温度、矿化度对高频电容法测持水率的影响

Effects of Temperature and Salinity on Water Hold-up Measurement by High Frequency Capacitance Method

本文详细分析高频电容法测持水率时温度、矿化度对测量的影响。油水混合物的电容和电阻同时取决于持水率，而电阻又取决于矿化水的电阻率。提高工作频率，一方面抑制了传导电流，从而抑制了温度、矿化度的影响，另外也降低了水的介电常数，使之接近了油的介电常数，因为水的介电常数是随温度变化的参数，所以提高工作频率是不能有效地抑制温度和矿化度对持水率的影响的。

Effects of temperature and salinity on water hold-up measurement by usinghigh frequency capacitance method in production logging is studied in this paper.Since the mean capacitance and resistance of oil-water mixture are all related to water hold-up and the mean resistance is also related to the conductivity of saltwater,when the operation frequency is within the range of several decade to several hundred MHz, the change of the temperature and salinity of the measurement environment must influence the measurement of water hold-up. It is not correct to verifythe water hold-up by measuring the fluid resistance and capacitance. The influenceof temperature and salinity can not be avoided effectively by rising operation frequency, because water dielectric constant will decrease to the level which is close tooil dielectric constant and water dielectric constant is a parameter varied with temperature.