Pulse Testing for Monitoring the Thermal Front in Aquifer Thermal Energy Storage

Fokker, P.A.; Borello, Eloisa Salina; Viberti, Dario; Verga, Francesca; Wees, Jan-Diederik van

doi:10.1016/j.geothermics.2020.101942

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…These studies are a list of some methods and methods for testing systems and structures. These include testing, an expensive and time-consuming stage in the development of software systems [2], spectral analysis of diagnostic signals [3], ultrasonic sensing [4], pulse testing [5], integration of advanced CAE tools and test environments [6], modelbased testing [7], micro-level computer processing [8], patterns for natural language translation in SQL queries [9]. Especially it should be noted the most common method of shock testing in all its diversity [10].…”

Section: Related Workmentioning

confidence: 99%

Computer simulation of strength testing of an object based on signal shaped resources

Zelmanov¹,

Krylov²

2023

IJITS JOURNAL

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Considered the problem of the effectiveness of the proposed and protected method for testing systems and structures, based on the use of the impulse response of the test object as an optimal test signal. The purpose of the study is to confirm the gain in the magnitude of the response of the test object to the optimal signal compared to traditional methods. To solve the considered problem, an approach based on the representation of the test object in the form of a matched filter is proposed. As a result of computer simulation of the procedure for the impact of various test signals on the test object, it was possible to show the advantage of the optimal test signal in the form of the maximum response of the test object to it.

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Section: Related Workmentioning

confidence: 99%

Computer simulation of strength testing of an object based on signal shaped resources

Zelmanov¹,

Krylov²

2023

IJITS JOURNAL

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“…In contrast to constant‐rate pumping tests, oscillatory hydraulic tests can be designed in a mass‐conservative manner such that there is no net water extraction or injection into tested fractures, thereby minimizing alterations to the ambient stress and flow fields along the fracture (Cardiff & Barrash, 2015; Rabinovich et al., 2015). In applications that require continuous pumping (e.g., geothermal production), a periodic pressure signal can be superimposed at the pumping well by systematically varying flow rates above and below a long‐term pumping rate, allowing reservoir characterization to occur without interrupting production operations and minimizing revenue losses (Fischer et al., 2018; Fokker et al., 2021; Salina Borello et al., 2019). Finally, because the frequency of the input signal is known, recorded observation signals are readily extracted from instrument noise, instrument drift, and/or hydrologic noise (e.g., evapotranspiration and recharge events) using standard linear signal processing techniques (Bakhos et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Stiff, Smooth, and Solid? Complex Fracture Hydraulics' Imprint on Oscillatory Hydraulic Testing

Patterson,

Cardiff

2023

Water Resources Research

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Fractured bedrock aquifers, especially deep aquifers, represent increasingly common targets for waste storage and alternative energy development, necessitating detailed quantitative descriptions of fracture hydraulic properties, geometry, and connectivity. Yet, multi‐scale characterization of the physical properties that govern fluid flow through and storage in fractured bedrock remains a fundamental hydrogeologic challenge. Oscillatory hydraulic testing, a novel hydraulic characterization technique, has been showing promise in field experiments to characterize the effective hydraulic properties of bedrock fractures. To date, these characterization efforts utilize simplified diffusive analytical models that conceptualize a non‐deforming, parallel‐plate fracture embedded within impermeable host rock, and have found that the returned fracture hydraulic parameter estimates exhibit an apparent period‐dependence. We conduct synthetic experiments using three different numerical models to examine proposed mechanisms that might contribute to the observed period‐dependence including heterogeneous flow and storage within the fracture (i.e., aperture heterogeneity), fracture‐host rock fluid exchange, and fracture hydromechanics. This work represents the first systematic analysis that seeks to understand the process(es) occurring within a bedrock fracture that might be contributing to this apparent period‐dependence. Our analysis demonstrates that all investigated mechanisms generate period‐dependent effective hydraulic parameter estimates, each with their own potentially diagnostic trends; however, fracture hydromechanics is the only explored mechanism that consistently reproduces period‐dependent trends in parameter estimates that are consistent with existing field investigations. These results highlight the need to develop more complex numerical modeling approaches that account for this hydromechanical behavior when characterizing fractured bedrock aquifers.

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“…Harmonic pulse tests are being developed and used but assume the spreading away from the injection well is cylindrical (or spherical if the layer is thick compared with the injection area). Another but different and shallow application is seasonal storage and production of heat in shallow aquifers (Fokker et al, 2021). Such changes translate themselves in electric resistivity changes, but such changes can be small.…”

Section: Introductionmentioning

confidence: 99%

Examples of Seismic Shallow Subsurface Characterisation and Deep Electromagnetic Monitoring

Slob¹,

Draganov²,

Eltayieb³

et al. 2021

NSG2021 27th European Meeting of Environmental and Engineering Geophysics

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Difficulties in detecting and characterising shallow objects close the surface with seismic shear waves are often problematic because of dominant surface waves. By sequencing a specific combination of two data driven processing steps followed by diffraction tomography can overcome these problems. Small scattering objects become visible in the final image that can have importance of the understanding of subsurface locations, such as areas of archaeological interest. On the other hand, deep changes in the electric resistivity on land are often problematic to detect and especially to monitor time-lapse change over long periods of time. The usual electrodes slowly erode and vanish. Geothermal heat production environments often lead to changes in the resistivity between in-situ water-filled formations and cooler injected water-filled formations of less than one order of magnitude. A dedicated set of capacitively coupled electrode could overcome to erosion problem. When placed in a well with composite casing, these could be used in measurements of much enhanced detectability. In that case it is necessary to have electrodes in a zone from below to above the target layer. By changing the source offset at the surface, optimal measurements can be done to detect the small and deep changes in resistivity.

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Pulse Testing for Monitoring the Thermal Front in Aquifer Thermal Energy Storage

Cited by 4 publications

References 31 publications

Computer simulation of strength testing of an object based on signal shaped resources

Computer simulation of strength testing of an object based on signal shaped resources

Stiff, Smooth, and Solid? Complex Fracture Hydraulics' Imprint on Oscillatory Hydraulic Testing

Examples of Seismic Shallow Subsurface Characterisation and Deep Electromagnetic Monitoring

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