Although early corrosion detection may allow preventive maintenance to reduce the risk of environmental damage and surface incidents (explosion, fire, leakage, and related consequences), many of the wells producing today were completed decades ago, when corrosion control and monitoring were not a primary concern. Even with today's technological advances, corrosion cannot be completely prevented, but it can be controlled and minimized through proper planning, monitoring, and maintenance.
Middle Eastern operators have experienced varying degrees of casing completion failures in recent years due to common highly corrosive, water-bearing zones across shallow depths. The electromagnetic (EM) pipe inspection tool provides critical monitoring for evaluating casing integrity by locating, identifying, and quantifying damage and corrosion. Failure to address potential corrosion attack can impact well profitability as operators must respond by implementing extensive and potentially expensive restoration methods. Not only does mitigation increase operating expenses, it may force operators to shut-in well production for unplanned periods of time.
The immediate aim of the examples presented in this paper is to understand the levels of corrosive damage that are present in the wells; that have serious repercussions on the flow efficiency of completions. This assessment of well integrity investigations is used to identify any extensive corrosion in the outer casing before it penetrates through the inner casings. The provided field examples were logged rigless to establish the condition of multiple pipes. Corrosion intervals were suspected of being responsible for reducing well performance and killing the wells. Casing metal loss (ML) evaluations assisted in identifying which wells need workover attention to avoid excessive loss in production, environmental pollution, repair costs, or accidents.