Experimental Study on Water Cut Measurement of Low Flow Fluid Using Coaxial-Array-Capacitor

In view of a widely existed difficulty in measuring water cut of production wells of greater than 90% water content and less than 10 m3/d output in the later water projection production in China oilfields,based on the principle of measuring water cut using coaxial capacitor,we design a coaxial-array-capacitor for water cut measurement and complete a dynamic experiment,and establish a model for water cut measurement according to experiment result.The above result shows that in the range of 0~100% water cut,the water cut behavior of the coaxial-array capacitor has logistical relationship,and has a higher water cut resolution especially when the water cut is greater than 90%,and has a better repeatability,however,the water cut behavior is regularly affected by the fluid flow.It also shows that the affection of flow can be corrected by the model established for water cut measurement,and the RMS error derived from the water cut model is less than 3% when the water cut is greater than 30%.This shows that the water cut sensor developed is suitable for measuring the water cut in low production fluid and middle-high water cut production wells,especially in production wells greater than 80% water cut.