Abstract: The acoustic emission(AE) technique was used to measure the AE signals of gas⁃liquid slug flow in horizontal pipes with non⁃intrusive and real⁃time monitoring features. Parameters of AE signals were calculated by setting window time and Critical Time of Elongated Bubble(CTEB). The characteristics of AE signal of slug unit were analyzed simultaneously. Based on the time delay of the same liquid slug arriving at two AE sensors, the AE method was used for detecting the translational velocity of liquid slug. Also, the measurement result of AE method was compared with the parallel conductivity method and Nicklin correlation. It is found that the AE signal of slug flow is very clear. The signals of liquid slug head, liquid slug body and elongated bubble decrease gradually and the signals of elongated bubble are below the threshold. The absolute energy and count of liquid slug increase with the superficial liquid and gas velocity respectively. AE technique could be used to monitor the frequency and translational velocity of liquid slug and it is a valuable method for application in the oil and gas field.

Key words: Transportation, Petroleum, Acoustic emission, Two?phase flow, Measure

摘要： 采用声发射技术对水平管内气液两相段塞流声信号进行非侵入式、实时检测。通过设定时间窗和长气泡定义时间计算声发射信号参数，分析段塞单元声信号特点，利用双通道声发射传感器,根据同一液塞到达前后两个传感器的时间差来计算段塞速度，测试结果与双平行电导探针、Nicklin经验公式对比。结果表明,段塞单元信号特征明显，液塞头部、液塞体和长气泡声信号依次减弱，长气泡区信号低于阈值。声发射技术可以检测液塞速度，具有油田现场工程应用价值。

关键词: 运输, 石油, 声发射, 两相流, 　测量