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Calculate the True Vertical Depth of Your Deviated Well or Borehole with Strater 3

Use Strater 3 to display your logs in True Vertical DepthWith Strater 3 you can calculate the True Vertical Depth (TVD), a mathematical approximation of the true X,Y,Z  path along a well, from your measured depth, azimuth, and inclination. Strater 3 comes equipped with 5 true vertical depth calculation methods, Tangential, Average Tangential, Balanced Tangential, Radius of Curvature, and Minimum Curvature, allowing you the freedom to choose the calculation that best fits your well's specific situation.

Display Your Log in True Vertical Depth

  1. To display a well log at True Vertical Depth in Strater 3, first click Log from the toolbar to select a log type. I will choose a Line/Symbol log.Use Strater 3 to display your logs in True Vertical Depth
  2. Click in the Borehole View to access the Open dialog and select and open a data file containing Hole ID, Depth, Inclination, Azimuth, and any other associated well data. You can download the same example data that I will use by clicking here. Use Strater 3 to display your logs in True Vertical DepthUse Strater 3 to display your logs in True Vertical Depth
  3. I will accept the defaults in the Specify Worksheet Column Definitions dialog by clicking Next, and then in the Specify Data Type and Column Positions dialog I will select the drop down menu next to Data and select Au (ppb) and then click Load. Use Strater 3 to display your logs in True Vertical DepthUse Strater 3 to display your logs in True Vertical Depth
  4. I will add a Depth log by clicking Log | Depth  from the toolbar, and then I will click next to my Line/Symbol log in the Borehole View to position the Depth log next to it.
  5. To display the Line/Symbol log in True Vertical Depth, I will click Borehole 1:DH-1 in the View Manager, and then in the Property Manager I will click the drop down menu next to Depth Method and click True Vertical Depth. Use Strater 3 to display your logs in True Vertical Depth

You have now displayed your Line/Symbol log in True Vertical Depth. You can also calculate the True Vertical Depth values from the Strater worksheet using the Create TVD  command.   Calculate True Vertical Depth Values

  1. To calculate the True Vertical Depth values in the Strater 3 worksheet, I will select the Sheet 1 tab.
  2. From the toolbar, I will click Data | Create TVD to open the Convert from Measured Depth to True Vertical Depth dialog. I will click the drop down menu next to True vertical depth calculation method to select  Minimum Curvature and then click OK. Use Strater 3 to display your logs in True Vertical DepthUse Strater 3 to display your logs in True Vertical Depth

You should now see a column labeled TVD with the True Vertical Depth values.  

 

Comments 2

Guest - Jordi Serret i Magaz on Tuesday, 08 July 2014 08:14

How can I specify the increment and ranges for the produced TVD? I mean, can I extrapolate the results to get an specific range on the TVD? And, can I choose the step increment inside of this range. Usually the range and step of the MD, inclination and azimuth data given by a client do not match with the requirement that we need to do our calculations so...here is my question!

How can I specify the increment and ranges for the produced TVD? I mean, can I extrapolate the results to get an specific range on the TVD? And, can I choose the step increment inside of this range. Usually the range and step of the MD, inclination and azimuth data given by a client do not match with the requirement that we need to do our calculations so...here is my question!
Jared King on Tuesday, 08 July 2014 09:13

Hi Jordi,

Thank you for your comment on this blog post. I am not entirely sure what you are wanting by extrapolating the results to get a specific range on the TVD. Are you saying that you want to change the range over which the TVD is calculated from the measured depth? Or are you wanting to extrapolate between your known data points to produce incremental TVD calculated values? If you would clarify what you are looking for, or provide an example of your calculations, I would be happy to help you further.

I have also included a reference to a good resource on these calculations from Crain's Petrophysical Handbook. Please see the link below.

Also, if you would like to follow-up with me on this discussion via email, I would be glad to elaborate on this further. You can email any further questions or examples to jared@goldensoftware.com

Best Regards,

Jared
Technical Support
Golden Software


True Vertical Depth Reference
For additional information on the methods for calculating TVD in Strater, refer to the following locations.
Crain's Petrophysical Handbook at http://www.spec2000.net/19-dip13.htm#b1
"Bulletin on Directional Drilling Survey Calculation Methods and Terminology," American Petroleum Institute (API) Bulletin D20, December 31, 1985.

Hi Jordi, Thank you for your comment on this blog post. I am not entirely sure what you are wanting by extrapolating the results to get a specific range on the TVD. Are you saying that you want to change the range over which the TVD is calculated from the measured depth? Or are you wanting to extrapolate between your known data points to produce incremental TVD calculated values? If you would clarify what you are looking for, or provide an example of your calculations, I would be happy to help you further. I have also included a reference to a good resource on these calculations from Crain's Petrophysical Handbook. Please see the link below. Also, if you would like to follow-up with me on this discussion via email, I would be glad to elaborate on this further. You can email any further questions or examples to jared@goldensoftware.com Best Regards, Jared [i]Technical Support Golden Software[/i] [b]True Vertical Depth Reference[/b] For additional information on the methods for calculating TVD in Strater, refer to the following locations. Crain's Petrophysical Handbook at [i]http://www.spec2000.net/19-dip13.htm#b1[/i] "Bulletin on Directional Drilling Survey Calculation Methods and Terminology," American Petroleum Institute (API) Bulletin D20, December 31, 1985.
Guest
Tuesday, 17 January 2017

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