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Influence of Wellbore Trajectory on Pressure Drop and Fluid Discharge

Fluid Dynamics & Materials Processing 2023年第8期19卷 2053-2066页

作者： Ruidong Wu Guowei Wang Zhixing Yang Ruiquan Liao Yang Cheng Shanghai Branch of CNOOC(China)Co. Ltd.Shanghai200335 CNPC Key Laboratory of Oil and Gas Productions on Yangtze University Jingzhou434023China Petrochina Multiphase Flow Laboratory of Gas Lift Innovation Center Wuhan430100China Petroleum Engineering College of Yangtze University Wuhan430100China

An experimental analysis has been conducted to study the process of fluid accumulation for different borehole trajectories.More specifically,five heel angles have been experimentally realized to simulate the borehole trajectory of the sloping section of the formation.The fluid-carrying capacity,pressure drop and fluid discharge volatility have been investigated for these conditions and,accordingly,the relationship between heel angle and wellbore pressure drop fluid-carrying capacity has been determined.The results show that while the reasonable roll angle can increase the pressure loss in the wellbore,it is beneficial to drainage.In terms of pressure loss and liquid-carrying capacity,when the heeling angle is 50°,the latter is increased while the former becomes very high,which indicates that when drilling and completing wells on site,a 50°roll angle should be avoided.It is found that the main reason for the increase of the total pressure drop in the wellbore is the increase of the local pressure loss in the inclined section.From the perspective of drainage stability,when there is heeling in the inclined section of the horizontal well,the fluctuation of the wellbore drainage tends to be enhanced.Through the comparison of the Beggs-Brill(B-B)and Mukherjee-Brill liquid holdup methods,it is found that B-B method better predicts liquid holdup.A new method for calculating the pressure drop in the inclined section in the presence of lateral inclination is obtained by taking into account the pressure drop in the curved section.Through comparison with experimental data,it is found that the error is within 20%,and the prediction accuracy is high.

关键词： Horizontal well slant section heel angle pressure drop drainage quantity

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Research and Prediction on the Properties of Concrete at Cryogenic Temperature Based on Gray Theory

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Journal of wuhan University of Technology(Materials Science) 2023年第5期38卷 1056-1064页

作者： ZHOU Dawei LIU Juanhong CHENG Linian wu ruidong ZOU Min WANG Jiahao School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Research Institute of Urbanization and Urban Safety University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Urban Underground Space Engineering University of Science and Technology BeijingBeijing 100083China

To solve the cryogenic temperature problems faced by all-concrete liquefied natural gas(ACLNG)storage tanks during servicing,a low temperature resistant and high strength concrete(LHC)was designed from the perspectives of reducing water-binder ratio,removing coarse aggregates,optimizing composite mineral admixture and utilizing steel fibers.The variation laws of compressive and tensile strength,elastic modulus and Poisson’s ratio for C60 concrete and LHC were compared and analyzed under the temperatures from 10 to-165℃through uniaxial compression and tensile tests.The rapid freezing method was adopted to analyze the evolution process of mass and relative dynamic elastic modulus loss rates for C60 and LHC in 0-300 freeze-thaw cycles.The gas permeability test was carried out,and the laws of gas permeability coefficient varied with temperature and cryogenic freeze-thaw cycles were obtained.Then,the grey dynamic model GM(1,1)was used to predict the variation laws of physical and mechanical parameters on the basis of the test data.The test results demonstrate that the compressive strength,elastic modulus and Poisson’s ratio for both C60 and LHC increase significantly from 10 to-165℃,but the specific variation laws are difierent,and there is a phenomenon that some parameters decrease after reaching a critical temperature range for C60.The uniaxial tensile strength increases first and then decreases as temperature decreases,and finally increases slightly at-165℃for both C60 and LHC.The mass and relative dynamic elastic modulus loss rates of LHC are much lower than that of C60 under different freeze-thaw cycles.The gas permeability coefficient of C60 declines gradually with the drop of temperature,and increases gradually with the number of freeze-thaw cycles while the gas permeability coefficient of LHC basically remains stable and is much lower than that of C60.Therefore,such a conclusion can be drawn that LHC has better properties at cryogenic temperature.On the premise of providing consistent functional mode,GM(1,1)ca

关键词： concrete cryogenic temperature freeze-thaw cycles mechanical properties gas permeability coefficient grey theory

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SSDBA:the stretch shrink distance based algorithm for link prediction in social networks

