# Tangential Method Calculation

The tangential method is the simplest calculation among other directional survey calculations. The tangential method formulas are listed below; Tangential Method Calculation formula

Where;

MD = Measured Depth between surveys in ft

I1 = Inclination (angle) of upper survey in degrees

I2 = Inclination (angle) of lower in degrees

Az1= Azimuth direction of upper survey

Az2 = Azimuth direction of lower survey

The following example is the Tangential Method Calculation.

Survey 1

Depth = 3500 ft

Inclination = 15 degree (I1)

Azimuth = 20 degree (Az1)

Survey 2

Depth = 3600 ft

Inclination = 25 degree (I2)

Azimuth = 45 degree (Az2)

Solution:

MD = 3600 – 3500 = 100 ft As per the formulas above, you will get answers as listed below;

North = 29.88 ft

East = 29.88 ft

TVD = 90.63 ft

Please find the Excel sheet used for The Tangential Method Calculation

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### 4 Responses to Tangential Method Calculation

1. chinonso says:

i acknowlegde this site for their work well done.

2. Steve Hopkins says:

There are several methods that can be used to calculate the survey data, of these some are accurate while are other may produce some error for a given situation.
Some of the most common methods used for survey calculation in the industry are:
Tangential method (Least Accurate)
Balanced Tangential method
Average Angle method
Radius of Curvature method (Most Accurate)
Minimum Curvature method (Most Accurate)

You’ve done a fine job, I thank you for sharing your knowledge.

3. manmohan says:

• DrillingFormulas.Com says: