FIELD: mining.
SUBSTANCE: invention can be used for sealing a section of a well during interval hydraulic fracturing of a rock mass from it by injecting fluid under pressure. A device for hydraulic fracturing of rocks from a well consists of a body with a channel and a locking nut. Elastic sealing elements are installed on the body. A piston pair with sealing rings is placed between the sealing elements. The working chamber of the piston pair is in communication with the housing channel. Elastic sealing elements are combined with inserts made of softer material. A non-return valve is installed in the body channel. Behind the check valve, a radial hole is made in the body, which communicates with the radial hole in the piston through its groove.
EFFECT: increased efficiency of the device by increasing the degree of sealing of the well and eliminating the possibility of reducing the pressure in the piston pair during the transition of the device from sealing the well to hydraulic fracturing.
1 cl, 2 dwg
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RU2652407C1 |
