Placed in tubing string to hold a column of fluid from draining back into the well formation.
The BT WJ consists of six components:
1. Fishneck 2. Shear Disc 3. Plunger 4. Cage 5. Packing Sub 6. Collet
BT WJ valves are generally placed in a well when there is a need for fluid to be retained in the wellbore and not to be reabsorbed back into the formation of a well, a good example of this would be above a submersible pump.
Install BT WJ Valve into desired jar down running tool and lower into wellbore to desired depth, jar packing into nipple and seat no-go, jar down to shear off and remove tool string from wellbore.
Install equalizing prong into desired jar up pulling tool and lower into wellbore to top of the BT WJ Valve and pierce the equalizing plunger, wait for tubing to equalize, pull from seal bore and remove tool string from the wellbore.
V – Packing