用屏蔽暂堵技术封堵水平井裂缝性漏层

克拉玛依油田HW702水平井的大斜度段和水平段,将穿越纵向裂缝发育的二叠系佳木河组储层。为安全钻进和保护油层,用超细碳酸钙和磺化沥青复配后加入复合离子钻井液中成屏蔽暂堵的堵漏钻井液。室内用岩心试验,屏蔽暂堵后渗透率可降为0,暂堵深度小于3cm,可用酸化和射孔解堵。现场使用效果也很好,使HW702水平井顺利完钻,并获得工业油气流。     

FAST MEASUREMENT OF ASH CONTENT IN COAL WASHING PLANT

The coal filter cake is a product of fine coal after floatation which has an ash content of 7-13%, water content of 30±2%, and a particle size of less than 1 mm. The ash content was measured by the intensity of the single backscattered gamma-ray, and its accuracy is mainly dependent on the energy of the gamma-ray. The 238Pu low energy photon source is selected in this work. The energy of its gamma-ray is 15 keV, which can result not only in the best sensitivity, but also in the lowest contribution to the environment radiation. The root mean square deviation of the ash measurement is±0.33% (±1σ).     

基于FPGA的高速脉冲恒流控制系统的设计

结温是表征发光二极管品质和寿命的一个关键因素,针对电致发光光谱检测法测量LED芯片结温需要脉冲电流精确可控的突出问题,以Xilinx XC3S400 FPGA为核心,设计并开发了一套高速度、高精度的脉冲恒流控制系统。该系统根据从PC接收的数据精确控制LED上脉冲电流大小、脉冲周期、脉冲宽度,同时在保证脉冲电流的升降时间小于5μ~s的情况下将过冲控制在5%内,以避免因冲击电流过大而损坏LED,为非接触式测量LED灯具中芯片结温提供了极大的方便。该系统稳定可靠,效果良好。     

Influence of Different Surface Modifications on the Photovoltaic Performance and Dark Current of Dye-Sensitized Solar Cells

The TiO2 nanoporous film photoelectrode, as a crucial component of dye-sensitized solar cells, has been investigated. The photovoltaic properties and the dark current were studied by two surface modification methods. One was to apply a compact layer between the conductive glass substrate and nanoporous TiO2 film. Another was to produce TiO2 nanoparticles among the microstructure by TICl4 treatment. A suitable concentration and number of times for TICl4 treatment were found in our experiment. The dark current is suppressed by surface modifications, leading to a significant improvement in the solar cells performance. An excessive concentration of TICl4 will produce more surface states and introduce a larger dark current reversely. The dye is also regarded as a source of charge recombination in dark to some extent, due to an amount of surface protonations introduced by the interracial link in the conductive glass substrate/dye interface and dye/TiO2 interface.     

基于多微处理器主从式核物位监测系统的研制

本文介绍了一种基于多微处理器的主从式核物位监测系统的设计。简述了测量原理。从外部结构、硬件电路、通讯协议和软件编制几个方面详细介绍了系统设计。该系统目前在多个发电厂除尘系统得到应用,取得很好的效果。     

单晶Si太阳能电池工艺仿真与性能分析

日益成熟的集成电路工艺与器件计算机辅助设计工具有助于缩短半导体工艺和器件的开发周期、降低开发成本,因而越来越被广泛应用。基于TCAD工具,给出了一种简单pn结太阳能电池的工艺过程,详细介绍了其短路电流、开路电压、填充因子以及转换效率等性能参数的仿真方法,并以p型衬底上单晶Si太阳能电池为例,分别讨论了其伏安特性、光谱特性、照度特性和温度特性。与实验方法相比较,基于TCAD的辅助设计方法对加快国内太阳能电池工艺的技术发展将起到积极的作用。     

超细纤维PU革缝合撕裂强度影响因素的研究

采用正交试验法研究了超细纤维PU革 ,在不同缝合工艺条件下制成试样的撕裂强度 ,结果表明 :对缝合效果要求不同时 ,影响皮革缝合撕裂强度各因素的显著性排列的顺序也不同。     

一种集成稳压电路的设计与研究

设计了一种采用CSMC 0.6um CMOS工艺的集成带隙基准电压源电路.仿真结果表明,在电源电压VDD为5V时,在的温度范围内,电路得到一个温度系数为37.3533ppm/℃,电源抑制比(PSRR)为43.98dB的带隙基准电压输出,性能较为理想.     

新型抗高压堵漏剂的研究与评价

介绍了一种新型抗高压堵漏剂OCL-GYDL，该堵漏剂由多种不同的聚合物和起架桥支撑、膨胀变形的多种颗粒组成，采用化学堵漏与颗粒桥接堵漏相结合的方法研制而成，其特点在于其延时膨胀性和多种尺寸颗粒的存在，具有一定的黏弹性及较高的抗压强度，形成凝胶的时间可调，并可根据漏层的情况，调配颗粒大小，适用于大漏、返出量太少的裂缝性、溶洞性、破碎性地层，以及漏失位置不好确定的漏层。该剂在四川分水1井的应用中取得了良好的堵漏效果，平均一次性堵漏成功率达75％。     

金红石型纳米TiO_2的液相激光烧蚀合成

利用浸入聚乙烯基吡咯烷酮(PVP)水溶液中的金属钛片为靶材,采用1064nm红外脉冲激光进行液相激光烧蚀制备了金红石型纳米TiO2。应用XRD、TEM、HRTEM和Raman对产物进行表征,并对其形成机理进行了探讨。结果表明:金红石型纳米TiO2可通过液相激光烧蚀法在室温下一步合成,颗粒平均粒径约50nm,尺寸分布比较窄,分散性较好。脉冲激光诱导的瞬间等离子体可能是金红石型纳米TiO2形成的主要原因。