دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: the set of dense rubber. washer-shaped pieces encircling a packer. which are designed to expand against casing or formation face to seal off the annulus.

v: to pull off during a trip into or out of the hole because of pressure differential. For example, if a packer is run in too quickly, the pressure differential across the packer swabs off the packing elements, making it necessary to trip back out to replace them.

n: a packer whose packing elements are activated when weight from the tubing string is applied. To set some packers, rotation as well as weight is required. See packer.