Corrosion on well casings can come in the form of general
corrosion or as more localized corrosion in areas where elements
such as aquifers, soil conditions or salt caps can accelerate the
corrosion rate. Cathodic protection has been used successfully for
decades as a means to protect casing strings in production and
Factors such as well depth, casing size, soil corrosivity and
electrical continuity must be considered during the design
process. Anode systems that are sized or installed incorrectly
can degrade rapidly, leading to premature depletion, requiring
replacement in order to adequately manage active corrosion.
Proper protection of well casings can provide years of trouble-free
operations and minimize required maintenance. Inspection
of the casings is generally expensive, with access for inspection
tools often limited by surface equipment and the casing hanger. A
purpose-built cathodic protection system prevents corrosion and
typically represents 1 to 3 percent of the cost of a well. Once installed, ongoing monitoring
of the cathodic protection system can be performed without
With over 40 years of experience in designing and installing
systems that provide long-term protection, Corrpro’s well casing
solutions meet both NACE and API guidelines and are very similar
to conventional deep anode groundbed (DAGB) systems.
adequate cathodic protection have far fewer leaks and failures
than unprotected wells.