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I searched Google for "horizontal drilling" and
this is what I came up with- a definition off of the Schlumberger
website:
A subset of the more general term "directional drilling," used where the
departure of the wellbore
from vertical exceeds about 80 degrees. Note that some horizontal wells are
designed such that after reaching true 90-degree horizontal, the wellbore
may actually start drilling upward. In such cases, the angle past 90 degrees is
continued, as in 95 degrees, rather than reporting it as deviation from
vertical, which would then be 85 degrees. Because a horizontal well typically
penetrates a greater length of the reservoir,
it can offer significant production
improvement over a vertical well.
Hope this helps.
Shelley Munson
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