Well integrity is a result of technical, operational and organizational barriers applied, with the intention to contain and control the reservoir fluid and well pressures. Knowledge of well integrity status at all times enables the companies to take the right actions to prevent incidents. If a well barrier has failed, the only action that has to be done in a well is to restore the failed barrier. Because failure of well integrity (barriers) could lead to catastrophic events, like demonstrated in the Gulf of Mexico in 2010, with the Deepwater Horizon incident. Unfortunately, this is not an isolated case, there are a number of another serious incidents happened due to loss of well integrity in the Oil and Gas Industry.