稠油油藏聚驱后二元复合驱提高采收率研究

针对古城油田泌123断块稠油油藏条件,考察了SP二元复合体系的最佳配方、乳化性和热稳定性,并用最佳配方的SP二元复合体系进行了聚合物驱后复合驱替实验。实验结果表明,得到的最佳SP二元复合体系（2000 mg/L ZL-I＋3000 mg/L OCSB）的黏度为59.5 mPa.s、界面张力7.87×10-3 mN/m,与聚合物溶液相比,黏度上升2 mPa.s、界面张力下降3～4个数量级,毛管数大幅度提高,具备更大幅度提高采收率的能力。SP二元复合体系与原油形成的乳化液黏度大于二元体系的黏度,乳化作用良好,可以进一步改善流度比。60℃下老化120天后SP二元复合体系中HPAM的水解度缓慢上升后维持在30%～40%,黏度始终保持平稳上升,变化规律与单一聚合物溶液相似;界面张力值在老化期间上升半个数量级以内,盐析程度较单一表面活性剂溶液大幅改善。岩心驱油实验表明,聚合物驱后进行二元复合驱可提高采收率10%OOIP以上,说明古城油田泌123断块稠油油藏采用二元复合驱作为聚合物驱后提高采收率的接替技术是可行的。图4表3参5     

Study on Polymerization Conditions and Structure of Poly(phenylene Sulfide Sulfone)

High molecular weight linear poly(phenylene sulfide sulfone)s (PPSS) were prepared by aromatic nucleophilic substitution reaction at atmospheric pressure. Influences of various polymerization conditions, such as solvent, catalyst, molar ratio, reaction temperature and time, on the molecular weight of PPSS were examined. The intrinsic viscosity of PPSS obtained under optimum synthesis conditions according to orthogonal experiments was 0.55 dl/g. The results of FT-IR, ¹H-NMR, UV spectrum and Raman spectrum confirmed the linear chain nature of product. The maximum UV absorption of PPSS increased with the increase of its intrinsic viscosity. X-ray diffraction and SALS studies indicated that some local ordered structures formed in the samples annealed between 220 ^○C∼240 ^○C for 4 h. The improvement in thermal performance of PPSS of high molecular weight was confirmed by DSC and TGA experiments.     

SnS@Ti_3C_2复合材料的制备及其储锂性能研究

MXene是一类新型二维过渡金属碳化物晶体,该类材料具有一些优异的性质,如高的电导率、低的锂离子扩散能垒、独特的金属离子吸附特性等等,但是,作为锂离子电极材料时,MXene材料容量较低,限制了它在锂离子电池领域的进一步应用。本文以Ti_3C_2(最具代表性的一种MXene材料)为基体材料,通过液相插层、水热合成以及高温热处理,成功制备出二维SnS@Ti_3C_2复合材料。研究发现,当Ti_3C_2:L-半胱氨酸的质量比为1:3时(L-半胱氨酸:Na2Sn O3·4H2O=1:4),合成出来的Sn S@Ti_3C_2在0.1 A×g~(-1)的电流密度下循环50次之后,容量达到735.8 m Ah×g~(-1),且保持稳定;在3 A×g~(-1)的电流密度下,其容量能达到525.4 m Ah g~(-1);而当电流恢复到0.1 A×g~(-1)时,其容量能恢复到689.2 m Ah×g~(-1),展现出了优异的倍率性能。     

S7-22×PLC在扭矩仪系统开发中的应用

介绍了扭矩仪以及S7-22×PLC在该系统开发中的应用。根据系统功能要求分析和介绍了系统的控制功能图、系统软件编程思路以及PLC程序功能模块。在开发中主要采用了基于PC的控制系统,但是PC机不能直接驱动电机,需要借助于PLC或单片机。而后两者在数据处理、存储、显示等方面的功能又不及前者。实践中采用了PLC。自由口协议就是在自由口模式下用户可以自己定义协议来与其他智能设备进行通信。自由口模式支持ASCII和二进制协议,实践中采用了ASCII协议,即通信中发送的是ASCII码。自由口通信把PC机和PLC的优点结合在了一起,只需要PC机向PLC发送相关指令,PLC即可按照要求去驱动电机。而这并不妨碍数据采集和处理模块的并行运行,提高了系统的可靠性和响应及时性。     

基于步进电机的CCD无接触测量仪

论述了用先进的CCD光电接收技术,实现对空间三维物体的跟踪和非接触式测量的方法,设计出一套能自动连续测量工件的长度、宽度、厚度的高精度测量系统,论文详细地阐述了该仪器的各个组成部分的设计思想和具体实现方法。其主要内容包括CCD器件测量的原理,信号的获得及处理方法,控制系统、软件及步进电机的设计等。     

Influence of Critical Current Density Distribution on Transport AC Losses for Round Superconducting Wire

The AC loss per cycle per unit length of a round superconducting wire has been theoretically analyzed based on the critical state model and numerically calculated from the power-law model. By using Bean’s critical state model, it is found that the distribution of critical current density J _c which increases from the center to the edge along a radial direction lowers the loss value. And the sharper the J _c varies, the more significant the loss reduction. After considering the coupling of thermoelectric interaction, the results show that the temperature in superconducting wires gradually increases and finally becomes stable. The temperature of stable state has a dependence on the J _c distribution and the rise of temperature has an important effect on the AC loss behavior.     

