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With the tangential method, the greater the build or drop rate, the greater the error.

Also, the distance between surveys has an effect on the quantity of the error.

"With my study and practice works performed on live well data, I observed that the calculations based on Tangential Method gives a considerably large value of departure and in some cases the well appears to be too shallow.

In some deviated wells, the error in TVD was more than 40-50 feet."This technique provides a smoother curve which should more closely approximate the actual wellbore between surveys.

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The longer the distance between survey stations, the greater the possibility of error.

When using the average angle method, the inclination and azimuth at the lower and upper survey stations are mathematically averaged, and then the wellbore course is assumed to be tangential to the average inclination and azimuth.

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