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Petroleum Science 2021年第1期18卷 123-135页

作者： Mustafa Almahfood baojun bai Missouri University of Science and Technology RollaMO 65401USA EXPEC Advanced Research Center Saudi AramcoDhahranSaudi Arabia

The characterization and enhanced oil recovery mechanisms of a nanosized polymeric cross-linked gel are presented herein.A negatively charged nanogel was synthesized using a typical free radical suspension polymerization process by employing 2-acrylamido 2-methyl propane sulfonic acid *** synthesized nanogel showed a narrow size distribution with one peak pointing to a predominant homogeneous droplet *** charged nanogels were also able to adsorb at the oil-water interfaces to reduce interfacial tension and stabilize oil-in-water emulsions,which ultimately improved the recovered oil from hydrocarbon *** addition,a fixed concentration of negatively charged surfactant(sodium dodecyl sulfate or SDS)was combined with different concentrations of the *** effect of the nanogels combined with surfactant on sandstone core plugs was examined by running a series of core flooding experiments using multiple flow *** results show that combining nanogel and SDS was able to reduce the interfacial tension to a value of 6 Nm/*** core flooding experiments suggest the ability of the nanogel,both alone and combined with SDS,to improve the oil recovery by a factor of 15%after initial seawater flooding.

关键词： Nanogel Polymeric nanogel Enhanced oil recovery

A comprehensive review of in-situ polymer gel simulation for conformance control

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Petroleum Science 2022年第1期19卷 189-202页

作者： baojun bai Jianqiao Leng Mingzhen Wei Missouri University of Science and Technology Rolla65409USA

Gel treatment has been widely applied in mature oilfields to improve sweep efficiency and control water *** numerical simulation is of major importance to the optimization design and prediction of a successful gel ***,there exist many problems in current simulation studies in published *** paper first presents a comprehensive review on the major factors that have been considered at different gelation stages during gel treatment,the models used in the commercial/inhouse simulators,and current numerical simulation studies on both laboratory and field *** we classify the current in-situ gel numerical simulation problems as 1,deficient model problem that has published numerical model but has not been applied in simulator and application studies;2,missing model problem that does not have published quantitative model;and 3,inaccurate application problem that does not consider the major factors of gel performance,based on the reasons from some questionable results of current simulation ***,we point out the major research efforts that should be made in the future to better simulate in-situ gel treatment *** review indicates that numerous simulation studies using commercial software packages intend to predigest the gel treatment,many of which,however,ignore important mechanisms and mislead the operation of gel *** fact,a full assessment of simulating in-situ gels cannot be achieved unless the quantitative models can be qualified in terms of transport and plugging mechanisms based on the experimental results.

关键词： In-situ gel Mechanism Simulation model Application studies

Influence of strong preformed particle gels on low permeable formations in mature reservoirs

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Petroleum Science 2016年第1期13卷 77-90页

作者： Mahmoud O.Elsharafi baojun bai Mc Coy School of Engineering Midwestern State University Department of Geological Sciences & Engineering Missouri University of Science and Technology

In mature reservoirs,the success of preformed particle gel（PPG） treatment rests primarily on the ability of the PPG to reduce and/or plug the high permeable formations,but not damage the low permeable *** test models（filtration test model and pressure test model）were used to determine the effect of PPG on low permeable *** work used a strong preformed particle gel,Daqing（DQ） gel made by a Chinese *** particle gel sizes were ranged from 30 to 120 mesh for this *** are sized in a millimeter or micrometer,which can absorb over a hundred times their weight in *** gel strength was approximately 6500 Pa for a completely swollen PPG with 1 %（weight percentage） NaCl solution（brine）.0.05 %,1 %,and 10 % NaCl solutions were used in *** core permeability was measured before and after PPG *** relationship between cumulative filtration volumes versus filtration times was *** results indicate that DQ gels of a particle size of 30–80 mesh did not damage the cores of a low permeability of 3–25 m *** DQ gels of a smaller particle size ranging from 100 to 120 mesh damaged the core and a cake was formed on the core *** results also indicate that more damage occurred when a high load pressure（400 psi） was applied on the high permeability cores（290–310 m D）.The penetration of the particle gelsinto the low permeable formations can be decreased by the best selection of gel types,particle sizes,and brine concentrations.

