The "Five Colored Stone" pipeline leak detection system is a set of leak detection system that has gradually matured during anti-theft oil activities in Shengli Oilfield. The system uses a combination of "pressure point analysis and differential transmission analysis" to monitor pipeline leakage. After more than six years of continuous research and 42 pipeline operation practices, the system has gained rich experience and lessons. At present, the system is relatively mature, stable and reliable, and several cases of oil spills have been discovered, which have produced significant results in production.
1, the scope of application The leak detection system is suitable for pure liquid delivery pipeline (such as crude oil, oil and water mixture, diesel, benzene, sulfuric acid and other media).
2, the system function 1 real-time monitoring of pipeline leakage, can automatically alarm, positioning.
2 Real-time comparison of instantaneous loss, cumulative loss, and leakage.
3 historical data storage analysis.
3ã€Technical principle Pipeline leak detection system adopts the method of monitoring the pressure wave, temperature and flow rate at both ends of the pipeline to realize alarm, based on the principle of “pressure wave†positioning and “transport analysisâ€.
The so-called "pressure wave" principle means that when a leak suddenly occurs somewhere in the pipeline, a sudden pressure drop will occur at the leak, and this negative pressure fluctuation will propagate from the leak point to both ends at a certain speed. The sensor captures the waveform of a particular transient pressure drop, which is determined by software leaks. To achieve accurate positioning, it is necessary to accurately calculate the propagation velocity of the pressure wave in the pipe medium and the time difference between the upstream and downstream pressure sensors receiving pressure waves.
The basis of the differential analysis method is the liquid's incompressibility and conservation of mass. In real-time, we perform instantaneous loss in the software, 2 minutes loss, 10 minutes loss, 1 hour loss, 4 hours loss, 8 hours loss, 24-hour loss comparison, once the threshold is exceeded, the system will An alarm is issued but cannot be located.
4. System Configuration The system is a SCADA system with dynamic leakage monitoring capabilities. Real-time data acquisition, transmission and analysis processing enable online leak detection and positioning.
The WSS2000, a special collection module for leak detection system developed by Dongying Wushi Leak Detection Technology Co., Ltd., collects data (4 analog quantities, 4 digital quantities), GPS satellite clock signal timing, and communication (1 RJ45 port, 1 serial port, One 485) integrated together, the product runs stably, has applied for the national patent.
5. Technical indicators 1 The amount of leakage that can be detected by this system is 1% of the total output;
2 positioning error, ± 200 meters;
3 Leak Detection Positioning and alarms are completed within 2 minutes after the leak has occurred.
The system ranked first in several similar systems in Shengli Oilfield, and won the first prize for scientific and technological progress in Shengli Oilfield in 2001, and won the third prize for scientific and technological achievements in national safety production in 2002.
6. Application The system has been promoted in more than 50 oil pipelines with a total length of more than 1,000 kilometers, including the Oil and Gas Gathering Plant of Shengli Oilfield, Qinghe Oil Production Plant, Binnan Oil Production Plant, Petrochemical General Plant, Ocean Oil Production Plant, and Jiangsu Oilfield. Applications: The medium that has been used for on-site application includes: crude oil, oil-water mixture, diesel oil, concentrated sulfuric acid (93%) and other media. It is currently the most widely used, most mature and reliable, and best applied leak detection system in domestic oil fields. Leading position in China.