圆柱螺旋弹簧疲劳试验机的开发

弹簧的疲劳试验是弹簧性能检测的关键工序,特别是汽车悬架弹簧、摩托车减震弹簧、发动机气门等关键弹簧,必须做弹簧产品疲劳性能的可靠性评定.但根据弹簧的不同要求,试验时采用的频率、振幅等也有不同的要求.针对这种情况,开发研制了圆柱螺旋弹簧疲劳试验机.     

CDM:Content Diffusion Model for Information-Centric Networks

This paper proposes the Content Diffusion Model(CDM) for modeling the content diffusion process in information-centric networking(ICN).CDM is inspired by the epidemic model and it provides a method of theoretical quantitative analysis for the content diffusion process in ICN.Specifically,CDM introduces the key functions to formalize the key factors that influence the content diffusion process,and thus it can construct the model via a simple but efficient way.Further,we derive CDM by using different combinations of those key factors and put them into several typical ICN scenarios,to analyze the characteristics during the diffusion process such as diffusion speed,diffusion scope,average fetching hops,changing and final state,which can greatly help to analyze the network performance and application design.A series of experiments are conducted to evaluate the efficacy and accuracy of CDM.The results show that CDM can accurately illustrate and model the content diffusion process in ICN.     

Movie Scene Recognition Using Panoramic Frame and Representative Feature Patches简

Recognizing scene information in images or has attracted much attention in computer vision or videos, such as locating the objects and answering ＂Where am research field. Many existing scene recognition methods focus on static images, and cannot achieve satisfactory results on videos which contain more complex scenes features than images. In this paper, we propose a robust movie scene recognition approach based on panoramic frame and representative feature patch. More specifically, the movie is first efficiently segmented into video shots and scenes. Secondly, we introduce a novel key-frame extraction method using panoramic frame and also a local feature extraction process is applied to get the representative feature patches （RFPs） in each video shot. Thirdly, a Latent Dirichlet Allocation （LDA） based recognition model is trained to recognize the scene within each individual video scene clip. The correlations between video clips are considered to enhance the recognition performance. When our proposed approach is implemented to recognize the scene in realistic movies, the experimental results shows that it can achieve satisfactory performance.     

Simultaneous enhancement of breakdown strength and discharged energy efficiency of tri-layered polymer nanocomposite films by incorporating modified graphene oxide nanosheets

Developing high dielectric performance of polymer nanocomposites is still a long-standing issue to simultaneously inherit the high dielectric constant of nanofillers and maintain the high breakdown strength of polymer matrix. In the current study, a tri-layered nanocomposite film is fabricated by a simple and effective solution-casting and dip-coating method, where graphene oxide nanosheets (GONSs) were modified by insulating SiO₂ layer (SiO₂@GONSs) and polyvinylidene fluoride (PVDF)/SiO₂@GONS nanocomposite inner layer was sandwiched by polycarbonate (PC) layers. The surface modification could minimize the local electric field concentration and block conductive path. Furthermore, the sandwich or tri-layered structure inhibited the relaxation and migration of space charge or impurity ions and suppressed the charge injection, thus achieving enhanced breakdown strength and discharged energy efficiency. As a result, the as-prepared tri-layered nanocomposite film exhibited a dielectric constant of 5.2 and a low dielectric loss (tanδ) of 0.013 at 1 kHz, and breakdown strength of 219 MV m^?1, which was significantly higher than single-layered nanocomposite films and its counterpart without SiO₂ modification. The corresponding discharged energy density was 1.20 J cm^?3 with an excellent efficiency of 86.2% at 200 MV m^?1. More interestingly, the insulating SiO₂ modification layer and PC outer layers could also effectively restrict the relaxation or migration of impurity ions at a high temperature of 120 °C, endowing excellent high-temperature dielectric performance to the as-prepared tri-layered nanocomposite film. The combination of surface modification and sandwich structure opens up an avenue to fabricate GONS-based dielectric nanocomposites with low dielectric loss, high breakdown strength, high efficiency and high temperature tolerance.

Graphical abstract