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Modeling CO_2 miscible flooding for enhanced oil recovery

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Petroleum Science 2012年第2期9卷 192-198页

作者： Ju Binshan wu yu-shu Qin Jishun Fan Tailiang Li Zhiping School of Energy Resources China University of Geosciences(Beijing)Beijing100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism Ministry of EducationChinaUniversity of Geosciences(Beijing)Beijing 100083China Colorado School of Mines USA PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China

The injection of fuel-generated CO2 into oil reservoirs will lead to two benefits in both enhanced oil recovery （EOR） and the reduction in atmospheric emission of CO2. To get an insight into CO2 miscible flooding performance in oil reservoirs, a multi-compositional non-isothermal CO2 miscible flooding mathematical model is developed. The convection and diffusion of CO2-hydrocarbon mixtures in multiphase fluids in reservoirs, mass transfer between CO2 and crude, and formation damages caused by asphaltene precipitation are fully considered in the model. The governing equations are discretized in space using the integral finite difference method. The Newton-Raphson iterative technique was used to solve the nonlinear equation systems of mass and energy conservation. A numerical simulator, in which regular grids and irregular grids are optional, was developed for predicting CO2 miscible flooding processes. Two examples of one-dimensional （1D） regular and three-dimensional （3D） rectangle and polygonal grids are designed to demonstrate the functions of the simulator. Experimental data validate the developed simulator by comparison with 1D simulation results. The applications of the simulator indicate that it is feasible for predicting CO2 flooding in oil reservoirs for EOR.

关键词： Compositional simulator CO2 flooding mathematical model irregular grids

Gibbs自由能最小化法计算二氧化碳-烃-水系统相平衡

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石油学报 2015年第5期36卷 593-599页

作者：邸元张园 wu yu-shu 北京大学工学院北京100871 Petroleum Engineering Department Colorado School of Mines

油-气-水三相的相平衡计算是二氧化碳驱物性参数分析及数值模拟研究的核心问题之一。Gibbs自由能最小化法基于相平衡的热力学理论,适应性广、计算稳定,比较适合二氧化碳-烃-水系统的相平衡计算。通过引入相稳定性变量,采用拉格朗日乘数... 详细信息

油-气-水三相的相平衡计算是二氧化碳驱物性参数分析及数值模拟研究的核心问题之一。Gibbs自由能最小化法基于相平衡的热力学理论,适应性广、计算稳定,比较适合二氧化碳-烃-水系统的相平衡计算。通过引入相稳定性变量,采用拉格朗日乘数法计算多相多组分系统Gibbs自由能的最小化问题,由Newton-Raphson迭代法求解相应的控制方程。迭代计算时,二氧化碳和烃类组分气-油平衡常数的初值采用Wilson公式进行计算。气相和油相的状态方程采用SRK方程。分别计算了凝析气、酸气和二氧化碳-烃混合物3个算例的相平衡问题,计算值同实验实测值符合良好,验证了算法的准确性。分别对二氧化碳-烃系统和二氧化碳-烃-水系统算例的相平衡进行了计算,研究了一定温度和压力条件下,系统内二氧化碳和水的含量对烃类组分平衡常数的影响。

关键词：相平衡 Gibbs自由能最小化平衡常数多组分混合物二氧化碳

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影响阴茎癌患者术后预后因素的研究

中华男科学杂志 2024年第6期30卷 507-513页

作者：吴玉书张志磊祝涛李宗阳郭志凡臧运江山东第二医科大学临床医学院山东潍坊261041 潍坊市人民医院泌尿外科山东潍坊261041

目的:探讨影响阴茎癌术后预后的危险因素。方法:收集2013年1月1日至2023年12月31日潍坊市人民医院泌尿外科收治的阴茎癌患者的临床资料进行回顾性分析,并通过Kaplan-Meier法绘制生存曲线,利用χ^(2)检验或Fisher确切概率法比较不同分组... 详细信息

目的:探讨影响阴茎癌术后预后的危险因素。方法:收集2013年1月1日至2023年12月31日潍坊市人民医院泌尿外科收治的阴茎癌患者的临床资料进行回顾性分析,并通过Kaplan-Meier法绘制生存曲线,利用χ^(2)检验或Fisher确切概率法比较不同分组间的临床特征差异,采用单因素和多因素Cox风险回归分析预后危险因素,以确定肿瘤特异生存率(CSS)的独立预后危险因素。结果:共纳入112例患者,患者的1、3、5年的CSS分别为78.2%、66.1%、63.7%。各分组生存曲线经log-rank检验组间差异后发现,患者居住地到本医院距离、发现到入院持续时间、是否吸烟、临床淋巴结情况、肿瘤学历(P=0.043)、职业(P=0.001)、NLR(P<0.001)、LMR(P=0.002)、FIB(P=0.002)、T分期(P<0.001)、肿瘤分化情况(P=0.002)均可能为影响患者生存预后的重要因素。Kaplan-Meier分析结果表明:高中性粒细胞与淋巴细胞比值(NLR)预示着更差的CSS(P<0.001)。多因素Cox回归分析显示:高NLR(HR=2.6;95%CI:1.031~6.558;P=0.043)是CSS的独立危险因素。结论:术前NLR值是影响阴茎癌患者预后的独立危险因素。此外,年龄偏大、职业为农民或工人、学历较低、术前LMR≤2.81、术前FIB≥3.41(g/L)以及T分期较晚及肿瘤分化的患者预后较差。

