FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Yang Liu,Zhengnan Sun,Guolin Jing,Shuo Liu,Yihai Yang,Jianqi Xu
The alkali-catalyzed alcoholysis of polyethylene vinyl acetate (EVA) was used to obtain the product ethylene-vinyl alcohol copolymer (EVAL), and the grafting product poly(ethylene-vinyl alcohol)-graphene oxide (EVAL-GO) was prepared in the form of chemical grafting by utilization of the groups on the surface of GO and EVAL through the esterification reaction. The products were analyzed by Fourier transform infrared (FTIR), 1 H nuclear magnetic resonance (NMR) and Thermogravimetric (TG). The rheological properties of the oil sample and changes in the morphology of wax crystals were characterized by Advanced Hybrid Rheometer and polarized optical microscopy (POM) respectively. The degree of alcoholysis of EVAL reached 74.51%, and the grafting rate of EVAL-GO (0.5%) was 36.18%. Reduction of pour point and gel point of nanocomposite treated crude oil was 12 °C and 4 °C from undoped crude oil at the optimum additive concentration of 1000 mg/kg. Moreover, it decreased the viscosity and yield value of virgin crude oil by 99.5% and 78.3%, respectively. From the morphological analysis, it was indicated that EVAL-GO could make the wax crystals form sphere-like crystals, and the increased void space promoting more liquid oil to be released thus significantly improving the low-temperature fluidity of Daqing waxy crude oil.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Hailin Yu,Zhengnan Sun,Guolin Jing,Zhiwei Zhen,Yang Liu,Kai Guo
Nanocomposite pour point depressants (PPDs) provide a new way to further improve the fluidity of waxy crude oil at low temperatures, which has important application values in pipeline transportation. In this work, the effect of ethylene-vinyl acetate (EVA) doped with magnetic spherical nanoparticles of Fe3O4 (30 nm) on the morphology of wax crystals and the flow behavior of Daqing crude oil was investigated by polarized optical microscopy and rheological testing. The results showed that, compared to the EVA PPD doped with spherical nano-SiO2 (with the same size), the EVA (VA = 28%)/Fe3O4 nanocomposite PPD caused Daqing crude oil to have a more compact and regular wax crystal structure and a weaker gel structure because of the synergistic effect of magnetic materials and heterogeneous nucleation. This study examines the mechanism of nanocomposite PPDs and provides a new perspective for the development of new nanohybrid PPDs.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2021
·
IF 2.262
Jing Zhang,Hailin Yu,Yu Liang,Zhengnan Sun,Yang Liu,Guolin Jing
In this paper, the organic nano-sepiolite was modified to obtain highly dispersibility in the oil phase, and then, EVA (ethylene-vinyl acetate)/nano-sepiolite was prepared by melt blending. The effects of un-doped/doped different NPPDs oil samples on the pour point, gel point, viscosity, and yield value of Daqing crude oil were evaluated. The changes of wax crystal morphology at low temperature were observed by polarizing optical microscopy (POM). The results show that due to the heterogeneous nucleation mechanism and high dispersion in the oil phase, EVA/nano-sepiolite has a better effect on reducing pour point and makes EVA have a higher local concentration in the oil phase, which weakens the wax crystal structure, and greatly improved the low temperature rheology of Daqing crude oil. Compared with pure EVA, EVA/nano-sepiolite can further reduce the pour point, gel point, viscosity, and yield value of Daqing crude oil at the optimum additive concentration of 200 ppm. Among them, it can further reduce the pour point 2 °C and further reduce the gel point 0.93 °C; at 15 °C, the viscosity reduction rate was 20% and the yield value at 15 °C was reduced by 82%.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2010
·Vol. 14
·期 3
·317-324
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IF 0.795
Cui Zheng-gang,Song Hong-xing,Yu Jun-jie,Jiang Jian-zhong,Wang Feng
