The well decommissioning and abandonment is not only complex, costly, and critical for environment but is also a quickly growing problem for the entire oil and gas industry as the number of wells approaching end of field life is rapidly increasing. All that generates a massive assets management problem. Worse yet, in some of the wells considered as properly abandoned oil leaks are discovered many years later, sometimes polluting the drinking water aquifer or sea water. The well decommissioning procedures require a passive monitoring tool, helping to identify poor cement jobs and leaks.

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