![]() Since the nearly inflexible drill pipe must be able to move and rotate through the entire depth, the angle of the borehole can be changed only a few degrees per tens of feet at any one time. This is done by drilling the well vertically to start and then angling it at a depth that depends on the relative position of the target. In such cases, the surface equipment must be offset and the well bore drilled at an angle that will intersect the underground formation at the desired place.
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