Design And Implementation Of Measurement And Control Communication System For Water Injection Well

As the first energy factor for industry in the world,petroleum is called "the blood of industry".Petroleum resources are related to national energy security and play a vital role in social development.Our country is in a period of economic development,and the demand for oil is increasing.However,our country's oil reserves are limited.Many old oil fields have entered the middle and late stages of development.The development difficulty is increasing.It is necessary to improve the extraction technology to tap the remaining oil potential.Water injection is an important technical means to replenish oilfield energy,in order to solve the problems of large measurement and adjustment workload and rapid decline in water injection qualification rate in the later stage of oilfield development,an intelligent layered water injection technology has been developed.Based on the status quo of intelligent layered water injection technology,this paper designs a water injection well measurement and control communication system.The microcontroller is used as the main control unit of the downhole water distribution terminal,and the sensors are used to collect downhole water injection parameters.The surface host computer control center is used as the display and storage unit.The power line carrier method realizes the communication between the downhole terminal machine and the surface host computer control center,and realizes the real-time monitoring of the downhole water injection parameters and the water injection volume control.First of all,design the overall scheme of the system according to the functional requirements of the system,and make a reasonable selection of each functional module according to the performance requirements of the system,and determine the data acquisition scheme,the high-temperature power supply scheme and power line carrier communication scheme.Secondly,design the system hardware and software.Design data acquisition circuit,motor control circuit and power module circuit,simulate the power circuit through professional software,draw circuit schematic diagram and PCB diagram,and weld the circuit board manually.Design embedded program and host computer software,customize the communication data packet protocol between the host computer and the microcontroller,and debug each functional module separately.Finally,the overall function test and high temperature reliability test of the system are carried out.The prototype test platform of the water injection well measurement and control communication system was built.The system realized the functions of water injection parameter collection,motor control,host computer display and storage of water injection parameters,and communication between host computer and microcontroller.The communication distance of the system was 6km through the simulated cable test.The hightemperature storage,high-temperature operation,and overall high-temperature working reliability of the main control circuit of the microcontroller are tested.The results show that the microcontroller stores 210 minutes at 250?,the Flash data remains normal,and works at 100? for 180 minutes,the Flash data remains normal,and the main control circuit is in normal condition,working at 100? for 270 minutes,the function of each module is normal,indicating that the system has good high temperature reliability.