阻抗传感器在近水平油水两相管流的实验研究

生产测井动态监测中水平井受井身结构、井简流动状态、重力影响等因素影响使得流动介质分布、速度分布、流体的流型、流速削面、油水的分布状态等与垂直井有很大的不同.设计了小管径多相流实验装置,实验介质是柴油和水,设置了分别为3～60 m3/d的10种流量,含水率变化范围10%～100%;分别为85°、88°、90°、92°、95°等近水平状态下的5个角度对阻抗传感器进行了实验.实验结果表明,流量大于10 m3/d时的流型是分相的泡状流,阻抗的相埘响应不受角度的影响,响应规律与垂直井类似;流量低于10 m3/d时的流型是层流,阻抗的相对响应同时受到流量、含水率、角度的影响,在同一角度下受流量和含水率的影响;受油水滑脱现象影响.低流量下的相对响应高于高流量的,持水率高于含水率;受角度的影响,在90°、92°、95°时输出的相对响应出现了向下的趋势,85°、88°时输出的相对响应出现了向上的趋势.实验传感器是仪器短节,排除了集流伞漏失对流体流型的影响,完全反映流体在传感器内流道的真实流动状态,高速摄像机记录了流体随流量和含水率的变化.

Experimental Study on Impedance Sensor in Oil-water Two-phase Flow of Near-horizontal Pipe

In performance monitoring of production log, since the horizontal wells are often affected by well structures, borehole fluid flow states and gravity, the flow media distributions, flowing velocities and fluid types, flowing velocity profiles and oil/water distributions in the horizontal wells are quite dif-ferent from those in the vertical wells. Designed is a small diameter multiphase flow test device. The test media are diesel fuel and water with 10 different flow rates and from 10% to 100% range of watercut changess; Experiments of impedance sensor were conducted in the device at five near-horizontal angles or inclinations (i. e., 85°,88°,90°,92°and 95°). The flow pattern is dispersed bubble flow when the flow rate is over 10 m3/d, the sensor's relative response is less impacted by the angles, and the response law is similar with that in vertical well The flow pattern is stratified flow when the flow rate is below 10 m3/d, the sensor's relative response is impacted by the flow rate, watercut and inclinations, and also by the flow rate and watercut at the same angle. Because of the oil/water slippage effect, the relative re-sponse is bigger at the lower flow rate than at the higher flow rate, and the water holdup is bigger than the watercut; Because of the inclinations influence, the output relative response goes down at 90°, 92°and 95°, but goes up at 85°and 88°. The sensor removes the influence of basket packer leakage on the fluid flowing patterns, and completely displays the true fluid flowing state in the sensor. The high speed video recorder records the fluids variations with the changes of flow rates and watercut.