Analysing survey data in DeviCloud

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Navigating to survey results

There are a number of ways to find survey results in DeviCloud:

  • Through the home page dashboard (accessible by clicking the DeviCloud logo), where you can find latest surveys/rig alignment shots, and all sites and projects
    devicloud home
  • Through the search bar at the top of DeviCloud
  • By navigating through site/project/drill program dashboards

Note: It is recommended that surveys are viewed on a 'hole' level, which enables users to select, view and average multiple continuous surveys at once.

  • To view a drill hole dashboard, select the hole name
select hole
  • Once in the hole dashboard, scroll down to find the survey results section

 

Reviewing survey results

  • Once in survey results, make a selection of surveys to review (check tick boxes). Note that all can be selected but if there are many surveys available, they may become difficult to load. In this case, it is recommended that the last three in/out PASS runs (six runs total) are selected.

 

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  • You will then be able to review 2D and 3D plots, create a QA report and export data (csv, str)

 

Once surveys are selected, 2D graphs will automatically update in DeviCloud (azimuth graph will display as a default).

To change graph view:

  • Click on the Y axis drop-down, followed by the desired graph view. Graph will then update.

DeviCloud azimuth plot

To view the QA report in DeviCloud:

  • Click view QA report and Graphs. Alternatively, select Download QA report, to download directly as an Excel file.

 

Reviewing the QA report:

Within the QA report, users can review all information related to drill hole, collar, surveys and movement periods.

To assess survey quality, the most important value is the standard deviation (misclose). DeviCloud sets the maximum allowed standard deviation of the estimated end of hole position at 5m per 1000m survey depth.

If within this value, the survey will be a green PASS. If not, the survey will flag a red FAIL.

To download QA report, select the option from the drill hole dashboard, within the QA report, or in the Table section of the QA report. This will download as an Excel file and include the QA report, and data from all survey runs including the average run.

To export CSV or STR formats, navigate to the Table section in the QA report:

  • Select Export, followed by the relevant format

 

Weighted averaging

The weighted averaging feature in DeviCloud improves the accuracy of multiple survey runs by providing an average dataset, removing the need to select an in or out run. It's always recommended this feature is used when analysing and exporting survey data.

 

To visualise averaged data:

  • Select the number of runs you would like to average by checking their tick box
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  • Navigate to the 2D graphs and tick the box ' Include average ± 1 std.dev.'
  • The weighted average run will then appear in black
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To view averaged QA report and survey data:

  • Select the number of runs you would like to average by checking their tick box
  • Click 'View QA Reports & Graphs'


You can now view QA cover sheet, graphs and data points (table) for all combined surveys

To view the average survey run in 'Table', select Table and then choose the average run at the bottom of the 'select the survey to view' dropdown. Data can then be exported to the desired format by clicking the Export button.
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Oscillation Filter (for failed surveys)


 

The oscillation filter in DeviCloud is a graphical smoothing function that can be applied to the azimuth and inclination to help:

  • Remove the spikes that can be associated with tool rotation, especially during pump-in surveys
  • Interpret data where a ‘step’ in Azimuth has occurred in the in or out run. This would most commonly occur at the start of a hole, where a drill pipe may have a slight bend at the collar.

Note: Downhole Surveys recommends that in the instance of a failed survey, DeviGyro operators apply the oscillation filter to check if the survey data can be interpreted as good and ultimately considered a PASS. Doing so however won’t always result in a passed survey and operators should complete other troubleshooting recommendations (review wireline/water control, tool maintenance check, calibration check etc) in the case of continually failing surveys.

Azimuth plot: No oscillation filter

Azimuth plot: Oscillation filter applied

Inclination plot: No oscillation filter

Inclination plot: Oscillation filter applied

 

The filter can be applied in the DeviGyro App following a survey:


  • Select Config when viewing survey results, then select Tool Config
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  • Turn Oscillation Filter on
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  • Check if QA results PASS. Survey should be recompleted if still failing.

To apply the filter in DeviCloud:

  • Select the In and Out run to be recalculated, then select Manage Selected Surveys

  • Select the Oscillation Filter tick box and click recalculate surveys
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Re-processing surveys with different azimuth

Surveys can be re-processed with a different azimuth if required.

 

To reprocess surveys with new azimuth:

  • Select the number of runs you would like to re-process by checking their tick box
  • Click 'Manage Selected Surveys'
  • Click 'Set Starting Azimuth'
  • A table with rig alignment/collar reference shots will appear. Select the shot you wish to use, or you can select 'Use Design Azi'
  • Selected surveys will now re-process with the new azimuth

 

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