Borehole gravity surveying has occupied a small but important niche in the geophysical and gas & oil survey markets for more than 30 years. Density information obtained from borehole gravity measurements are both highly accurate and not affected by borehole conditions or casing which can render other density tools either useless or prone to significant error.
Borehole gravity surveying has entered a new era of reliability, efficiency, and capability.
With the introduction of the Gravilog™ gravity meter to the Mining and Geotechnical Industries, measurements can now be taken in holes as small as NQ drill rod (57.2mm) down to depths of 3000 meters and deviations off vertical to 60 degrees.
With the introduction of the new gravity sonde called Bluecap™ to the Oil and Gas industries, measurements can be taken down to a max temperature of 70C (158 F) and pressures of 25,500 kPA (3,700 PSI).
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Borehole gravity measurements have proven their worth in applications ranging from detecting bypassed oil and gas, salt dome mapping to reservoir monitoring and determination of bulk densities.