Annulus pressure operated test tools, catalog page 6
AP Flapper Pressure Test Valve
Rupture-disc operated flapper valve for repeated pressure testing while tripping in
Description
The AP FLAPPER pressure test valve is used to pressure test the working string repeatedly, as required, while the string is tripped in.
Features
- Shear pin holds the operating mandrel in the flapper-closed position while tripping in
- Operating mandrel is balanced against internal pressure and is not affected by the pressure in the string
- The working string can be pressure tested repeatedly while tripping in
- Once opened, the flapper cannot close again and the tool remains open
Operation
The operating pressure is usually set 1,000 psi above the hydrostatic column pressure; this is regarded as the first annulus pressure level. After the packer is set, annulus pressure is raised to the burst pressure of the rupture disc. The shear pin is sheared and the operating mandrel moves upward to open the flapper. Once open, the flapper cannot close and the tool always remains open.
