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Evaluation of the injection and plugging ability of a novel epoxy resin in cement cracks

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Petroleum Science 2024年第2期21卷 1211-1220页

作者： guang-yao Leng Wei Yan Hai-Mu Ye Er-Dong yao Ji-Bin Duan Zheng-Xian Xu Ke-Pei Li Jing-Ru Zhang Zhong Li State Key Laboratory of Petroleum Resource&Prospecting China University of Petroleum(Beijing)Beijing102249China CNPC Liaohe Oilfield Gas Storage Co.LTD Panjin124000LiaoningChina CNOOC Research Institute Co. Ltd.Beijing100028China

Sustained casing pressure(SCP)is a crucial issue in the oil and gas production lifecycle.Epoxy resins,exhibiting exceptional compressive strength,ductility,and shear bonding strength,have the potential to form reliable barriers.The injectivity and sealing capacity of the epoxy resin is crucial parameters for the success of shallow remediation operations.This study aimed to develop and assess a novel solid-free resin sealant as an alternative to Portland cement for mitigating fluid leakage.The investigation evaluated the viscosity,compressive strength,and brittleness index of the epoxy resin sealant,as well as its tangential and normal shear strengths in conjunction with casing steel.The flow characteristics and sealing abilities of conventional cement and epoxy resin were comparatively analyzed in cracks.The results showed that the application of a viscosity reducer facilitated control over the curing time of the epoxy resin,ranging from 1.5 to 6 h,and reduced the initial viscosity from 865.53 to 118.71 m Pa,s.The mechanical properties of the epoxy resin initially increased with a rise in curing agent content before experiencing a minor decrease.The epoxy resin containing 30%curing agent exhibited optimal mechanical properties.After a 14-day curing period,the epoxy resin's compressive strength reached81.37 MPa,2.12 times higher than that of cement,whereas the elastic modulus of cement was 2.99 times greater than that of the epoxy resin.The brittleness index of epoxy resin is only 3.42,demonstrating high flexibility and toughness.The tangential and normal shear strengths of the epoxy resin exceeded those of cement by 3.17 and 2.82 times,respectively.In a 0.5 mm-wide crack,the injection pressure of the epoxy resin remained below 0.075 MPa,indicating superior injection and flow capabilities.Conversely,the injection pressure of cement surged dramatically to 2.61 MPa within 5 min.The breakthrough pressure of0.5 PV epoxy resin reached 7.53 MPa,decreasing the crack's permeability to 0.02 D,a mere 9.49%of the permeabilit

关键词： Sustained casing pressure Epoxy resin sealant Curing agent Viscosity reducer Mechanical properties Crack sealing

Research Progress in the Fabrication of Covalent Organic Framework Membranes for Chemical Separations

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Chinese Journal of Polymer Science 2024年第2期42卷 141-158,I0005页

作者： Cui-Ting Ding Jin-Qiu Yuan Meng-Ying Xie Qing-Yuan Liu Zeng-guang yao Shi-Yu Zhang Run-Nan Zhang Hong Wu Zhong-Yi Jiang Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Zhejiang Institute of Tianjin University NingboZhejiang315201China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin UniversityTianjin300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou350207China

Membrane technology has become one of the most promising separation technologies for its energy saving, high separation efficiency, environmental friendliness, and economic feasibility. Covalent organic frameworks(COFs) with intrinsically high porosity, controllable pore size, uniform pore size distribution and long-range ordered channel structure, have emerged as next-generation materials to fabricate advanced separation membranes. This feature article summarizes some latest studies in the development of pure COF membranes in our lab, including their fabrication and applications in chemical separations. Finally, current challenges facing high-performance COF separation membranes are discussed.

关键词： Covalent organic frameworks Covalent organic framework membranes Water treatment Organic solvent nanofiltration Gas separation

Vascular endothelium,a promising target for effectively treating fulminant diquat intoxication?

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World Journal of Clinical Cases 2024年第17期12卷 2917-2920页

作者： Xiang-Ying Cen Yi Chen Yong-An Xu guang-yao Zhong Department of Intensive Care Medicine Key Laboratory for Prevention and Treatment of Critical Illness in Dongguan CityBinhaiwan Central Hospital of DongguanDongguan 523903Guangdong ProvinceChina Department of Emergency Medicine The Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina Department of Critical Care Medicine Dongguan Eastern Central HospitalDongguan 523576Guangdong ProvinceChina

Following the withdrawal of paraquat,diquat(DQ)has emerged as the predominant herbicide.When people come into contact with or ingest DQ,may lead to poisoning and potentially fatal outcomes.Reports suggest that the mortality of DQ poisoning can be as high as 50%.DQ poisoning can be categorized as mild,moderate to severe or fulminant.In cases of fulminant poisoning,victims often succumb to multiple organ failure within 48 h.This presents a significant challenge in the clinical management.Scholars have discovered that oxidative stress,inflammatory injury,and cell apoptosis play crucial roles in the DQ poisoning.However,the underlying connection of the extensive organ damage remains unknown.The abnormal function and activity of endothelial cells(EC)should play a crucial role in tissue damage caused by DQ due to rich microcirculation and high sensitivity to perfusion in the vulnerable organs.However,reports on DQ-induced EC injury is rare.We made a preliminary discovery-the presence of severe vascular endothelial damage in the kidneys and lungs affected by DQ.Therefore,we hypothesize that DQ poisoning may be attributed to EC damage,ultimately resulting in multiple organ failure.

