BOREHOLE GATE Russian patent published in 2012 - IPC E21B34/06 

FIELD: oil and gas production.

SUBSTANCE: borehole gate consists of casing confined by collar bushing and seat to make the chamber accommodating bellow filled with compressed gas, shutoff valve arranged on its drive rod and coupled directly with bellow face making the shutoff valve reciprocating. Stepped bushing with diameter smaller than that of hole diameter is tightly secured on aforesaid casing. Opposed radial openings are arranged in casing and bushing walls to communicate the chamber with annular space. Adapter with radial openings is arranged above said casing to lower borehole gate into borehole and lift it there from. Stepped bushing is provided with adapter fitted in parker mounting adapter to separate well space above and under parker. Said adapter protects the gate against unexpected obstacles in tripping and eases its mounting at parker seat.

EFFECT: simplified design, reliable operation.

3 dwg