Interface Detection in Salt Caverns

Gamma-Density Interface Tool (GDI-2) *Patent Pending

BGES’ proprietary GDI-2 is a multi-receiver density measurement tool capable of detecting fluid interfaces behind 1 or 2 sets of casings. It is specifically designed to detect various types of gas-liquid and liquid-liquid interface in salt caverns.  The tool has a vertical resolution of up to 2” (or 5cm), and is approved by the CNSC with no well abandonment requirements if it becomes unrecoverable in a well / cavern.


This log can be run as a standalone service or as part of a cavern Mechanical Integrity Test (MIT) to detect gas-liquid interfaces such as nitrogen/brine, butane/brine, as well as liquid-liquid interfaces such as diesel/brine and condensate/brine, etc.

Features and Benefits

Cost advantage – because the operating cost for this tool is low compared to a Pulse Neutron tool, BGES is able to transfer the savings to our clients to reduce their overall costs especially on multi-day projects.

Low financial risks – the replacement cost of the GDI is approx. 25% of that of a typical Pulse Neutron tool. If in a rare case the tool is lost in hole, the cost would be significantly lower.

Low environmental risks – since this tool uses a gamma source with a very short half-life, there is no abandonment required by the CNSC if this tool is irretrievable in a cavern or well.


This tool allows continuous reading of the interface and does not energize the formation. Real-time downhole pressure & temperature measurements can eliminate assumptions and approximations, which is greatly beneficial for MITs.
There is no abandonment requirement if tool is lost in hole.

BGES GDI-2 Info Sheet

Click to download PDF.