关键词： formations reservoirs mature permeability sandstone permeable filtration rock sizes porosity

Characteristics of CO_2 sequestration in saline aquifers

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Petroleum Science 2010年第1期7卷 83-92页

作者： Yang Fang bai baojun Tang Dazhen Shari Dunn-Norman David Wronkiewicz School of Energy Resources China University of Geosciences Beijing 100083 China Department of Geological Sciences and Engineering Missouri University of Science and Technology Rolla MO 65401USA

Storage of CO2 in saline aquifers is a viable option for reducing the amount of CO2 released to the atmosphere. This paper provides an overall review of CO2 sequestration in saline aquifers. First, the principles of CO2 sequestration are presented, including CO2 phase behavior, CO2-water-rock interaction, and CO2 trapping mechanisms. Then storage capacity and CO2 injectivity are discussed as the main determinants of the storage potential of saline aquifers. Next, a site section process is addressed considering basin characteristics, reservoir characteristics, and economic and social concerns. Three main procedures are then presented to investigate the suitability of a site for CO2 sequestration, including site screening, detailed site characterization, and pilot field-scale test. The methods for these procedures are also presented, such as traditional site characterization methods, laboratory experiments, and numerical simulation. Finally, some operational aspects of sequestration are discussed, including well type, injection rate, CO2 purity, and injection strategy.

关键词： CO2 sequestration saline aquifer site selection screening criteria geological storage storage capacity

Surfactant induced reservoir wettability alteration:Recent theoretical and experimental advances in enhanced oil recovery

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Petroleum Science 2011年第4期8卷 463-476页

作者： Wang Yefei XU Huaimin Yu Weizhao bai baojun Song Xinwang Zhang Jichao College of Geosciences China University of Petroleum Beijing 102249 China College of Petroleum Engineering China University of Petroleum Qingdao Shandong 266555 China Department of Geological Science ＆ Engineering Missouri University of Science ＆ Technology RoUa 65409-0410 USA Geological and Scientific Research Institute SINOPEC Shengli Oilfield Company Dongying Shandong 257015 China

Reservoir wettability plays an important role in various oil recovery *** origin and evolution of reservoir wettability were critically reviewed to better understand the complexity of wettability due to interactions in crude oil-brine-rock system,with introduction of different wetting states and their influence on fluid distribution in pore *** effect of wettability on oil recovery of waterflooding was then summarized from past and recent research to emphasize the importance of wettability in oil displacement by *** mechanism of wettability alteration by different surfactants in both carbonate and sandstone reservoirs was analyzed,concerning their distinct surface chemistry,and different interaction patterns of surfactants with components on rock *** concerns such as the combined effect of wettability alteration and interfacial tension （IFT） reduction on the imbibition process was also taken into ***,surfactant induced wettability alteration for enhanced oil recovery is still in the stage of laboratory *** successful application of this technique relies on a comprehensive survey of target reservoir conditions,and could be expected especially in low permeability fractured reservoirs and forced imbibition process.

关键词： Wettability alteration reservoir enhanced oil recovery (EOR) surfactant

New Development Technology Brings Oilfields Benefits

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China Oil & Gas 2001年第4期8卷 38-39页

作者： bai baojun China University of Geoscience Beijing

Most oil fields in China are found in continantal sedimentary basin. In the absence of active aquifer, such fields are developed by water injection at the early development ***, serious vertical and lateral heterogeneity in formation has resulted in a rapid increase in the water cut of oil wells. Research Institute of Petroleum Exploration and Development under PetroChina has recently developed a kind of pre-gelled (PG) particles that can swell in water to control water production in high salinity and high temperature reservoirs. Laboratory study and field application results show that those PG particles can improve conformance control of injected water.

关键词： New Development Technology Brings Oilfields Benefits than high

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国内外水平井控水技术研究现状

石油勘探与开发 2017年第6期44卷 967-973页

作者：孙昕迪白宝君 Missouri University of Science and Technology Rolla Missouri65401USA

分析了国内外水平井控水技术研究现状,介绍了水平井中常用的控水技术,总结了针对不同完井方式水平井的控水方法。控水方法大体上可分为两类,即机械方法和化学方法,两类方法可单独使用或组合使用。机械方法通常用于井筒或近井堵水,化学... 详细信息

分析了国内外水平井控水技术研究现状,介绍了水平井中常用的控水技术,总结了针对不同完井方式水平井的控水方法。控水方法大体上可分为两类,即机械方法和化学方法,两类方法可单独使用或组合使用。机械方法通常用于井筒或近井堵水,化学方法可用于封堵基质孔隙或裂缝。在设计堵水方案时应考虑井筒的完井方式,机械方法和化学方法均可用于裸眼完井及套管射孔完井的水平井;割缝衬管完井及防砂筛管完井只能选择化学方法进行堵水,机械方法只能提供临时的区域分隔。机械方法成本略高于化学方法,且堵水过程中的深度校正也是一个操作难点。当出水点在水平井趾端时,机械或化学方法均可单独使用;当出水点靠近跟端或在水平井段时,则需使用封隔工具进行层位封隔及目标层封堵。

