Calculation and Analysis on Thermodynamics Calculation of Nature-gas Pipelines with Electric Heat Tracing

摘要

In order to restrain the hydrate formation in the gas transmission pipeline, according to the heat transfer theory of fluid in the circular tube of multilayer cylindrical wall, comprehensively considering many factors such as earth temperature variation, natural gas physical property and so on, we theorized numerical method and computational formula of thermodynamic calculation of buried electric heat tracing gas transmission pipeline, which are used to the field calculation. The results show that the outlet temperature of pipelines with electric tracing ribbon has a sensible rise, and the minimum is 3.8°C, under the conditions given in this paper, the maximum ups to 19.8°C, the relative percentage error between calculation results and actual measurement values is less than 5%, so we can concluded that the derived temperature drop formulas and the calculation software can totally meet the requirement in oilfield production.