Research On Data Transmission Oriented To Multi-nodal Distribution Flow Control Valve

In order to realize the sustained high yield of oil,it is required to change water injection layers frequently to regulate the water injection flow.In the existing injection process,the mechanical costing and fishing method is the main way for water injection flow regulation.This method,not only is low efficient and with high failure rate of the water injection equipment,but also is difficult for real-time detection and feedback for state information of injection layer.There exist several problems of layered water injection technology,such as:the great difficulty of mechanical improvement,the slight effect of water injection,and the low level of automation for multi-level combined adjustment,which make it difficult to meet the needs of real-time control and monitoring for oil field production.Moreover,the intelligent well system is started late in China,leading to the less accumulated technology and high implementation costs.Consequently,it is necessary to develop a kind of low cost,versatile communication system for intelligent measuring and adjusting technology.In this paper,a data transmission system suitable for multi-nodal distribution flow control valve is designed,which is used for ground control system to implement remote real-time control and monitoring on different levels of water injection device.In order to reduce the cost and technical difficulty of the cable laying,the data and power are transmitted through the power cable between the ground system and downhole equipment,based on power-line carrier transmission.Using DSP chip which has strong data processing capability and rich peripherals,to complete state information detection & Handling and flow control of water injection layer.In this design,the compact circuit is designed to meet the space requirements of flow control valve stenosis cabin.Firstly,in order to satisfy the real-time monitoring for the multi-node equipment and the narrow installing space of the hardware system,the overall scheme is proposed with multi-node communication network and compact hardware system.Secondly,in order to facilitate system expansion and migration,the whole system is divided into the main control system module,carrier communication module,and power supply module using the modular design methods.The control system module adopts DSP28069 as the main control chip to complete the control programming,data analysis &processing,and communication protocol design.The carrier communication module can build the reliable communication between the main controller and cable channel,using the carrier chip ST7538 based on FSK.According to the system power requirements,a low power electric power conversion circuit is designed for the power supply module,achieving the energy-saving power supply.Finally,the prototype of the communication system is completed,and tested on indoor simulation experiment and temperature resistance in the laboratory.The tests yield satisfying results: each function module of the system works normally,the data transmission for multi-nodes equipment based on master-slave communication is realized.The task requirements are preliminary achieved,and also the basis are provided for the future functional perfection.