Utilizing a Density down hole logging instrument combined with a cobalt radioactive source, Sonic Surveys can accurately locate the product/ brine interface essential for product volumes in the storage cavern industry.

The Temperature Instrument is manufactured for detecting protection fluid interfaces in salt caverns and simultaneously performing a high precision temperature measurement and the measurements of natural Gamma Rays and in boreholes. A casing detection system is included, which can distinguish between inner and outer collars in the case of double casing. Due to the digital data transmission system, the data values are not influenced by any transmission line characteristics.

The Gamma Ray log measures naturally emitted gamma ray radiation to determine formation evaluation. In storage caverns, gamma ray logs are used to determine the top of the salt or roof of the cavern. It is also used to help locate washouts behind pipe.

The Pulsed Neutron log detects the water-hydrocarbon interface, i.e. the brine/diesel interface. It is also used to locate the interface below multiple strings of pipe. Another feature of the pulsed neutron is that no radiation is omitted unless the tool power is on. It is only enabled down hole. It is never enabled above ground.

The X-Y Caliper uses two separate caliper axis to determine borehole diameter. Cemeting volumes can be achieved by averaging each of the caliper axis recorded.

The Temperature Pressure log records constant temp/pressure. Primarily it is used for determining gas volumes in natural gas storage caverns.

The Sonic Surveys Digital DSCL measures collars of two concentric casing strings separately. Unique to Sonic Surveys this high tech. CCL used the electric magnetic principle to achieve excellent results. Under favorable conditions the casing shoe of a third string of casing can also be detected.