دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a partial restriction, generally a plate, placed to change the direction, guide the flow, or promote mixing within a tank or vessel. 2. a device that is seated on the bit pin, in a tool joint, or in a drill pipe float, to centralize the lower end of a go-devil while permitting the bypass of drilling fluid.

n: A replaceable metal ring inserted in the BHA (q.v.) to act as a landing collar for a survey tool.

n: A component installed near the bottom of the casing string on which the cement plugs land during the primary cementing operation. The internal components of the landing collar are generally fabricated from plastics, cement and other drillable materials.