Alkali-surfactant-polymer (ASP) flooding has been considered to be one of the useful tertiary oil recovery techniques. However, field tests in China have revealed that serious side effects may occur due to using alkali. Thus alkali-free SP flooding is more favorable in China. Unfortunately, surfactants effective in ASP flooding are usually ineffective in the absence of alkali and new surfactants need to be designed. In this paper N -(3-Oxapropanoxyl)dodecanamide as a pure compound and a mixture of homologues with narrow EO number distribution, synthesized by the reaction of lauroyl chloride with diglycolamine and addition of one ethylene oxide to coconut monoethanolamide respectively, are examined for their adaptability in SP flooding. It is found that, when mixed with betaines, both products can reduce Daqing crude oil/connate water interfacial tension to a magnitude of 10 −3 –10 −4 mNm −1 at 45 °C in a wide surfactant concentration range, 0.01–0.5 wt%, and oil displacement tests using natural cores indicates that a tertiary oil recovery of 18.6 ± 0.4% OOIP can be achieved by SP flooding with the N -(3-Oxapropanoxyl)dodecanamide as the main surfactant without adding any alkaline agent and neutral electrolyte. N -(3-Oxapropanoxyl)dodecanamide, as a nonionic surfactant without a cloud point and producible industrially from renewable materials, is an ideal surfactant for SP flooding in the absence of an alkaline agent.
研究领域:
石油工程
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2018
·Vol. 22
·期 1
·47-60
·
IF 1.454
Limin Yan,Ji Ma,Zhenggang Cui,Jianzhong Jiang,Binglei Song,Xiaomei Pei
A new series of sulfobetaine surfactants with double-chain single-head structure were derived from 1,3-dialkyl glyceryl ethers and their performances in reducing Daqing crude oil/connate water interfacial tension (IFT) in the absence of alkali were studied. With a large hydrophilic head group and double hydrophobic chains, these surfactants are efficient at reducing crude oil/connate water IFT. Those with didecyl and dioctyl are good hydrophobic surfactants that can reduce Daqing crude oil/connate water to ultra-low IFT by mixing with a small molar fraction of various conventional single-chain hydrophilic surfactants, such as α-olefin sulfonates, dodecyl polyoxyethylene (10) ether, and cetyl dimethyl hydroxypropyl sulfobetaine. The asymmetric double-chain sulfobetaine derived from 1-decyl-3-hexyl glyceryl ether can reduce Daqing crude oil/connate water IFT to ultra-low solely over a wide concentration range (0.03–10 mM or 0.0017–0.58 wt.%), which allows for use of an individual surfactant instead of mixed surfactants to avoid chromatographic separation in the reservoir. In addition, formulations rich in sulfobetaine surfactants show low adsorption on sandstone, keeping the negatively charged solid surface water-wet, and forming crude oil-in-water emulsions. These new sulfobetaine surfactants are, therefore, good candidates for surfactant-polymer flooding free of alkali. Graphical
研究领域:
石油化学
·
界面科学
·
采油工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.454
Ji Ma,Li-min Yan,Zheng-gang Cui,Jian-zhong Jiang,Xiao-mei Pei,Bing-lei Song
A new zwitterionic surfactant with double long alkyl chains, 3-((3-((1,3-bis (decyloxyl) propane-2-yl) oxy) -2-hydroxypropyl) dimethylamonio) -2-hydroxypropane-1-sulfonate (diC10GE-HSB), was synthesized, and its performances in Surfactant-Polymer (SP) flooding were studied. As a hydrophobic surfactant diC10GE-HSB solely cannot reduce Daqing crude oil/connate water IFT to ultralow, but ultralow IFT can be achieved by using binary mixtures of diC10GE-HSB with various conventional hydrophilic surfactants such as α–olefin sulfonates, dodecyl polyoxyethylene (10) ether, and cetyl dimethyl hydroxypropyl sulfobetaine, over a wide total concentration range (0.625 ∼ 10 mM) at reservoir temperature. This new sulfobetaine surfactant is therefore a good candidate for SP flooding free of alkali.
研究领域:
化学工程
·
石油工程
·
表面活性剂科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）