchers have made efforts to develop chemically modified materials with novel structures, such as topological gels [14], nanocomposite gel [15][16][17][18], double network gel [19], polymer microsphere composite hydrogel [20,21], hydrophobic association hydrogel [22,23], and tetrapolyethylene glycol hydrogel [24].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Hydrophobic-Associated Microspheres for Deep Profile Control in Offshore Oilfields

Jin

et al. 2018

International Journal of Polymer Science

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Microspheres have excellent sealing performances such as injectivity, bridging-off, deep migration, and deformation performances, but their plugging effects are limited by the fast swelling rate and poor viscoelasticity. In this study, we synthesized a novel modified microsphere with polymerizable surfactant monomers and cationic monomers. We investigated the influence factors on the swelling performance and rheological properties of the microspheres and explored the ways to improve the plugging performance of hydrophobic-associating microspheres. The association behaviors in aqueous media of poly(acrylamide-comethacry loyloxyethyl trimethyl ammonium chloride-co-n-dodecyl poly(etheroxy acrylate) P(AM-DMC-DEA) are proven to be mediated by the DEA content. Moreover, the hydrophobic association interaction has a strong effect on the performance of microspheres such as swelling properties, the rheological performance, and plugging properties. The swelling properties of microsphere studies exhibited the slow swelling rate. The rheological performance measurements showed significant improvements; yield stress, and creep compliance increased rapidly from 404 to 2060 Pa and 3.89 × 10 −4 to 1.41 × 10 −2 1/Pa, respectively, with DEA content in microspheres rising from 0.0% to 0.22%. The plugging properties of microspheres were enhanced by the slow swelling performance and good viscoelasticity.

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Nanosilica-induced high mechanical strength of nanocomposite hydrogel for killing fluids

Cited by 45 publications

References 22 publications

Synthesis of nanocomposites from cationic polyacrylamide and modified carbon black: Application as flocculants for oily sludge suspension

Synthesis of nanocomposites from cationic polyacrylamide and modified carbon black: Application as flocculants for oily sludge suspension

Environmental and strength‐enhanced nanosilica‐based composite gel for well temporary plugging in high‐temperature reservoirs

Preparation and Characterization of Hydrophobic-Associated Microspheres for Deep Profile Control in Offshore Oilfields

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