Theoretical Model of Electromagnetic Field Propagation in a Well

The PrimeGeo company has developed a theoretical model to describe field propagation in a well while performing electromagnetic flaw detection (corrosion logging). The model can separately calculate thickness of production tubing and casing strings under condition of a multi-barrier well structure. Some model results are shown below.

 

Fig1_1-2-3 pipes comparison

Fig. 1. Model of electromotive force decay (in logarithmic scale) with time for a various number of piping.

Fig2a_pipe_palette_early_timesFig2b_pipe_palette_mid_timesFig2c_pipe_palette_late_times

Fig. 2.Diagram of electromotive force contour lines in different time periods relative to thickness d1 of the first piping and its magnetic permeability µ. Each contour line corresponds to a fixed electromotive force value.

Fig3a_pipes_palette_early_timesFig3b_pipes_palette_mid_timesFig3c_pipes_palette_late_times

Fig. 3. Diagram of electromotive force contour lines relative to thickness d1 and d2 of the first and second piping. Each contour line corresponds to a fixed electromotive force value.

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