The Study On Oilfield SCADA System Based On Wireless Ethernet

In the oilfield development, production machines are often distributed in the surrounding countryside environment. The main production areas are more scattered. The establishment of Supervisory Control and Data Acquisition (SCADA) systems will be able to make the production and management and master control in a timely and dynamic production, the entire production process automation.There are many common ways of remote control, such as field bus and wireless digital radio stations. With the rapid development of information technology, the modern enterprise requirements from the scene to control the management to achieve a comprehensive and seamless information integration, and provide an open framework for the foundation, but the present Field bus not yet completed these requirements, if we use wireless digital radio-way monitoring oil fields, the need for the occupation of wireless communication channel, to achieve reliable communication, the need for larger one-time investment. With the rapid development of internet, Ethernet based on TCP/IP are gradually widely used in monitoring system by virtue of its low cost, high speed communications, global universal standards.The paper rely on BoChen Company of Jilin Province "The remote monitoring system of parameters wells based on the Wireless Ethernet"research projects. The introduction of WiMAX wireless access technology, study a project which is based on wireless Ethernet oil Supervisory Control and Data Acquisition System and on the application of key technologies and expansion were discussed. The system uses high integration rate processor MC9S12NE64 which Freescale Corporation provides to take the first floor master control chip. Expands TLC2543 through SPI the AD transformation chip and the internal ATD module realizes the multi-precision data acquisition plan. Applying the embedded Ethernet and the wireless WiMAX technology realizes the remote terminal gathering data Ethernet transmission.System basic processes: oil terminals responsible for collecting the work of the state oil data, or other serial data collection instrumentation; data collected by the end of the communications equipment on the instructions sent to the upper monitor centre, treated deposit real-time database; Monitoring Centre user applications to access real-time database access to data when the order to launch control center operations, first through the application process, and then notify the Ethernet communications equipment sent by the corresponding command word, the terminal under orders include the address information control equipment at the scene.MC9S12NE64 is a 16-bit microcontroller, with third-party TCP/IP protocol stack match, and then use Metrowerks CodeWarrior development tools of the rapid design, may realize the low cost terminal node Ethernet solution. It has high integration, simple structure and high flexibility. The software can be configured characteristics and can realize large amounts of data acquisition and high-speed data transmission directly to the specific application of efficient support.In addition to general data acquisition mode, in the field via RS-485 or RS-232 connected computer terminals or other serial instrumentation are also popular. SCI extended through the RS-232 interface, so that such existing serial instrument more easily access. The RS-485 bus from a pair of simple twisted pair line distributed a system. Serial devices such instruments could be via RS-485-RS-232 conversion, multi-point, two-way communication and data collection, simple equipment, anti-noise differential transmission.WiMAX based on the IEEE802.16 standard, and it is a realization of long-distance high-speed transmission of wireless communication technology. Its largest transmission speed of 75 Mbps, the largest transmission distance of up to 50 km, mainly for the Internet connection service access lines. The paper has made the related debugging for the system in the Internet of Jilin Mobile WiMAX trials. The Remote Control terminal MC9S12NE64 is at the core of the embedded system. TCP/IP is a relatively large group of the protocol. It has hundreds of network protocols. GM's computer system has sufficient resources to support the core communication protocols to achieve, but because embedded systems CPU processing power and storage system capacity constraints, the need for TCP/IP protocol appropriate to streamline.OpenTCP protocol stack open source projects on NE64 made the corresponding optimization. To achieve all protocol layer independent of each other, between the upper and lower transparent data transmission between the library through a series of data transfer function. Guidelines adopted at the same time operating system, rather than copying the data, the MAC sub layer will be the buffer zone along the data transfer protocol stack up, the realization of a zero-copy data. Reservations in the protocol stack in the ARP, ICMP, TCP, IP core agreement, directly through the application layer for data acquisition applications. Terminal software is including of data collection, the Ethernet driver OpenTCP agreement transplantation and so on. Control Center software system and the main user dialogue function. In this part of the software, you can check network status, sending initialization terminal equipment orders, upon receipt of the terminal back to the "ready" order feedback, the Centre sent the data transfer order, send data to notify the terminal centre. After receipt of data, data processing, and voice, text, images, and the result will be displayed.Software design is the focus of a thorough analysis of its functional modules settings and the organization, its main function module is the network communication modules, database modules, image processing modules, alarm monitoring and statistics, such as print output module.This paper proposes a building based on Ethernet Remote Monitoring and Data Acquisition System applications. The system includes Universal Data Acquisition model can be used in all types of sensors collecting well, while extending the RS-232 interface, serial and other instruments have better compatibility. OpenTCP protocols stack on the TCP / IP protocol to streamline the realization of a low-cost Ethernet access. The system has been in the wireless Internet access WiMAX experimental realization of a wireless Ethernet debugging. With WiMAX in the domestic application of the system will be suitable for monitoring oil.