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Flow characteristics and regime transition of aqueous foams in porous media over a wide range of quality,velocity,and surfactant concentration

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Petroleum Science 2023年第2期20卷 1044-1052页

作者： Bin-Fei Li Meng-Yuan Zhang Zhao-Min Li Anthony Kovscek Yan Xin Bo-Liang Li Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China Department of Energy Resources Engineering Stanford UniversityStanfordCA94305USA

Aqueous foam is broadly applicable to enhanced oil recovery(EOR).The rheology of foam as a function of foam quality,gas and liquid velocities,and surfactant concentration constitute the foundation of its *** great variations of the above factors can affect the effectiveness of N2 foam in EOR continuously in complex formations,which is rarely involved in previous relevant *** paper presents an experimental study of foam flow in porous media by injecting pre-generated N2 foam into a sand pack under the conditions of considering a wide range of gas and liquid velocities and surfactant *** results show that in a wide range of gas and liquid velocities,the pressure gradient contours are L-shaped near the coordinate axes,but V-shaped in other *** the surfactant concentration is a strong factor influencing the trend of pressure gradient *** flow resistance is very sensitive to the surfactant concentration in both the high-and low-foam quality regime,especially when the surfactant concentration is less than *** foam quality is an important variable to the flow resistance *** exists a transition point from low-to high-quality regime in a particular flow system,where has the maximum flow resistance,the corresponding foam quality is called transition foam quality,which increases as the surfactant concentration *** results can add to our knowledge base of foam rheology in porous media,and can provide a strong basis for the field application of foams.

关键词： Foam flow regime and transition Porous media Pressure gradient Flow velocity surfactant concentration Foam quality

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Surface nanobubbles on the hydrophobic surface and their implication to flotation

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1493-1501页

作者： Chenwei Li Danlong Li Xin Li Ming Xu Haijun Zhang School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China Helmholtz Institute Freiberg for Resource Technology Helmholtz-Zentrum Dresden-RossendorfChemnitzer Straße 4009599 FreibergGermany

Nanobubbles play a potential role in the application of the flotation of fine *** this work,the identification of nanoentities was performed with a contact mode atomic force microscope(AFM).Moreover,the influences of setpoint ratio and amplitude of the cantilever and the responses of the formed surface nanobubbles to the fluctuation of pH,salt concentration,and surfactant concentration in the slurry were respectively *** were reported on the highly oriented pyrolytic graphite(HOPG)surface as the HOPG was immersed in de-ionized water under ambient *** coalescence of nanobubbles occurred under contact mode,which provides strong evidence of the gaseous nature of these nanostructures on *** measuring height of the surface nanobubbles decreased with the setpoint *** changes in the pH and concentration of methyl isobutyl carbinol(MIBC)show a negligible influence on the lateral size and height of the preex-isting surface *** addition of LiCl results in a negligible change of the lateral size;however,an obvious change is noticed in the height of surface *** results are expected to provide a valuable reference in understanding the properties of surface nanobubbles and in the design of nanobubble-assisted flotation processes.

关键词： surface nanobubbles flotation pH salt concentration surfactant concentration

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Supplement and optimization of classical capillary number experimental curve for enhanced oil recovery by combination flooding

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Science China(Technological Sciences) 2014年第11期57卷 2190-2203页

作者： QI LianQing LIU ZongZhao YANG ChengZhi YIN YanJun HOU JiRui ZHANG Jian HUANG Bo SHI FengGang CNOOC EnerTech-Drilling & Production Co. China United Coalbed Methane Corporation Ltd. CNPC Research Institute of Exploration and Development Enhanced Oil Recovery Institute of China University of Petroleum CNOOC Research Institute

In the middle of the last century,American scientists put forward the concept of capillary number and obtained the relation curve between capillary number and residual oil through *** revealed that the corresponding residual oil saturation decreased with increasing of capillary number;after capillary number reached up to a limit,residual oil saturation would become stable and did not *** important achievements laid a theoretical base for enhanced oil recovery with chemical *** the basis of the theory,scholars developed chemical flooding numerical simulation software *** the numerical simulation study of combination flooding,the authors found that as the capillary number is higher than the limit capillary number,the changes of the residual oil saturation along with the capillary number differ from the classical capillary number *** displacement experiments prove that there are defects in classic capillary number experimental curve and it is necessary to mend and *** number‘calculation’curve is obtained with a method of numerical simulation calculation and a complete description of capillary number curve is provided;On this basis,combination flooding capillary number experimental curve QL is obtained through experiments,which is different from the classical capillary curve;and based on which,an expression of corresponding combination flooding relative permeability curve QL is given and the corresponding relative permeability parameters are determined with *** oil displacement experiment research recognizes the cause of the singular changes of the capillary number curve."Combination flooding capillary number experimental curve QL"and"combination flooding relative permeability curve QL"are written in combination flooding software IMCFS,providing an effective technical support for the application of combination flooding technical research.

关键词： numerical simulation driving conditions interfacial tension capillary number combination flooding surfactant concentration wettability conversion

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Study on Optimization of Polymer Enhanced Foam Formulation System

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Engineering（科研） 2023年第11期15卷 742-748页

作者： Meinan Wang Yuejie Wang Hongyou Zhang Xiaoyan Yang Xiaoming Chen Bohai Oilfield Research Institute of CNOOC Ltd.—Tianjin Branch Tang Gu Tianjin China

Taking the pilot test area of polymer enhanced foam flooding in Y oilfield as the prototype, a numerical core model was established, and the polymer enhanced foam formulation system was optimized by analyzing the resistance factor and the change rule of oil recovery of different formulation systems. Research shows that the higher the polymer concentration, the greater the resistance factor, and the more obvious the sealing effect formed in the formation. The concentration of surfactant has a greater impact on the resistance factor. With the increase of surfactant concentration, the resistance factor increases significantly, and the plugging effect of foam agent on core is significantly enhanced. With the increase of gas-liquid ratio, the resistance factor first increases and then decreases. When the gas-liquid ratio is 1:1, the resistance is the largest, and the foam agent has the strongest plugging effect on the core. The optimal formula system of polymer enhanced foam flooding in Y oilfield is: polymer concentration is 1200 mg/L, surfactant concentration is 0.25 wt%, gas-liquid ratio is 1:1.

关键词： Enhanced Foam Polymer concentration surfactant concentration Gas-Liquid Ratio

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