检索结果-南通市图书馆

New insights into the DPR mechanism of elastic energy released by polymer gel for enhanced oil recovery

PETROLEUM 2024年第3期10卷 539-547页

作者： Jia, Hu Wu, Junyi Wu, Shaowei Liang, Yanbin wang, Minghao wan, xiaojin Li, Pengwu Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu Peoples R China CNOOC Zhanjiang Branch Zhanjiang Peoples R China PetroChina Dagang Oilfield Co Oil Prod Technol Inst Tianjin Peoples R China

Polymer gel was widely used as water shutoff agent in mature oil fields. And the results of single-phase plugging experiments show that the plugging rate of the polymer gel to the oil phase is lower than that of the water phase. However, the disproportionate permeability reduction (DPR) mechanism of polymer gels still remains controversial. In this paper, we used four gel formulations including polyethyleneimine (PEI) and phenol-formaldehyde crosslinked gel with and without adding laponite to investigate the effect of gel elastic property on the water shutoff mechanism. The result of sand pack flooding experiments shown that the gel with higher elastic modulus has better effects on decreasing water cut and increasing oil recovery. After adding laponite, the elastic modulus of phenol-formaldehyde crosslinked gel increased from 64.2 Pa to 192 Pa, and the elastic modulus of PEI crosslinked gel increased from 27.4 Pa to 36.5 Pa. Compared to the phenol-formaldehyde-HAPM gel, the oil recovery of laponite-phenol-formaldehyde-HPAM gel increased by 5.2% and the maximum water cut decreased by 8.3%. Besides, comparing with PEI-HPAM gel, the oil recovery of laponite-PEI-HPAM gel increased by 2.7% and the water cut dropped by 27.8%. In the meanwhile, the laponite-phenol-formaldehyde-HPAM gel with higher elastic modulus obviously swells in the formation water but almost remains constant in oil at 105 degrees C. The mass of gel soaked in the formation water increased from 42 g to 96 g and the gel volume increased by 300% within 48 hours. This study improves the understanding of the DPR mechanism of polymer gel for water shutoff. (c) 2022 Southwest Petroleum University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Gel elasticity Water shutoff DPR Laponite Oil recovery DISPROPORTIONATE PERMEABILITY REDUCTION NONIONIC POLYACRYLAMIDE WATER PERMEABILITY PHENOLIC RESIN

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tribological Properties and Failure Analysis of PTFE Composites used for Seals in the Transmission Unit

引用

Journal of Wuhan University of Technology(Materials Science) 2013年第1期28卷 26-30页

作者：宫燃 wan xiaojin ZHANG Xuerong School of Automotive and Traffic Engineering Jiangsu University School of Automotive Engineering Wuhan University of Technology

The sealing rings are one of the most important components as the sealing devices in the wet clutch unit of a heavy vehicle. The sealing ring, made from PTFE composites, was subjected to serious wear on the sealing surface, but the mating metal surface only had slight abrasion. A specialized test rig was designed for wear research and failure analysis of the sealing ring. The composition analyses of the ring material, working conditions and wear surface characteristics by visual inspection and tribological properties as well as microscopic analysis with scanning electron microscope was performed to determine the wear mechanism and failure causes. Results revealed that the wear of PTFE composites was characterized by abrasion and adhesion after a certain duration testing, and the wear mechanism changed to thermal fatigue and abrasive wear in the stage of intense wear. The thermal deformation and fatigue were primarily responsible for the rapid wear of the PTFE composites for the sealing rings.

关键词： PTFE composite tribological properties seals failure analysis thermal effects

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

分散型调驱体系在高温高盐油藏多孔介质内的匹配性研究

引用

当代化工 2024年第4期53卷 905-909页

作者：于志刚王承州万小进权佳美杜俊辉郑旭林中国海洋石油有限公司湛江分公司广东湛江524057 东北石油大学石油工程学院黑龙江大庆163000

储层条件复杂、压力的高低只能宏观表示注入性的难易程度,微观上很难展示出药剂体系与储层渗透率的匹配关系。为满足油田深部液流转向技术需求,以WZ低孔低渗油藏为模拟对象,针对4种不同组分设计的分散调驱体系,对其微观聚集态、溶胀性... 详细信息

储层条件复杂、压力的高低只能宏观表示注入性的难易程度,微观上很难展示出药剂体系与储层渗透率的匹配关系。为满足油田深部液流转向技术需求,以WZ低孔低渗油藏为模拟对象,针对4种不同组分设计的分散调驱体系,对其微观聚集态、溶胀性能和压缩形变能力进行研究;同时考察了微球与人造岩心孔喉的匹配关系。结果表明:A和B具有低膨胀特性,主要依靠地层吸附产生封堵;C、D含有较多亲水性的官能团,微球内外能够形成有效的渗透压差,二者粒径膨胀7倍左右,具有良好的水化溶胀效果;C的杨氏模量均值1.5 GPa,在低孔低渗中易发生形变,易通过储层孔隙喉道,D的杨氏模量均值4.5 GPa,适合中高渗的调剖/封堵应用;最后确定了调驱体系颗粒在岩心内达到初步运移时的渗透率下限。

