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Petroleum Geology Acronyms


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HGNS Hole Deviation from Gravity (GDEV)

This is the name of a log measured along a well bore (a well-log). The acronym GDEV can be found in any (ASCII) log files provided by the logging company. The full name for this log used in the industry is 'HGNS Hole Deviation from Gravity'. This log is very common in the industry.

This log helps to evaluate the angle between the borehole axis and the vertical (also known as the Drift Angle and, in the drilling industry, Inclination).

Simply said, this is a log that describes the angular departure from some reference direction. When used with wells, it is the angle between the borehole axis and the vertical (also known as the Drift Angle).

This log usually has the unit 'Plane Angle'. This is the angular displacement between two lines extending from the same point, measured in the plane of the two lines.

Data from this log can be used to investigate the deviation of the borehole.



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