Distributed Fiber Optic Sensing System for Well‐Based Monitoring Water Injection Tests—A Geomechanical Responses Perspective
2020
Sun, Yankun | Xue, Ziqiu | Hashimoto, Tsutomu | Lei, Xinglin | Zhang, Yi
In this study, distributed fiber optic sensing (DFOS) based on hybrid Brillouin‐Rayleigh backscattering is examined for the first time in well‐based monitoring distributed profiles of geomechanical deformation induced by water injection. Field water injection tests are conducted under different injection scenarios between an injection well (230 m, IW #2) and 5.5 m away from a fibered monitoring well (300 m, MW #1) by deploying cables behind the casing at Mobara, Japan. Effects of injection rate, pressure, and lithological heterogeneity on the geomechanical deformation are quantitatively monitored via a DFOS approach and indicate that induced strains significantly depend on injection rate and pressure. The results also indicate that DFOS results are reasonably consistent with simultaneous geophysical well logging data and corresponding numerical simulation. The extent of impacted areas and magnitude of near‐wellbore strains are explored to evaluate formation heterogeneity and fluid migration behaviors. The field testing of hybrid DFOS technology is expected to definitely advance elaborate monitoring and wider applications, such as CO₂ geosequestration sites.
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