Description

The underbalancing disc assembly incorporate a 1" thick high strength glass disc which prevents communication between the tubing and the annulus.
It provides an underbalanced condition in the tubing above the zone to be perforated by running the tubing dry { +/- 100 ft of fluid above glass } or filled to the desired fluid level to get the needed underbalance.
Dropping the bar will shatter the disc, expose the wellbore and detonate the guns .