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The rectangular coordinates can be used to calculate the departure horizontal displacement between the surface location and the bottom hole target as follows departure e w . Geographic north points to the north pole this direction is indicated by the polar star. Rectangular coordinates rectangular coordinates of a target are usually given in feet meters north south and east west of the local reference point. the point at which the building ends and we either hold or drop the wellbore path . However the final calculated coordinates are always converted to either true north or grid north.

Magnetic declination magnetic north and true north do not coincide. They can be easily derived by subtracting the grid coordinates of the surface location from those of the target. Magnetic azimuths are not constant due to the movement of the north and south magnetic poles and hence magnetic measurements may be in error due to local magnetic field variations. Tangent or hold section the portion of hole in which the inclination and azimuth is maintained the same throughout the section. Build section that portion of the hole in which the inclination angle is increased rate of buildup is usually expressed as the angular increase per 100 feet of measured depth.

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Grid north grid north is an arbitrary direction and is always in the direction of the positive ordinate axis of the specific grid used for a particular survey. The rectangular coordinates can be used to calculate the departure horizontal displacement between the surface location and the bottom hole target as follows departure e w there are three azimuth reference systems true geographic north grid north and magnetic north. Drop off it is the act of reducing the inclination of the drilled hole wrt vertical.
Build up it is the act of increasing the inclination of the drilled hole wrt vertical. The angle in degrees between true and magnetic north is called the declination angle.


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