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AN UNSTEADY SEEPAGE FLOW MODEL OF VISCO-ELASTIC polymer solution

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Journal of Hydrodynamics 2004年第2期16卷 209-215页

作者： YINHong-jun LVYan-ping DepartmentofPetroleumEngineering DaqingPetroleumInstituteDaqing163318Chinae-mail：yinhj7176@sinacom DepartmentofPetroleumEngineering PetroleumUniversityBeijing102200China

With the consideration of the visco―elasticity, the adsorption effect andthe variation of rheological parameters, a seepage flow model of visco-elastic polymer solutions wasestablished. The model was numerically treated with the finite difference method. Then curves ofBottom Hole Pressure (BHP) and formation pressure were drawn. The influences of the relaxation time,the injection rate, the permeability reduction coefficient, the consistency coefficient and thepower-law exponent of the injected fluid on pressure performance were analyzed. This study showsthat it is necessary to consider the visco-elasticity of non-Newtonian fluid in analyzing ofpressure performance in the polymer flooding.

关键词： polymer solution rheological property visco-elasticity seepage flow model

EXPERIMENTAL STUDY OF MICROSCALE FLOW FOR MICRO MOLECULE LIQUID AND polymer solution

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Journal of Hydrodynamics 2005年第3期17卷 352-357页

作者： LIUZhong-chun YUEXiang-an HOUJi-rui ZHANGLi-juan SchoolofEnergyResources ChinaUniversityofGeoscienceBeijing100083China／／SINOPECExplorationandproductionResearchInstituteBeijing100083China EORcenter ChinaUniversityofPetroleumBeijing102249China

The flow performances of water, white oil and Hydrolyzing Polyacrylamide (HPAM) solution in fused quartz channels and the effect of wettability on the microscale flows have been studied respectively in this paper. The adaptability of classical fluid mechanics in channels with different sizes has been discussed. The results show that water flows in channels of 2μm diameter also have few size effects and white oil flow accord with classical fluid mechanics theory in channels of 25μm diameter too, but polymer solution appears an obvious size effect as diameters of channels decrease to 16μm. The wettability does not produce any influences on the water or white oil flows in channels of 25μm or 50μm diameter. The experimental technology of microscale flows has been first applied for studying the flow performances of pores in low permeability reservoir. This study found a base for deep investigating the percolation mechanism in low permeability reservoirs.

关键词： microscale flow wettability micro molecule liquid polymer solution reservoir pores low permeability

A NOVEL INTERPRETATION OF CONCENTRATION DEPENDENCE OF VISCOSITY OF DILUTE polymer solution

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Chinese Journal of polymer Science 2000年第1期18卷 57-67页

作者： Yan Pan Rong-shi Cheng College of Material Science and Engineering, South China University of Technology, Guangzhou 510641, China College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China 华南理工大学广东广州

The concentration dependence of the reduced viscosity of dilute polymer solution is interpreted in the light of a new concept of the self-association of polymer chains in dilute solution. The apparent self-association constant is defined as the molar association constant divided by the molar mass of individual polymer chain and is numerically interconvertible with the Huggins coefficient. The molar association constant is directly proportional to the effective hydrodynamic volume of the polymer chain in solution and is irrespective of the chain architecture. The effective hydrodynamic volume accounts for the non-spherical conformation of a short polymer chain in solution and is a product of a shape factor and hydrodynamic volume. The observed enhancement of Huggins coefficient for short chain and branched polymer is satisfactorily interpreted by the concept of self-association. The concept of self-association allows us to predict the existence of a boundary concentration C-s(dynamic contact concentration) which divides the dilute polymer solution into two regions.

