Study On Leakage Monitoring Of Natural Gas Pipeline Based On Distributed Optical Fiber Sensing Technology

Oil and gas pipeline transportation has become the lifeblood of global economic development,and it plays an indispensable role in the distribution of energy.However,with the construction of a large number of pipe networks,some serious problems have appeared in the pipelines,such as aging wear,punching and stealing oil and gas,pipeline pressure,geological disasters,etc.,which will cause damage to the pipeline,leakage accidents,safety and environment.Economic and other aspects have adverse effects.Therefore,the early warning and monitoring research on pipeline leakage is of great significance.The distributed optical fiber monitoring technology has many advantages.Since the material of the optical fiber is silicon dioxide and has a sheath protection on the outside,the optical fiber sensor has anti-electromagnetic interference capability,high dielectric strength,high resistance to corrosion and high voltage,and can be bad.The advantages of long-distance,distributed and accurate measurement under the environment can be buried in the ground with the pipeline and quickly and accurately monitor the location of the pipeline leakage.Leak detection on oil and natural gas pipelines is effective for the buried pipeline health information.Mastery.In this paper,two experiments were completed.Firstly,the method of monitoring the abnormal geological conditions around the pipeline was studied.This method can judge the existence of groundwater and underground cavities,and early warning of hidden dangers that may cause pipeline damage.Under the condition of the same surrounding environment,according to the difference of thermal conductivity of different media,the monitoring of the geological conditions around the pipeline will be transformed into realtime monitoring of the temperature after the fiber sensor is heated.Then,the indoor physical simulation of pipeline leakage monitoring is carried out.Based on Brillouin optical time domain reflection technology,the Brillouin scattering and Raman scattering principle are used to respond to the temperature information and strain information of the leak.A distributed detection scheme for pipeline leakage was realized,and reasonable suggestions were made for the shortcomings of the test.Some qualitative and quantitative conclusions obtained in this paper are helpful for pre-warning and post-mortem monitoring of pipeline leakage,but there are still many shortcomings in this test,mainly because the gas leakage time is too short,the test accuracy is not high enough,and FBG can be used later.The fiber optic demodulator is used to test the gas leakage for 30 minutes,accurately and completely displaying the gas leakage process in the underground.Figure 51 table 1 reference 74...