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Frontiers of Computer Science 2021年第1期15卷 69-80页

作者： ruidong YAN Yi LI Deying LI Weili wu Yongcai WANG School of Information Renmin University of ChinaBeijing 100872China Department of Computer Science University of Texas at DallasRichardsonTexas 75080USA

In the field of social network analysis,Link Predic-tion is one of the hottest topics which has been attracted attentions in academia and industry.So far,literatures for solving link prediction can be roughly divided into two categories:similarity-based and learning-based methods.The learning-based methods have higher accuracy,but their time complexities are too high for complex networks.However,the similarity-based methods have the advantage of low time consumption,so improving their accuracy becomes a key issue.In this paper,we employ community structures of social networks to improve the prediction accuracy and propose the stretch shrink distance based algorithm(SSDBA),In SSDBA,we first detect communities of a social network and identify active nodes based on community average threshold(CAT)and node average threshold(NAT)in each community.Second,we propose the stretch shrink distance(SSD)model to iteratively calculate the changes of distances between active nodes and their local neighbors.Finally,we make predictions when these links'distances tend to converge.Furthermore,extensive parameters learning have been carried out in experiments.We compare our SSDBA with other popular approaches.Experimental results validate the effectiveness and efficiency of proposed algorithm.

关键词： link prediction social network stretch shrink distance model dynamic distance community detection

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Home range and seasonality of Yunnan snub-nosed monkeys

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Integrative Zoology 2009年第2期4卷 162-171页

作者： Baoping REN Ming LI Yongcheng LONG Ruidong Wu Fuwen WEI Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijingChina The Nature Conservancy China ProgramKunmingYunnanChina

Home range studies are essential for understanding an animal’s behavioral ecology and for making wildlife conservation efficient.The home range of a group of Yunnan snub-nosed monkeys(Rhinopithecus bieti Milne-Edwards,1897)was estimated using a global positioning system collar from December 2003 to October 2004 in northern Yunnan Province,China.To measure the ranging area of the study group 1291 animal locations were fixed.Based on the 100%minimum convex polygon method,the home range size was approximately 32.8 km2;based on the grid-cell method it was approximately 17.8 km2 using a 250-m grid and 23.3 km2 using a 500-m grid.We assessed seasonal changes in the home range of this monkey population and found a different ranging pattern of from earlier studies.Daily range size was calculated as 4.80±5.81 ha(mean±standard deviation),with a range of 45.66 ha(0.01–45.67 ha).

关键词： collar conservation global positioning system home range Rhinopithecus bieti.

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基于RBFNN代理模型的高速机车横向动力学性能多目标优化

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中南大学学报（自然科学版） 2023年第4期54卷 1644-1652页

作者：吴锐东姚远李广西南交通大学牵引动力国家重点实验室四川成都610031

针对高速机车横向动力学中的悬挂参数优化问题,首先,以国内某型2B0轴式高速机车为基础,采用SIMPACK软件建立该机车动力学模型;其次,以蛇行稳定性和横向平稳性指标为优化目标,同时兼顾新轮和磨耗轮2种轮轨接触状态,通过拉丁超立方试验设... 详细信息

针对高速机车横向动力学中的悬挂参数优化问题,首先,以国内某型2B0轴式高速机车为基础,采用SIMPACK软件建立该机车动力学模型;其次,以蛇行稳定性和横向平稳性指标为优化目标,同时兼顾新轮和磨耗轮2种轮轨接触状态,通过拉丁超立方试验设计方法对关键悬挂参数进行采样设计;最后,根据试验设计结果构建转向架悬挂参数映射到机车横向动力学性能的RBFNN代理模型,并利用Sobol敏感性和Pearson相关性分析方法来量化悬挂参数对优化目标的影响程度。研究结果表明:在参数给定优化范围内,机车横向动力学性能几乎不受二系横向减振器节点刚度变化的影响;而蛇行稳定性对一系纵向刚度、抗蛇行减振器节点刚度以及抗蛇行减振器阻尼较敏感,前后司机室横向平稳性对二系横向刚度最敏感,在高速机车转向架设计中应该给予重视。此外,将代理模型结合遗传算法NSGA-Ⅲ搭建快速多目标优化平台,并通过动力学仿真结果验证该平台的准确性,可有效替代车辆系统动力学模型仿真计算及优化。

关键词：高速机车蛇行稳定性横向平稳性代理模型多目标优化

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New macroalgal fossils of the Kaili Biota in Guizhou Province, China

