A Research Of Supervisory Control And Data Acquisition System For Sebei Gas Field

In recent years, with the deepening of exploration and development and technical level, Qinghai chaidamu gas reserves has made significant development, already building100x108Nm3/a of natural gas production scale. After years of development, SeBei Gas field has built Sebei the1st, the2nd and Tainan three gas fields, a total of15gas gathering station,632natural gas wells and7gas pipeline. In order to ensure the gas field and pipeline belongs safe, stable, economical to run, we need to build a whole automation control systems.Sebei Gas field automation control system using SCADA systems, namely, data acquisition and control system, It is based on computer-based production process control and SCADA systems, operating equipment on-site monitoring and control, data acquisition, device control, measurement, parameter adjustment and a variety of signal alarm and other functions. SCADA system architecture planning at three-tier model, the monitoring center, the regional control center, station control system. Monitoring center to complete the gas field and pipeline belongs centralized scheduling management. Regional control center complete the field and belongs to the centralized management of gas pipelines. Station control system to complete the internal management control station. SCADA system through the construction of complete and ultimately can be achieved on the entire field of production control and management.I for the specific process of Sebei gas field, introduces the overall SCADA system design requirements, architecture design, equipment selection, feature development, and specifically on the wellhead control system design, station control system design, PC HMI software design part of the detailed description.Section at the wellhead control system design, first introduced gas field wellhead characteristics. A total of15gas field gas gathering stations, gas stations under the jurisdiction of each set of wells ranging from30-60, which is characterized for each wellhead gas gathering station for the large number of parameters to be collected but only wellhead include:wellhead tubing pressure, wellhead casing pressure, wellhead temperature, relatively speaking, simple process, data collection easy. Designed according to its characteristics of high cost equipment, which adopts Beijing Dragon Resource Technology Co., Ltd. has independent intellectual property rights DRAC-100RTU as wellhead control system controller. After highlighting the DRAC-100controller performance, features, hardware configuration, etc., introduced the solar-powered system components and features. After that, based on the DRAC-100describes the detailed design of wellhead control systems, including hardware design that is available for the design of integrated hardware devices, specifically including:Cabinet layout design, the final form cabinet layout; terminal layout design, the final form wiring diagram; communication design, the final adoption of digital radio using MODBUS protocol for wellhead gas gathering station to the data communication. In the station control system design part, first introduced gas field gas gathering station process and control parameters, measurement and control requirements. Combining technology and production requirements, station control system is mainly used to collect signal, such as pressure, temperature, level, flow, etc., and control valve, part of the equipment needed to do chain control, including:the valve control logic, into the station emergency shut-off valve and pressure drop rate of chain logic, emergency shutdown station logic separator drain valve and level chain logic, combustible gas alarm with axial fan interlock logic, and the need for standard orifice flowmeter program. Station control system according to the characteristics of its main equipment should include:redundant RTU as a process control unit master controller, remote10, PC software for data acquisition, database management, control commands issued, monitoring alarms and events, reports, trends, human-computer interaction and other functions, and other auxiliary equipment, such as the control room cabinets and accessories, on-site proof junction box and accessories and so on.According to system performance requirements, chose the United States Emerson’s BB’s CCRS redundant controller as the main controller, chose BB’s Remote IO module as Remote IO module using field data collection, chose Honeywell’s PKS Software as HMI software. After is introduced the CCRS features, performance. After further highlights the station control system hardware design, including the RTU control cabinet design, forming a RTU cabinet design,220VAC allocation map,24VDC allocation map; proof junction box design, forming a proof junction box design; server rack design, forming a server rack layout. After that, focuses on the station control system and control program development environment OPENBSI software development environment and the use of OPENBSI station control system for monitoring and control procedures specific design, including data collection procedures, data conversion process, the valve control procedures, the drain valve and level interlock program, furnace room combustible gas alarm with axial fan interlock program flare ignition process, orifice flowmeter flow calculation procedures, ultrasonic flowmeter temperature and pressure compensation calculation procedures, the cumulative flow procedures, and communication with PKS.HMI software in the host computer design parts, first focusing on the U.S. Honeywell PKS software, as well as a PC HMI PKS software development environment with the characteristics, including:Microsoft’s Windows operating system-based servers, using high-speed dynamic cache collect real-time data to provide alarms, display operation, historical data collection, reporting, reporting and other services; HMIWeb technology is based on open industry standard html file formats and access to the Web browser interface to provide users with an advanced security man-machine interface; provides300standard screen, the user can manipulate these images and create your own desired operation screen; integrated online documentation; integrated network; based on client/server architecture for multiple real-time database an operator station applications while providing a variety of data and so on. Then describes how to use the software to complete PKS data read, draw pictures, alarms, trends, history, storage and other functions, including the use of QuickBuilder complete data acquisition configuration; using complete HMI HMI Display Builder draw; view the event log using the Station achieved, view alarms, view trends, view historical trends and other functions.Finally, this paper describes the features and operation of the system using the results, the system described in this article in the gas field production applications, since the December2012production date, system stability, effectively captured the scene of various types of data, and can be PC control of field devices, there is a chain of emergency protective function can also be started normally, flow calculation accuracy, to achieve the desired purpose, by the user’s praise.