Development and application of distributed optical fiber acoustic vibration sensor system
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摘要: 针对油气田勘探开发需获取微声波信号完整波形的问题，开展了基于双脉冲外差调制与反正切外差解调方案的分布式光纤声波传感（DAS）技术研究与配套系统研发。通过特征参数室内振动模拟实验，新型DAS系统的响应频率范围20 Hz～25 kHz、最大动态范围60 dB、信噪比49 dB，满足微声波信号幅度、频率、相位等信息的探测需求。同时，该系统在新疆油田稠油热采井下蒸汽腔探测方面成功开展了现场应用，实测有效声压强度−195 dB，验证了系统的可靠性，具有良好的应用前景。Abstract: In view of the problem that the exploration and development of oil and gas fields need to obtain the complete waveform of micro acoustic disturbance signal, the research and development of distributed optical fiber acoustic sensor (DAS) technology and supporting system based on the scheme of double pulse heterodyne modulation and arctangent heterodyne demodulation were carried out. Combined with the indoor vibration simulation experiment of characteristic parameters, the response frequency range of the new DAS system is 20 Hz~25 kHz, the maximum dynamic range is 60 dB, and the signal-to-noise ratio is 49 dB, which can meet the detection requirements of micro acoustic wave of the amplitude, frequency and phase of the complete waveform. Meanwhile, the system has been successfully applied in the detection of underground steam cavity in heavy oil development of Xinjiang Oilfield. The actual effective sound pressure intensity is −195 dB, which verifies the reliability of the system and has a good application prospect.
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Keywords:
- distributed optical fiber /
- acoustic sensor /
- double pulse /
- heterodyne demodulation /
- steam chamber
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图 4 振动信号时域重构与功率谱密度
Figure 4. Time-domain reconstruction and power spectrum density of vibration signal
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图 6 解调信号幅度随电压的变化曲线
Figure 6. Change curve of demodulation signal amplitude with voltage
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图 7 解调信号幅度随频率的变化曲线
Figure 7. Change curve of demodulation signal amplitude with frequency
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图 8 3个PZT上同时施加不同振动信号的解调结果
Figure 8. Demodulation results of different vibration signals applied simultaneously on three PZT
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图 9 SAGD水平井循环预热DAS测试示意图
Figure 9. Schematic of circulating preheating and DAS test of SAGD horizontal well
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图 11 430 m处信号的时域与频域波形（10 h）
Figure 11. Time-domain and frequency-domain waveforms of signal at 430 m (10 h)
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