Digitization For Long-Distance Oil Pipeline Leakage Detection Liang Wei lweimm@yahoo.com.cn China University of Petroleum, Beijing
1 Research Significance 2 Key Technologies CONTENTS 3 Digitization Pipeline 4 Leakage Database 5 Leakage Alarm 6 Conclusions
1 Research Significance Pipeline Information Pipeline covers a series of cities with many people, whose safety is very important. Leaks can be inevitably caused by internal factors or by external factors, which are needed to detect and locate rapidly and accurately. Traditional methods can not meet the needs of the complicated situation. Digitization has many merits that can be used for the leakage detection of long distance pipeline.
2 Key Technologies 3S-integration technolodies GIS (geographic information system ) GPS (global positioning system ) RS (remote sensing) where the main technology in pipeline leakage detection system is the first one-gis with its interface of digitization pipeline as follows (sees Digitization Pipeline in next sheet)
3 Digitization Pipeline The main interface of digitization pipeline where there are pipeline information such as pressure, flow rate, oil velocity, oil temperature, attitude etc. with the geographic information, thus we can quickly master the basic condition of pipeline.
4 Leakage Database Storage information in-out station pressure flow rate oil velocity oil temperature altitude Development platform SQL Server 2005 Windows Server 2003 C++ Builder6.0 Data format: BLOB In order to get comprehensive analysis and diagnosis result, the dynamic database also includes the information of data sampling frequency, sampling segments, sampling times and sampling accesses etc. In the next two sheets, the organization structure of dynamic database and the query interface of historical trend are shown.
Organization Structure 4 Leakage Database
Query Interface of Historical Trend 4 Leakage Database
5 Leakage Alarm Running Module Pumping stations, Valve chambers, etc. Pattern Recognition Alarm Leakage alarm flowchart Programming with ComGIS Analog Signal Input Real-time pipeline data collection Real Time Data Data processing Foundation Database Diagnosis Module Pattern Recognition Feature Extraction The digitization system receives the pipeline acquisition information, analyzes and processes the data via the powerful space analysis and data management function of digitization technologies. Leakage? N Leakage location Sound & light alarm
Leakage Location 5 Leakage Alarm Host Computer Data Acquisition GPS Receiver Data Processor v A B x Pressure Sensor L B t 1 t 2 the leakage position x is calculated by: X 1 ( L 2 t * v)
5 Leakage Alarm Development Tool and data structure Development Tool: ComGIS -- MapObjects The data structure in MapObjects is shown as follows : field name field type attribute description Station NO. Material Specification Elevation buried depth Coordinate Condition Medium Facilitie Float Char Char Float Float Float Char Char Char Pipeline monitoring station Pipeline construction material Length, width, diameter Elevation of pipeline station Buried depth of pipeline Geographic coordinate of station Pipeline transportation condition Crude oil or product oil Buildings etc.
Alarm Example 5 Leakage Alarm On May 23rd, 2007, this system captured the alarm information which was an effective alarm after field-proven.
6 Conclusions Digital system has been successfully put into use in West Crude & Product Oil Pipeline of China Petroleum, and has achieved good results. It has the following merits: Sensitivity Real time Accuracy Easy maintenance Adaptability high performance-price ratio
Acknowledgments This work was supported by Program for New Century Excellent Talents in China University and supported by CNPC Innovation Fund and supported by the National High Technology Research and Development Program of China (Grant No. 2006AA06Z238).