CN-121994425-A - Infrasonic wave leakage monitoring system evaluation method

CN121994425ACN 121994425 ACN121994425 ACN 121994425ACN-121994425-A

Abstract

The invention discloses an infrasonic wave leakage monitoring system evaluation method, which relates to the technical field of pipeline defect detection and comprises the following steps of performing system self-checking on a monitoring system to obtain self-checking index parameters, performing normal operation condition simulation leakage test at a simulated leakage point, recording normal operation condition simulation test data, performing abnormal operation condition simulation leakage test at the simulated leakage point, recording abnormal operation condition simulation test data, carrying out statistics on the basis of the normal operation condition simulation data and the abnormal operation condition simulation test data to obtain technical index parameters of the monitoring system, carrying out validity test on each sensor of the monitoring system to obtain validity index parameters, carrying out leakage signal simulation test on the monitoring system to obtain signal index parameters of the monitoring system, and judging whether the performance of the monitoring system is qualified or not based on the self-checking index parameters, the technical index parameters, the validity index parameters and the signal index parameters. The invention can accurately evaluate the effectiveness of the technical index of the leakage monitoring system.

Inventors

ZHONG XUE
ZHANG WENYAN
TANG PING
DENG ZIWEI
Qi Jiage
PANG YU

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (13)

1. An evaluation method of an infrasonic wave leakage monitoring system is characterized by comprising the following steps: performing system self-checking on the infrasonic wave leakage monitoring system to obtain self-checking index parameters; After confirming the running condition of the infrasonic wave leakage monitoring system, determining a simulated bleeding point; performing normal operation condition simulation leakage test at the simulated release point, and recording normal operation condition simulation test data; Performing abnormal operation condition simulation leakage test at the simulated bleeding point, and recording abnormal operation condition simulation test data; Based on the normal working condition simulation data and the abnormal working condition simulation test data, calculating to obtain technical index parameters of the infrasonic wave leakage monitoring system; Performing validity test on each sensor of the infrasonic wave leakage monitoring system to obtain validity index parameters; performing leakage signal simulation test on the infrasonic wave leakage monitoring system to obtain signal index parameters of the infrasonic wave leakage monitoring system; and judging whether the performance of the infrasonic wave leakage monitoring system is qualified or not based on the self-checking index parameter, the technical index parameter, the validity index parameter and the signal index parameter.
2. The method for evaluating an infrasonic wave leakage monitoring system according to claim 1, wherein when the infrasonic wave leakage monitoring system is subjected to system self-test, each natural gas pipeline covered by the infrasonic wave leakage monitoring system is subjected to system self-test.
3. The method of evaluating an infrasonic wave leakage monitoring system according to claim 2, wherein performing a system self-test on the infrasonic wave leakage monitoring system comprises the steps of: Under normal working conditions, based on the simulated leakage section of the infrasonic wave leakage monitoring system, simulated leakage is carried out in at least two interval sections; And developing system self-checking under abnormal working conditions.
4. A method of evaluating an infrasonic wave leakage monitoring system according to claim 3, wherein the interval between two adjacent simulated bleeding operations is greater than 3 minutes.
5. The method for evaluating an infrasonic wave leakage monitoring system according to claim 3, wherein the abnormal working condition is that the infrasonic wave leakage monitoring system is offline and disconnected from an explosion proof box.
6. The method of claim 1, wherein identifying an operational condition of the infrasonic wave leakage monitoring system comprises the steps of: closing the safety distance of each sensor, and confirming the running condition of the pipeline; setting a warning zone range and a safety zone; Installing and checking a temporary bleed system; The high pressure hose and the absorption device were inspected.
7. The infrasonic wave leakage monitoring system evaluation method of claim 6, wherein the steps of installing and checking the temporary bleed system are: closing a ball valve of the on-site pressure gauge, and dismantling the pressure gauge according to an operation rule; installing a high-pressure ball valve for testing at an original pressure gauge interface; installing a simulated leakage testing tool at the other end of the ball valve of the pressure gauge; connecting a high-pressure hose to the tail end of the simulated leakage testing tool, and fixing the high-pressure hose; And closing the high-pressure ball valve for test, and opening the ball valve of the original pressure gauge to perform leak detection.
8. The method for evaluating an infrasonic wave leakage monitoring system according to any one of claims 1 to 7, wherein the simulated bleeding point includes a test point and a new test point, the new test point is located in a corresponding sensor monitoring range, and the new test point is located on a main pipeline.
9. The infrasonic wave leakage monitoring system evaluation method of claim 8, wherein the normal operation condition simulation leakage test includes the steps of: changing station alkali liquor according to the on-site sulfur content; closing a ball valve of the corresponding instrument, removing a pressure relief plug of the corresponding instrument, and installing a high-pressure ball valve for testing in a pressure relief opening of the corresponding instrument; Installing a simulated leakage testing tool at the other end of the high-pressure ball valve for testing, and connecting an outlet of the leakage testing tool into a corresponding alkali liquor container; closing the high-pressure ball valve for test, conducting the pressure guiding flow of the corresponding sensor, opening the ball valve of the corresponding instrument to detect leakage of the vent pipe, reconnecting the pipeline if leakage exists, and detecting leakage again after reconnecting the pipeline each time; simulating pipeline rupture leakage, and recording normal working condition simulation test data; repeating the step of simulating the pipeline rupture leakage for a plurality of times after the preset time interval; and replacing the test points for testing until all the simulated bleeding points are tested.
10. The infrasonic wave leakage monitoring system evaluation method of claim 9, wherein the abnormal operation condition simulation leakage test includes the steps of: And after the 1 sensor is removed, performing the normal operation condition simulation leakage test.
11. The infrasonic wave leakage monitoring system evaluation method of claim 10, wherein the abnormal operation condition simulation leakage test further includes the steps of: and disconnecting the server power supply of the infrasonic wave leakage monitoring system or disconnecting the network connection of the infrasonic wave leakage monitoring system, and then performing the normal operation condition simulation leakage test.
12. The method of claim 8, wherein testing each sensor of the infrasonic wave leakage monitoring system for effectiveness includes testing the capacitance and resistance of each sensor.
13. The method for evaluating an infrasonic wave leakage monitoring system according to claim 8, wherein the step of performing a leakage signal simulation test on the infrasonic wave leakage monitoring system comprises: at least one point is selected from any position of the upper, middle and downstream of the pipeline; connecting the infrasonic wave generator with a pipeline in the pipeline test pile; the test is carried out by transmitting various infrasonic waves with the same frequency band below 20 Hz through an infrasonic wave generator.

