超短波含水率计高含水理论模型的建立

A Theoretical Model of the Ultrashort Wave Water-cut Meter

提出一种超短波（ＣＤＢ）含水率计的高含水理论模型。在测量条件下，当水为连续相时，ＣＤＢ传感器内流体中的传导电流超过位移电流而居于优势地位。在泡状流、高含水时，等势面应为绝缘层及覆在其上的油形成的绝缘区与矿化水的分界面。因此，传感器主要敏感于碰撞到内电极绝缘层上的油滴，而对于不接触内电极的油滴，传感器的响应要小得多。文中还分析了矿化度和温度对会水率测量的影响。

A new measurement model of the ultrashort wave water-cut meter used for production well logging is proposed. From the point of view, when the oil/water mixture in a well is water-continuous (i. e. in high water-cut case), the displacement current in the fluid is the minor term compared with the conduction current, though a very high working frequency is optimized. In bubble-flow case, the interface between saline water and the region which consists of insulating layer and the oil drops touching the layer, instead of the insulating layer-fluid interface, should be chosed as isopotential surface. The conclusion is that the seasor is much more sensitive to the oil drops touching the insulating layer of the probe than those which do not touch the layer. The effects of the fluid temperature and the water salinity are also discussed.