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随钻测井数据采集系统主要用于采集地面各传感器的信号,并处理转换为工程值存储和显示.测量工程值通过RS485串行数据总线接口送司钻显示器显示.设计了基于ARM微处理器和VxWorks实时操作系统的嵌入式数据采集系统,实现了基于CPLD(Complex Programmable Logic Device)控制的数据采集电路.CPLD设计为有限状态自动机(FSM)控制采集的过程,通过硬件实现了连续的实时数据采集和实时数据处理. 相似文献
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给出了PC机并行打印口工作模式SPP和EPP下,数据采集系统的接口电路的硬件设计与EPP软件设计方法.该系统采用PC机的并行打印口实现与计算机之间的通讯,并将采集到计算机的数据进行处理、存储和显示;在无须开箱的情况下即可完成大量、连续的数据采集工作. 相似文献
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EILog-05双侧向数据采集板的改进设计 总被引:1,自引:1,他引:0
EILog-05测井系统中的高分辨率双侧向测井仪在组合试验中发现其通讯可靠性较差,有时还出现曲线跳尖现象.对双侧向测井仪的通讯控制部分进行了改进设计,利用CPLD芯片EPM7256AE实现DTB通讯协议,开发了基于DSP的数据采集板.介绍厂DTB通讯接口、CPLD逻辑、数据采集电路的实现方法以及软件控制流程的编写,并给出接收命令和上传数据的时序仿真.改进数据采集板的功率控制增加了低电阻率时的分段区间,改善了低电阻率时的信噪比.现场试验及油田应用表明,EILog-05双侧向数据采集板的改进设计有效提高了其在大组合系统中通讯控制的可靠性,并能有效消除测井曲线跳尖现象. 相似文献
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介绍了CAN总线特点及其在石油测井仪器中的应用.为适应快速组合测井平台数据传输的要求,利用DSP芯片TMS320LF2407A的CAN控制器模块,开发了基于CAN总线的测井数据采集系统.该系统是联系井下仪器与遥传的中间环节,负责接收地面下发的控制命令,上传采集和处理的数据.在硬件上采用统一的电路以解决重复设计的问题,具有一定的通用性;在软件上采用模块化方法,体现出设计的灵活性.描述了DSP控制器、CAN通讯、CPLD逻辑、数据采集电路的实现方法,以及主控制流程、CAN数据收发流程的编写.整个系统具有较高的可靠性和扩展性,在实际应用中也取得了很好效果. 相似文献
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利用直接数字频率合成技术设计信号源 总被引:1,自引:0,他引:1
采用模拟电路设计的信号源存在频率精度不高、调试与维修不方便、工作不够稳定以及直接升级困难等缺点.文章提出了利用直接数字频率合成技术(Direction Digital Frequency synthesis Technology简称DDS)设计信号源,分别介绍了基于CPLD、单片机、DDS芯片和简单数字电路等4种信号源设计方法.4种方法都包含了信号数据表、读取数据表的电路、D/A电路和低通滤波器电路.更改数据表的数据就可以改变信号类型,用不同速率读取数据表中的数据就可以得到不同的信号频率.这2种值的改变都可以通过软件实现,实现了信号源设计的软件化.改进设计后的信号源不仅有很高的频率精度,而且电路结构简单、电路工作稳定、维修方便. 相似文献
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《Egyptian Journal of Petroleum》2022,31(2):7-14
The engine oil contains various performance additives along with polymer-based viscosity index improver, which are made from special types of flexible long chain polymers whose functionality is derived from their thickening efficiency, viscosity-temperature relationship, and shear stability. Olefin copolymers of the type ethylene/propylene copolymer are extensively used as viscosity index improver for engine oil formulations whose performance is a function of their composition, co-monomer sequence distribution and molar mass. Polymer coils interact with base oil and make it increasingly resistant to flow which accounts for substantial changes in viscosity parameters i.e. kinematic viscosities and viscosity index of blended base oils. Intrinsic viscosity of a polymeric solution is an important “dilute solution viscosity” parameter, which is easily measurable using Ubbelohde viscometer.In the present work, intrinsic viscosity of twenty samples of laboratory synthesized olefin copolymer in cyclohexane at 30 °C were correlated with their thickening efficiencies, kinematic viscosities of the olefin copolymer blended base oils at 40 °C and 100 °C. These correlation studies enable prediction of performance of olefin copolymer in blended base oil based on an easily and quickly measurable intrinsic viscosity parameter, leading to faster screening of large number of olefin copolymers for their utility as viscosity index improver in lubricants, in a short span of time with limited resources. 相似文献
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以异佛尔酮二胺(IPDA)与碳酸二甲酯(DMC)为原料,乙醇钠为催化剂,通过氨解法合成出目的产物,利用GC-MS和IR对目的产物进行了分析表征,并考察了合成条件包括原料配比、反应温度、反应时间、催化剂用量等对目的产物收率的影响。结果表明,产物分子的离子峰为286.3,结构与异佛尔酮二氨基甲酸酯(IPDC)一致;在催化剂用量(占原料的质量分数)为5%,n(DMC)∶n(IPDA)为6,反应温度为65~70℃,反应时间为7 h的优化条件下,产物IPDC的收率为83%。 相似文献
