FIELD: oil and gas industry.
SUBSTANCE: group of inventions is related to mining engineering and may be used for hydraulic fracturing of hydrocarbon formation. The downhole system comprises a variety of slip couplings having the central end-to-end channel. At that each of the slip couplings may be actuated by a single ball. Each slip coupling has a movable insert, which, depending on its position, may either block or provide radial flow of the fluid between the inner and outer parts of the coupling. The insert is shaped from the inner side of the movable insert thus ensuring connection of the pusher with insert and movement of the insert, which prevents passage of the fluid to inner part of the slip coupling.
EFFECT: improvement of hydraulic fracturing efficiency for several formations next by one wellbore.
21 cl, 11 dwg
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|
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|
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| METHOD AND DEVICE FOR CARRYING OUT MULTI-STAGE HYDRAULIC FRACTURING OF FORMATION | 2017 |
|
RU2668209C1 |
