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A micro-crosslinked amphoteric hydrophobic association copolymer as high temperature-and salt-resistance fluid loss reducer for water-based drilling fluids

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Petroleum Science 2024年第3期21卷 1980-1991页

作者： Jian Li Yu-Xi Ji Xiao-Xiao Ni Kai-he lv Xian-Bin Huang Jin-Sheng Sun School of Petroleum Engineering China University of Petroleum(East China) Key Laboratory of Unconventional Oil & Gas Development China University of Petroleum(East China) Inspection and Testing Center of Huabei Oil Field Company PetroChina Drilling Fluid Research Institute CNPC Engineering Technology R&D Company Limited

During ultradeep oil and gas drilling, fluid loss reducers are highly important for water-based drilling fluids, while preparing high temperature-and salt-resistance fluid loss reducers with excellent rheology and filtration performance remains a challenge. herein, a micro-crosslinked amphoteric hydrophobic association copolymer(i.e., DADC) was synthesized using N,N-dimethyl acrylamide, diallyl dimethyl ammonium chloride, 2-acrylamido-2-methylpropane sulfonic acid, hydrophobic monomer, and pentaerythritol triallyl ether crosslinker. Due to the synergistic effects of hydrogen bonds, electrostatic interaction, hydrophobic association, and micro-crosslinking, the DADC copolymer exhibited outstanding temperature-and salt-resistance. The rheological experiments have shown that the DADC copolymer had excellent shear dilution performance and a certain degree of salt-responsive viscosity-increasing performance. The DADC copolymer could effectively adsorb on the surface of bentonite particles through electrostatic interaction and hydrogen bonds, which bring more negative charge to the bentonite, thus improving the hydration and dispersion of bentonite particles as well as the colloidal stability of the drilling fluids. Moreover, the drilling fluids constructed based on the DADC copolymer exhibited satisfactory rheological and filtration properties(FLHTHP= 12 m L) after aging at high temperatures(up to200°C) and high salinity(saturated salt) environments. Therefore, this work provided new insights into designing and fabricating high-performance drilling fluid treatment agents, demonstrating good potential applications in deep and ultradeep drilling engineering.

关键词： Fluid loss reducer Temperature- and salt-resistance Hydrophobic association Amphoteric Micro-crosslinking

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Recent progress in electrospun nanofibers and their applications in heavy metal wastewater treatment

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Frontiers of Chemical Science and Engineering 2023年第3期17卷 249-275页

作者： Xizi Xu he lv Mingxin Zhang Menglong Wang Yangjian Zhou Yanan Liu Deng-Guang Yu School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Engineering Technology Research Center for High-Performance Medical Device Materials Shanghai 200093China

Novel adsorbents with a simple preparation process and large capacity for removing highly toxic and nondegradable heavy metals from water have drawn the attention of researchers.Electrospun nanofiber membranes usually have the advantages of large specific surface areas and high porosity and allowing flexible control and easy functionalization.These membranes show remarkable application potential in the field of heavy metal wastewater treatment.In this paper,the electrospinning technologies,process types,and the structures and types of nanofibers that can be prepared are reviewed,and the relationships among process,structure and properties are discussed.On one hand,based on the different components of electrospun nanofibers,the use of organic,inorganic and organic−inorganic nanofiber membrane adsorbents in heavy metal wastewater treatment are introduced,and their advantages and future development are summarized and prospected.On the other hand,based on the microstructure and overall structure of the nanofiber membrane,the recent progresses of electrospun functional membranes for heavy metal removal are reviewed,and the advantages of different structures for applications are concluded.Overall,this study lays the foundation for future research aiming to provide more novel structured adsorbents.

关键词： electrospinning heavy metal adsorption nanostructure wastewater

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Multidimensional defects tailoring local electron and Mg^(2+) diffusion channels for boosting magnesium storage performance of WO_(3)/MoO_(2)

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Journal of Energy Chemistry 2023年第9期84卷 476-485页

作者： Shiqi Ding Yuxin Tian Jiankang Chen he lv Amin Wang Jingjie Dai Xin Dai Lei Wang Guicun Li Alan Meng Zhenjiang Li College of Materials Science and Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life ScienceMOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Engineering Research Center for New Metallic Functional Materials Characteristic Laboratory of Advanced Metal Functional Materials and Processing in Universities of ShandongQingdao Binhai UniversityQingdao 266555ShandongChina College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina

