Design And Development Of Electric Heating Interlocking Energy-saving Control Device For Heavy Oil Well

My country’s heavy oil resources are widely distributed and have large reserves,which are an important part of oil production.Heavy oil recovery is generally difficult and costly due to its high density and high viscosity.Heavy oil electric heating is a commonly used heavy oil recovery method in oil fields,which can effectively solve the above problems,so it is widely used.At present,the domestic oilfield heavy oil electric heating control system has shortcomings such as low degree of automation,low heating efficiency,and large power consumption,which restricts the reduction of heavy oil production costs and the digital construction of oilfields.Therefore,the development and application of a new type of electric heating energy-saving control device is of great significance for improving the economic benefits of the petroleum industry,enhancing its competitiveness,and saving energy and reducing consumption.Based on the above purpose,this paper designs and develops an electric heating interlocking energy-saving control device for heavy oil wells in combination with the needs of the heavy oil electric heating mining site in Liaohe Oilfield.This paper analyzes the characteristics and existing problems of heavy oil electric heating technology in field application,aiming at the problems of low heating efficiency,serious power consumption and low automation level of medium frequency electric heating in Liaohe Oilfield at present,and the configuration of field sensors and data acquisition conditions.A heavy oil electric heating control scheme based on electric power feedback is proposed.Based on the non-embedded acquisition of the oil well production electrical signal,the electric power of the heavy oil extraction motor is used as the closed-loop feedback signal to obtain the reference input of the optimal oil temperature,and through the differential feedback link of the wellhead oil temperature,while improving the temperature hysteresis effect,the energy-saving control of the output power of the intermediate frequency power supply is achieved.Relying on the existing pumping unit frequency conversion control cabinet and intermediate frequency power supply cabinet,it collects,analyzes,and processes the output electric power,wellhead oil temperature,derrick beam angular displacement,heating rod current and other signals of the pumping unit frequency conversion control cabinet,and select the micro-controller.The controller is used as the main control unit to control the output power of the intermediate frequency power supply.In order to ensure the safety and reliability of on-site applications,and to prevent on-site operation errors,controller damage,abnormal data and other emergencies,the heavy oil electric heating interlocking energy-saving control device is interlocked with the heavy oil electric heating system,and an independent switch is set to control the device.The input or disengagement of the automatic control mode and the existing manual power knob control mutually restrict each other,so as to ensure the safe production of oil wells.On this basis,select the main electronic devices and parameters of the main circuit and control circuit module,take STM32 as the core chip of the controller,design the data acquisition and processing module,control system and information transmission and other peripheral hardware circuits,and complete the circuit board production,welding and debugging work.The program of the energy-saving control strategy was developed based on the embedded controller,and a simulation test platform of the heavy oil production system was built in the laboratory.Finally,it was installed in the L-88 oil well of Liaohe Oilfield for field test,and the data analysis of the test results before and after the installation was carried out.The results show that the device has obvious energy saving and carbon reduction effects,which is of great significance for reducing the energy consumption of heavy oil production.