Diagnostic Tool for Unconventionals Evaluates Near-Wellbore Fractures
The authors of this paper describe a fiber-optic diagnostic method based on Rayleigh frequency shift that provides new insights about the characteristics of the near-wellbore region during production.
Fiber-optic (FO) monitoring in unconventional reservoirs has proved to be an invaluable diagnostic tool. Unfortunately, gaining detailed understanding of the near-wellbore fracture geometry or cluster or stage productivity through FO has proved to be more difficult. A new FO diagnostic method, distributed strain sensing based on Rayleigh frequency shift (DSS-RFS), provides insights about the characteristics of the near-wellbore-region (NWR) during production. The authors write that this novel FO technique can significantly improve understanding of near-wellbore hydraulic fracture characteristics and the relationships between stimulation and production from unconventional oil and gas wells.
Successful production profiling through distributed acoustics sensing (DAS) has been reported in gas-producing wells.