旋转井壁取芯器钻头性能探讨

介绍了旋转井壁取芯器钻头的工作原理和结构特点。将12种取芯钻头的各项技术参数进行综合对比。为了确定每种钻头对不同岩性地层的适用性能,设计了模拟地层取芯的实验。采集12种取芯钻头分别在0~40公斤的钻压下对五种不同岩石样本(石灰岩、花岗岩、粗砂岩、细砂岩和泥质砂岩)进行模拟取芯的实验数据。将实时记录的扭矩、钻速和功率的变化曲线配合每种钻头的各项性能参数逐一进行分析,最终获得每种钻头的适用性能星级评定表,为一线的旋转井壁取芯作业提供帮助。     

川南硬脆性页岩井壁失稳机理实验研究

川南地区是我国最早开发页岩气的地区,肩负着推动我国页岩气发展的重要任务。但是川南地区页岩气藏钻井过程中井壁垮塌严重,影响了该地区页岩气藏的勘探开发进程。基于现场取芯室内实验,从微观结构、矿物组分及流体对岩石物性的影响,对该地区页岩进行研究。分析了硬脆性页岩稳定性。得出该地层井壁失稳机理主要是在井筒压差以及毛管力作用下钻井液滤液沿层理面渗入,导致层理面的力学性质发生变化,从而引起页岩整体强度下降出现剥落,最终造成井壁失稳垮塌。通过对该区块页岩实验研究分析,为该地区页岩钻井过程中钻井液优选提供有效的理论支撑,确保页岩层段钻进高效、顺利地进行。     

一种新型油田井壁取芯供电电源研究

本文对油田井壁取芯马达电机的供电电源进行了研究,提出了一种基于光纤传输的马达电机供电方式。介绍了系统的实现方案及工作原理,并给出了实验波形。实验结果表明,该系统克服了传统的油田测井电源方案的诸多缺点,具有性能稳定可靠、起动电流小、智能化程度高等优点。     

东海W6—1—1井第三系砂岩胶结物的成岩变化

依据对Ｗ６－６－６井采集到的第三系的岩芯及井壁取芯样品的观测与分析，探讨砂岩的胶结物组分在成岩过程中的形成溶蚀及其成因机理。     

ICS-DT系列定量给料系统的研制

ICS—DT系列定量给料机控制仪系统，可实现对各种物料进行连续或断续的控制和计量，根据工艺配比进行给料控制；广泛使用于建材、化工、冶金、电力等行业。ICS—DT系列定量给料机控制仪采用微型可编程控制器进行计量控制全中文界面，控制可靠，操作人性化，易于掌握；ICS—DT系列定量给料机控制仪可以配用不同的传感器和计量机械设备，构成定量给料机，固体流量计等。     

汽车压缩天然气液体加热器控制仪的研制

在系统分析以天然气为能源的汽车液体加热器工作过程的基础上，提出了汽车压缩天然气（CNG）液体加热器控制仪的主要功能和技术指标。采用具有ARM7内核的LPC2119嵌入式控制器作为控制仪的控制核心，运用模糊控制方法自动调节汽车厢体温度，同时对车厢温度、出水温度、气体泄漏、火焰状况和电源电压等参数进行监测。介绍了控制仪的工作原理、硬件构成和系统软件设计。样机试验表明：控制仪控制下的加热器运行稳定可靠，整机性价比高，排放低，与原机相比，运行费用降低约45％。     

地层沉陷时井壁承受竖向附加力的有限元分析

通过对淮北、徐州等矿区井壁发生破坏情况的分析，指出了竖向附加力是导致井壁破坏的根源。编制了井壁结构空间轴对称问题弹塑性有限元程序，并采用它对上述破坏井壁进行了计算分析，得到了地层沉陷时井壁承受竖向附加力的数值，从而可为井壁设计提供参考依据     

高精度智能温度控制仪微控制电路设计

本文介绍了一种水浴器精密温控制仪的设计方法。并对该控制仪的微处理器控制电路的电路原理,结构特点及软件设计方法进行了研究。     

基于PIC16C73芯片的水温水位控制仪的设计

介绍了以PIC16C73单片机为核心的太阳能热水器水温水位控制仪的主要功能和工作原理，给出了硬件电路．该控制仪结构简单可靠、功能全面，可以实现太阳能热水器的辅助电加热及多功能智能化控制，有良好的应用前景．     

疏松砂岩储层裸眼完井可行性评价——以胜坨油田二区沙二段储层为例

完井方式的选择对油气田开发至关重要，裸眼完井具有简单、方便、成本低和产量高等优势，但也容易发生井壁失稳，特别是对于疏松砂岩储层而言，因此在确定采用裸眼完井之前，必须先对其在目标储层的可行性进行评价。本文以胜坨油田二区沙二段储层为例进行研究，该层段为一套疏松砂岩储层，胶结程度不高，为确定其裸眼完井是否可行，本文在 公式法的基础上，考虑油气渗流所引起的附加应力，建立了井壁岩石周向应力的计算方法，提出了改进后的井壁稳定性评价模型。根据目标储层现有地质、测井及测试及室内实验方法获得的资料，应用上述模型，进行了目标储层井壁稳定性评价，并进一步分析了井斜角度、压力衰减和储层产水三个因素对井壁失稳的影响，与现有完井方式进行了对比分析，得出胜坨油田二区沙二段储层裸眼完井是不可行的认识，应采用套管完井并辅以防砂固井等措施。该结论对于其它疏松砂岩储层同样适用。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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