دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a break in the earths crust along which rocks on one side have been displaced (upward, downward, or laterally) relative to those on the other side.

n: Geological term denoting a formation break, upward or downward, in the subsurface strata. Faults can significantly affect the drilling fluid and casing programs due to possibilities for lost circulation, sloughing hole, or kicks.

where rock splits or ruptures with associated movement occurs on either side.

n: a condition wherein shale that has absorbed water from the drilling fluid expands, sloughs off, and falls downhole. A sloughing hole can jam the drill string and block circulation.