Title: Detection of vertical movement of fluids behind the casing of groundwater observation wells

Authors: Christian S. Koller; Bernd Hönow; Carsten Bellon; Frank D. Börner

Addresses: TDE Group GmbH, Langgasse 9, 8700 Leoben, Austria ' LogIn Bohrlochmessgeräte GmbH, Industriepark Straße B Nr. 2, 39245 Gommern, Germany ' Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205 Berlin, Germany ' Technical University of Berlin, Institute of Applied Geosciences, Chair of Applied Geophysics, Ernst-Reuter-Platz 1, 10587 Berlin, Germany

Abstract: Focus of this work is the detection of vertical movements behind the casing of groundwater observation wells within the seal. A new multi-methodical and azimuthal logging tool, named Azimuthal-Annulus-Convection-Identification (AACI)-Log has been developed and tested. The measurement concept of this probe is based on the combination of three azimuthal measuring logs - contact temperature on the inside of the casing wall, backscattered gamma-rays (gamma-gamma density), and natural radioactivity (gamma ray). Consequently, a direction-oriented image of the annular space can be derived. Not only the reason (void, potential channel) but also the resulting effect (vertical movement of fluids) can be detected with the Azimuthal-Annulus-Convection (AACI) - Log at the same time.

Keywords: vertical fluid movement; groundwater observation wells; azimuthal well logging; direction-oriented image; annular space; azimuthal temperature field; well casing.

DOI: 10.1504/IJHST.2016.079336

International Journal of Hydrology Science and Technology, 2016 Vol.6 No.4, pp.301 - 330

Received: 20 Dec 2014
Accepted: 19 Sep 2015
Published online: 27 Sep 2016 *

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