Defect engineering presents great promise in addressing lower specific capacity,sluggish diffusion kinetics and poor cycling life issues in energy storage devices.herein,multidimensional(0D/2D/3D) structural defects are constructed in WO_(3)/MoO_(2) simultaneously via competing for and sharing with O atoms during simple hydrothermal process.OD and 2D defects tailor local electron,activating more sites and generating built-in electric fields to yield ion reservoir,meanwhile,3D defect owning lower anisotropic property tailors Mg^(2+) diffusion channels to fully exploit Mg^(2+) adsorbed sites induced by OD and 2D defects,enhance the kinetics and maintain structural stability.Benefitted from synergistic effect of 0D/2D/3D structural defects,the designed WO_(3)/MoO_(2) shows the higher specific capacity(112.8 mA h g^(-1) at 50 mA g^(-1) with average attenuation rate per cycle of 0.068%),superior rate capability and excellent cycling stability(specific capacity retention of 80% after 1500 cycles at 1000 mA g^(-1)).This strategy provides design ideas of introducing multidimensional structural defects for tailoring local electron and microstructure to improve energy storage property.

关键词： Multidimensional defects Local electron tailoring heterostructure Cathode Magnesium ions batteries

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平台数据治理策略如何助力商业价值创造?——基于关系连接视角

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经济管理 2024年第3期46卷 5-21页

作者：苏敬勤吕禾雨大连理工大学经济管理学院辽宁大连116024

数字经济时代,数据成为平台企业的关键生产要素,关系连接则是数据爆炸式增长的隐含前提。然而,平台企业在经由数据治理创造商业价值时,却面临着“如何基于特定关系对平台数据进行有效治理”的难题。本文基于关系连接视角,以中国短视频... 详细信息

数字经济时代,数据成为平台企业的关键生产要素,关系连接则是数据爆炸式增长的隐含前提。然而,平台企业在经由数据治理创造商业价值时,却面临着“如何基于特定关系对平台数据进行有效治理”的难题。本文基于关系连接视角,以中国短视频行业中的两家头部平台企业(快手和抖音)为研究对象,通过双案例对比研究,深入探讨平台企业数据治理的作用机制及其对商业价值创造的内在影响。研究发现:(1)平台企业依据关系的特征优势制定数据治理策略,并在数据生命周期中不断推动关系网络的构建与演化,进而激发并强化网络效应。(2)随着数据治理的发展和演进,平台企业的关系特征愈发明显进而影响到治理模式和商业价值创造形式。(3)由于关系情境和连接强度的差异,平台企业数据治理在强关系中表现为补偿机制,而在弱关系中表现为管控机制。本研究不仅从动态视角深化了对平台数据治理的解构与认知,还丰富拓展了关系及其治理的相关研究。同时,本研究充分考虑了中国独特的关系情境,弥补了平台治理中本土化情境研究的不足。此外,本文也为平台如何基于用户关系进行数据治理提供了实践启示,这将有助于满足不同关系类型下的用户需求和实现平台整体目标。

关键词：数据治理策略关系连接关系治理社交媒体平台

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开放教育课程思政融入乡村振兴“领头雁”人才培养路径研究——以云南开放大学管理学课程为例

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云南开放大学学报 2024年第2期26卷 53-59页

作者：唐季吕明何俊吕云南开放大学云南昆明650221 西南林业大学经济管理学院云南昆明650224

开放教育课程思政融入乡村振兴“领头雁”人才培养是发挥开放教育普惠作用,实现课程思政育人价值的重要抓手。依托云南开放大学针对村(社区)干部学历继续教育的管理学课程,课程思政与知识讲解、要点巩固、沟通互动、实践体验等教学环节... 详细信息

开放教育课程思政融入乡村振兴“领头雁”人才培养是发挥开放教育普惠作用,实现课程思政育人价值的重要抓手。依托云南开放大学针对村(社区)干部学历继续教育的管理学课程,课程思政与知识讲解、要点巩固、沟通互动、实践体验等教学环节有机融合的路径,目前仍然存在思政元素挖掘的系统性和深入度不够、课程思政呈现方式不够丰富及时代性不足、课程思政效果考核不完善等问题。需要从以专业思政建设把课程思政连点成线突出其在能力塑造中的效用、结合新媒体技术盘活课程思政育人方式、发挥开放教育远程平台和体系办学优势形成线上线下的混合育人效果考核等方面来改进完善。

