Fitting and circuit modeling to the attenuation characteristics of logging cable

2017 2nd International Seminar on Advances in Materials Science and Engineering

Yan, Jingfu^1 ; Zou, Qingyan^1 ; Liu, Dejun^1

China University of Petroleum, Beijing

102249, China^1

关键词: Analytic expressions;    Attenuation characteristics;    Attenuation measurements;    Cable attenuation;    Circuit modeling;    Discrete frequencies;    Lumped parameter circuits;    Nonlinear fitting method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/231/1/012053/pdf
DOI  :  10.1088/1757-899X/231/1/012053

来源: IOP

【 摘 要 】

In order to get a previous understanding about data transmission effect through a long well-logging cable (about 7000 m), a lumped parameter circuit simulating the attenuation characteristics of well-logging cable was designed in this paper. Based on the actual attenuation measurement at every discrete frequency point, the analytic expression of transfer function of the cable was firstly obtained by nonlinear fitting method, then a physically realizable circuit model corresponding to the transfer function was thus established. According to the simulation results, the circuit model shows good fitting effect to the cable attenuation characteristics.