International Ocean Discovery Program

Logging

The European Petrophysics Consortium (EPC), under the ECORD Science Operator (ESO), provides scientific drilling projects with a wide range of slimline downhole logging tools. A suite of eight single-run tools was recently expanded by a comprehensive selection of stackable, slimline logging tools. All our slimline downhole logging tools are of small diameter (typically max. 5 cm), comparatively lightweight and easy to handle.

The Slimline Suite

The new suite of slimline, stackable tools allows customizing the tool stacks for specific applications, therefore improving downhole logging data quality since multi-parameter measurements are gathered in a single run, in turn leading to reduced logging time. Each tool is equipped with its own telemetry board, power supply element and A/D converter, so they can also be operated as stand-alone probes if necessary.

The following logging tools are available to scientists at Leicester (subject to availability), but are provided by the University of Montpellier (Laboratoire de Géosciences-Montpellier, France), as part of the EPC under ESO. Learn more about the tools.

Natural gamma tools

Resistivity tools

Magnetic susceptibility tools

Borehole imaging tools

Sonic tools

Mechanical tools

Fluid property tools

Summary table and stackability

Up to three tool probes can be stacked on the same tool string saving up to 25% of the logging time. However, not all tools are stackable and many of them require to be at the end of a tool string to be effective (e.g. Spinner Flowmeter). Stackable tools are separated from standalone tools in the below table.

Name  Instrument type  Description  Stackable tool  Single-run tool 
QL40 OBI  Imaging tool  Optical televiewer  Yes  Yes 
QL40 ABI  Imaging tool  Acoustic televiewer  Yes  Yes 
QL40 GAM  Gamma tool  Total count natural gamma  Yes  Yes
QL40 Ocean  Fluid properties tool  Water quality probe  Yes  Yes 
QL40 SFM  Fluid properties tool  Spinner flowmeter  Yes  No 
QL40 FTC  Fluid properties tool  Fluid temperature and conductivity probe   Yes  No 
DIL45  Resistivity tool   Induction conductivity probe  No  Yes 
DLL  Resistivity tool  Dual spaced focused resistivity  No   Yes

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