基于低频弹性波特征响应的油气钻井气侵井下监测模拟实验系统1)

EXPERIMENTAL SYSTEM FOR GAS-KICK DOWNHOLE DETECTION BASED ON THE CHARACTERISTIC RESPONSE OF LOW-FREQUNCY ELASTIC WAVE IN OIL AND GAS DRILLING1)

  • 摘要: 气侵井下监测是保障气侵早发现、早预警的先进理念和技术趋势。该实验系统包括模拟井筒、气液控制系统、低频弹性波信号收发系统三部分,以及配套的实验数据处理方法。该实验系统可直观地呈现气侵后气泡的运移和分布规律,观测气侵前后低频弹性波在速度、衰减方面的变化特征,由此监测气侵是否发生。该实验系统测量结果与Commander & Prosperetti理论模型预测结果吻合良好,可用于研究分析频率、含气率、工作液性质(密度、黏度)对含气泡液体低频弹性波特性的影响,为基于低频弹性波特性的气侵井下监测构建了基础实验平台。

     

    Abstract: Downhole detection of gas kick is an advanced concept and technology trend to ensure its early detection and early warning. This experimental system proposed in this paper includes three parts: simulated wellbore, gas-liquid control system, and low-frequency acoustic signal trigger/receiving system. And the relevant data processing method is developed. This experimental system can directly show the bubble migration and distribution characteristics after gas kick, and it can observe the change of phase velocity and attenuation of low-frequency acoustic waves due to gas kick, which is helpful for its detection. The measurement results of the experimental system are in good agreement with the predictions of theoretical models. Therefore, this experimental system can be used to investigate the low-frequency acoustic properties of bubbly liquids at different frequencies, gas fraction, and working fluid properties (such as density and viscosity). This new experimental system provides a basic platform for the research of gas kick downhole detection based on the characteristics of low-frequency acoustic waves.

     

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