原油含水率测量温度-矿化度简化补偿模型研究

Study on Simplified Temperature-salinity Compensation Model of Water Content Measurement of Crude Oil

电容法在原油含水率在线测量领域有广泛应用,然而其测量精度容易受到温度与原油中水的矿化度影响。为量化温度与矿化度对原油含水率测量的影响,提高测量精度,设计了一套基于PCAP01芯片的原油含水率测量系统,通过多项式拟合获得了温度-电容与矿化度-电容的独立补偿模型,结合温度-矿化度-介电常数补偿函数,建立了带有电极保护套的电容法原油含水率测量温度-矿化度简化补偿模型,实现原油含水率测量在线补偿,使含水率测量系统在温度与矿化度同时影响下的测量误差从4.38%降低到0.1%以内,有效提高了原油含水率测量的准确度。

Capacitance method is widely applied in the field of on-line water content measurement of crude oil.However,its accuracy was easily affected by temperature and salinity of water in crude oil.In order to quantify the influence of temperature and salinity on water content measurement of crude oil and improve the measurement accuracy,a set of water content measurement system of crude oil based on chip PCAP01 was designed.Independent compensation models of temperature-capacitance and salinity-capacitance were obtained by polynomial fitting.A simplified temperature-salinity compensation model of water content measurement of crude oil with electrode protection sleeve based on capacitance method was established combined with the compensation function of temperature-salinity-dielectric constant of water,which realized online compensation of water content measurement,reducing the measurement error of the water content measurement system under the influence of both temperature and salinity from 4.38%to less than 0.1%and thus effectively improving the accuracy of water content measurement of crude oil.