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Study on Optimal Water ControlMethods for Horizontal Wells in Bottom Water Clastic Rock Reservoirs

Fluid Dynamics & Materials Processing 2024年第10期20卷 2377-2392页

作者： xianghua liu Hai Song Lu Zhao Yan Zheng Neng Yang Dongling Qiu Sinopec Northwest Oilfield Branch Northwest Oilfield Branch of China Petroleum and Chemical CorporationUrumqi830011China School of Petroleum and Natural Gas Engineering Southwest Petroleum UniversityChengdu610500China

The segmented water control technology for bottom water reservoirs can effectively delay the entry of bottom water and adjust the production *** clarify the impact of different methods on horizontal well production with different reservoir conditions and to provide theoretical support for the scientific selection of methods for bottom water reservoirs,a numerical simulation method is presented in this study,which is able to deal with wellbore reservoir coupling under screen tube,perforation,and ICD(Inflow Control Device)*** the geological characteristics of the bottom-water conglomerate reservoir in the Triassic Formation of the Tahe Block 9 as a test case,the three aforementioned completion methods are tested to predict the transient production *** impact of completion parameters,reservoir permeability,bottom-water energy,and individual well control on the time to encounter water in horizontal wells(during a water-free production period)is discussed.A boundary chart for the selection of completion methods is introduced *** results show that the optimized ICD completion development effect for heterogeneous reservoirs is the best,followed by optimized perforation *** is the main factor affecting the performances of completion methods,while bottom water energy and single well controlled reserves have a scarce *** average permeability of the reservoir is less than 500 mD,and ICD has the best water control *** the permeability is greater than 500 mD,the water control effect of perforation completion becomes a better option.

关键词： Completion method bottom water low-permeability oil reservoir horizontal well development effect

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习近平生态文明思想指引下的耕地生态补偿机制构建

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中国农业资源与区划 2024年第3期45卷 59-68页

作者：刘利花蔡英谦刘向华广东第二师范学院马克思主义学院河南农业大学经济与管理学院

[目的]在习近平生态文明思想的指引下，构建以补偿标准为核心的长效耕地生态补偿机制，使耕地生态补偿真正进入可操作阶段。[方法]文章通过梳理国内外相关文献，界定耕地生态补偿及其补偿机制的内涵，分析耕地生态补偿机制的构建原则、... 详细信息

[目的]在习近平生态文明思想的指引下，构建以补偿标准为核心的长效耕地生态补偿机制，使耕地生态补偿真正进入可操作阶段。[方法]文章通过梳理国内外相关文献，界定耕地生态补偿及其补偿机制的内涵，分析耕地生态补偿机制的构建原则、补偿主体和对象的确定、补偿标准的核算方法、补偿方式、补偿资金管理及来源、补偿机制的运作及保障措施。[结果]（1）创新性地构建了省际和省内两个层次相结合的耕地生态补偿机制，特别是探讨了省内农民耕地生态补偿标准弹性区间的确定方法：补偿理论值、补偿现实值。（2）地方政府可以根据区域经济社会发展水平、自身的财政支付能力，在该区间范围内调整补偿标准，使得补偿更为灵活，既能体现耕地生态系统服务价值，又能反映农民的意愿。[结论]省际和省内相结合的耕地生态补偿机制的构建能够实现全方位的耕地生态补偿，有助于促进乡村振兴目标的实现，助推农业生态文明社会的形成。

关键词：习近平生态文明思想耕地生态系统服务生态补偿机制

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顺北油气田特深井钻井关键技术现状与发展建议

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石油钻探技术 2024年第2期52卷 72-77页

作者：刘湘华于洋刘景涛中国石化西北油田分公司新疆乌鲁木齐830011 中国石化西北油田分公司石油工程技术研究院新疆乌鲁木齐830011

顺北油气田资源储量丰富,但油气埋藏深,储层具有超深、高压、超高温特点,被公认为钻完井的“世界禁区”。因此,探索适用于顺北油气田特深井的高效钻井技术系列,对加快该油气田高效开发具有重要意义。针对顺北油气田钻井技术难点,通过多... 详细信息

顺北油气田资源储量丰富,但油气埋藏深,储层具有超深、高压、超高温特点,被公认为钻完井的“世界禁区”。因此,探索适用于顺北油气田特深井的高效钻井技术系列,对加快该油气田高效开发具有重要意义。针对顺北油气田钻井技术难点,通过多年技术攻关和实践,形成了高效钻井技术系列,主要包括井身结构优化设计技术、古生界分层提速技术、复杂地层井筒强化技术、易漏地层高效防漏固井技术、高温储层高效定向技术和断控型储层保护技术。通过强化地质工程一体化并推广应用成熟技术,在井深逐年增加的情况下,钻井周期逐年缩短,保障了顺北油气田高效勘探、效益开发。指出需持续提升一井多控,断裂间安全钻井、异常高压工程应对能力,加强工具、材料耐温性能等关键核心技术攻关力度,提出应加大万米深井钻探的基础理论、关键技术与装备攻关研究,以进一步推动顺北油气田勘探开发步伐,保障安全成井,不断解锁“中国深度”。

