5.2 Log Data Object

The WITSML Log data object is used to capture and transmit the data collected from a variety of logs. It is use to capture and transfer data for:

• MWD parameters such as pressure, temperature, and survey stations
• Surface or drilling parameters like ROP, RPM, WOB, etc.

• LWD parameters such as gamma rays, sonic, resistivity, etc.

The Log object is considered a growing object because as measurements are taken (over time or increased depth) that data is added to the Log.

However, in WITSML, a log object is constrained to capture curves from a single pass. This object is uniquely identified within the context of one wellbore object.

The Log WITSML object containing multiple logging parameters as channels can be transmitted in real-time and can be indexed to either Time or Depth. This object is declared as growing object. This will grow slowly with time as the wellbore is drilled.