关键词：水平井控水技术机械堵水化学堵水

聚丙烯酰胺类聚合物凝胶改善水驱波及技术现状及展望

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石油勘探与开发 2015年第4期42卷 481-487页

作者：白宝君周佳印鸣飞 MissouriUniversityofScienceandTechnology BASFCorporation

聚合物凝胶体系已广泛应用于国内外各大油田,其主要作用是通过扩大注入水波及体积进而达到稳油降水的目的。按照组成成分和应用条件,聚丙烯酰胺类聚合物凝胶体系主要分为单体凝胶、聚合物凝胶和预交联凝胶3种。最早使用的地下单体凝胶... 详细信息

聚合物凝胶体系已广泛应用于国内外各大油田,其主要作用是通过扩大注入水波及体积进而达到稳油降水的目的。按照组成成分和应用条件,聚丙烯酰胺类聚合物凝胶体系主要分为单体凝胶、聚合物凝胶和预交联凝胶3种。最早使用的地下单体凝胶聚合堵水调剖剂为丙烯酰胺;传统的地下交联聚合物凝胶技术包括金属交联聚丙烯酰胺本体胶和有机交联聚丙烯酰胺本体胶;预交联凝胶体系包括预交联凝胶颗粒、微凝胶及透明水。基于对三大凝胶体系成分及应用条件的分析,提出未来新型凝胶研究应加强深部液流转向用凝胶的开发及应用于恶劣油藏环境凝胶的研制。

关键词：聚丙烯酰胺单体凝胶聚合物凝胶预交联凝胶堵水调剖深部液流转向提高采收率

加拿大魁北克省奥陶系Utica页岩岩石物理特性

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石油勘探与开发 2016年第1期43卷 69-76页

作者：白宝君孙永鹏刘凌波 Missouri University of Science and Technology 中国石油大学(华东)

利用x射线衍射（XRD）矿物分析、x射线能量色散光谱分析（EDS）、扫描电镜（SEM）、聚焦离子束扫描电镜（FIB-SEM）等手段，对加拿大魁北克省奥陶系Utica页岩矿物成分、孔隙度、微观孔隙结构、表面润湿性等岩石物理特性进行了研究。压... 详细信息

利用x射线衍射（XRD）矿物分析、x射线能量色散光谱分析（EDS）、扫描电镜（SEM）、聚焦离子束扫描电镜（FIB-SEM）等手段，对加拿大魁北克省奥陶系Utica页岩矿物成分、孔隙度、微观孔隙结构、表面润湿性等岩石物理特性进行了研究。压汞仪测试结果显示测试样品的孔隙直径在15-200nm；XRD矿物分析和EDS元素测试显示Utica页岩中的非黏土矿物以方解石和石英为主，黏土矿物以伊利石和绿泥石为主；利用SEM对岩心表面孔喉进行了观测，图像显示Utica页岩中发育多种类型的孔隙，比如粒内孔、粒间孔、有机质孔等，其中，有机物（干酪根）中的孔隙在纳米级别（10～50nm）；利用FIB—SEM完成了250张扫描电镜图像，利用这些图像重建了三维层析成像模型和孔隙分布几何模型。润湿性测试结果显示，Utica岩心样品呈弱水湿一中性润湿，水力压裂过程中大部分添加剂可以将页岩表面改变成更倾向于水相润湿的状态。

关键词：奥陶系Utica页岩岩石物理特性矿物组成微观孔隙结构页岩表面润湿性

边坡应力远程监测技术在山区公路中的应用研究

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北方交通 2021年第6期 56-59页

作者：白宝君辽宁省新宾满族自治县交通运输事业发展中心抚顺市113200

介绍了边坡应力远程监测技术的原理、系统组成及系统实施中的关键技术,结合某地实际应用案例,验证了应力远程监测系统的应用效果。边坡应力远程监测技术在公路交通领域的应用有助于提高公路边坡监测水平,推动公路交通系统防灾减灾的工... 详细信息

介绍了边坡应力远程监测技术的原理、系统组成及系统实施中的关键技术,结合某地实际应用案例,验证了应力远程监测系统的应用效果。边坡应力远程监测技术在公路交通领域的应用有助于提高公路边坡监测水平,推动公路交通系统防灾减灾的工作科技水平,在山区公路边坡治理中有广阔的应用前景。

关键词：山区公路高陡边坡滑坡应力监测锚索