| 钻进过程中基于小波包理论的岩性识别研究 |
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| 引用本文： | 王潜龙,王冶,冯全科,屈展.钻进过程中基于小波包理论的岩性识别研究[J].石油学报,2004,25(3):91-94. |
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| 作者姓名： | 王潜龙 王冶 冯全科 屈展 |
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| 作者单位： | 1. 西安交通大学能源与动力工程学院, 陕西西安, 710049;2. 中国原子能科学研究院, 北京, 102413;3. 西安石油大学, 陕西西安, 710065 |
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| 基金项目： | 国家自然科学基金资助项目“远程钻井网上会战智能应用系统理论与方法的研究”(No .50 0 740 2 4 )。 |
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| 摘 要： | 提出了一种利用钻柱轴向振动调幅信号实现岩性识别的方法.三牙轮钻头钻进不同岩石时易引发携带强烈背景躁声的钻柱轴向调幅振动信号,采用小波包多层分解、域值滤波、最优向量选取及重构信号等方法并结合快速傅立叶变换频谱分析,有效地提取出被噪声淹没的调幅信号,检测出中心频率及其边频率带,计算出与岩性相关的综合齿数,从而快速、有效地实现了岩性分类.
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| 关 键 词： | 钻井 三牙轮钻头 轴向振动 调幅信号 小波包理论 岩性识别 |
| 文章编号： | 0253-2697(2004)03-0091-04 |
| 收稿时间： | 2003-6-16 |
| 修稿时间： | 2003年6月16日 |
Lithology identification based on wavelet pocket theory during drilling |
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| WANG Qian-long,WANG Ye,FENG Quan-ke,QU Zhan.Lithology identification based on wavelet pocket theory during drilling[J].Acta Petrolei Sinica,2004,25(3):91-94. |
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| Authors: | WANG Qian-long WANG Ye FENG Quan-ke QU Zhan |
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| Affiliation: | 1. School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;2. China Institute of Atomic Energy, Beijing 102413, China;3. Xi'an Shiyou University, Xi'an 710065, China |
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| Abstract: | A new lithology identification method based on axial amplitude modulation signal of drill string is proposed.The background noise on drilling string is easy to be induced.The axial amplitude modulation signal can be produced while drilling in rock formation with different lithology by using three-cutter bit.The wavelet packet multilevel-decomposition method was applied to threshold filter.The best wavelet coefficient vector is analyzed by fast Fourier transform,and the modulated feature is extracted from the corrupted signal.The central frequency and sideband frequency are detected on spectrum figure.The number of complex tooth on bit corresponding to different lithology of rock has been obtained.The effective and fast lithology discrimination has been realized. |
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| Keywords: | drilling three-cutter bit axial vibration amplitude modulation signal wavelet packet theory lithology identification |
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