Research On Interface Measurement Method Of Oil And Water Based On Propagation Characteristics

During the subsidence process of crude oil extraction, determining the boundary surface location accurately contributes to improve the efficiency of oil-water separation. In the process of oil-water separation, oil-water interface and transition zone is measured and detected. In this paper, based on the domestic and international relevant references, current research situation and the methods for detecting the oil-water interface are analyzed. Based on microwave transmission characteristics, a method of detecting oil-water interface is proposed. The difference of electromagnetic wave propagated in crude oil and water is used to realize the detection of oil-water interface.The main work and results in this paper are as follows:1. The methods and principles for detecting the interface of oil and water are introduced. Based on microwave transmission characteristics, a method of detecting oil-water interface is proposed, the measuring principle is analyzed.2. The simulation models of oil-water boundary surface measurement are established and analyzed by Ansoft HFSS software. The transmission model of the electromagnetic wave in different medium is simulated, the relation between insertion loss and frequency in different medium is got; for practical measurement model, the variation of insertion loss with height is got; the application of the narrowband antenna and the broadband antenna are compared and analyzed respectively. The results show that: Three kinds of medium air, oil and water can be distinguished according to the transmission characteristics, the oil-water interface and oil-air interface also can be measured.3. By the simulation results, the test system is built and the experiments are carried on. The transmission characteristics of the electromagnetic wave in crude oil, water and air are measured, the relation between insertion loss and frequency in different medium is got. By the measurement of oil-water interface of the practical model, the variation of insertion loss with height is got, the measurement results are analyzed. The results show that: the oil-water interface and oil-air interface can be measured in different frequency ranges.