دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an accessory employed above a packer, to permit annulus-to-tubing circulation or vice versa.

a downhole valve in the treating string, operated by pressure pulsing or wireline that will allow the annulus to be circulated.

n: see circulation valve. unloading a well n: removing fluid from the tubing in a well, often by means of a swab, to lower the bottomhole pressure in the wellbore at the perforations and induce the well to flow.

n: a special circulation valve that provides a way of equalizing tubing and annulus pressure. See also circulation valve.