The Pump Out Sub is used to circulate fluid from the drill string after the drill stem test has been completed, and the drill string is ready to be removed.
The tool consists of a short sub with one or more hollow pins screwed into the sides. These pins project into the sub bore during the course of a test. The tool can be configured with two shear pins, two rupture disks or one shear pin and one rupture disk, and as a Radioactive Marker Sub (RA Sub).
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