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Experimental investigation of viscoelastic polymers for stabilizing foam
Wan-Fen Pu,PENGWEI,Lin Sun,Fa-yang Jin,Song Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Foam stability can be significantly improved by adding a polymer in foam system, mainly due to thereduction of liquid drainage and the enhancement of interfacial adsorption behavior. In this paper, wecombined rheological properties with surface properties to investigate the effect of different polymers onthe stability of polymer enhanced foam, and then analyzed the foam stability from microscopicviewpoint. From the results, the liquid drainage of polymer enhanced foam was highly depending on thesolution viscosity with a high shear-rate (200 s 1) instead of the initial thickening ability of polymer, andthe stability of liquidfilms was improved by increasing solution elasticity or interfacial viscoelasticity orby reducing surface tension. Finally, the micro-experiment revealed that the XG (xanthan gum) enhancedfoam possessed the dense and uniform gas bubbles and the thick and multi-layered liquidfilms, whichcontributes to the reduction of coalescence and the increase offilm strength.
Amphiphilically modified chitosan copolymer for enhanced oil recovery in harsh reservoir condition
Wan-Fen Pu,Rui Liu,Qin Peng,Dai-Jun Du,Qi-Ning Zhao 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
A novel amphiphilically grafting natural chitosan copolymer (PAMCS) was prepared by using one stepwater-free radical polymerization strategy and the basic parameters for PAMCS were systematicallycharacterized. The rigid D-glucosamine unit, intermolecular association and hydrogen bondingsynergistically endowed PAMCS solution with rheological properties, super-high salt resistance andtemperature tolerance in harsh reservoir condition. PAMCS solution exhibited viscoelastic behaviorand formulated the unique displacement mechanism in comparison to that for partially hydrolyzedpolyacrylamide. Moreover, the mass concentration, injective rate and polymer solution slug related to oilrecovery efficiency for PAMCS were investigated from the economic point.
Rui Liu,Wan-Fen Pu,Dai-Jun Du 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
A novel core–shell polymer (HBAPAM) with functionalized nano-SiO2 as core, multibranched associativepolymeric chains as shell was synthesized through in-situ free radical polymerization strategy. TGA, IR,1H NMR, and SEM proved the notion and method of preparing of HBAPAM was applicable. The core–shellstructure and multibranched morphology enhanced the supramolecular interaction of HBAPAM, whichdisplayed the desirable viscosified efficiency and viscoelasticity, especially, long-term stability in harshtemperature and salinity condition. HBAPAM featured the rheology in multiscale consistently indeionized water and formation water. Coreflooding experiments confirmed that HBAPAM had high costperformance in the variable permeability of oilfields.
Role of water-soluble polymer on foam-injection process for enhancing oil recovery
Peng Wei,Wan-Fen Pu,Lin Sun,Yong Pu,Daibo Li,Ying Chen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
Role of polymer on foam transportation in porous media is still not entirely illustrated. In this study, we performed the foam injection process in cores and the parallel-layered micromodel, respectively. Combined with a series of static investigations, we found that adding polymer to foam could not only effectively generate a viscous force, but also create a protective enclosure around the bubble (i.e., viscoelastic film). This synergistic effect was supposed to increase the foam apparent viscosity, promote the foam strength in the low-quality regime, create the shear-thickening behavior, and restraint the defoaming effect of crude oil. The microflow experiments indicated that polymer-enhanced foam was capable of sharply increasing the sweep efficiency and EOR. Meanwhile, the presence of viscoelastic liquid films contributed to the microflow behaviors.
Peng Wei,Wan-Fen Pu,Lin Sun,Daibo Li,Xudong Ji 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
APG can be employed as a promising foaming agent due to its largely independent of temperature and salinity. Aiming at the APGs foam, we conducted the experiments about adsorption behaviors, surface viscoelasticity, bulk foam properties and core flooding under conditions of high-temperature and -salinity. Our results demonstrated that APG (n = 10) foam presents a good foam performance and foam properties are highly depended on the surface viscoelasticity and are not completely determined by the adsorbing capacity at the interface of gas–water. In the porous media, an appropriate foam quality of APG foam is contributed to increase the foam strength and gas trapping.
Low temperature oxidation characteristics analysis of ultra-heavy oil by thermal methods
Yi-Bo Li,Ya-Fei Chen,Wan-Fen Pu,Hong Dong,Hao Gao,Fa-yang Jin,Bing Wei 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.48 No.-
To study the oxidation behavior of heavy oils, low temperature oxidation experiments under differentialtemperature and pressure conditions were carried out for both heavy oils (ordinary heavy and ultraheavyoils) with thermogravimetry (TG–DTG)/differential scanning calorimeter (DSC) analyses. And theresults indicated that the differences of physical properties and oxidation reactions for the heavy oilsascribe to the SARA compositions, H/C ratio and specific oxidation path. Owing to the asphaltenescontent, the ultra-heavy oil after the oxidation has more obvious coke deposition with lower activationenergy demand to make it possible for the in-situ combustion without combustion adjuvants.
Fa-yang Jin,Song Wang,Wan-Fen Pu,Cheng-dong Yuan,Lei Wang,Ke-xing Li,Can Gong 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
Emulsified oil foam was investigated to improve the flowability of heavy oil under high salinityenvironment of 23 104 mg/L. Sixteen foaming agents were used to determine an applicableformulation. The factors affecting the formation and stability of the emulsified oil foam were evaluated,including oil viscosity, oil–water ratio, foaming agent concentration, stirring rate and time, andtemperature. The microgram of emulsified oil foam was analyzed by polarizing microscope. The resultsshowed that stable pseudo-emulsion film was built. The considerable dynamic viscosity-reducing ratesin different depth in wellbore were obtained according to pressure differential method in long tubephysical simulation experiments.