The general subject of well integrity has been the focus of industry attention since the early-1990s. There has been much thought given to the design, testing, diagnosis and tracking of various barrier elements and barrier envelopes for new drills. This work will doubtlessly be beneficial in the future. Little attention, however, has been given to well integrity on existing wells, many of which are in the latter portion of their life cycle.
This presentation deals with issues involving work on late-life wells. Workovers, recompletions, abandonments, and re-entries of abandoned wells still require some level of well integrity to prevent leaks during the work and after they are returned to service. It is clearly too late to install original barrier systems in many wells. So, what level of well integrity is required for these jobs, and how does one ensure that sufficient well integrity exists before job initiation?