دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a borehole;the hole drilled by the bit. A wellbore may have casing in it or it may be open (uncased);or part of it may be cased, and part of it may be open. Also called a borehole or hole.

in drilling, the drilled hole.