TFTV

Drill Stem Test tool. Flapper type (or flapper and open ports), allows tubing/string to self fill whilst running in hole, tubing/string can then be pressure tested internally as required. When tool is no longer required annulus pressure operated rupture disc is burst, shifting an organization-specific mandrel upwards that permanently opens the flapper and closes the ports. (the tool can be run with the ports plugged if required)