Articles | Volume 29
Sci. Dril., 29, 39–48, 2021
https://doi.org/10.5194/sd-29-39-2021
Sci. Dril., 29, 39–48, 2021
https://doi.org/10.5194/sd-29-39-2021
Technical development
26 Apr 2021
Technical development | 26 Apr 2021

New geophysical memory-logging system for highly unstable and inclined scientific exploration drilling

Jochem Kück et al.

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Short summary
New cable-free borehole memory sondes allow measurements in boreholes with very unstable walls, which is common, e.g., in soft sediments below lakes. The drill-pipe-mounted memory sondes can pass through narrowed zones. While being pulled up by the drill pipes, they measure natural radioactivity, velocity of sound, electrical conductivity, magnetizability, and the temperature of the borehole rocks. We describe the memory sondes and appendant depth devices, both tested in thorough field tests.