关键词：开放教育管理学课程思政乡村振兴“领头雁”

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Improving the anti-collapse performance of water-based drilling fluids of Xinjiang Oilfield using hydrophobically modified silica nanoparticles with cationic surfactants

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Petroleum Science 2023年第3期20卷 1768-1778页

作者： he Li Xian-Bin Huang Jin-Sheng Sun Kai-he lv Xu Meng Zhen Zhang Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China) Ministry of Education)Qingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China PetroChina Tarim Oilfield Company Korla841000XinjiangPR China

Wellbore instability,especially drilling with water-based drilling fluids(WBDFs)in complex shale for-mations,is a critical challenge for oil and gas development.The purpose of this paper is to study the feasibility of using hydrophobically modified silica nanoparticle(HMN)to enhance the comprehensive performance of WBDFs in the Xinjiang Oilfield,especially the anti-collapse performance.The effect of HMN on the overall performance of WBDFs in the Xinjiang Oilfield,including inhibition,plugging,lu-bricity,rheology,and filtration loss,was studied with a series of experiments.The mechanism of HMN action was studied by analyzing the changes of shale surface structure and chemical groups,wettability,and capillary force.The experimental results showed that HMN could improve the performance of WBDFs in the Xinjiang Oilfeld to inhibit the hydration swelling and dispersion of shale.The plugging and lubrication performance of the WBDFs in the Xinjiang Oilfield were also enhanced with HMN based on the experimental results.HMN had less impact on the rheological and filtration performance of the WBDFs in the Xinjiang Oilfield.In addition,HMN significantly prevented the decrease of shale strength.The potential mechanism of HMN was as follows.The chemical composition and structure of the shale surface were altered due to the adsorption of HMN driven by electrostatic attraction.Changes of the shale surface resulted in significant wettability transition.The capillary force of the shale was converted from a driving force of water into the interior to a resistance.In summary,hydrophobic nanoparticles presented afavorable application potential for WBDFs.

关键词： Hydrophobic nanoparticle Wetting alteration Wellbore stability Water-based drilling fluids Shale

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Toward Trustworthy Decision-Making for Autonomous Vehicles:A Robust Reinforcement Learning Approach with Safety Guarantees

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Engineering 2024年第2期33卷 77-89页

作者： Xiangkun he Wenhui Huang Chen lv School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

While autonomous vehicles are vital components of intelligent transportation systems,ensuring the trustworthiness of decision-making remains a substantial challenge in realizing autonomous driving.Therefore,we present a novel robust reinforcement learning approach with safety guarantees to attain trustworthy decision-making for autonomous vehicles.The proposed technique ensures decision trustworthiness in terms of policy robustness and collision safety.Specifically,an adversary model is learned online to simulate the worst-case uncertainty by approximating the optimal adversarial perturbations on the observed states and environmental dynamics.In addition,an adversarial robust actor-critic algorithm is developed to enable the agent to learn robust policies against perturbations in observations and dynamics.Moreover,we devise a safety mask to guarantee the collision safety of the autonomous driving agent during both the training and testing processes using an interpretable knowledge model known as the Responsibility-Sensitive Safety Model.Finally,the proposed approach is evaluated through both simulations and experiments.These results indicate that the autonomous driving agent can make trustworthy decisions and drastically reduce the number of collisions through robust safety policies.

关键词： Autonomous vehicle Decision-making Reinforcement learning Adversarial attack Safety guarantee

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Double network self-healing hydrogel based on hydrophobic association and ionic bond for formation plugging

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Petroleum Science 2022年第5期19卷 2150-2164页

作者： Ying-Rui Bai Qi-Tao Zhang Jin-Sheng Sun Guan-Cheng Jiang Kai-he lv School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing102206China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China