关键词：溶胀性能弹性模量匹配关系渗透率下限

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

KMLY型斜板浓密机沉降浓缩效果分析

引用

金属矿山 2000年第5期29卷 42-44页

作者：万小金昆明冶金研究院

分析介绍了KMLY型斜板浓密机沉降浓缩效果。分析表明KMLY型斜板浓密机可大大改善矿浆在浓密机内流动和分布特性 ,提高其容积利用系数 ;缩短了细颗粒沉降路径 ,加快了细颗粒沉降机会 ,提高了沉降效率 ;增加了数倍有效沉降面积 ,设备的处... 详细信息

分析介绍了KMLY型斜板浓密机沉降浓缩效果。分析表明KMLY型斜板浓密机可大大改善矿浆在浓密机内流动和分布特性 ,提高其容积利用系数 ;缩短了细颗粒沉降路径 ,加快了细颗粒沉降机会 ,提高了沉降效率 ;增加了数倍有效沉降面积 ,设备的处理能力可提高 3～ 6倍。

关键词：斜板浓密机浅层沉降浓缩效果浓缩机

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

散粮出仓组合式输送设备研制

引用

现代食品 2024年第10期30卷 8-11页

作者：张志伟万小进朱凌翔李首文郝嘉震汤凯凯江宏明杭州市粮食收储有限公司仁和分公司浙江杭州311107

散粮出仓组合式输送设备利用输送机的输出动力,在工作时通过前侧输送辊将动力传递给装抛装置的旋转轮盘。旋转轮盘与抛粮斗连在一起,在旋转轮盘惯性的作用下将物料抛向循环运行的输送机的后端,再由输送机将颗粒物输送到出仓设备上进行... 详细信息

散粮出仓组合式输送设备利用输送机的输出动力,在工作时通过前侧输送辊将动力传递给装抛装置的旋转轮盘。旋转轮盘与抛粮斗连在一起,在旋转轮盘惯性的作用下将物料抛向循环运行的输送机的后端,再由输送机将颗粒物输送到出仓设备上进行出仓作业。这种设计减少了设备的搭接,起到了节约能耗和降低成本的作用。

关键词：散粮输送装置装抛装置电控系统

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Operational Characteristics of Loop Heat Pipe in Microgravity and Normal Gravity Environments

引用

Journal of Thermal Science 2024年第4期33卷 1394-1408页

作者： ZHONG Siyuan XIE Rongjian LI Yunfei SUN xiaojin Shanghai Institution of Technology and Physics Shanghai200083China University of Chinese Academy of Sciences Beijing100049China Shanghai Institute of Satellite Engineering Shanghai200240China

The loop heat pipe(LHP)is an advanced,efficient two-phase heat transfer unit,whose operational performance may be affected by microgravity conditions in contrast to ground-based *** performance of on-orbit temperature data and ground test of a copper-propylene LHP with a condenser temperature range of 243.15 K to 303.15 K were employed to compared and *** LHP has successfully started up for more than 193 times with a good heat transfer performance and a stable start-up stabilization on-orbit under a complex orbital heating environment for more than eight *** a small heat load(10.0W),the average start-up time is 110.0 s while the start-up temperature ranges from 5.71 K-12.78 *** start-up time at large temperature differences in the high temperature zone will be higher than the time required for start-up at smaller temperature differences in the low *** the condenser temperature is 250.0 K,the stable temperature difference on orbit is 3.83 K,which is generally consistent in heat transfer compared to 2.20 K in the ground *** this paper,we can conclude that the on-orbit flight data up to now can provide a reference to the design of subsequent LHP space applications.

关键词： Loop Heat Pipe(LHP) start up microgravity on-orbit experiment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of the Particle Packing Configuration on Fixed Bed Performance

引用

China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 152-160页

作者： Li Ziqi Bao Di Zhou Han Tang xiaojin SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China

Fixed-bed reactors are generally considered the optimal choice for numerous multi-phase catalytic reactions due to their excellent performance and ***,conventional fixed beds often encounter challenges related to inadequate mass transfer and a high pressure drop caused by the non-uniform void fraction *** enhance the overall performance of fixed beds,the impact of different packing configurations on performance was *** and simulation methods were used to investigate the fluid flow and mass transfer performances of various packed beds under different flow *** was found that structured beds exhibited a significantly lower pressure drop per unit length than conventional packed ***,the packing configurations had a critical role in improving the overall performance of fixed ***,structured packed beds,particularly the H-2 packing configuration,effectively reduced the pressure drop per unit length and improved the mass transfer *** H-2 packing configuration consisted of two parallel strips of particles in each layer,with strips arranged perpendicularly between adjacent layers,and the spacing between the strips varied from layer to layer.