关键词：特深井井身结构分层提速防漏储层保护顺北油气田

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Recent Development on Theory and Application of Variable Gauge Rolling, a Review

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 483-493页

作者： xianghua liu Qilin Zhao Lizhong liu Research Institute of Science and Technology Northeastern University School of Materials and Metallurgy Northeastern University

Variable gauge rolling （VGR） is a new technology for producing the materials which have the advantage of lightweight due to optimized thickness according to load distribution. The new progresses in the theoretical research and application of VGR are reviewed in this paper. Two basic equations, VGR-f and VGR-s, were deduced. The former is a new differential equation of force equilibrium, and the latter is a new form of formula for the law of mass conservation. Both of them provide a new base for the development of VGR analysis. As the examples of VGR＇s application, tailor rolled blank （TRB） and longitudinal profile （LP） plate are introduced. Now TRBs are only produced in Germany and China, and have been used in the automotive manufacturing to play an important role in lightweight design. LP plates have been used in shipbuilding and bridge construction, and promised a bright prospect in reducing construction weight. In addition, new technologies and applications of VGR emerge constantly. Tailor welded strips and tailor rolled strips with variable thickness across the width can be used for progressive die and roll forming. The 3D profiled blank can be obtained by two-step rolling process. Tailor tubes witli the variable wail thickness are an efficient way to reduce the weight. The blank with tailored thickness and mechanical property is also under development. Above products based on the tailored ideas provide a new materials-warehouse for the designers to select so as to meet the needs of weight reducing and material saving.

关键词： Variable gauge rolling Tailor rolled blank Longitudinal profile plate Material saving Weight reducing

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Dynamic Recrystallization and Precipitation Behavior of Mn-Cu-V Weathering Steel

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Journal of Materials Science & Technology 2011年第12期27卷 1131-1138页

作者： Hongyan Wu Linxiu Du xianghua liu State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

The hot deformation behavior of a Mn-Cu-V weathering steel was investigated at temperatures ranging from 850 to 1050℃ and strain rates ranging from 0.01 to 5 s-1 using MMS-300 thermal-mechanical simulator. The activation energy for dynamic recrystallization and stress exponent were calculated to be 551 kJ/mol and 7.73, respectively. The accurate values of critical strain were determined by the relationship between work hardening rate and flow stress （θ-σ） curves. The hyperbolic sine constitutive equation was employed to describe the relationship between the peak stress and Zener-Hollomon parameter during hot deformation. The interaction between dynamic recrystallization and dynamic precipitation of V（C,N） at a low strain rate was analyzed. The results showed that precipitation particles size of weathering steel increased with increasing strain at deformation temperature g50~C and strain rate 0.1 s-I. The calculation results of the recrystallization driving force and pinning force showed that dynamic precipitation could retard the progress of dynamic recrystallization but not prevent it while the pinning forces is less than driving force. On the contrary, dynamic precipitation can effectively prevent the progress of dynamic recrystallization.

关键词： Weathering steel Critical strain Dynamic recrystallization Dynamic precipitation

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Enhanced mechanical stability of ultrafine grained steel through intercritical annealing cold rolled martensite

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Acta Metallurgica Sinica(English Letters) 2012年第6期25卷 443-452页

作者： Huifang LAN xianghua liu Linxiu DU The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

The ultrafine grained ferritic steels possess shortage of work hardening. Fine grained high strength but low ductility due to the ferrite-martensite dual phase microstruc- ture was obtained in a microalloyed steel and low carbon steels through intercritical annealing of the cold rolled martensite. The dual phase microstructure was uniform and the ferrite grain size was smaller in the microalloyed steel resulted from the pin- ning effect of microalloyed precipitates. But ferrite grown apparently and the volume fraction of the martensite was much higher without the addition of microalloying el- ements. By introducing martensite into the fine grained ferrite, the work hardening was effectively improved, leading to better mechanical stability. As a result of the fine ferrite grain size as well as uniform distribution of the martensite, the work harden- ing was enhanced, showing better strength-ductility balance in the microalloyed dual phase steel.

