A casing leak survey in the Hugoton Gas Field was made to obtain information with which the casing corrosion problem could be evaluated and the most severely affected areas located. It was determined that leak frequency was relatively low but that leaks usually resulted in decreased deliverability or loss of the well. Because the pool is expected to be productive for another 30 years, the seriousness of the problem was not reflected entirely by current leak frequency.
Work to date indicates current application based on indications derived from surface potential measurements is sufficient to protect the wells and that the required current is obtainable from galvanic anodes. This latter fact is important because each well is located in the center of a section.
Interference from rectifier installations has been found in the field, presenting a new problem in efforts to protect casing cathodically from corrosion. 8.4.3
