Crude oil conveying pipeline leakage detection system structure and leakage position detection method

Abstract

The invention discloses a crude oil conveying pipeline leakage detection system structure and a leakage position detection method. The structure comprises a pipeline upstream station structure and a pipeline downstream station structure, wherein an upstream pressure transmitter, an oil conveying pump frequency converter and an upstream flow meter are respectively arranged at a pipeline upstream station; the upstream pressure transmitter, the oil conveying pump frequency converter and the upstream flow meter are respectively connected to an upstream station built PLC; a downstream pressure transmitter and a downstream flow meter are respectively arranged at a pipeline downstream station, and the downstream pressure transmitter and the downstream flow meter are connected to a downstream station built PLC; and the upstream station built PLC and the downstream station built PLC are connected with a system assembly through a communication network by using a Modbus for TCP / IP. The system assembly can directly collect data of the upstream station built PLC and the downstream station built PLC.

Description

technical field [0001] The invention belongs to the technical field of oil and gas transportation, and in particular relates to a crude oil transportation pipeline leakage detection system architecture and a leakage location detection method. Background technique [0002] The traditional leak detection system based on the analysis of pressure signal and flow signal has similar basic components. The signal acquisition device is the special equipment and the main hardware cost of the leak detection system. The signal acquisition device mostly uses an independent RTU to realize data acquisition, communication and GPS. Time synchronization and other functions. The signal acquisition device is responsible for converting the current signal (4~20mA) of the pressure (or flow) transmitter into a digital signal, and transmitting it to the main computer of the monitoring system through communication methods such as Ethernet or serial port, and also receiving the synchronization signal ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, to provide a crude oil delivery pipeline leak detection system architecture and a leak location detection method, which overcomes the prior art 1: since multiple signal distributors are respectively connected to a signal acquisition device, The signal acquisition device is connected to the system software through the communication network. Due to the high cost and high cost of the signal distributor and signal acquisition device, the overall cost of the leak detection system is high, which increases the construction cost and maintenance workload, which is not conducive to popularization and application; 2: Since the sampling frequency of the signal acquisition device is 100HZ, the sampling frequency is relatively high. However, in practical applications, since the pipeline pressure usually changes slowly during leakage, collecting 10 signals per second can fully meet the needs of leak detection. Therefore, the existing signal The acquisition device causes a waste of resources; 3: The existing leak detection system is out of sync due to the limitation of the signal acquisition device; 4: The existing leak location detection method is difficult to calculate, and the accuracy of leak location prediction is not high.

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