دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: deviation of the borehole at least 80. from vertical so that the borehole penetrates a productive formation in a manner parallel to the formation. A single horizontal hole can effectively drain a reservoir and eliminate the need for several vertical boreholes.

n: drilling when the departure of the wellbore from vertical exceeds about 80 degrees. Beause a horizontal well typically penetrates a greater length of the reservoir, it can offer significant improvement over a vertical well.

a well drilled in a manner to reach an angle of 90 degrees relative to a level plane at its departure point at the surface. In practice, the horizontal section of most horizontal wells vary several degrees.