SHUT-OFF FACILITY OF WELL BOREHOLE Russian patent published in 2009 - IPC E21B43/00 

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil and gas production and is designed for shutting off boreholes of blowers and pressure wells from a producing reservoir without its killing. The shut-off facility consists of a case-cylinder, on a lower end of which there is secured a case with couplings-bushings on ends. A gate element is installed inside the case-cylinder; the gate element is made in form of a hollow plunger with a back valve and shaped slots in form of grooves on exterior surface. A radial channel is cut in the upper part of the case-cylinder. Two radial channels spaced at 180° one from another are made above the case in the lower part of the case-cylinder and the hollow plunger. A stop bushing is secured to the lower end of the hollow plunger; inside the stop bushing there is assembled a pipe led into the case. The stop bushing rests on a spring through a ball thrust bearing; the said spring is assembled outside the pipe in a hollow case. A holder governing a swivel of the hollow plunger fits in the groove of the shaped slot on external surface of the hollow plunger and is secured in the case-cylinder. Under pressure of a working agent from the well borehole the back valve shuts off the spring-loaded hollow plunger displacing it into a lower position and simultaneously swiveling it at 45°. When pressure in the well borehole drops, the spring returns the hollow plunger in its upper position, consequently, radial channels in the case and plunger are shut-off.

EFFECT: facilitating increased life of reliable operation, simplification of design and expanded functions.

2 dwg