Numerical Modelling Of Cathodic Protection
Systems For Deep Well Casings
Author(s)
A. B. Peratta, J. M. W. Baynham & R. A. Adey
Abstract
This work is focused on the 3D simulation of cathodic protection (CP) systems
for metallic deep well casings immersed in stratified soil. The soil is considered
as a multi-layered electrolyte with electric conductivity, which varies from layer
to layer. Given a CP system, the aim of the simulation is to predict the level of
protection (including the normal current entering the structure) against corrosion
along the well casing. It is common practice to fill the annular space between soil
and metallic structure with cement along the whole depth. The paper presents a
modelling approach which incorporates this feature. In addition, a unique CP
system may be used to protect more than one well. In this case, the simulation is
used to analyse problems of interference and load unbalance to the electrical
resistance in the power lines and flow lines. The modelling approach is aimed at
simplifying the model design, especially for dealing with multi-layered
electrolyte, and improving the accuracy over existing traditional techniques,
which entail a detailed and time consuming representation in the model of the
interfaces between different layers of the electrolyte. The effects of different
scenarios of electrolytes on the CP system are considered.
Keywords: cathodic protection, Boundary Element Method, deep well casings.
Keywords
cathodic protection, Boundary Element Method, deep well casings
Related Book
Other papers in this volume
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