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Science China Earth Sciences 2011年第1期54卷 93-100页

作者： wu MengYin ZHAO YuanLong TONG JinNan YANG ruidong Key Laboratory of Biogeology and Environmental Geology of Ministry of Education China University of Geosciences Wuhan 430074 China Department of Political Education Guiyang College Guiyang 550005 China College of Resource and Environment Guizhou University Guiyang 550004 China Key Laboratory of Karst Environment and Geohazard Prevention of Ministry of Education Guizhou University Guiyang 550004 China

The Kaili Biota of Jianhe County, Guizhou Province is found in a Burgess Shale type of deposits, and as such it provides a key fossil record for studying biotic differentiation following the Cambrian explosion. Macroalgae represent several important groups of primary producers and yet have not been well studied. Here, we report two new forms of macroalgae from the Kaili Biota, including a new genus and species and an indeterminate genus and species. The new genus and species, Parallelphyton tipica, is a heterotrichous alga with thalli composed of a prostrate cardinal axis, and parallel bundles of erect trichomes on the axis. The bifurcation of the trichomes is somewhat similar to the living heterotrichous Fritschiella (Chlorophyta), representing "architectonic differentiation" only known in higher plants as an adaptation to terrestrial conditions. The indeterminate genus and species consists of an arched, thick, cylindrical major shaft and irregularly spaced, curved lateral branches attached to the major shaft and subdivided into subbranches. The characteristics of the thick and strong major shaft and the lateral branch subdivided branches are analogous to the dichotomous branching of Psilophyton in Protopteridophyta. Thus, the differentiation of the thalli in these two algal forms represents the expression of properties of some higher metaphytes, indicating that the ecological differentiation of the macroalgae was well underway at the time of the Kaili Biota.

关键词：凯里生物群藻类化石贵州省新中国寒武纪生命大爆发矿床类型化石记录高等植物

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Co-combustion of municipal solid waste and coal gangue in a circulating fluidized bed combustor

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International Journal of Coal Science & Technology 2019年第2期6卷 218-224页

作者： Jianguang Qin ruidong Zhao Tianju Chen Zhongyue Zi Jinhu wu Key Laboratory of Biofuel Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China

Mixed incineration of municipal solid waste (MSW) in existing coal gangue power plant is a potentially highefficiency and low-cost MSW disposal way. In this paper, the co-combustion and pollutants emission characteristic of MSW and coal gangue was investigated in a circulating fluidized bed (CFB) combustor. The effect of MSW blend ratio, bed temperature and excess air ratio was detailedly studied. The results show the NOX and HC1 emission increases with the increasing MSW blend ratio and the SO2 emission decreases. With the increase of bed temperature, the CO emission decreases while the NOX and SO2 emission increases. The HC1 emission is nearly stable in the temperature range of 850-950℃. The increase of excess air ratio gradually increases the NOX emission but has no significant effect on the SO2 emission. The HC1 emission firstly increases and then decreases with the increase of excess air ratio. For a typical CFB operating condition with excess air ratio of 1.4, bed temperature of 900℃ and MSW blend ratio of 10%, the original CO, NOX, SO2 and HC1 emissions are 52, 181, 3373 and 58 mg/Nm^3 respectively.

关键词： Municipal solid waste Coal gangue Co-combustion Circulating fluidized bed

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Quantitative monitoring of minimal residual disease in childhood acute lymphoblastic leukemia using TEL-AML1 fusion transcript as a marker

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Pediatric Investigation 2018年第4期2卷 223-229页

作者： Xiaoxi Zhao Chao Gao Lei Cui Weijing Li Shuguang Liu ruidong Zhang Yi Liu Minyuan wu Zhigang Li Beijing Key Laboratory of Pediatric Hematology Oncology National Key Discipline of Pediatrics (Capital Medical University)Key Laboratory of Major Diseases in ChildrenMinistry of EducationHematology Oncology CenterBeijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijingChina Hematology & Oncology Laboratory Beijing Pediatric Research InstituteBeijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijing Key Laboratory of Pediatric Hematology OncologyKey Laboratory of Major Diseases in ChildrenMinistry of EducationNational Key Discipline of PediatricsMinistry of EducationBeijingChina

