FIELD: oil, gas and coke-chemical industry.
SUBSTANCE: invention relates to oil and gas production, namely to downhole equipment. Disclosed is a system for hydraulic isolation of MSHF intervals along in-pipe space, which includes a soluble seat installed inside a coupling sleeve for hydraulic fracturing of the formation, and a corresponding soluble ball for closing the seat section. Soluble seat is made from soluble material with high corrosion rate and coated with protection consisting of at least one layer made of corrosion-resistant, abrasion-resistant and impact-resistant material, which is eliminated during interaction with corresponding soluble ball.
EFFECT: elimination of the risk of premature failure of seats due to provision of possibility to control moment of self-destruction process of soluble seats inside couplings of multi-stage hydraulic fracturing (MSHF).
1 cl, 5 dwg
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