关键词：阴茎癌 NLR 预后中性粒细胞与淋巴细胞比值肿瘤特异生存期

Construction of a Full-Length cDNA Library of Gossypium hirsutum L. and Identification of Two MADS-Box Genes

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Agricultural Sciences in China 2011年第1期10卷 28-40页

作者： WANG Li-na wu Dong yu shu-xun FAN shu-li SONG Mei-zhen PANG Chao-you LIU Jun-jie Cotton Research Institute Chinese Academy of Agricultural Sciences~Key Laboratory of Cotton Genetic Improvement Ministry of AgricultureAnyang 455000 P.R.China

A full-length normalized cDNA library for the flower development stages of short-season cotton （Gossypium hirsutum L.）（CCRI36） was constructed. A total of 3 421 clones were randomly selected for sequencing, with a total of 3 175 effective sequences obtained after removal of empty-carriers and low-quality sequences. Clustering the 3 175 high-quality expressed sequence tags （ESTs） resulted in a set of 2 906 non-redundant sequences comprised of 233 contigs and 2 673 singletons. Comparative analyses indicated that 913 （43.6%） of the unigenes had homologues with function-known genes or functionassumed genes in the National Center for Biotechnology Information. In addition, 763 （36.4%） of the unigenes were functionally classified using Gene Ontology hierarchy. Through EST alignment and the screening method, the full-length cDNA of two MADS-box genes viz., GhMADSll and GhMADS12 were acquired. These genes may play a role in flower development. Phylogenetie analysis indicated that GhMADS11 and GhMADS12 had high homology and close evolutionary relationship with AGL2/SEP-type and PI-type genes, respectively. The expression of both GhMADSll and GhMADS12, genes was high in reproductive organs. In floral organs, GhMADSll expression was high in petals （whor12） and ovules, while GhMADS12 expression was high in petals （whor12） and stamens （whor13）. Results show that the EST strategy based on a normalized cDNA library is an effective method for gene identification. The study provides more insights for future molecular research on the regulation mechanism of cotton flower development.

关键词： cotton normalized cDNA library EST MADS-box gene

Pd-catalyzed intermolecular Si–O formation via Si–C activation

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Science China Chemistry 2024年第8期67卷 2661-2669页

作者： shuang Liu yu-shu Chen Yichen wu Peng Wang State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesShanghai 200032China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China College of Material Chemistry and Chemical Engineering Key Laboratory of Organosilicon Chemistryand Material Technology of Ministry of EducationHangzhou Normal UniversityHangzhou 311121China

The development of efficient Si–O bond formation reaction with 100% atom-economy, excellent functional group tolerance, and broad scope under mild conditions is highly desired due to the prevalence of silanol, silyl ether, and their derivatives in synthetic chemistry and materials science. Here, we have realized the Pd-catalyzed Si–O formation reaction via a Si–C activation approach with 100% atom-economy by employing silacyclobutanes(SCBs) and various hydroxy-containing substrates, including water,alcohols, phenols, and silanols. This protocol features a broad substrate scope, remarkable functional compatibility and mild conditions, providing a series of silanols, silyl ethers in high efficiency. Notably, this protocol could also be used for selective protection of hydroxy functionalities, and for the access of a class of novel polymers containing Si–O main chain. Preliminary mechanistic studies unveiled that this reaction underwent a Pd-catalyzed concerted ring-opening mechanism.

关键词： Si–O formation Si–C activation palladium silacyclobutane silanol silyl ether

Progress in preparation of AlN-reinforced magnesium matrix composites:A review

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China Foundry 2024年第1期21卷 1-10页

作者： Lu Chen shu-lin Lü Di-jia Zhao Wei Guo Jian-yu Li shu-sen wu State Key Lab of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

As a ceramic material,AlN has very good thermophysical and mechanical *** addition,AlN is an effective refining agent for Mg alloys because it has a lattice constant similar to that of ***,AlN is an ideal reinforcement for magnesium matrix composites(MMCs),and is attracting increasing *** review addresses the development of preparation technologies for AlN-reinforced Mg matrix *** mainstream preparation techniques include stir casting,melt infiltration,powder metallurgy,and in-situ *** addition,the advantages and disadvantages of these techniques are analyzed in depth,and it is pointed out that the next direction for the preparation of high-performance AlN-reinforced MMCs is less aluminization and multiple technologies integration.

