Depth Referencing

Depth Referencing

This article describes the various depth references used for drilling onshore and offshore wells: Reference Datum, Chart Datum (CD), Mean Sea Level (MSL), High Tide (HT), Low Tide (LT), Water Level (WL), Lowest Astronomical Tide (LAT), Depth Subsea (SS)         

Reference Datum

For operations involving a rig, either onshore or offshore, all depths (either along hole or true vertical) are referred to the drill floor of the rig which initially drilled the well (original drill floor).

These depths below drill floor . . .

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