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    • 4. 发明申请
    • METHODS AND APPARATUS HAVING BOREHOLE SEISMIC WAVEFORM COMPRESSION
    • 具有井筒地震波形压缩的方法和装置
    • WO2013052423A3
    • 2014-05-08
    • PCT/US2012058330
    • 2012-10-01
    • HALLIBURTON ENERGY SERV INCSTOLPMAN VICTOR
    • STOLPMAN VICTOR
    • G01V1/22
    • E21B47/16E21B47/12G01V1/48G01V11/002G01V2200/16H03M7/3059
    • An illustrative seismic while drilling system includes a drill string having at least one seismic sensor that can be employed to detect seismic signals during pauses in the drilling process, e.g., when extending the length of the drill string. An embedded processor digitizes a signal from the seismic sensor to obtain a digital waveform and processes the digital waveform to derive a compressed waveform representation for storage or transmission. Compression is provided by adaptively reducing the sampling rate and quantization resolution subject to one or more quality constraints including, e.g., error in first break timing, error in first break sign, mean square error, and bit count. Reasonably good representations of the received acoustic waveforms can be achieve with less than 200 bits.
    • 示例性的地震同步钻井系统包括具有至少一个地震传感器的钻柱,所述地震传感器可用于在钻井过程中的暂停期间检测地震信号,例如当延伸钻柱的长度时。 嵌入式处理器将来自地震传感器的信号数字化,以获得数字波形,并处理数字波形以导出用于存储或传输的压缩波形表示。 通过自适应地降低采样速率和量化分辨率来提供压缩,这受到一个或多个质量约束的限制,包括例如第一中断时序的误差,第一中断符号的误差,均方误差和位计数。 接收的声波形的合理表示可以用少于200位来实现。