气水两相水平流动测井的流型实验研究

Experimental Study of Horizontal Gas-water Flow Pattern During Production Well Logging

为研究生产测井过程中气水两相水平流动介质分布变化特征及影响因素,建立与产出气井流动状况相似的模拟流动环路,以实际生产测井仪器串测量混合流体,同时观测实验流型并绘制出实验测井流型图。实验揭示气水两相分布的变化趋势与流体动力学的普通实验结果相似,说明测井条件下的气水两相流动依然满足一般规律,但流型变化边界产生的位移反映了气水两相流动在生产测井过程中的分布特征。研究结果对正确认识及把握气水两相水平流动测井条件下的两相介质分布及分析方法提供重要依据。

In order to study the characteristics of flow distribution changes and the factors affected by Production Logging Tool （PLT） on the gas-water two-phase flow during production well logging in horizontal wellbores, a flow-loop was built. An experimental test matrix designed to collect a maximum amount of data on the gas-water two-phase flow in horizontal wellbores was conducted on this transparent flow-loop of 16 m long, using air and tap water. Every measurement was strictly carried out in a steady-state gas-water mixed flow, by using production well logging tool-string. All flow patterns observed in these experiments were recorded by camera; all actual air and water flow rates were measured, respectively, by flowmeters located along the flow-loop. A well logging flow regime map that shows the gas- water flow patterns observed in these experiments was obtained according to these two parts of information. On the map, the variation trends of the gas-water two-phase distribution are similar to observations in ordinary fluid dynamics experiments, which means that the gas-water two-phase flow may well describe the general features in production well logging, but with its unique characteristic distribution interfered by measurements of the PLT and displayed on the flow regime map in the form of the boundaries shift. The results provide some insight for understanding the distribution of the gas-water two-phase flow during production well logging in horizontal wellbores.