## Determining True Vertical Depth

The following is a simple method of correcting for the TVD on directional wells. This calculation will give the approximate TVD interval corresponding to the measured interval and is generally accurate enough for any pressure calculations. At the next survey, the TVD should be corrected to correspond to the directional Driller's calculated true vertical depth:

where TVD2 = new true vertical depth, ft TVD1 = last true vertical depth, ft CL = course length — number of feet since last survey cos = cosine

Example: TVD (last survey) = 8500 ft Deviation angle = 40 degrees Course length = 30 ft

Solution: TVD2 = cos 40 x 30 ft + 8500 ft TVD2 = 0.766 x 30 ft + 8500 ft TVD2 = 22.98 ft + 8500 ft TVD2 = 8522.98 ft

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### Responses

• violanda
What is needed for true vertical depth calculation?
9 years ago
• benjamin ziegler
How do you calculate deviation with measured depth and true vertical depth?
4 years ago
• Eyob
How to find true vertical depth in drilling?
3 years ago
• bungo
How to solve problems on true vertical depth of a well?
2 years ago
• Bandobras Brownlock
How tvd is calculated from MD and inclination?
9 months ago
• Dirk
Do you use true vertical depth or depth for valuing a well in ar?
6 months ago
• WILL
How to find TVD from MD and inclination?
6 months ago
• Belinda Rossi
How to calculate md using tvd and inclination?
6 months ago