Calculating method of equivalent pipe length of telescoping pipeline

Abstract

The invention discloses a calculating method of the equivalent pipe length of a telescoping pipeline. The method includes steps: establishing a sound wave amplitude attenuation model and a straight tube segment leakage sound wave amplitude attenuation model; obtaining gas operation parameters in a straight tube segment, and calculating a straight tube segment sound wave amplitude attenuation factor according to the gas operation parameters in the straight tube segment; obtaining an installation distance of two sensors, acquiring leakage sound wave signals of leakage sound waves spreading through a telescoping pipeline segment, and extracting a leakage sound wave signal amplitude; introducing the leakage sound wave signal amplitude and the straight tube segment sound wave amplitude attenuation factor into the sound wave amplitude attenuation model, and obtaining a sound wave spreading distance; and calculating the equivalent pipe length of the telescoping pipeline according to the sound wave spreading distance in step 4 and the installation distance of the two sensors in step 3. The beneficial effects of the calculating method of the equivalent pipe length of the telescoping pipeline are that the equivalent safety distance of the sensors can be obtained through the establishment of the calculating formula of the equivalent pipe length of the telescoping pipeline, and the positioning precision is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas pipeline leakage monitoring by acoustic wave method, in particular to a method for calculating the equivalent pipe length of a variable diameter pipe. Background technique [0002] At present, there are many leakage monitoring methods that can be applied to oil and gas pipelines. Among them, the acoustic wave method has many advantages compared with the traditional mass balance method, negative pressure wave method, and transient model method: high sensitivity, high positioning accuracy, and false alarms. Low rate, short detection time, strong adaptability; the measurement is the weak dynamic pressure change in the pipeline fluid, which has nothing to do with the absolute value of the pipeline operating pressure; the response frequency is wider, the detection range is wider, etc. [0003] In the research on the leakage detection and location technology of the gas pipeline acoustic method, the ...

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Problems solved by technology

[0007] The existing patents are less involved in the calculation of the installation distance between the upstream and downstream sensors, and the improvement of the leak location accuracy relies more on the method of improving the sound wave propagation speed and time difference. There is no description of the change in the installation distance between them. The specific performance is: insufficient consideration of the reflection, secondary reflection and interference of the sound wave when the sound wave encounters the reducing tube during the propagation process, which makes the attenuation of the sound wave amplitude significantly increased. Large, so that the calculation of the installation distance between the upstream and downstream sensors is inaccurate, resulting in leakage positioning errors

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