In which case we need to do directional drilling?

1. Drilled to one surface location to another sub-surface location.

2. For the relief well.

A directionally drilled well 

is defined as a well bore that 

intersects a potentially productive 

formation and does not 

intentionally exit the formation for 

the remaining footage drilled. 

Generally, this means that the well 

is spudded like a conventional 

vertical well, and at a 

predetermined "kick-off" point 

(KOP), the well is deviated from 

the vertical so that the well bore 

enters the formation roughly 

parallel to the bedding plane. In 

addition to directionally drilled 

wells from the surface, some mine 

operators drill directional wells 

from within the mine working for 

degasification and geological 

control. Currently .