关键词： Mechanical stability Fine grained dual phase steel Work hardening Strength-ductility balance

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星地融合下的手机直连关键技术研究

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电信科学 2024年第4期40卷 10-17页

作者：刘会叶阳丁志东刘湘华朱子园周晶中国联合网络通信有限公司研究院北京100076

当前,大众用户和行业用户对星地融合通信的需求不断演进,以实现无缝覆盖与随时随地接入,集成卫星和地面通信能力将是未来手机终端的发展方向。首先介绍了手机直连的应用场景、国内外发展路径和相关技术方案;其次,针对3GPP NTN标准化技... 详细信息

当前,大众用户和行业用户对星地融合通信的需求不断演进,以实现无缝覆盖与随时随地接入,集成卫星和地面通信能力将是未来手机终端的发展方向。首先介绍了手机直连的应用场景、国内外发展路径和相关技术方案;其次,针对3GPP NTN标准化技术方案,分析了实现手机直连的组网架构和空口关键技术方案,并探讨了卫星通信场景下多模终端在天线能力、语音能力及节能方面的需求及潜在改进方案;最后阐述了手机直连频谱资源及挑战,为星地融合手机直连终端通信设计提供参考。

关键词：非地面网络 5G 星地融合手机直连卫星通信

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Springback characteristics in U-channel forming of tailor rolled blank

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Acta Metallurgica Sinica(English Letters) 2012年第3期25卷 207-213页

作者： Huawei ZHANG Lizhong liu Ping HU xianghua liu School of Automotive Engineering Faculty of Vehicle Engineering and Mechanics State Key Labora- tory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China Research Institute of Science and Technology Northeastern University Shenyang 110819 China

Residual stress developed during the rolling process of tailor rolled blank （TRB） can affect the springback of finished parts considerably. Springback characteristics of unannealed and annealed TRBs were investigated by means of numerical simulation and experiments taking U-Channel as an example. TRBs were annealed by the annealing process （700 ℃, holding time 10 h）, then stamping and springback processes of unannealed and annealed TRBs were simulated, and corresponding experiments were also carried out. Effects of the transition zone length, the blank thickness, the friction coefficient and the die clearance on the springback of TRB were analyzed. The results demonstrate that the springback of TRB annealed at 700 ~C for 10 h re- duces significantly. For unannealed and annealed U-Channels, the springback of TRB U-Channel is in direct proportion to the die clearance and is in inverse proportion to the transition zone length, the blank thickness and the friction coefficient. Spring- backs of the thinner monolithic （uniform thickness） blank, the thinner side of TRB, the thicker side of TRB and the thicker monolithic blank are sorted in descending order.

关键词： Tailor rolled blank Springback Annealing

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Microstructure and mechanical properties of X80 pipeline steels in different cooling schedules

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Acta Metallurgica Sinica(English Letters) 2010年第3期23卷 171-175页

作者： Min ZHOU Linxiu DU xianghua liu State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110819 China

The microstructures and mechanical properties of three X80 pipeline steel plates were investigated in this *** plates were hot rolled by two stages, and cooled by three different cooling schedules to obtain different microstructures and mechanical *** electron microscope（TEM） was used to observe the *** results indicated that the amount of polygonal ferrite（PF） and quasi-polygonal ferrite（QPF） decreased with decreasing of the finish cooling temperature（FCT）, while the amount and size of M-A islands were *** promoted the Charpy V-notch（CVN） impact toughness at-20℃, but not the drop weight tear testing（DWTT） property at-15℃, and decreased the strength of the steel.

关键词： Microstructure Mechanical properties Cooling schedule Relaxation

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基于文本挖掘的监护仪故障诊断研究

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生物医学工程学杂志 2024年第1期41卷 168-176页

作者：贺祥飞张和华黄靖赵德春李洋聂瑞刘相花重庆邮电大学自动化学院重庆400065 陆军军医大学大坪医院医学工程科重庆400042 重庆邮电大学生物信息学院重庆400065

传统监护仪故障诊断多依赖人工经验,诊断效率较低且故障维修文本数据未得到有效利用。针对以上问题,本文提出一种基于多特征文本表示以及改进的双向门控循环神经元网络(BiGRU)和注意力机制的监护仪故障智能诊断方法。首先,对文本进行预... 详细信息

传统监护仪故障诊断多依赖人工经验,诊断效率较低且故障维修文本数据未得到有效利用。针对以上问题,本文提出一种基于多特征文本表示以及改进的双向门控循环神经元网络(BiGRU)和注意力机制的监护仪故障智能诊断方法。首先,对文本进行预处理,采用基于转换器(Transformer)的语言激励双向编码器表示生成含有多种语言学特征的词向量;然后,通过改进的BiGRU和注意力机制对双向故障特征分别进行提取并加权;最后,使用加权损失函数降低类别不平衡对模型的影响。为证实所提方法的有效性,本文使用监护仪故障数据集进行验证,总体宏F1值达到91.11%。该结果表明,本文所建模型可实现故障文本的自动分类,或可为今后监护仪故障智能诊断提供辅助决策支持。

关键词：监护仪故障诊断文本挖掘预训练语言模型注意力机制

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