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

Zhang, Yi; Lei, Xinglin; Hashimoto, Tsutomu; Xue, Ziqiu

doi:10.5194/se-11-2487-2020

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…Interpretation of strain data during well testing become increasingly important as in‐situ strain measurement becomes more accessible (Cappa et al., 2006; Hua et al., 2017, 2020; Murdoch et al., 2020; Schuite et al., 2017; Sun et al., 2020; Zhang et al., 2020). We envision that simple methods, like the ones described here, could provide initial estimates for more comprehensive analyses of strain data (Barbour & Wyatt, 2014; Murdoch et al., 2019; Schuite et al., 2015, 2017; Vasco et al., 2001).…”

Section: Discussionmentioning

confidence: 99%

A Type‐Curve Approach for Evaluating Aquifer Properties by Interpreting Shallow Strain Measured During Well Tests

Murdoch

Germanovich

Roudini

et al. 2021

Water Resources Research

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Strains occur at shallow depths in response to pressure changes during well tests in an underlying aquifer, and recent developments in instrumentation have made it feasible to measure essentially the full strain tensor. Simulations using poroelastic analyses indicate that shallow normal strains are approximately proportional to the logarithm of time when a well is injecting into or pumping from a deep aquifer or reservoir. The drawdown is also a linear function of log time, as shown by the classic Cooper‐Jacob type‐curve analysis. The time when the semilog straight line intercepts the zero‐strain axis is similar to the time determined from the Cooper‐Jacob pressure analysis, and it can be used to estimate hydraulic diffusivity, suggesting that horizontal strain data can be used directly to estimate aquifer properties. This approach was validated using measurements from shallow (30‐m deep) borehole strainmeters during an injection test at a 530‐m‐deep sandstone aquifer/reservoir in Oklahoma. The results show intercept times for the shallow normal strain data are essentially the same as for deep pressure data from an equivalent radial distance. The slopes of the semilog plots of the pressure and the strain increase at the same time, suggesting that they both respond to a lateral aquifer boundary. Significantly, though, strain was measured at shallow depths while the pressure data were measured at 530‐m depth. This suggests that strain data from shallow depths could be an effective way to improve the characterization of an underlying aquifer.

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Section: Discussionmentioning

confidence: 99%

A Type‐Curve Approach for Evaluating Aquifer Properties by Interpreting Shallow Strain Measured During Well Tests

Murdoch

Germanovich

Roudini

et al. 2021

Water Resources Research

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“…The high sensitivity and spatial resolution of the TW-COTDR technique are key to its success in various other applications, including well drilling [10], landslide monitoring [11], or water migration in rocks [12]. The only weaknesses of TW-COTDR are that it is relatively slow and that the non-uniform distribution of strain and/or temperature within the spatial resolution leads to low correlation values and, therefore, difficulties in determining the shift value.…”

Section: Principle and Performance Of Distributed Rip Methods And Com...mentioning

confidence: 99%

Distributed Optical Fiber Sensors for Monitoring of Civil Engineering Structures

Kishida¹,

Imai

Kawabata

et al. 2022

Sensors

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Distributed Fiber Optics Sensing (DFOS) is a mature technology, with known, tested, verified, and even certified performance of various interrogators and measurement methods, which include Distributed Temperature Sensing (DTS), Distributed Temperature-Strain Sensing (DTSS), and Distributed Acoustic Sensing (DAS). This paper reviews recent progress in two critical areas of DFOS implementation in large scale civil engineering structures. First is the substantial improvement in sensing accuracy achieved by replacing Brillouin scattering-based measurements with its Rayleigh counterpart. The second is progress in acquisition speed and robustness, as now engineers can observe parameters of interest in real-time, and make informed, operational decisions regarding quality and safety. This received a high valuation from field engineers when used during the construction stage of the project. Furthermore, this change in the use of DFOS in civil engineering greatly increases the practical possibility of installing FO cables permanently. The same FO cables can be later used for long-term monitoring, during maintenance periods throughout the structure’s lifetime. To illustrate these two advances, we present a comparison between Brillouin and Rayleigh scattering measurements, and their accuracy, and highlight the importance of temperature and strain separation. We also present several important applications in large scale civil engineering infrastructure projects.

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Fiber Optic Technology for Environmental Monitoring: State of the Art and Application in the Observatory of Transfers in the Vadose Zone-(O-ZNS)

Abbar

Isch

Michel

et al. 2022

Instrumentation and Measurement Technologies for Water Cycle Management

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

Cited by 4 publications

References 56 publications

A Type‐Curve Approach for Evaluating Aquifer Properties by Interpreting Shallow Strain Measured During Well Tests

A Type‐Curve Approach for Evaluating Aquifer Properties by Interpreting Shallow Strain Measured During Well Tests

Distributed Optical Fiber Sensors for Monitoring of Civil Engineering Structures

Fiber Optic Technology for Environmental Monitoring: State of the Art and Application in the Observatory of Transfers in the Vadose Zone-(O-ZNS)

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