DEVICE FOR FLOW STRING PRESSURE-TESTING Russian patent published in 2006 - IPC E21B34/06 

FIELD: mining, particularly devices for flow string pressure-testing in wells.

SUBSTANCE: device comprises high-pressure testing valve, anchoring unit and sealing unit. Hollow body of pressure-testing valve includes movable and fixed parts to be inserted in sealing unit. Annular spacer is created on movable part of hollow body. Additional sealing means of seating mechanism is arranged from the first side of annular spacer. The additional sealing means is made as collar of L-shaped section having opened end facing high-pressure cavity and provided with limiting case. Main packing gland is installed from the second side of annular spacer. The main packing gland is brought into contact with fixed hollow body part, which may be located on anchoring unit seat. High-pressure testing valve is provided with unloading valve formed as kinematic pair including rod and piston and provided with sealed coupler. Device comprises fixing mechanism, which retains unloading valve in its opened position.

EFFECT: simplified structure and increased reliability.

5 dwg