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Modeling of kinetic characteristics of alkaline-surfactant-polymer-strengthened foams decay under ultrasonic standing wave

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Petroleum Science 2022年第4期19卷 1825-1839页

作者： Zhi-Hua Wang Xiao-Yu Liu Hong-Qi Zhang Yong Wang Yun-Fei Xu Bao-Liang Peng Yang Liu Key Laboratory for Enhanced Oil&Gas Recovery of the Ministry of Education Northeast Petroleum UniversityDaqingHeilongjiang163318China Oil Recovery Plant No.3 PetroChina Daqing Oilfield Company LimitedDaqingHeilongjiang163113China Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China

Foaming issues are encountered at the stages in crude oil production, transportation, processing, especially in chemical flooding enhanced oil recovery(EOR) oilfields. These accumulated foams would cause a lot of trouble for downstream operation. The destruction of foams under ultrasonic has been increasingly paying attention in the background of green oilfield development. This study focuses on the decay kinetic characteristics of alkaline-surfactant-polymer-strengthened foams under the ultrasonic standing wave.The performance of the diverse foams was characterized. A decay kinetic model incorporating the energy correlation was developed and validated. The factors that affect the decay kinetic characteristics were discussed. The results indicated that the collapse rate and the collapse volume fraction decreased when the foam size decreased, the gas-liquid ratio decreased and the surface tension increased. Ultrasonic standing wave parameters have a significant impact on the decay behavior of the foam. Both the ultrasonic frequency and ultrasonic amplitude were increased by 50%, the collapse volume fraction of foams increased by about 1.25 times in the identical irradiation time. The relative deviation between the measured results and the model prediction was less than 10%. The potential collapse mechanism was also explained using the principle of energy correlation of foam surface. This study is not only beneficial to provide a robust and rigorous way to defoam of produced liquid in the alkaline/surfactant/polymer(asp)flooding EOR process but also meaningful to well understand the decay process of oil-based foams.

关键词： Foaming performance Energy correlation model Decay kinetic Collapse mechanism asp flooding Ultrasonic standing wave

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Effect of heterogeneity and injection rates on the recovery of oil from conventional sand packs:A simulation approach

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Petroleum Research 2023年第1期8卷 96-102页

作者： Anurag Pandey Himanshu Kesarwani Amit Saxena Reza Azin Shivanjali Sharma Department of Petroleum Engineering and Geological Sciences Rajiv Gandhi Institute of Petroleum TechnologyIndia Department of Petroleum Engineering Faculty of PetroleumGas and Petrochemical EngineeringPersian Gulf UniversityBushehrIran

The study of flow through porous media has been of cardinal gravity in oil and gas applications like enhanced oil recovery(EOR),acidizing,fracturing,etc.One of the most anticipated apprehensions is that the core flooding and simulation have become prevalent to understand the flow through porous media.This study aims at simulating and analyzing the effect of alkaline surfactant flooding through heterogeneous permeability conditions in the lab-scale methods.The conventional methods of core flood deal with the effective permeability of the system without considering the effect of heterogeneity within the core.The heterogeneous studies are conducted by simulating a finely meshed 2-D axisymmetric model of the sand pack.The novel Karanj oil surfactant extracted from Pongamia Pinnata,and partially hydrolyzed polyacryl amide polymer are considered for the physicochemical properties of displacing fluid used in the simulations.Different heterogeneity combinations and displacing fluid injection flow rates are introduced for a single absolute permeability system.Results indicate a trend of oil recovery upright with increasing vertical permeability.A lower areal sweep efficiency and early breakthrough are observed in models with high horizontal permeabilities.Further,the effect of heterogeneity on oil recovery is reduced with the increase in injection flow rates of displacing fluid.The present work utilizes computational fluid dynamics to model multiphase flow through a heterogeneous permeability media and its effect on oil recovery.

关键词： Karanj oil Simulation Enhanced oil recovery(EOR) Heterogenous permeability asp flooding

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Residual oil evolution based on displacement characteristic curve

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International Journal of Mining Science and Technology 2020年第3期30卷 337-343页

作者： Duanchuan Lyu Chengyan Lin Lihua Ren Chunmei Dong Jinpeng Song School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Exploration Department of Tarim Oilfield Company PetroChinaKorlaXinjiang 841000China

The purpose of this study was to determine the displacement and dynamic distribution characteristics of the remaining oil in the two development stages of water flooding and subsequent alkaline surfactant polymer(asp) flooding. The well pattern types in the water and asp flooding stages are a longdistance determinant well pattern and short-distance five-point well pattern, respectively. The type A displacement characteristic curve can be obtained using the production data, and the slope of the straight-line section of the curve can reflect the displacement strength of the oil displacement agent. A numerical simulation was carried out based on the geological model. The results revealed that the injected water advances steadily with a large-distance determinant water-flooding well pattern. The single-well water production rate increases monotonically during water flooding. There is a significant positive correlation between the cumulative water-oil ratio and the formation parameter. Differential seepage between the oil and water phases is the main factor causing residual oil formation after water flooding, while the residual oil is still relatively concentrated. The effect of the chemical oildisplacement agent on improving the oil-water two-phase seepage flow has distinct stages during asp flooding. The remaining oil production is extremely sporadic after asp flooding.

关键词： Water flooding asp flooding Water-drive characteristic curve Residue oil Thick oil layer

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