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New insights into the mechanism of surfactant enhanced oil recovery:Micellar solubilization and in-situ emulsification

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Petroleum Science 2022年第2期19卷 870-881页

作者： Xue-Zhi Zhao Guang-Zhi Liao Ling-Yan Gong Huo-Xin Luan Quan-Sheng Chen Wei-Dong Liu Dong Liu Yu-Jun Feng Polymer Research Institute State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu610065People's Republic of China PetroChina Exploration&Production Company Beijing100007People's Republic of China Research Institute of Experiment and Detection Xinjiang Oilfield Branch CompanyPetroChinaKaramay834000People's Republic of China Research Institute of Petroleum Exploration&Development PetroChina Company LimitedBeijing100083People's Republic of China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang621000People's Republic of China

Reducing the oil-water interfacial tension(IFT)to ultra-low is believed the primary mechanism for surfactant-based enhanced oil recovery(EOR)***,field trials have shown that low concentration surfactant flooding can also improve oil recovery without ultra-low *** clarify the mechanism behind,the currently-used surfactant,naphthenic arylsulfonate(NAS),was used to unravel its function during surfactant flooding from the horizon of micron-and *** solubilization capacity of NAS micelle to petroleum fractions was evaluated through light absorbance strategy,smallangle neutron scattering,dynamic light scattering and transmission electron *** was found that micellar solubilization plays a significant role during the surfactant ***-situ emulsification was visualized in microfluidics with three types of microchips,respectively.A series of displacement tests were carried out with NAS solution pumping into oil-saturated *** results show that in-situ emulsification improve oil recovery mainly through blocking and entrainment *** from this work aid in understanding the interaction between surfactant solution and petroleum fractions at low surfactant concentration,which is helpful for design surfactant-based displacing system for EOR process.

关键词： Enhanced oil recovery Surfactant flooding Micellar solubilization Microfluidics in-situ emulsification

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Measurement of Viscosity Alteration for Emulsion and Numerical Simulation on Bitumen Production by SAGD Considering in-situ emulsification

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Journal of Earth Science and Engineering 2016年第1期6卷 10-17页

作者： Junpei Kumasaka Kyuro Sasaki Yuichi Sugail Olalekan S. Alade Masanori Nakano Department of Earth Resources Engineering Kyushu University Fukuoka 819-0395 Japan Research Center Japan Petroleum Exploration Co. Ltd. Chiba 261-0025 Japan

A thermal steam stimulation process, such as steam-assisted gravity drainage （SAGD）, induces water-in-oil emulsion of heavy oil or bitumen throughout the production. The present study investigated the effects of in-situ emulsification in the oil sands reservoir for SAGD process. The viscosities of water-in-oil emulsions produced were measured with respect to water-oil ratio （W/O）, shear rates, pressures and temperatures. The results therefore were employed to develop the numerical model of viscosity alteration. Numerical simulations of the SAGD bitumen production considering viscosity alteration were also carried out to investigate distribution characteristics of emulsion, water, and bitumen at steam chamber boundary and effects of in-situ emulsification on bitumen production behavior. With a model named SAGD-Emulsion Model, it was found that the net recovery factor of bitumen for this model is 5 to 10% higher than that of conventional SAGD simulation. Ultimately, it was found that the recovery factor of bitumen increased with W/O of emulsion generated in the reservoir since higher water content would invariably allow bitumen to flow at higher relative permeability, while the increase in viscosity merely delayed bitumen production.

关键词： Viscosity alteration bitumen emulsion in-situ emulsification SAGD.

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