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