Directional well
![Depiction of a directional well.Line (a) is an imaginary line representing the True vertical depth, while line (b) is the borehole itself, and its length is called the measured depth](/Images/godic/202501/09/True_vertical_depth5511.jpg")
A directional well is an oil industry term for an oil well with a borehole that deviates from a vertically straight line. This is normally an intentional decision and done purposefully, to hit several target sands, for instance.
Directional well
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