- Surface Location b) Tangent Section c) KOP
- Hold Angle e) Target Location
- 1.12 Buildup Rate (BUR)

The buildup rate is the change of inclination of a wellbore where the angle is increased. The rate is usually expressed in degrees per 100 ft or angular increase per 30 m of the measured depth.

5.1.13 Turn Rate

The turn rate determines the rate a well profile turns in azimuth direction. Usually expressed in degrees per 100 ft or degrees per 30 m.

True Vertical Depth (TVD)

The true vertical depth of any point or station along a wellbore is the vertical distance from the well surface reference point to the station of interest.

Measured Depth (MD)

The measured depth of any point or station along a wellbore is the distance from the well surface reference point to the station of interest along the actual well path.

The horizontal displacement is the distance between any two points along a wellbore projected onto a horizontal plane or plan view.

Vertical Section (VS)

The vertical section is the distance between any two points along a wellbore projection onto a vertical section plane.

Vertical Section (VS)

The vertical section is the distance between any two points along a wellbore projection onto a vertical section plane.

Azimuth

The azimuth is the angle in the horizontal plane measured from a fixed reference direction (such as True North), usually measured clockwise.

5.1.19 Quadrant

The quadrant bearing of a well is the angle in the horizontal plane measured from either a North or South reference direction towards the East or West, defining the direction of the wellbore.

5.1.20 Polar Coordinate

The polar coordinate of a point is the distance projected in a horizontal plane from a fixed reference point and the angle of this line from a reference direction (usually True North).

5.1.21 Rectangular Coordinate

The rectangular coordinates of a point are defined as the projected distance along two reference axes which are at right angles, the distance being measured from the intersection of the axes along the axes. These axes reside in the horizontal plane and typically are north/south and east/west directions.

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