关键词： Diquat poisoning Endothelial cells Multiple organ dysfunction syndrome Treatment Oxidative stress

Experimental study of the effects of a multistage pore-throat structure on the seepage characteristics of sandstones in the Beibuwan Basin:Insights into the flooding mode

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Petroleum Science 2024年第2期21卷 1044-1061页

作者： Lei Wang Xiao Lei Qiao-Liang Zhang guang-Qing yao Bo Sui Xiao-Jun Chen Ming-Wei Wang Zhen-Yu Zhou Pan-Rong Wang Xiao-Dong Peng Zhanjiang Branch China National Offshore Oil Corporation(CNOOC)LimitedZhanjiang524057GuangdongChina Faculty of Earth Resources China University of Geosciences(Wuhan)Wuhan430074HubeiChina School of Resources and Safety Engineering Chongqing UniversityChongqing400044China School of Engineering University of ManchesterManchester M139WJUK Hainan Branch China National Offshore Oil Corporation(CNOOC)LimitedHaikou570311HainanChina

To investigate the relationship between grain sizes, seepage capacity, and oil-displacement efficiency in the Liushagang Formation of the Beibuwan Basin, this study identifies the multistage pore-throat structure as a crucial factor through a comparison of oil displacement in microscopic pore-throat experiments. The two-phase flow evaluation method based on the Li-Horne model is utilized to effectively characterize and quantify the seepage characteristics of different reservoirs, closely relating them to the distribution of microscopic pores and throats. It is observed that conglomerate sandstones at different stages exhibit significant heterogeneity and noticeable differences in seepage capacity, highlighting the crucial role played by certain large pore throats in determining seepage capacity and oil displacement efficiency. Furthermore, it was found that the displacement effects of conglomeratic sandstones with strong heterogeneity were inferior to those of conventional homogeneous sandstone, as evidenced by multiple displacement experiments conducted on core samples with varying granularities and flooding systems. Subsequently, core-based experiments on associated gas flooding after water flooding were conducted to address the challenge of achieving satisfactory results in a single displacement mode for reservoirs with significant heterogeneity. The results indicate that the oil recovery rates for associated gas flooding after water flooding increased by 7.3%-16.4% compared with water flooding alone at a gas-oil ratio of approximately 7000 m^(3)/m^(3). Therefore, considering the advantages of gas flooding in terms of seepage capacity, oil exchange ratio, and the potential for two-phase production, gas flooding is recommended as an energy supplement mode for homogeneous reservoirs in the presence of sufficient gas source and appropriate tectonic angle. On the other hand, associated gas flooding after water flooding is suggested to achieve a more favorable development effect compared to a single mode of energy

关键词： Beibuwan Basin Multistage pore-throat structure Multistage seepage characteristics Microscopic visualization Heterogeneity Gas/water flooding Flooding mode

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抑郁性快乐与算法时代的精神生活

南京大学学报（哲学．人文科学．社会科学） 2024年第2期61卷 137-146页

作者：王光耀苏州大学政治与公共管理学院哲学系江苏省苏州市215123

在算法时代,快乐转向自身的反题,成为抑郁性快乐。首先,各类数字平台生产了类型足够多样、数量足够丰富的刺激,从而扩大了我们的知觉范围,因此在表面上似乎使我们有可能摆脱单调、重复的生活。然而,所谓多样且丰富的感性刺激不过是算法... 详细信息

在算法时代,快乐转向自身的反题,成为抑郁性快乐。首先,各类数字平台生产了类型足够多样、数量足够丰富的刺激,从而扩大了我们的知觉范围,因此在表面上似乎使我们有可能摆脱单调、重复的生活。然而,所谓多样且丰富的感性刺激不过是算法的计算理性的化身。算法的计算逻辑精准地塑造了感性的神经生活。于是,着迷上瘾和厌倦无聊这互为对反的情调同时出现在算法时代的精神生活之中。其次,算法基于我们过去的行为痕迹,构造出在未来投喂给我们的信息,以此生产着我们的未来。我们在未来不断遭遇着我们的过去,从而也就不断复现和强化着我们既有的兴趣、偏好、意见、认知,进而深陷个人或群体的同质化内容的无限重复之中。当代传播学理论所谓的“信息茧房”“回音室”“过滤气泡”,无一不和算法的这种时间性构造机制相关。最后,在算法时代的神经生活中,主体快速地滑过一个又一个界面,沉浸在一个又一个即时性的快感之中,难以和客体对象建立起持续的、稳定的欲望关联。主体由此处在一种自身弥散的状态,弥散在高频率的点状快感之中,弥散在匿名算法所不断呈送出的快速变换而又离散的印象流之中。在这三重意义上,算法时代的神经生活中的快乐导向了自身的反题,最终成为抑郁性的快乐。

