New geophysical memory-logging system for highly unstable and inclined scientific exploration drilling
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Published:2021-04-26
Issue:
Volume:29
Page:39-48
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ISSN:1816-3459
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Container-title:Scientific Drilling
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language:en
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Short-container-title:Sci. Dril.
Author:
Kück JochemORCID, Groh Marco, Töpfer Martin, Jurczyk Andreas, Harms Ulrich
Abstract
Abstract. We established a cable-free memory-logging system for drill-string-deployed geophysical borehole measurements. For more than 20 years,
various so-called “logging while tripping” (LWT) techniques have been available in
the logging service industry. However, this method has rarely been used in
scientific drilling, although it enables logging in deviated and unstable
boreholes, such as in lacustrine sediment drilling projects. LWT operations
have a far lower risk of damage or loss of downhole logging equipment compared with
the common wireline logging. For this
purpose, we developed, tested, and commissioned a modular memory-logging system that does not require drill string
modifications, such as special collars, and can be deployed in standard
wireline core drilling diameters (HQ, bit size of 96 mm, and PQ, bit size of 123 mm). The battery-powered, autonomous
sondes register the profiles of the natural GR (gamma radiation) spectrum, sonic
velocity, magnetic susceptibility, electric resistivity, temperature, and
borehole inclination in high quality while they are pulled out along with the drill
string. As a precise depth measurement carried out in the drill rig is
just as important as the actual petrophysical downhole measurements, we
developed depth-measuring devices providing a high accuracy of less than 0.1 m deviation from the wireline-determined depth. Moreover, the modular structure of
the system facilitates sonde deployment in online mode for wireline
measurements.
Publisher
Copernicus GmbH
Subject
Mechanical Engineering,Energy Engineering and Power Technology
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