| 摘要 |
FIELD: oil-and-gas production. ^ SUBSTANCE: invention relates to mining and can be used for sealing the zone of the initiating crack during fluid- or hydraulic fracturing. The device has a hollow body with openings for the fracturing fluid, at the ends of which are attached elastic sealing elements, one of which is joined to a connecting pipe and the other - to a nosepiece. The hollow body is cup-shaped, is joined with its open part to a hollow bushing and has an end-to-end centre hole at its bottom. A hydraulically unbalanced slide valve with an end-to-end centre hole is mounted inside the body with possibility movement. One end of the slide valve is pressed by a working spring, placed inside the cup between the hollow bushing and the said slide valve, to an immovable seal at the bottom of the cup, and its opposite end is placed inside the said bushing. ^ EFFECT: increased efficiency of the device due increase of its carrying capacity and simplification of design. ^ 1 dwg |