关键词： AlN MMCs preparation thermophysical property mechanical property

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复杂多孔介质多重介质模型的表征单元体

工程力学 2015年第12期32卷 33-39页

作者：邸元康志江代亚非 wu yu-shu 北京大学工学院北京100871 中国石油化工股份有限公司石油勘探开发研究院北京100083 科罗拉多矿业大学石油工程系美国co80401

裂缝性岩体及缝洞型碳酸盐岩储层属于复杂多孔介质,岩体内部空隙为从纳米或微米级的微孔隙到数十厘米以上的大裂缝和溶蚀孔洞,空隙尺度跨越的范围很大。对于很多实际问题,由于单重介质模型计算不准确,且又不可能对复杂空隙空间结构在微... 详细信息

裂缝性岩体及缝洞型碳酸盐岩储层属于复杂多孔介质,岩体内部空隙为从纳米或微米级的微孔隙到数十厘米以上的大裂缝和溶蚀孔洞,空隙尺度跨越的范围很大。对于很多实际问题,由于单重介质模型计算不准确,且又不可能对复杂空隙空间结构在微观水平上进行精确描述,因此只能应用多重连续介质方法研究复杂多孔介质中的输运问题。该文给出了多重介质模型表征单元体的定义。在所研究问题的尺度范围内,这一多重介质模型表征单元体存在,复杂多孔介质的多重连续介质理论才能够成立。还以孔隙度和渗透率作为相关状态变量进行分析,研究了单重介质模型表征单元体和多重介质模型表征单元体间的联系,给出了复杂多孔介质多重介质模型的建立方法。

关键词：多孔介质三重介质模型多重介质模型表征单元体连续介质方法缝洞型油藏

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缝洞型多孔介质中多相流的有限体积法数值模拟

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计算力学学报 2013年第S1期30卷 144-149页

作者：邸元彭浪 wu yu-shu 康志江北京大学工学院北京100871 美国科罗拉多矿业大学石油工程系 co80401 中国石油化工股份有限公司石油勘探开发研究院北京100083

本文研究的碳酸盐岩油藏储集体属于缝洞型多孔介质。这类缝洞型多孔介质由裂缝、溶蚀孔洞和低孔隙度低渗透率的基岩组成.裂缝是空隙流体流动的主要通道;溶蚀孔洞大小从几厘米到数米不等,渗透率和孔隙度都很高,是流体主要的储集空间。由... 详细信息

本文研究的碳酸盐岩油藏储集体属于缝洞型多孔介质。这类缝洞型多孔介质由裂缝、溶蚀孔洞和低孔隙度低渗透率的基岩组成.裂缝是空隙流体流动的主要通道;溶蚀孔洞大小从几厘米到数米不等,渗透率和孔隙度都很高,是流体主要的储集空间。由于缝洞型多孔介质空隙空间的复杂性和强非均质性,数值计算中基本控制方程的空间离散应采用非结构化网格的计算模型。本文采用有限体积法模拟缝洞型多孔介质中多相流体的流动,并给出了相应的单元中心格式有限体积法的计算公式。裂缝介质和溶洞介质中单元间多相流体的流动考虑为高速非达西流,其质量通量采用Forchheimer定律计算。非线性方程的离散选取全隐式格式,并采用Newton-Raphson迭代进行求解。通过两个二维模型注水驱油的数值模拟,验证了本文方法的有效性.

关键词：缝洞型油藏多孔介质有限体积法油藏模拟非达西流

Advancements in animal nutrition: The interplay of feed enzymes, gut health, and nutrient supply in poultry and pig production——A tribute to Professor Mingan Choct's 30-year scientific legacy

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Animal Nutrition 2024年第2期17卷 373-375页

作者： shu-Biao wu School of Environmental and Rural Science University of New England

Animal production is a significant protein source for human consumption(Salter and Lopez-Viso, 2021). The production of monogastric animals has grown enormously in recent decades,particularly of poultry and swine(Rauw et al., 2020). Such growth is attributed to the progress in animal nutrition, disease control,and genetic improvement in response to the global demand for meat(Kumar et al., 2023) and, of course, the tireless efforts of scientists working in the area for the past decades. Among them is Professor Mingan Choct, a monogastric animal nutritionist at the University of New England. He has dedicated his entire academic career to the field, significantly contributing to monogastric animal research and industry. To honour his contribution and celebrate his retirement, we organized a special issue in Animal Nutrition with contributions from a group of prominent researchers in monogastric animal nutrition and health. In this special issue, we published reviews and research papers, 8 in total, with a focus on the nutrition and health of monogastric production animals.

关键词： BROILER-CHICKENS WHEAT PENTOSANS NET ENERGY FUNCTIONAL INTERACTIONS MANNO-OLIGOSACCHARIDES GROWTH-PERFORMANCE DIETARY THREONINE SUPPLEMENTATION