Angle of Deviation

Definition - What does Angle of Deviation mean?

Angle of deviation or commonly known as angular deviation is the angle from the surface of oil wellbore from the vertical. A deviation survey, or simply referred to as survey is conducted to measure this angle in degrees. Technical hole deviation, which is usually used when an oil well is vertical, helps in planning the well path drilling. The angle deviation can be different according to the characteristics of the wellbore and it can be defined and described using the technical hole deviation which is different from hole deviation.

Petropedia explains Angle of Deviation

Whenever an oil well is to be drilled, a well plan is designed by conducting deviation survey that determines the measurement of the angle of the oil wellbore on the surface from the vertical. Since every well is different, it bears different characteristics that can infer with the normal drilling. Therefore, an angle of deviation is necessary to be determined by carrying out the deviation survey. Whether a well has vertical or perpendicular borehole path, the angle of deviation can help in using right tools to dig a hole safely.

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