关键词：算法时代算法权力神经生活抑郁性快乐波德莱尔

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碳交易背景下中国华北地区碳代谢格局变化

环境科学 2024年第2期45卷 732-743页

作者：郑宏媚沈方许光耀关欣唐山师范学院资源管理系唐山市城市生态系统低碳转型仿真模拟及监测重点实验室唐山063000 华北理工大学艺术学院唐山063000

碳排放权交易市场作为推进美丽中国建设、实现降碳减污绿色发展的重要手段,成为当前研究的热点问题.为探究碳交易背景下华北地区试点区域及非试点区域碳代谢过程,以城市碳代谢理论为依据,采取投入产出分析和生态网络分析相结合的研究方... 详细信息

碳排放权交易市场作为推进美丽中国建设、实现降碳减污绿色发展的重要手段,成为当前研究的热点问题.为探究碳交易背景下华北地区试点区域及非试点区域碳代谢过程,以城市碳代谢理论为依据,采取投入产出分析和生态网络分析相结合的研究方法.结果表明,北京和天津作为早期交易试点区域,区域从2012年后呈现直接碳排放量稳步下降、隐含碳排放量缓慢增加趋势.试点产业部门直接排放量与隐含排放量变化趋势一致,其中煤炭开采和洗选业、石油和天然气开采业和非金属矿物制品业减排效应明显,而排放量较高的电力、热力的生产和供应业表现为增加趋势.部门隐含碳排放强度与隐含碳排放量变化趋势相似证实部门隐含增加值在交易过程中并未增加.高碳排放部门的隐含碳排放量主要由长度小于6的代谢路径所贡献,因此应重点关注部门间较短路径传递的商品或服务的“清洁化”.在交易政策实施以前,区域产业部门间跨区域贸易较少,表现为低碳排放产品交换;2012年以后,随着京津冀城市群协同发展以及华北地区不断构筑的区域经济发展新格局,促使区域间跨区域和跨部门贸易增加.以碳排放权交易制度为背景,构建识别系统内关键参与者及关键路径的方法体系,可为区域性政策实施及可持续发展提供科学的发展建议.

关键词：城市生态学碳代谢碳交易时空格局华北地区

基于改进神经网络的船舶航行速度估计数学模型

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舰船科学技术 2024年第4期46卷 70-73页

作者：姚光文上海华东师范大学物理与电子科学学院上海200241 上海电子信息职业技术学院上海201411

船舶航行速度直接影响船舶航行安全与路径规划效果,为此建立基于改进神经网络的船舶航行速度估计数学模型,提升船舶航行速度估计效果。利用位置编码机制,编码处理风速与波高等船舶航向速度相关数据;在编解码卷积神经网络内,引入自注意... 详细信息

船舶航行速度直接影响船舶航行安全与路径规划效果,为此建立基于改进神经网络的船舶航行速度估计数学模型,提升船舶航行速度估计效果。利用位置编码机制,编码处理风速与波高等船舶航向速度相关数据;在编解码卷积神经网络内,引入自注意力机制,得到改进编解码卷积神经网络;利用编码后的船舶航速训练数据,训练改进神经网络,建立船舶航行速度估计数学模型;在该模型内,输入编码后的船舶航速测试数据,通过自注意力机制,提取船舶航速数据特征,并结合自注意力蒸馏剔除冗余特征;通过全连接层处理船舶航速数据特征,输出船舶航行速度估计结果。实验证明,该模型可有效提取船舶航速数据特征;该模型可精准估计船舶航行速度;在不同浪向下,该模型船舶航行速度估计的决定系数均较高,即估计精度较高。

关键词：改进神经网络船舶航行速度估计数学模型位置编码自注意力机制

Origami-inspired frequency selective surface with large bandwidth modulation range based on electromagnetically induced transparency effect

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Science China(Information Sciences) 2022年第10期65卷 303-304页

作者： Sihong CHEN Taisong PAN Wei WANG Yu GU guang yao Min GAO Zhumei CHEN Yuan LIN School of Materials and Energy University of Electronic Science and Technology of China School of Physics University of Electronic Science and Technology of China Qiantang Science and Technology Innovation Center

Dear editor,Frequency selective surfaces(FSSs) have been intensively studied as a powerful tool to modulate the transmission of the electromagnetic(EM) waves, allowing either bandpass or bandstop selection of the EM waves [1]. In this study, we periodically deployed the classical resonators for electromagnetically induced transparency(EIT), cut-wire(CW),

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Flexible bioelectronic innovation for personalized health management

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Cancer Innovation 2023年第3期2卷 167-171页

作者： Maowen Xie guang yao Yuan Lin School of Materials and Energy University of Electronic Science and Technology of ChinaChengduSichuanChina State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengduSichuanChina Medico-Engineering Cooperation on Applied Medicine Research Center University of Electronic Science and Technology of ChinaChengduSichuanChina Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhenGuangdongChina

1|INTRODUCTION With the rapid developments in intelligent medical care and interdisciplinary science,innovative flexible bioelectronics(FBEs)are emerging for monitoring health,diagnosing and treating diseases,and even... 详细信息

关键词： bioelectronics flexible innovation