Experimental Study On Pipeline Deformation And Leakage Monitoring Based On Optical Fiber Sensing Technology

Due to its long line length and wide distribution characteristics,oil and gas pipelines inevitably traverse all kinds of complex geological environments and their service environment is extremely poor.Our country has a vast territory,diverse landform,and various geological and man-made disasters occur frequently,which seriously affect the operational safety of the pipeline.Therefore,it is necessary to take effective measures to monitor the overall damage of long-distance buried pipeline structures such as large deformation and leakage to ensure the operational safety of pipelines during service period.Traditional pipeline monitoring methods are mainly point-based,such as manual inspection,infrared scanning inspection,non-destructive testing methods of wall parameters,acoustic principles,software-based detection methods,etc.These methods have high detection costs,poor real-time performance,low positioning accuracy,and large errors.Compared with the traditional monitoring methods,the optical fiber sensing technology has the advantages of being free from electromagnetic interference,corrosion resistance,and the ability to achieve continuous measurements of several tens or even hundreds of kilometers,which is advantageous for long-distance network and large-scale networks.Intelligent development requirements.Therefore,as a new sensor technology,fiber-optic sensor technology is a kind of pipeline safety monitoring method with great competitiveness and development prospects.The main work of this paper is as follows:1.The pipeline deformation experiment based on BOTDR-FBG technology was carried out,and the deformation of the pipeline was calculated using the conjugate beam method.2.An optimized sensor placement method is proposed to monitor the force in all directions of the pipeline,calculate the maximum strain and determine whether the pipeline is twisted,calculate the pipe torsion angle,and carry out experiments to prove the feasibility of the method.3.The pipeline leakage experiment based on BOTDR-FBG technology was carried out.The two conditions of single point leakage and simultaneous multi-point leakage of the pipeline were simulated respectively.The monitoring method was improved according to the experimental results and the monitoring accuracy was further improved.4.Aiming at the problem of leak detection in normal temperature pipelines,the pipeline leakage monitoring experiment with heating method was carried out to improve the monitoring accuracy of leakage at room temperature.