关键词： self-association polymer solution viscosity concentration dependence

EFFECT OF ADSORPTION ON THE VISCOSITY OF DILUTE polymer solution

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Chinese Journal of polymer Science 1999年第1期17卷 27-35页

作者：程鎔时 College of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China College of Material Science and Engineering South China University of Technology Guangzhou 510641 China

Careful measurements of the dilute solution viscosities of polyethylene glycol and polyvinyl alcohol in water were carried out. The reduced viscosities of both polymer solutions plot upward curves at extremely dilute concentration levels similar to the phenomena observed for many polymer solutions in the early 1950's. Upon observation of the changes of the flow times of pure water in and the wall surface wettability of the viscometer after measuring solution viscosity, a view was formed that the observed viscosity abnormality at extremely dilute concentration regions is solely due to the effect of adsorption of polymer chains onto the wall surface of viscometer. A theory of adsorption effect based on the Langmuir isotherms was proposed and a mathematical; analysis for data treatment was performed. The theory could adequately describe the existing viscosity data. It seems necessary to correct the viscosity result of dilute polymer solutions measured by glass capillary viscometer by taking into account the effect of adsorption in all cases.

关键词： adsorption polymer solution solution viscosity

Theoretical analysis of microscopic oil displacement mechanism by viscoelastic polymer solution

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Theoretical & Applied Mechanics Letters 2011年第2期1卷 52-55页

作者： Yuhu Bai,~(1,2,a) Xiansong Zhang,~(1,2)and Guoshi Zhao~3 1.State Key Laboratory of Offshore Oil Exploitation,Beijing 100027,China 2.China National Offshore Oil Corporation Research Institute,Beijing 10027,China 3.No.8 Oil Production Plant,Daqing Oilfield Limited Company,PetroChina,Daqing 163514,china State Key Laboratory of Offshore Oil Exploitation Beijing 100027 China China National Offshore Oil Corporation Research Institute Beijing 10027 China No. 8 Oil Production Plant Daqing Oilfield Limited Company PetroChina Daqing 163514 China

The microscopic oil displacement mechanism in viscoelastic polymer flooding is theoretically analyzed with mechanical method.The effects of viscoelasticity of polymer solution on such three kinds of residual oil as in pore throat,in sudden expansion pore path,and in dead end are analyzed.Results show that the critical radius of mobile residual oil for viscoelastic polymer solution is larger than that for viscous polymer solution,which makes the oil that is immobile in viscous polymer flooding displaced under the condition of viscoelastic polymer solution.The viscous polymer solution hardly displaces the oil in dead ends.However,when the effect of viscoelasticity is considered,the residual oil in sudden expansion pore paths and dead ends can be partly displaced. A dimensionless parameter is suggested to denote the relative dominance of gravity and capillary pressure.The larger the dimensionless parameter,the more accurate the increment expressions.

关键词： polymer solution viscoelasticity residual oil dimensionless parameter

INFLUENCE OF SOLVENT AND polymer SORT ON ANOMALOUS RHEOLOGICAL BEHAVIOR OF polymer solution AT HIGH DILUTION

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2001年第3期 26-31页

作者：钱锦文周国海郑强吴平东 QIAN Jin-Wen (Department of polymer Science and Engineering Zhejiang University Hangzhou 310027 China) ZHOU Guo-hai (Department of Chemical Engineering Zhejiang University Hangzhou 310027 China)

The rheological behavior of polyvinyl acetate (PVAc) in N,N’\|dimethylformamide (DMF), methyl ethyl ketone (MEK), 1,2\|dichloroethane (DCE), tetrahydrofuran (THF) and toluene (TOL), polystyrene (PS) in DMF, MEK, DCE, THF and cyclohexane (CYH), and random ethylene\|vinyl acetate (EVA) copolymer in DCE, TOL, CYH with and without surfactant of Span80 and in the DCE/CYH solvent mixtures with surfactant of Span80 was examined at high dilution. It was shown that the extent and type of the upsweep or downsweep (anomalous rheological behavior) of the reduced viscosity\|concentration curves of these different polymers at high dilution are markedly dependent on the dielectric constant of the solvent and the polarity of the polymer used. The experimental results indicated that the anomalous rheological behavior of EVA copolymer, widely used as a flow improver, is related to its efficiency in reducing viscosity and depressing pour point of crude oil and waxy solvents.

