光学法测量井下多相流中气相流量的方法研究

在传统的三相流测井中,流量测量是油气水三相的总体响应,无法直接获得分相流量,给测井资料的解释带来很大困难。采用光学多普勒-反射波法,利用光学多普勒效应测量流体中气相的流速,利用反射光波强度测量持气率;通过非集流的方式,在基本不改变流体流动状态的情况下,实现井下多相流中气相流量测量。测量数据反映了被测流动截面上不同介质的光学特性,由计算机根据特定算法将其转化为图像像素,进而重建和显示气相截面图像。该测量方法可实现同一界面上多点测量和多界面测量,可以获得多相流体流动截面的相态分布和速度分布的清晰图像,实现真正的流动成像测量。

Research on the optical measurement of the gas phase flow rate in borehole multiphase flow

In traditional triphase flow well logging, flow measurement is the total response of the three phases including oil, gas and water, which makes it impossible to obtain the separate phase flow rate directly and thus gives rise to much difficulty in explaining logging data. Adopting the optical Doppler reflection survey and utilizing the optical Doppler effect to measure the flow velocity of gas phase in fluid, the measurement of the gas phase flow rate in borehole multiphase flow is achieved in a non-mass flow way with the flow state of fluid remaining basically unchanged. The measurement data obtained reflect the optical characteristics of the different media on the measured flowing section, which are converted to the picture element by the computer according to the special algorithm and then the gas phase cross-section image is reconstructed and shown. Using this logging method can achieve multi-point measurement and multi-interface measurement on the same interface, obtain the sharp image of the phase distribution and velocity distribution on the flowing section of multiphase fluid, and achieve real flowing imaging measurement.