FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry, in particular to ball systems of multi-stage hydraulic fracturing. Coupling for hydraulic fracturing consists of a housing with circulation holes. Bushing is installed inside the housing on shear pins, which closes the circulation holes until activation. Housing is made with possibility of connection at ends with upper and lower subs. Bushing is made with seat for activation element. Seat and activation element are soluble in well medium. Dissolution occurs only at direct physical contact of the seat with the activation element.
EFFECT: higher efficiency of hydraulic fracturing coupling.
5 cl, 1 dwg, 3 tbl
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