Distributed temperature and distributed acoustics deployed by Z-system are excellent for detecting leaks, flow behind pipe and flow out of zone.
Whereas traditional logging methods can only see a point in time, DFO means that all the well can be imaged at the same time. As a result there are not only significant time savings but also intermittent or dynamic leaks can be easily spotted or where an annulus has to be bled down to see a leak it can be seen instantly.
Both DAS and DTS can detect flow behind several pipes and DTS will show if produced or injected fluid has migrated out of zone, for example into the over-burden zone.