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Lihua ZHANG Baozhi PAN Gangyi SHAN 《东北亚地学研究》2007,10(1):83-87
The authors generalized the methods how to identify and evaluate gas zones using logs,and put forward the methods of crossplots and overlays of porosity logs on the identification of volcanic gas-bearing reservoirs in the northern Songliao Basin with good results.This study provides technical clues in deep formations and offers references for other areas to identify oil and gas layers. 相似文献
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涡轮钻具由于其耐高温、高转速的特点,使其在高温和硬岩地层的钻进过程中发挥着重要的作用,并成为干热岩钻井和高温油气井钻井等领域的研究热点之一。本文从涡轮钻具的发展历程出发,对涡轮钻具的特点进行了系统地总结,从涡轮钻具的结构优化、涡轮叶片的设计与加工、轴承节的性能提升、减速涡轮钻具的研发、钻进新工艺的探索等5个方面对国内外涡轮钻具的研究进展进行了综述,发现总结了涡轮钻具研究过程中存在的一些问题,并结合我国在相关领域的实际需求,对未来我国涡轮钻具的重点研究方向提出了建议。 相似文献
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Parameter identification of hysteretic model of rubber-bearing based on sequential nonlinear least-square estimation 总被引:1,自引:1,他引:0
In order to evaluate the nonlinear performance and the possible damage to rubber-bearings (RBs) during their normal operation
or under strong earthquakes, a simplified Bouc-Wen model is used to describe the nonlinear hysteretic behavior of RBs in this
paper, which has the advantages of being smooth-varying and physically motivated. Further, based on the results from experimental
tests performed by using a particular type of RB (GZN110) under different excitation scenarios, including white noise and
several earthquakes, a new system identification method, referred to as the sequential nonlinear least-square estimation (SNLSE),
is introduced to identify the model parameters. It is shown that the proposed simplified Bouc-Wen model is capable of describing
the nonlinear hysteretic behavior of RBs, and that the SNLSE approach is very effective in identifying the model parameters
of RBs. 相似文献
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出口刚玉中铁的等离子体原子发射光谱测定 总被引:1,自引:0,他引:1
天然刚玉主成分为Al2O3,是自然界中仅次于金刚石的高硬度矿物,主要应用于研磨和耐火材料以及精密仪器的轴承等。国内外客户十分重视对进出口刚玉中Fe的检测。但刚玉硬度大,Al2O3含量高,试样的处理和分析测试均比较困难。本文采用高频电感熔样技术,以Li2B4O7为熔剂,可方便快速地 相似文献