关键词： packing configurations fixed bed Computational Fluid Dynamics simulation pressure drop mass transfer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Outer-surface Covering of Nanochannels with Hydrogel for Highly Sensitive and Specific Cr(VI)Detection Through Analyte-caused Charge Change in Hydrogel

引用

Chemical Research in Chinese Universities 2024年第2期40卷 326-332页

作者： LIU Huan SUN Xueting DAI Yu ZHANG xiaojin XIA Fan Faculty of Materials Science and Chemistry China University of GeosciencesWuhan430074P.R.China

Nanochannels have made great progress and are a promising platform for detecting a series of ***,most nanochannels are modified on the inner wall,while ignoring the outer ***,we modified the outer surface of nanochannels with *** from other reported outer-surface modification methods,we directly cover nanochannels with hydrogel to form heterogeneous *** selected hydrogel hardly adsorbs other ions and shows specific adsorption for Cr(VI).The adsorption sites in hydrogel are homogeneous,and Cr(VI)adsorption onto hydrogel is endothermic and *** charge in hydrogel changes after Cr(VI)adsorption,and the resulting current changes can be used for the detection of Cr(VI)with the detection limit of 10−11 mol/*** platform is expected to be used for Cr(VI)detection in living organisms,especially within *** work provides a new approach for outer-surface modification of nanochannels and offers a new choice for nanochannel detection platforms.

关键词： Nanochannel Hydrogel Heterogeneous membrane Cr(VI)detection

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

抓取机械臂基于ART-RBF学习算法的运动学分析

引用

机械传动 2019年第2期43卷 112-117页

作者：王凯万小金现代汽车零部件技术湖北省重点实验室(武汉理工大学) 湖北武汉430070 汽车零部件技术湖北省协同创新中心湖北武汉430070

针对在研究抓取机械臂运动学逆解过程中所遇到的困难,计划选择一种基于软竞争机制的ART-RBF模型。在传统RBF神经网络的基础上,自适应控制生成隐含层节点数目,将相似度软竞争使用在第一阶段的学习中。采用软竞争机制,能够将隐含层各个节... 详细信息

针对在研究抓取机械臂运动学逆解过程中所遇到的困难,计划选择一种基于软竞争机制的ART-RBF模型。在传统RBF神经网络的基础上,自适应控制生成隐含层节点数目,将相似度软竞争使用在第一阶段的学习中。采用软竞争机制,能够将隐含层各个节点都参与到对样本的学习,节点利用率提高,同时也能够减少类间混叠处样本的误差,提高预测精度。最后,利用ADAMS对机械臂进行运动仿真,并与所得运动学正解相比较,用来验证正解方程的正确性。结果表明,该软竞争算法能够一定程度上提高预测精度,仿真结果表明了所得正解数据的准确性,为后续运动控制提供依据。

关键词：机械臂逆运动学软竞争 ART-RBF 运动仿真

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Intake of tobacco nitrosamines of smokers in various provinces of China and their cancer risk:A meta-analysis

引用

Journal of Environmental Sciences 2024年第7期141卷 249-260页

作者： Xiao Li Zhiwei Ye Jun wang Pengfei Lin xiaojin Zhang Shuguang Xie Chao Chen Research Institute for Environmental Innovation(Suzhou) TsinghuaSuzhouJiangsu 215163China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Shenzhen Key Laboratory of Organic Pollution Prevention and Control State Key Laboratory of Urban Water Resource and EnvironmentHarbin Institute of TechnologyShenzhen 518055China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Science and EngineeringPeking UniversityBeijing 100871China

Nitrosamines are a class of carcinogens which have been detected widely in food,water,some pharmaceuticals as well as *** objectives of this paper include reviewing the basic information on tobacco consumption and nitrosamine contents,and assessing the health risks of tobacco nitrosamines exposure to Chinese *** searched the publications in English from“Web of Science”and those in Chinese from the“China National Knowledge Infrastructure”in 2022 and collected 151 literatures with valid *** content of main nitrosamines in tobacco,including 4-(methylnitrosoamino)-1-(3-pyridyl)-1-butanone(NNK),N-nitrosonornicotine(NNN),N-nitrosoanatabine(NAT),N-nitrosoanabasine(NAB),total tobacco-specific nitrosamines(TSNA),and N-nitrosodimethylamine(NDMA)were *** information of daily tobacco consumption of smokers in 30 provinces of China was also ***,the intakes of NNN,NNK,NAT,NAB,TSNAs,and NDMA via tobacco smoke were estimated as 1534ng/day,591 ng/day,685 ng/day,81 ng/day,2543 ng/day,and 484 ng/day by adult smokers in30 provinces,*** cancer risk(CR)values for NNN and NNK inhalation intake were further calculated as 1.44×10^(-5)and 1.95×10^(-4).The CR value for NDMA intake via tobacco smoke(inhalation:1.66×10^(-4))indicates that NDMA is similarly dangerous in tobacco smoke when compared with the *** China,the CR values caused by average nitrosamines intake via various exposures and their order can be estimated as the following:smoke(3.75×10^(-4))>food(1.74×10^(-4))>drinking water(1.38×10^(-5)).Smokers in China averagely suffer 200%of extra cancer risk caused by nitrosamines in tobacco when compared with non-smokers.

关键词： N-nitrosamine Tobacco Cancer risk Tobacco specific nitrosamines(TSNAs) N-nitrosodimethylamine(NDMA)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：