| 摘要 |
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 |