关键词： polyvinyl acetate (PVAc) polystyrene (PS) ethylene\|vinyl acetate (EVA) copolymer rheology polymer solution viscosity

solution PROPERTIES OF LADDER-LIKE polymer POLYPHENYLSILSESQUIOXANES

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Chinese Journal of polymer Science 1987年第4期5卷 359-365页

作者：施良和张心胜史沅东叶美玲李定才 Institute of Chemistry Academia Sinica Beijing

solution properties of ladder-like polymer polyphenylsilsesquioxane （PPS） were studied by measurement of intrinsic viscosity, small angle laser light scattering and gel permeation chromatography. It was found that PPS can be modeled with a wormlike continuous cylinder rather than a wormlike coil. A plot of （M2/[η]）1/3 vs. M1/2 was employed in obtaining the persistence length （2λ）-1 and effective hydrodynamic diameter. When MW≤5×105, Mark-Houwink equation is adequate in describing the relationship between MW and [η] with αabout unity. This implies that PPS chain is semi-stiff. For GPC experiments, it was shown that universal calibration can be applied in PPS. When molecular weights of PPS are sufficiently high, their molecular weight distributions are often very broad.

关键词： polymer solution ladder polymer wormlike cylinder polyphenylsilsesquioxane

Study on the sound absorption mechanism in gradient water-soluble polymer solution

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Chinese Journal of Acoustics 2006年第1期25卷 58-65页

作者： WANG Yuansheng YANG Xue ZHU Jinhua YAO Shuren Administrative Office of Training Naval University of Engineering Wuhan 430033 Institute of polymeric Materials Naval University of Engineering Wuhan 430033

Attention was paid to the study on the sound absorption mechanism of water- soluble polymer during dissolving, A specially designed water-soluble polymer coating was synthesized in our lab. The sound attenuation property was measured in sound tube. The results showed that the sound attenuation of the gradient polymer solution was larger than that of the uniform. Depending on the experimental result and the theory of sound wave propagation in layered medium, a mechanism of gradient water-soluble polymer solution was developed. This mechanism can be described as follows： a water-soluble polymer coating formed a concentration gradient layer when it was dissolved in water, This gradient layer led to multiple reflection and absorption of sound. Finally the sound energy was transferred into heat.

关键词： polymer solution sound attenuation polymer coating concentration gradient watersoluble polymer wave propagation sound absorption sound energy

Flow characteristic of polymer solutions in porous media:Influence of the molecular weight and concentration

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Petroleum 2023年第2期9卷 214-222页

作者： Yingjie Dai Jia Li Li Li Yifei Liu Yuan Li Xiangyu Wang Xuguang Song Caili Dai Bin Yuan Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum East China)Ministry of EducationQingdao 266580China Shandong Key Laboratory of Oilfield Chemistry(China University of Petroleum East China)Qingdao 266580China Nanchong Vocational and Technical College Nanchong 637131China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an 710000China Sinopec Research Institute of Petroleum Engineering Fracturing&Acidizing and Natural Gas Production Research InstituteDongying 257000China Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada

The polymer solution flow in porous media is a central research topic related to hydraulic fracturing measures,formation damage and fracture propagation.Influenced by molecular weights and concentrations,various flow patterns of polymer in pores are presented,resulting in different filtration loss.In this work,the effectiveness of various polymer solutions for filtration loss was assessed by utilizing the core flooding experiment firstly.The result shows that lesser filtration loss normally is inextricably linked to solutions with high molecular weight and concentration.Subsequently,the flow behaviors of polymer solutions investigated by designed micro pore-throat structure and micro-particle image velocimetry(m-PIV)further confirmed the above result.It was found that the central convergent flow pattern benefiting from higher viscous force loss and less filtration loss was observed at high flow rates(0.5 mL/h),and higher molecular weight and concentration were more prone to convergent flow patterns.The viscosity force loss increases by about 4 times varying the molecular weight of polymer from 5×10^(6)to 18×10^(6)g/mol or the concentration from 0.05 to 0.3%.It interprets higher molecular weight and concentration in core studies and field observations with decreased filtration loss of HPAM.This work provides a theoretical foundation for the application of fracturing fluids as well as fresh perspectives on how to access the filtration loss of fracturing fluids.

关键词： polymer solution Porous media Flow pattern m-PIV