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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.The longer the distance between survey stations, the greater the possibility of error.
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In directional survey we note down the inclination and azimuth at the survey point for a particular survey depth and using these data we calculate the North-South (N-S), East-West (E-W) coordinates and TVD using few mathematical calculations.
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.
If survey intervals were 10 feet or less, the error would be acceptable.
Here, its worth mentioning that when the value of inclination (I) and azimuth (A) are same at both survey stations, then the denominator for some of the above equation becomes zero and hence the equation is not defined.