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Placed in tubing string to hold a column of fluid from draining back into the well formation.
The WJ consists of seven components:
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 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 toolstring from wellbore.
Install equalizing prong into desired jar up pulling tool and lower into wellbore to top of the WJ Valve and pierce the equalizing plunger, wait for tubing to equalize, pull from sealbore and remove toolstring from the wellbore.