The “Five Colored Stone†pipeline leakage monitoring system uses the method of monitoring the pressure wave, temperature, and flow rate at both ends of the pipeline to realize the alarm, which is based on the combination of “pressure wave†principle positioning and “traffic difference 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 Alert.
An overview of a pipeline in Shengli Oilfield:
From the first station to the last station, there is an insertion point in the middle, which is 35 kilometers in length. The medium is crude oil and the starting pressure is 3.5 MPa.
The two-station data acquisition station consists of data acquisition WSS3000, pressure wave measurement instruments, and safety barriers. Leak Detection The WSS3000 is a special leak detection module developed by Wuxi Stone for pipeline monitoring. It consists of a data acquisition module and a GPS time collector. The GPS time collector collects the satellite's standard time signals for the leak detection system.
Plan design based on:
The basic data of the pipeline (such as: diameter, pressure, temperature, etc.) and the pipeline trend map.
System performance indicators:
The system realizes online leak detection and positioning through real-time data acquisition, transmission and processing. Historical leakage data can be stored through the SCADA system software, enabling historical data storage analysis of leaks. The remote terminal device transmits the collected flow rate, pressure and other parameters to the monitoring center, and carries out real-time monitoring of the operating conditions of the pipeline and a comparative analysis of instantaneous transmission loss and cumulative transmission loss. When the leak detection software detects a leak, an alarm is issued and the location of the leak is given. Its performance indicators mainly reflect:
1 The amount of leakage that the system can detect is 1% of the total output;
2 positioning error: ± 200 meters;
3 leak detection positioning and alarm are completed within 2 minutes after the leak occurs;
4 Alarm accuracy >95%.
In the pipeline operation after the installation of the system, the “Gaoshishi†pipeline leakage monitoring system can timely detect multiple oil thefts every year and captured a number of oil theft groups. The leaking monitoring system of the colored stone pipeline can effectively find oil theft, severely cracked down on the arrogance of the criminals and provided a reliable guarantee for the normal operation of the pipeline.