Design And Experimental Study Of Subdivision Waterflooding Integrated Intelligent Device

As the major oil fields in China enter the period of extremely high water cut,the reservoir production capacity drops sharply due to the serious formation heterogeneity contradiction and the high dispersion of the remaining oil.Therefore,it is an inevitable choice to carry out fine adjustment of injection and production structure between Wells,between layers,within layers and on planes,and to develop multi-level fine and layered water injection technology to improve injection and production rate.At present,there are many problems in conventional water injection process,such as too much work and too long time due to too dense deployment period,which waste a lot of manpower and material resources and cannot meet the needs of fine development of oilfield.Based on the above engineering background,it is very necessary to develop an intelligent layered water injection device with high degree of automation and stable performance.In this paper,the subdivision of the integrated water injection intelligent device is based on the mechanical design of the bridge eccentric and efficient measuring and regulating process pipe string,including the downhole integrated intelligent water distributor and the fishing type measuring and regulating instrument.The integrated digital multi-information measuring and regulating technology,remote data transmission technology and radio energy transmission technology are integrated to complete the electromechanical design.The specific contents are as follows :(1)optimize the pipe string structure and solve the sealing problem of the circuit module in the water distributor through the "single seal" cavity structure;The pressure balance design of the numerical control plug is carried out to reduce the torque requirement of the motor.According to the complicated downhole environment,the miniature vortex flowmeter is designed to meet the accuracy requirements of downhole flow measurement.(2)designed a downhole measurement and control system based on STM32 MCU as the core controller to realize automatic flow control;Dc power carrier technology and LORA short range wireless communication module are used to combine the "wired + wireless" remote data transmission mode.Based on the principle of electromagnetic induction,a radio energy transmission device is developed to ensure the stable operation of the water distributor in the well for a long time.Finally finish the PC software design of control system,and use the development flow of indoor comprehensive test-bed,respectively,to a high temperature circuit debugging device of water injection,data transmission and acquisition performance testing,vortex street flowmeter calibration,CNC can plug opening adjustment and radio transmission performance test,and each module alignment testing.The flow distribution performance of the water injection device was verified by simulating the water injection environment of two layers in the underground with a comprehensive test bed.The test results show that the water injection device's measuring and adjusting system is stable and reliable,achieves intelligent regulation of flow rate,and has high adjustment accuracy,greatly improves injection and production efficiency,and has a good application prospect in oil field.