The tubing-fill test valve (TFTV) enables filling and testing of the tubing while running in the hole.
As the string is lowered into the hole, fluid enters the tubing through the TFTV bypass ports. The fluid creates a differential pressure that causes the flapper to open and then fills the tubing.
The tubing can be tested at any depth by pressuring-up on the tubing string against the flapper valve. When the test string is at depth, annulus pressure is applied to rupture a disk, causing the flapper to lock fully open. Once the flapper is open, the tool has fullbore access.
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