Importance: By demonstrating with TEL-AML1, this study indicated that mRNAs transcribed from fusion genes are ideal targets for minimal residual disease (MRD) monitoring in childhood acute lymphoblastic leukemia, and that different thresholds are needed to apply them into the risk stratification. Objective: TEL-AML1 expression was measured at three time points to 1) determine cut-off values for predicting acute lymphoblastic leukemia (ALL) relapse;2) investigate the prognostic value of this method and how well the results at these time points correlated;3) determine the correlation between MRD levels assessed using this marker and that determined by immunoglobulin/T-cell receptor (Ig/TCR) rearrangement detection. Methods: TEL-AML1 expression in 62 children with ALL was quantitated by real-time quantitative PCR at day 15, day 33, and month 3. The relationship between patient outcome and TEL-AML1 level was analyzed at each time point. The correlation between the MRD levels determined by TEL-AML1 or Ig/TCR rearrangements was also analyzed. results: For day 33, 6.68 TEL-AML1 copies/104 ABL copies was determined to be the best cut-off value. Higher levels were correlated with relapse (P = 0.001). For day 15 and month 3, the best cut-off values were 336.5 and 0.85 copies/104 ABL copies respectively;patients with higher expression levels had lower RFSs (day 15: P = 0.027;month 3:P = 0.023). For days 15 and 33, MRD levels assessed using TEL-AML1 or Ig/TCR rearrangements were strongly correlated [Spearman rank correlation coefficient (ρ) = 0.729 (day 15), 0.719 (day 33);P < 0.001 (both)], and both methods were equally effective at predicting relapse. At month 3, there was moderate correlation between the results derived from the two markers (ρ = 0.418, P = 0.003);however, receiver operating characteristic curve analysis showed that TEL-AML1 was a better prognostic marker. Interpretation: TEL-AML1 is an effective marker for MRD assessment and relapse prediction in children with ALL.

关键词： Childhood leukemia Fusion transcript Minimal residual disease

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海上凝析气藏反凝析污染特征及开采策略研究

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长江大学学报（自然科学版） 2024年第3期21卷 62-68页

作者：路颖伍锐东中海石油(中国)有限公司上海分公司上海200030

针对海上P气田因反凝析污染导致有效渗透率、无阻流量下降的问题,以气藏流体相态变化特征、单井生产动态数据、现场实际动态监测等资料为基础,通过Eclipse建立径向网格模型,分析不同开发阶段凝析油在地层中的分布规律,在不同凝析油含量... 详细信息

针对海上P气田因反凝析污染导致有效渗透率、无阻流量下降的问题,以气藏流体相态变化特征、单井生产动态数据、现场实际动态监测等资料为基础,通过Eclipse建立径向网格模型,分析不同开发阶段凝析油在地层中的分布规律,在不同凝析油含量、储层物性的条件下,研究反凝析现象对储层污染的影响。研究结果表明,对于凝析油含量较高的凝析气藏,开发后期有效渗透率伤害率可达42%,无阻流量下降率可达51%;凝析油含量越高,地层中凝析油饱和度越高、凝析油的污染范围就越大;储层渗透率越低,凝析油的相对渗透率越差,近井地带污染程度越严重。应用此结果制定的P气田3井次注气吞吐方案,可有效提高单井日产油近两倍。现场试验证实,注气吞吐可有效恢复地层压力,减缓凝析油污染,恢复气井产能,最终提高海上凝析气藏凝析油采收率。

关键词：反凝析污染凝析气藏径向网格模型注气吞吐

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利用二元回归计算天然气体积系数的新方法

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天然气与石油 2017年第4期35卷 79-82页

作者：伍锐东中海石油(中国)有限公司上海分公司上海200335

由于高昂的海上作业成本,海上新发现气田在储量评价过程中通常不会进行大量的流体分析化验,在如何确定天然气体积系数这一问题上,目前常用的做法是对主力气藏进行天然气偏差系数与体积系数实验分析,其它气藏则借用该气藏实验结果,此种... 详细信息

由于高昂的海上作业成本,海上新发现气田在储量评价过程中通常不会进行大量的流体分析化验,在如何确定天然气体积系数这一问题上,目前常用的做法是对主力气藏进行天然气偏差系数与体积系数实验分析,其它气藏则借用该气藏实验结果,此种处理方式势必导致储量计算存在较大误差。通过对现有实验数据中天然气偏差系数与温度、压力的关系分析,采用二元回归的方式得到了天然气偏差因子的计算新方法,该方法计算出的天然气体积系数与实测值之间的误差不超过2,较以往方法大幅降低,使储量评价更精确、更合理,具有一定的推广应用价值。

关键词：偏差因子体积系数二元回归

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