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《Egyptian Journal of Petroleum》2022,31(2):51-58
The phenomenon of oil swelling at the oil-carbonated water (CW) system could be an important mechanism during the water alternating gas (WAG) injection process. Nevertheless, the study of the main mechanisms during water flooding (WF) is a complex topic that has not been well revealed so far, especially for asphaltenic crude oil (ACO) systems. Hence, the main goal of this experimental work is to determine the influence of carbon dioxide (CO2) within the water phase in the interfacial tension (IFT) between water and crude oil for an extensive range of pressures between 400 psi and 2000 psi (i.e. 2.76–13.79 MPa), under two temperatures of 313.15 and 323.15 K (i.e. 40 and 50 °C) by axisymmetric drop shape analysis (ADSA) method. The experimental results demonstrate that the water/ CW and crude oil IFTs decline with time. The value of dynamic IFT (DIFT) between CW and crude oil decreased about 6 mN/m in comparison with the oil–water DIFT. As a result of the CO2 solubility, the crude oil droplet swells with increasing pressure. When the temperature rises, the effects of increasing entropy phenomena and decline of liquids density is dominant compared to the solubility of CO2. Thus, the volume of oil droplet increases with temperature, unexpectedly. In addition, as thetemperature increases the water/CW-Oil IFT is slightly reduced over a wide range of pressure evaluated. Nevertheless, there is a slight increase as the pressure increases for the water–oil system. According to the predicted results, interfacial tension of the CW-oil system declines with increasing pressure until the solubility of CO2 is reached to a maximum value and then approximately remains changeless. 相似文献
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主分量分析和独立分量分析方法的比较研究 总被引:2,自引:1,他引:1
统计特征方法在信号处理、模式识别等领域的应用越来越广泛,特别是独立分量分析(ICA)在理论研究和实际应用中备受关注。主分量分析(PCA)和独立分量分析总的方法和思路比较相似。在分析PCA和ICA的原理及特点的基础上,分别用PCA和ICA对模型和实际地震数据进行了验证,并比较和分析了两者在信号处理中的特征提取能力。结果表明:在实现信号分离时,PCA分解后的各个分量仍然保持一定的相关性,而ICA分解后的各个分量保持独立。 相似文献
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阐述了现代企业制度的基本内涵,并从四个方面探讨了现代企业制度下完善内部审计监督的必要性:第一,健全内部审计监督是建立现代企业制度的客观要求;第二,内部审计自身的优势为现代企业制度下完善内部审计监督奠定了基础;第三,我国企业内部审计与国家审计、社会审计的不同特点,决定了现代企业制度下的内部审计工作必须进一步健全;第四,审计法律、法规为现代企业制度下完善内部审计监督提供了可靠保证。 相似文献
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Hamzeh F. Haghshenas Robert Rea Davoud F. Haghshenas 《Petroleum Science and Technology》2013,31(22):2275-2282
AbstractAging can significantly reduce the durability of binders used in asphalt pavements and can consequently impose long-term maintenance cost to the owners. Antioxidants are additives that can be used to hinder oxidation and hardening of petroleum asphalt binders. In this study, the effect of zinc diethyldithiocarbamate (ZnDEC) as an antioxidant on chemical and rheological features of the binder were evaluated and monitored during laboratory aging process. The results indicated that not only ZnDEC can retard the aging process, but it also improves the low- and mid-temperatures cracking resistance without negatively affecting the rutting performance of the binder. 相似文献
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原油开采项目的技术经济特点不同于一般工业性项目,其产品(原油)产量逐年递减,而其收入也相对逐年减少,造成了项目的投资利润率和投资利税率等指标逐年降低.本文从原油开采项目的一般生产规律和技术经济特点出发,对其经济规律进行了初步的研究,以期对油田的经济预测和决策工作能够起到一定的指导作用。 相似文献