دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. d1e fundamental unit of time in the metric system. 2. in some countries, the crew member who relieves the toolpusber, or rig manager, and is second in command. secondary cementing n: any cementing operation after the primary cementing operation. Secondary cementing includes a plug-back job, in which a plug of cement is positioned at a specific point in the well and allowed to set. Wells are plugged to shut off bottom water or to reduce the depth of the well for other reasons.