Unconventional/complex reservoirs

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.

Example of attributes and corresponding population distribution statistics
Fig. 1—Example of attributes and corresponding population distribution statistics extracted from DSS‑RFS strain-change profiles for the two primary types of completion designs tested in the HFTS2 well.

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.

Introduction

Successful production profiling through distributed acoustics sensing (DAS) has been reported in gas-producing wells.

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