Whole Process Electromagnetic Heating System Design for Extracting Crude Oil with Frequency Converter

According to the lifting difficulty problem in extracting the heavy oil and high-coagulate crude oil, a heating technology based on the frequency converter is proposed which can directly heat crude oil in the oil tube by taking the oil tube and bushing as heat supply. In this system, industrial-frequency three-phase alternating current can be converted to 100~1200 Hz single phase alternating current by AC-DC-AC inverse system and the frequency and duty ratio of the single phase alternating current can be adjusted in some scope independently. The single phase alternating current is applied to the oil tube, which is connected with the bushing by the oil bushing connecter on the bottom of the oil tube and electric power can be transformed to heat energy by skin effect. If the situation of the oil well changes, the system can track the resonance frequency utilizing automatic frequency track technology and the power factor of the system can reach 0.98 to guarantee the heating efficiency. The dynamic performance of the system is very well. It can effectively solve the non-balanced problem of the electric power transmission-line system and avoid wax coagulation on the tube wall.