Study On Network Test System Of Oil-Water Content

The oil-water content is a key parameter in petroleum industry. The inaccurate measure of the oil-water content directly affects the quality of oil, destroy the electrical field in the electric dehydrator, lowers the dewatering effect, results in energy waste. However, it is difficult to measure the oil-water content owing to the inherent complexity of the two-phase flow. So the on-line and accurate measurement of the oil-water content is an imminent demand for petroleum industry.The measurement object of the research in this paper is the crude oil with water content. Through studying the domestic and international related documents, the existing several test methods of water content of crude oil are summarized and compared. The basic principle, application, merits and shortcomings are analyzed. According to the feature of high viscosity and high water content of our country's crude oil, the method of applying wave guide is selected to measure the water content of pipeline in this paper. According the principles of wave guide to measure the oil-water content, Launch coil provides a certain frequency of electromagnetic waves in the oil pipeline. It can be measured by the phasic attenuation of two receivers, then it can calculate the oil-water content by the difference of phasic attenuation of electromagnetic wave and the dielectric constant of oil-water mixture.At measurement system, The circuits of producing and magnifying 80MHz signal and testing the phase difference are designed, then electromagnetic signal is provided to the launch coil, the phasic attenuation of two receivers can be measured by detection circuit of phasic attenuation. A/D in MSP430F149 single-chip can be applied to the phasic attenuation and temperature, after the data sample and processing, the oil-water content will be achieve.In network system, Launcher sends out the measured data which is encoded, The receiving circuit will receive the data and decode, through AT89S51 and display circuit shows the measured oil-water content, The received data can be transmitted to PC by serial data interface to carry out network. By a system of hardware and software debugging and experimental work,it is proved that wave guide to measure the oil-water content is feasibility. It can overcome the effect of electrical conductivity, measure from 0 to 100%, reflect integration, low power, portable, achieve measured data network and be suitable for the measurement of oil-water content in field.