Description

Infrasonic wave leakage monitoring system evaluation method Technical Field The invention relates to the technical field of pipeline defect detection, in particular to an evaluation method of an infrasonic wave leakage monitoring system. Background The pipeline is used as a main transmission medium for energy transmission, is one of important infrastructures, and has the characteristics of large, continuous and rapid transportation. The total length of the built oil and gas pipeline in China breaks through 9.5 kilometers, and after the pipeline has leakage fault, only the leakage condition is found in time and the position of the leakage point is found accurately, so that the economic loss and environmental loss caused by leakage can be reduced to the minimum. Therefore, the pipeline leakage monitoring work is carried out by an effective technical means, the running condition of the pipeline can be accurately mastered, and the natural gas leakage risk management and control capability is improved. In recent years, on the basis of a conventional fixed gas detector and manual inspection, various passive prevention technologies such as an infrasonic wave leakage monitoring technology, a pipe network sentinel monitoring technology, a laser methane inspection monitoring technology and an infrared gas cloud imaging technology are introduced for gas leakage monitoring. The system is mainly applied to long gathering and conveying pipelines due to slower attenuation and long propagation distance of infrasonic wave energy, is mainly installed in stations with large gathering and conveying quantity such as a dewatering station and a gas collecting main station so as to monitor leakage in the stations, is mainly applied to fixed monitoring of key areas in complex environments by using pipeline whistle detection technology, is mainly applied to large-area rapid detection of a pipeline network by using vehicle-mounted high-precision laser detection technology, is generally applied to daily inspection of pipelines, stations and high-consequence areas by using a handheld laser methane detector as an auxiliary detection means, and is generally applied to large-scale chemical plants or large-scale storage tank areas by using infrared gas cloud imaging leakage detection technology. And in-service pipeline leakage monitoring mainly adopts an infrasonic wave leakage monitoring system. The accuracy of the infrasonic wave leakage monitoring system is mainly influenced by the external environment and the internal system, wherein the external environment influence comprises point selection, coverage range and the like, and the internal system influence comprises the effectiveness of software and hardware facilities such as data acquisition, signal transmission, analysis and processing and the like. Meanwhile, the verification test of the infrasonic wave leakage monitoring system lacks corresponding detection means and methods because whether the installation equipment meets the design requirement or not can not be detected by damaging a pipeline from installation and transportation to daily detection, is currently detected by a manufacturer, cannot realize technical control before transportation in production, lacks guidance of daily operation management, and has great field test limitation. Disclosure of Invention Aiming at the technical problem that the existing infrasonic wave leakage monitoring system is difficult to perform on-site effective test before operation so as to accurately evaluate the technical index effectiveness of the leakage monitoring system, the invention provides an infrasonic wave leakage monitoring system evaluation method. The invention is realized by the following technical scheme: The invention provides an evaluation method of an infrasonic wave leakage monitoring system, which comprises the following steps: performing system self-checking on the infrasonic wave leakage monitoring system to obtain self-checking index parameters; After confirming the running condition of the infrasonic wave leakage monitoring system, determining a simulated bleeding point; performing normal operation condition simulation leakage test at the simulated release point, and recording normal operation condition simulation test data; Performing abnormal operation condition simulation leakage test at the simulated bleeding point, and recording abnormal operation condition simulation test data; Based on the normal working condition simulation data and the abnormal working condition simulation test data, calculating to obtain technical index parameters of the infrasonic wave leakage monitoring system; Performing validity test on each sensor of the infrasonic wave leakage monitoring system to obtain validity index parameters; performing leakage signal simulation test on the infrasonic wave leakage monitoring system to obtain signal index parameters of the infrasonic wave leakage monitoring system; and judging whether the performance