Self-healing hydrogels have attracted tremendous attention in the field of oil and gas drilling and production engineering because of their excellent self-healing performance after physical damage.In this study,a series of double network self-healing(DN_(SA))hydrogels based on hydrophobic association and ionic bond were prepared for plugging pores and fractures in formations in oil and gas drilling and production engineering.The mechanical,rheological,and self-healing properties of the DN_(SA)hydrogels were investigated.Results revealed that the DN_(SA)hydrogels exhibited excellent mechanical properties with a tensile stress of 0.67 MPa and toughness of 7069 kJ/cm^(3) owing to the synergistic effect of the double network.In addition,the DN_(SA)hydrogels exhibited excellent compression resistance,notch insensitivity,and self-healing properties.The DN_(SA)-2 hydrogel was granulated and made into gel particles with different particle sizes and used as a plugging agent.The self-healing mechanism of DN_(SA)-2 hydrogel particles in fractures was explored,and it’s plugging effect on fractures of different widths and porous media of different permeabilities were investigated.Experimental results revealed that the plugging capacity of the DN_(SA)-2 hydrogel particles for a fracture with width of 5 mm and a porous medium with a permeability of 30μm^(2) was 3.45 and 4.21 MPa,respectively,which is significantly higher than those of commonly used plugging agents in the oilfield.The DN_(SA)hydrogels with excellent mechanical and self-healing properties prepared in this study will provide a new approach for applying hydrogels in oil and gas drilling and production engineering.

关键词： Self-healing hydrogel Hydrophobic association Ionic bond Mechanical property Rheological property Formation plugging

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Longitudinal vibration characteristics of a tapered pipe pile considering the vertical support of surrounding soil and construction disturbance

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 51-63页

作者： Li Zhenya Pan Yunchao he Xianbin lv Chong Mohammad Towhid Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China Geotechnical Research Institute Hohai UniversityNanjing 210098China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China

This research is concentrated on the longitudinal vibration of a tapered pipe pile considering the vertical support of the surrounding soil and construction disturbance.First,the pile-soil system is partitioned into finite segments in the vertical direction and the Voigt model is applied to simulate the vertical support of the surrounding soil acting on the pile segment.The surrounding soil is divided into finite ring-shaped zones in the radial direction to consider the construction disturbance.Then,the shear complex stiffness at the pile-soil interface is derived by solving the dynamic equilibrium equation for the soil from the outermost to innermost zone.The displacement impedance at the top of an arbitrary pile segment is obtained by solving the dynamic equilibrium equation for the pile and is combined with the vertical support of the surrounding soil to derive the displacement impedance at the bottom of the upper adjacent segment.Further,the displacement impedance at the pile head is obtained based on the impedance function transfer technique.Finally,the reliability of the proposed solution is verified,followed by a sensitivity analysis concerning the coupling effect of the pile parameters,construction disturbance and the vertical support of the surrounding soil on the displacement impedance of the pile.

关键词： tapered pipe pile longitudinal vibration vertical support of the surrounding soil construction disturbance displacement impedance

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Plugging performance and mechanism of an oil-absorbing gel for lost circulation control while drilling in fractured formations

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Petroleum Science 2022年第6期19卷 2941-2958页

作者： Ying-Rui Bai Li-Yao Dai Jin-Sheng Sun Guan-Cheng Jiang Kai-he lv Rong-Chao Cheng Xiao-Sen Shang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing102206China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China

Lost circulation of drilling fluid is one of the most common engineering problems in the drilling process of fractured formations.In this study,an oil-absorbing polymer gel synthesized using compound monomers with rigid and flexible chains was applied to control the oil-based drilling fluid loss while drilling.The microstructure,oil-absorbing performance,and plugging performance the gel was investigated.A large number of dense pores on the surface of the gel were observed,which allowed the oil molecules to enter the internal space of the gel.The initial oil absorption capacity of the gel was fast,and it increased with the increase in the temperature and decrease in the particle size,reaching 20.93 g/g at140℃.At a high temperature of 140℃,the bearing pressure capacity of the gel formula containing particles of different particle sizes reached 7.6 MPa for a fracture of a width of 3 mm,showing that the oil-absorbing gel have excellent plugging performance at high temperature.Plugging mechanism of the gel was investigated through visualized fracture plugging experiments.Results show that the dynamic migratio n,particle-swelling,particle-bridging,particle-aggregation,deformation-filling,and compaction-plugging contribute to the whole lost circulation control process,reflecting that the plugging performance can be effectively enhanced by improving the aggregation and filling degrees of the gel with different particle sizes.

关键词： Lost circulation Oil-absorbing gel Oil absorption capacity Plugging mechanism Fractured formation

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