Distributed temperature sensing (DTS) is the most common fiber-optic measurement used for steam-assisted-gravity-drainage (SAGD) reservoir monitoring. In 2013, Devon Canada installed DTS in the trial production well at its Jackfish 2 asset. DTS was installed parallel to existing standard instrumentation. In early 2015, a distributed-acoustic-sensing (DAS) fiber-optic line was added in parallel along with multimode optic fiber, allowing simultaneous logging of DTS and DAS. DAS helped to improve confidence in and extend the definition of wellbore effects observed with DTS.
DTS with a fiber-optic cable has been established as a reliable and tested method for monitoring thermal wellbores in heavy-oil production. For its part, DAS has been established as a valuable diagnostic tool in unconventional reservoirs as a completion, stimulation, and production-monitoring tool. DAS interrogators turn a fiber-optic line into an array of thousands of virtual microphones, picking up acoustic signatures across a broad range of frequencies. In SAGD production, DAS has generated significant interest throughout the industry as a potential new reservoir-monitoring tool....
SAGD and Fiber-Optic Distributed Acoustic and Temperature Sensing
20 August 2016