Offshore Well Datum Examples

Datums

This topic illustrates the following 6 cases where Datums are created in OpenWells® software for Offshore Wells (Fixed and Mobile Platforms):

Example 4 (Offshore Well)

Example 5 (Offshore Well)

Example 6 (Subsea Well)

Example 7 (Subsea Well)

Example 8 (Subsea Well)

For a list of examples of Land Wells see the Land topic.

Example 4 (Offshore Well)

The following example is an Offshore Platform where:

• the System Datum is Mean Sea Level (MSL)

• the Reference Datum Level (RDL) is Rotary Kelly Bushing (RKB)

Example 5 (Offshore Well)

The following example is an Offshore Platform or Jackup where:

• the System Datum is Lowest Astronomical Tide (LAT), which is 1.5m above Mean Sea Level (MSL) and

• the Reference Datum Level (RDL) is Rotary Kelly Bushing (RKB)

Example 6 (Subsea Well)

The following example is an Subsea Well where:

• the System Datum is Mean Sea Level (MSL)

• the Reference Datum Level (RDL) is Rotary Kelly Bushing (RKB)

Example 7 (Subsea Well)

The following example is an Subsea Well where:

• the System Datum is Lowest Astronomical Tide, which is 1.5m below Mean Sea Level (MSL) and  

• the Reference Datum Level (RDL) is Rotary Kelly Bushing (RKB)

Example 8 (Subsea Well)

The following example is an Subsea Well where:

• the System Datum is Mean Sea Level (MSL) and  

• the Reference Datum Level (RDL) is Mudline