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SWDS-LU (Logging tool)

A risk is associated with the loggingtool. Please refer to the tool description and specification for details.

Model id: Robertson Geologging Sidewall Density with BRD and temperature


  • high and/or very high (bed) resolution measurement of the rock density
  • bulk rock density/low resolution measuremnt of the rock density
  • borehole diameter, meassured with one sensor/arm
  • temperature
  • total natural gamma

Purpose: Long Spacing Density; High Resolution Density; Bed Resolution Density; Natural Gamma; Single Arm Caliper; Temperature

Description: The sidewall density gamma probe uses multiple detectors to provide an accurate borehole-compensated density measurement with high bed-boundary resolution. The probe contains a gamma source and two high-sensitivity scintillation gamma detectors. The detectors are protected against direct radiation from the source or via the borehole by extensive heavy-metal shielding. The active windows of source and detector are maintained firmly in contact with the borehole walls by a motorised back-up arm that also provides a borehole caliper measurement. Gamma radiation from the source is backscattered by the formation (Compton effect) and reaches the two detectors where the relative count-rates provide a measure of formation bulk density. The sonde is also equipped with a temperature sensor for recording of absolute temperature. The calliper arm has been extended. The sonde can operate in borehole 50 -350 mm. Logging speed between 4 and 6 m/min. 137Cs gamma source!

Characteristics: Long Spacing Density; High Resolution Density; Bed Resolution Density; Natural Gamma; Single Arm Caliper


Vertical resolution:0.010 m
Typical logging speed:4.00 m/min
Maximum pressure:20.0 MPa
Maximum temperature:70℃
Required boreholefluid:
no requirementsNo special requirements with regard to the borehole fluid.
Minimum borehole diameter:0.050 m
Maximum borehole diameter:0.350 m
Type of datatransfer:
cableData are transferred in real time via a cable.
Required type of logging cable:
4 conductorA logging cable with 4 conductors.
Required cablehead:
GO4Connector according to GO 4 standard (4 conductors).
Implement search on winches with this cable head.
Type of signal:
digitalDigital signal transmission.
Acquisitionsystem (recommended):RG-LU
Length:3.02 m
Maximum diameter:0.050 m
Weight:20 kg
Belongs to toolstring:
standaloneA stand alone tool that cannot be integrated in a tool string.
Usage conditons:Commercial usage allowed/welcome.
Additional usage conditions:Logging as service by Lund University
Additional specifications:137Cs gamma source!

Operator and contact:

Operator:Lund University, Engineering Geology
Contact person:Per-Gunnar Alm
Telephone:+46 462228992
Address: John Ericssons väg 1
223 63 Lund, Sweden

End of I-EDDA database record