Research On Steam Quality Analysis Technology Of Steam Injection Boiler Based On Microfluidic Control

Petroleum is an important energy and chemical raw material.The world’s proven reserves of heavy oil are approximately 815 billion tons,accounting for 70% of the remaining global oil reserves.Steam injection boiler is currently an important equipment for heavy oil exploitation.The steam quality of the steam injection boiler determines the efficiency and quality of heavy oil extraction.The higher the steam quality,the more heat carried per unit of steam,and the higher the recovery rate of heavy oil.If the steam is too dry,the temperature of the furnace tube will rise sharply,and the salt composition in the steam will condense on the tube wall to form scale,resulting in deterioration of heat transfer and formation of blockage,affecting the safe operation of the boiler,and even May cause a pipe burst accident.Therefore,the research on the steam quality detection technology of steam injection boilers is of great significance.At present,the domestic and foreign detection methods for steam quality of steam injection boilers mainly include radioactive method,sound control method,differential pressure method,chemical test method and conductivity method.However,these methods all have problems such as high detection cost,complicated detection process,large consumption of sample reagents,and inability to realize realtime online detection.In response to the above problems,this paper proposes a steam injection boiler steam quality detection technology based on microfluidic chips.The main research content and conclusions of the thesis are as follows:(1)Research the principle of steam quality detection for steam injection boilers.Based on the working principle of the steam injection boiler,the steam dryness is determined by calculating the ratio of the chloride ion concentration of the feed water of the steam injection boiler to the boiler water.The detection method of chloride ion concentration was researched,the chloride ion concentration detection technology based on the Mohr method was proposed,and the superiority of the Mohr method in detecting the chloride ion concentration was verified through experiments.(2)Based on the detection of chloride ion concentration based on the Mohr method,a detection technology based on the sudden change in absorbance to determine the endpoint of the Mohr titration was proposed to solve the instability and error caused by the naked eye judgment of the titration endpoint in the traditional titration process.The detection system based on the sudden change in absorbance to determine the titration end point,and by comparing the detection results of the traditional naked eye identification titration end point,verifies the advanced nature of the detection method proposed in this article.(3)Microfluidic chip technology has significant advantages of micro-volume and high efficiency.Therefore,this article uses microfluidic technology to integrate the steam dryness detection system.It is proposed to solve the problem of high consumption of samples and detection reagents in the steam dryness detection process.The integration of the detection process on the microfluidic chip can also solve the complicated operation process and long operation period of the traditional manual assay method.(4)In order to realize the on-line detection of steam dryness,design,process and assemble the prototype of steam injection boiler steam dryness detection principle based on microfluidic control.This paper proposes a steam injection boiler steam quality detection technology based on a microfluidic chip,and through theoretical analysis and experimental research,the practical value of this technology is verified.This method is of great significance to the accurate,fast and real-time measurement of steam quality of steam injection boilers.