Study Of Measuring Technique And Equipment On The Water Content Of The Crude Oil

Mine along with many years of the oil field, the high pressure affusion of the oil well makes water content in the crude oil pipeline higher, the water content directly affects the crude oil exploitation,dehydration, transportion, measure, sell, smelt etc.The inaccurate measure of the water content will affect directly oil well and oil layer dynamic analyse, destory the electrical field in the electric dehydrator, lower the dewatering effect, result in energy waste.During the process of the crude oil smelting,the superscale of the water content will easily cause serious accidents such as boil etc., so the on-line measure of the water content of the crude oil is very important.But the accurately measure of the water content is very difficult, therefore it is necessary to develop a water content meter with wide-scope, in order to realize the on-line measure of water content of crude oil.This has important meaning and practical value to position the layer of water and oil, estimate oil yield, predict the life of exploitation of the oil well and control the yield, detect the status of oil well, reduce energy waste ,low the cost and manage automatically.The measurment object of the research in this dissertation is the crude oil with water content.Because of the different water content,the output capacitances of the capacitor sensor vary.The range commonly between ten and hundred pF, so this dissertation mainly study the measurement of water content of crude oil.The main results are as follows:1. Through studying the domestic and international related documents, introduce the measuring technology of the water content , states quo and the trend of domestic and international related products.2.The existing several test methods of water content of crude oil are summarized and compared, the basic principle, application, merits and shortcomings are analyzed.The whole scheme has been advanced according to the feature of high viscosity and high water content of our country.3.The key part of the system namely the measurement of the output capacitance of the capacitor sensor has been expatiated and compared, according to the characteristics of every kind of methods, charge / discharge method has been adopted.4.The basic principle of the charge/discharge method is expatiated. Analysis, design, make and adjust the practical circuit of this method, namely capacitance is converted to linear proportional voltage value.5.Design,make and adjust the other parts of the system,including the conversion of voltage, namely voltage-frequency circuit, the equal-precision frequency measurement circuit, data collection and processing of PC.6.Analyze the experiment data, give some advices for the further perfect of the system.