دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a slotted opening or a full section removed in the pipe lining (casing) of a well, usually made to permit sidetracking. 2. a period during which an operation or action can be carried out, such as the drilling window that occurs in offshore Arctic areas in summer or winter.

n: The through hole be opened at some section of the downhole casing,which be used to side track.