Input Definition

On the Input Definition form, you specify the data mode and caliper type, and you select the data that is used for the analysis. Caliper data is available as log files, which can be imported using the data strip. To perform a caliper analysis, the following data is required:

  • A case with the wellbore for which you want to perform caliper analysis assigned to it
  • Depth data
  • Caliper data
  • Bit size (as a log or as a constant)

and one out of the following two data types (see Using caliper logs to interpret breakouts for more details about the calculations):

  • Relative Bearing
  • Pad 1 Azimuth
Important  The caliper analysis is performed on the well that is linked to the 1D Active Case.

Specifying the input data

The selections you make in the first two fields enable the correct amount of radius log or Caliper (chord) options lower on the form.

Data mode  Depending on the type of data that you have, select either Caliper or Radius.

Caliper type  Select the option for which you have data, either 4 arms or 6 arms caliper.

The next two options are mutually exclusive. When you use the radio button for one input entry, the other option is disabled.

The algorithm uses two equations to convert one data to the other. For example, when selecting Relative Bearing, the algorithm will use an equation to convert from Relative Bearing to P1Azi. It is recommended that, if you have the P1azi log available, you compare it with the calculated results.

Relative Bearing  Select this option when working with a deviated well, when the deviation of the wellbore is greater than 15 degrees.

Pad 1 Azimuth  Select this option when working with a vertical well.

Radius/Caliper (Chord)  Depending on the type of data you have, the number of logs that you can select varies between 2 and 6. Usually, the logs that you have imported have names that indicate which log belongs where. The drop-down list is filtered, only logs of the type 'caliper' are listed.

Bit size  Specify bit size data using the drop-down list or check the use constant option to define a constant bit size to use during the calculation.

For easier data interpretation, you can also use available well marker data and well schematic information, but you do not specify that on this form.

Click OK to save the input settings, close the form and move to the next form to run the Caliper Analysis.