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Solid Earth An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/se-2020-61
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-61
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  11 May 2020

11 May 2020

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This preprint is currently under review for the journal SE.

In situ hydromechanical responses during well drilling recorded by distributed fiber-optic strain sensing

Yi Zhang1,2, Xinglin Lei3, Tsutomu Hashimoto1,2, and Ziqiu Xue1,2 Yi Zhang et al.
  • 1Geological Carbon Dioxide Storage Technology Research Association, Kyoto, 6190292, Japan
  • 2Research Institute of Innovative Technology for the Earth (RITE), Kyoto, 619-0292, Japan
  • 3Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8567, Japan

Abstract. Drilling fluid infiltration during well drilling induces pore pressure and strain perturbations in neighboured reservoir formations. In this study, we in situ monitored such small strain changes (~ 20 µε) using fiber-optic distributed strain sensing in two observation wells with different distances (approximately 3 m and 9 m) from a new drilling wellbore in a shallow water aquifer. The results suggest that the drilling induced hydromechanical deformations that occurred at depths of both wells are indicative of the impact zones of fluid invasion and reservoir permeability structure (heterogeneity). A hydraulic diffusion model is used to interpret the strain evolution. The method and data would be useful for understanding reservoir pressure communications, determining the zones for fluid productions or injections (e.g., for CO2 storage), and optimizing reservoir management and utilization.

Yi Zhang et al.

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In situ hydromechanical responses during well drilling recorded by distributed fiber-optic strain sensing (Dataset) Y. Zhang, X. Lei, T. Hashimoto, and Z. Xue https://doi.org/10.6084/m9.figshare.12009504

Yi Zhang et al.

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Latest update: 23 Oct 2020
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Short summary
(1) The drilling fluid infiltration during well drilling induced pore pressure and strain perturbations in the reservoir formation. (2) Spatially distributed strain responses from two monitoring wells acquired using fiber-optic distributed strain sensing (DSS). (3) Strain polarities and magnitudes along the wellbores may be indicative of the layered-permeability structure. The performance and value of DSS, as a novel hydrogeophysical tool, in subsurface monitoring are emphasized.
(1) The drilling fluid infiltration during well drilling induced pore pressure and strain...
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