| 摘要: |
| 采用有限元法与实验测量相结合对可应用于声波测井的高灵敏度宽带接收器进行研究。通过ANSYS对接收器的优化分析表明,接收器的性能主要受陶瓷片长度和厚度的影响,减少陶瓷片长度有利于拓宽工作频带,增加陶瓷片厚度有利于提高接收灵敏度。优化后接收器的性能指标如下:接收器的工作频率为1～30 kHz,频带内接收灵敏度平均值为-204.85 dB,灵敏度起伏量小于2.3 dB。在此基础上,加工制作接收器并进行实验测试,测试结果与计算结果基本吻合,证实了接收器具有高灵敏度、宽频带的特点。 |
| 关键词: 声波测井 接收器 工作频率 接收灵敏度 |
| DOI：10.3969/j.issn.1673-5005.2014.06.008 |
| 分类号::P 631.63 |
| 基金项目:国家自然科学基金项目(11204380,1,11134011,2)；国家油气重大科技专项(2011ZX05020-009)；中国石油科技创新基金项目(2013D-5006-0304)；中国石油天然气集团公司项目(2011A-3903,1B-4001) |
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| Research on high-sensitivity and wide-band receiver used in acoustic well logging |
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WU Jinping1,2, QIAO Wenxiao1,2, CHE Xiaohua1,2
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(1.State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China;2.Key Laboratory of Earth Prospecting and Information Technology in China University of Petroleum, Beijing 102249, China)
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| Abstract: |
| Investigations on a high-sensitivity and wide-band receiver used in acoustic well logging are conducted combining finite element methods and experimental measurements. The optimization analysis on the receiver by ANSYS shows that the length and thickness of ceramic plates have major effects on the receiver performance characteristics. The operating frequency bandwidth broadens as the length of ceramic plates decreases, and the receiving sensitivity improves as the thickness of ceramic plates increases. Furthermore, the receiving performance of the optimized receiver is simulated by ANSYS, and its performance indices are obtained. In the operating frequency bandwidth from 1 kHz to 30 kHz, the average of receiving sensitivity is -204.85 dB and the sensitivity fluctuation is less than 2.3 dB. According to the optimized structural parameters of the receiver, a prototype is fabricated and measured in a water tank. The experimentally measurements are in good agreement with the calculated results, supporting the high sensitivity and wide bandwidth of the receiver. |
| Key words: acoustic logging receiver operating frequency receiving sensitivity |
