Pressure test in ultraHPHT conditions

The tubing test valve (TTV) is a pressure test valve for ultraHPHT testing operations to enable pressure testing the tubing while running in the hole. The tubing can be tested at any depth by pressuring up on the tubing string, which means that no separate activation is required before pressure testing.

How it works

The TTV differs from the tubing-fill test valve (TFTV) in that it does not have flow ports and fill is automatic, via an open ID below the valve. When the test string is at depth, the TTV is opened by applying annulus pressure to rupture a disc. Hydrostatic pressure then moves the operator mandrel up against an atmospheric chamber, fully opening and covering the flapper valve. Once the flapper valve is open, the tool has an unrestricted ID.